WO2011125958A1 - Polarizing laminate film, polarizing plate, and method for producing each - Google Patents
Polarizing laminate film, polarizing plate, and method for producing each Download PDFInfo
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- WO2011125958A1 WO2011125958A1 PCT/JP2011/058476 JP2011058476W WO2011125958A1 WO 2011125958 A1 WO2011125958 A1 WO 2011125958A1 JP 2011058476 W JP2011058476 W JP 2011058476W WO 2011125958 A1 WO2011125958 A1 WO 2011125958A1
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- film
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- resin
- polyvinyl alcohol
- polarizer layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133502—Antiglare, refractive index matching layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2329/00—Polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals
- B32B2329/04—Polyvinylalcohol
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/50—Protective arrangements
Definitions
- the present invention relates to a polarizing laminated film, a polarizing plate, and a method for producing them.
- the polarizing plate is widely used as a polarization supplying element in a display device such as a liquid crystal display device.
- a polarizing plate a polarizing film made of polyvinyl alcohol resin and a protective film made of triacetyl cellulose are conventionally used.
- mobile devices such as notebook personal computers and mobile phones for liquid crystal display devices have been used. With the development of equipment, etc., reduction in thickness and weight is required.
- a method for producing such a thin polarizing plate after providing a polyvinyl alcohol-based resin layer on the surface of the substrate film, stretching, and then dyeing to obtain a polarizing laminated film having a polarizer layer, A method has been proposed in which this is used as it is as a polarizing plate, or after a protective film is bonded to the polarizing laminate film, the substrate film is peeled off and used as a polarizing plate (for example, JP2000- 338329-A, JP2009-93074-A, JP2009-98653-A and JP2003-43257-A).
- the resin layer is coated by coating the aqueous solution of the polyvinyl alcohol-based resin directly on the surface of the base film.
- the contrast of the liquid crystal display device may not always be sufficient.
- an object of the present invention is to provide a thin polarizing plate capable of giving a good contrast ratio in a liquid crystal display device, a polarizing laminated film used therefor, and a method for producing them.
- the present inventor has obtained a polarizing plate obtained when a resin layer is formed using a general-purpose polyvinyl alcohol-based resin having a saponification degree exceeding 99.0 mol% in the conventional method.
- the polarization performance is not sufficient, and as a result, the present inventors have found that the contrast ratio of a liquid crystal display device using a polarizing plate is not always sufficient.
- the present invention includes the following.
- Polyvinyl alcohol comprising a base film and a polarizer layer formed on one surface of the base film, the polarizer layer having a thickness of 10 ⁇ m or less and adsorbed and oriented with a dichroic dye
- the saponification degree of the polyvinyl alcohol resin is 99.0 mol% or less
- the visibility corrected single transmittance (Ty) is 40% or more
- the visibility corrected polarization degree (Py) is 99.99%.
- Polarizing laminated film which is 9% or more.
- [3] is the polarizing laminated film according to [1] or [2] used for a polarizing plate.
- a polyvinyl alcohol resin comprising a protective film and a polarizer layer formed on one surface of the protective film, the polarizer layer having a thickness of 10 ⁇ m or less and adsorbed and oriented with a dichroic dye
- the saponification degree of the polyvinyl alcohol resin is 99.0 mol% or less
- the visibility corrected single transmittance (Ty) is 40% or more
- the visibility corrected polarization degree (Py) is 99.9%.
- the polarizing plate according to [5] wherein the polarizer layer is formed on one surface of the protective film via an adhesive layer or an adhesive layer.
- [8] The method for producing a polarizing laminated film according to any one of [1] to [4], wherein a polyvinyl alcohol type having a saponification degree of 99.0 mol% or less is formed on one surface of the base film.
- a polarizer layer is formed by dyeing with a dyeing step to obtain a polarizing laminated film, and a protective film is bonded to the surface of the polarizing laminated film opposite to the surface of the polarizer layer on the base film side
- the manufacturing method of the polarizing plate including the bonding process which obtains a multilayer film, and the peeling process which peels a base film from a multilayer film.
- the present invention it is possible to provide a thin polarizing plate capable of providing a display with a good contrast ratio in a liquid crystal display device and a polarizing laminated film used therefor.
- the resin layer which consists of a polyvinyl alcohol-type resin whose saponification degree is 99.0 mol% or less is formed in the surface of a base film, 5
- uniaxially stretching at a stretching ratio exceeding twice an effect that a good dyeing speed can be obtained in the subsequent dyeing step is exhibited.
- FIG. 1 is a schematic cross-sectional view showing an example of a basic layer configuration of a polarizing laminate film according to the present invention.
- the polarizing laminated film 10 includes a base film 11 and a polarizer layer 12 formed on one surface of the base film 11.
- the polarizer layer 12 has a thickness of 10 ⁇ m or less, and is formed from a polyvinyl alcohol resin in which a dichroic dye is adsorbed and oriented.
- the saponification degree of the polyvinyl alcohol-based resin is 99.0 mol% or less.
- the visibility corrected single transmittance (Ty) of the polarizing laminated film 10 is 40% or more, and the visibility corrected polarization degree (Py) is 99.9% or more.
- the polarizing laminated film 10 can be used as a polarizing plate. Since the polarizing laminated film 10 has the optical characteristics as described above, a display having a good contrast ratio can be obtained when the polarizing laminated film 10 is used as a polarizing plate of a liquid crystal display device.
- the visibility corrected single transmittance (Ty) is obtained in the wavelength range of 380 nm to 780 nm by obtaining the MD transmittance and the TD transmittance of the polarizing laminated film or the polarizing plate, and based on the formula (1) shown below. It can be obtained by calculating the single transmittance at the wavelength and further correcting the visibility with the 2 degree visual field (C light source) of JIS Z 8701.
- the visibility correction polarization degree (Py) is obtained by calculating MD transmittance and TD transmittance in the same manner as described above, and calculating the degree of polarization (%) at each wavelength based on the following formula (2). Can be obtained by correcting the visibility.
- MD transmittance is the transmittance when the direction of polarized light emitted from the Glan-Thompson prism is parallel to the transmission axis of the polarizing plate sample, and is expressed as “MD” in the equations (1) and (2).
- the “TD transmittance” is the transmittance when the direction of polarized light emitted from the Glan-Thompson prism and the polarizing plate sample are orthogonal to the transmission axis. In the formulas (1) and (2), “TD”. It expresses. Both MD transmittance and TD transmittance can be measured with a spectrophotometer with an integrating sphere.
- Single transmittance (%) (MD + TD) / 2 Formula (1)
- Degree of polarization (%) ⁇ ⁇ (MD ⁇ TD) / (MD + TD) ⁇ ⁇ 100 (2)
- each component will be described in detail.
- a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, stretchability and the like is used as a material of the base film 11 used in the present invention.
- thermoplastic resins include cellulose ester resins such as cellulose triacetate, polyester resins, polyether sulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins. , (Meth) acrylic resins, cyclic polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
- the material for the base film preferably includes at least one selected from the group consisting of cellulose ester resins, polyolefin resins, cyclic polyolefin resins, and (meth) acrylic resins.
- the cellulose ester resin is an ester of cellulose and a fatty acid.
- Specific examples of the cellulose ester resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate. Among these, cellulose triacetate is particularly preferable. Many products of cellulose triacetate are commercially available, which is advantageous in terms of availability and cost.
- Examples of commercially available cellulose triacetate include Fujitac (registered trademark) TD80 (manufactured by Fuji Film Co., Ltd.), Fujitac (registered trademark) TD80UF (manufactured by Fuji Film Co., Ltd.), Fujitac (registered trademark) TD80UZ (Fuji Film ( Co., Ltd.), Fujitac (registered trademark) TD40UZ (Fuji Film Co., Ltd.), KC8UX2M (Konica Minolta Opto Co., Ltd.), KC4UY (Konica Minolta Opto Co., Ltd.), and the like.
- polystyrene resin examples include polyethylene and polypropylene.
- a base film made of polypropylene it is preferable because it can be stably stretched at a high magnification.
- cyclic polyolefin resin a norbornene resin is preferably used.
- the cyclic polyolefin-based resin is a general term for resins that are polymerized using a cyclic olefin as a polymerization unit, and examples thereof include resins described in JPH01-240517-A, JPH03-14882-A, JPH03-122137-A, and the like. .
- ring-opening (co) polymers of cyclic olefins include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, cyclic olefins and ⁇ -olefins such as ethylene and propylene (typically random copolymers), And graft polymers obtained by modifying them with an unsaturated carboxylic acid or a derivative thereof, and hydrides thereof.
- cyclic olefin include norbornene monomers.
- cyclic polyolefin resins Various products are commercially available as cyclic polyolefin resins. Specific examples include Topas (registered trademark) (manufactured by Ticona), Arton (registered trademark) (manufactured by JSR Corporation), ZEONOR (registered trademark) (manufactured by ZEON Corporation), ZEONEX (ZEONEX). (Registered trademark) (manufactured by ZEON CORPORATION) and Apel (registered trademark) (manufactured by Mitsui Chemicals, Inc.).
- Topas registered trademark
- Arton registered trademark
- ZEONOR registered trademark
- ZEON ZEON Corporation
- ZEONEX ZEONEX
- Apel registered trademark
- any appropriate (meth) acrylic resin can be adopted as the (meth) acrylic resin.
- poly (meth) acrylic acid ester such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester -(Meth) acrylic acid copolymer, (meth) acrylic acid methyl-styrene copolymer (MS resin, etc.), polymer having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer) And methyl methacrylate- (meth) acrylate norbornyl copolymer).
- poly (meth) acrylic acid ester such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-
- C1-6 alkyl poly (meth) acrylates such as poly (meth) acrylate methyl
- the (meth) acrylic resin is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).
- any appropriate additive may be added to the base film 11 in addition to the above thermoplastic resin.
- additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, anti-coloring agents, flame retardants, nucleating agents, antistatic agents, pigments, and coloring agents.
- the content of the thermoplastic resin exemplified above in the base film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, and particularly preferably 70 to 97%. % By weight. If the content of the thermoplastic resin in the base film is less than 50% by weight, the high transparency inherent in the thermoplastic resin may not be sufficiently exhibited.
- the thickness of the base film 11 can be determined as appropriate, it is generally preferably 1 to 500 ⁇ m, more preferably 1 to 300 ⁇ m, and even more preferably 5 to 200 ⁇ m from the viewpoint of workability such as strength and handleability.
- the thickness of the base film 11 is most preferably 5 to 150 ⁇ m.
- the base film 11 may be subjected to corona treatment, plasma treatment, flame treatment or the like on at least the surface on which the polarizer layer 12 is formed in order to improve the adhesion with the polarizer layer 12. Moreover, in order to improve adhesiveness, you may form thin layers, such as a primer layer, in the surface at the side in which the polarizer layer 12 of the base film 11 is formed.
- the polarizer layer 12 is obtained by adsorbing and orienting a dichroic dye on a uniaxially stretched polyvinyl alcohol-based resin layer.
- a saponified polyvinyl acetate resin can be used as the polyvinyl alcohol resin.
- the polyvinyl acetate resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers with other monomers copolymerizable with vinyl acetate.
- examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
- the saponification degree of the polyvinyl alcohol resin is 99.0 mol% or less.
- the reason why a polyvinyl alcohol resin having a saponification degree of 99.0 mol% or less is used is that a constant dyeing speed can be maintained even when uniaxial stretching is performed more than 5 times. There is an advantage that a thin polarizing laminated film having high polarizing performance can be efficiently produced.
- the dyeing speed is remarkably slow, and a polarizing laminated film having sufficient polarization performance may not be obtained. In some cases, the production takes several times longer than usual.
- the saponification degree of the polyvinyl alcohol-based resin is preferably 90 mol% or more, and more preferably 94 mol% or more. If the saponification degree is less than 90 mol%, strength such as water resistance may not be sufficient.
- the saponification degree as used herein is a unit ratio (mol%) representing the ratio of the acetate group contained in the polyvinyl acetate resin, which is a raw material for the polyvinyl alcohol resin, to a hydroxyl group by the saponification step. Is a numerical value defined by the following formula. It can be obtained by the method defined in JIS K 6726 (1994).
- Saponification degree (mol%) (number of hydroxyl groups) ⁇ (number of hydroxyl groups + number of acetate groups) ⁇ 100 The higher the degree of saponification, the higher the proportion of hydroxyl groups, that is, the lower the proportion of acetate groups that inhibit crystallization.
- the polyvinyl alcohol resin used in the present invention is not particularly limited as long as the saponification degree is 99.0 mol% or less, and may be modified polyvinyl alcohol partially modified.
- polyvinyl alcohol-based resins modified with olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, alkyl esters of unsaturated carboxylic acids, acrylamide, etc.
- the average degree of polymerization of the polyvinyl alcohol-based resin is not particularly limited, but is preferably 100 to 10,000, and more preferably 1500 to 10,000.
- polyvinyl alcohol resin having such characteristics examples include PVA124 (degree of saponification: 98.0 to 99.0 mol%) and PVA117 (degree of saponification: 98.0 to 99.0) manufactured by Kuraray Co., Ltd. Mol%), PVA624 (degree of saponification: 95.0 to 96.0 mol%) and PVA617 (degree of saponification: 94.5 to 95.5 mol%); for example, AH- manufactured by Nippon Synthetic Chemical Industry Co., Ltd. 26 (saponification degree: 97.0 to 98.8 mol%), AH-22 (degree of saponification: 97.5 to 98.5 mol%), NH-18 (degree of saponification: 98.0 to 99.99%).
- a film obtained by forming such a polyvinyl alcohol-based resin constitutes the polarizer layer 12 according to the present invention.
- the method for forming the polyvinyl alcohol-based resin is not particularly limited, and can be formed by a known method, but from the viewpoint that it is easy to obtain the polarizer layer 12 having a desired thickness. It is preferable to form a film by applying a resin solution onto the base film 11.
- the polarizer layer 12 is preferably uniaxially stretched at a stretch ratio of more than 5 times, more preferably more than 5 times and not more than 17 times.
- the polarizer layer 12 has a dichroic dye adsorbed and oriented on the polyvinyl alcohol resin as described above.
- the thickness of the polarizer layer 12 is 10 ⁇ m or less, preferably 7 ⁇ m or less. By setting the thickness of the polarizer layer 12 to 10 ⁇ m or less, a thin polarizing laminated film can be configured.
- FIG. 2 is a schematic cross-sectional view showing an example of a basic layer configuration of the polarizing plate according to the present invention.
- the polarizing plate 13 includes a protective film 14 and a polarizer layer 12 formed on one surface of the protective film 14.
- the polarizer layer 12 has a thickness of 10 ⁇ m or less, and is formed from a polyvinyl alcohol resin in which a dichroic dye is adsorbed and oriented.
- the saponification degree of the polyvinyl alcohol-based resin is 99.0 mol% or less.
- the visibility corrected single transmittance (Ty) of the polarizing plate 13 is 40% or more, and the visibility corrected polarization degree (Py) is 99.9% or more.
- the polarizing plate 13 can be used as a polarizing plate of a liquid crystal display device. Since the polarizing plate 13 has the optical characteristics as described above, when the polarizing plate 13 is used as a polarizing plate of a liquid crystal display device, a display with a good contrast ratio can be obtained.
- the protective film 14 and the polarizer layer 12 are bonded via, for example, a pressure-sensitive adhesive layer or an adhesive layer not explicitly shown in FIG. 3.
- a pressure-sensitive adhesive layer or an adhesive layer not explicitly shown in FIG. 3.
- the protective film 14 may be a simple protective film having no optical function, or may be a protective film having an optical function such as a retardation film or a brightness enhancement film.
- the material of the protective film 14 is not particularly limited, but for example, a cyclic polyolefin resin film, a cellulose acetate resin film made of a resin such as triacetyl cellulose or diacetyl cellulose, polyethylene terephthalate, polyethylene naphthalate, Examples thereof include films that have been widely used in the art, such as polyester resin films, polycarbonate resin films, acrylic resin films, and polypropylene resin films made of a resin such as polybutylene terephthalate.
- cyclic polyolefin-based resin examples include appropriate commercial products such as Topas (registered trademark) (manufactured by Ticona), Arton (registered trademark) (manufactured by JSR Corporation), ZEONOR (registered trademark) (Nippon ZEON ( ZEONEX (registered trademark) (manufactured by Nippon Zeon Co., Ltd.), Apel (registered trademark) (manufactured by Mitsui Chemicals, Inc.) can be suitably used.
- Topas registered trademark
- Arton registered trademark
- ZEONOR registered trademark
- Nippon ZEON ZEONEX
- Apel registered trademark
- Mitsui Chemicals, Inc. a known method such as a solvent casting method or a melt extrusion method is appropriately used.
- cyclic polyolefins such as Essina (registered trademark) (manufactured by Sekisui Chemical Co., Ltd.), SCA40 (manufactured by Sekisui Chemical Co., Ltd.), ZEONOR (registered trademark) film (manufactured by Optes Co., Ltd.), etc.
- Essina registered trademark
- SCA40 manufactured by Sekisui Chemical Co., Ltd.
- ZEONOR registered trademark film
- a commercial product of a film made of a resin may be used.
- the cyclic polyolefin resin film may be uniaxially stretched or biaxially stretched.
- An arbitrary retardation value can be imparted to the cyclic polyolefin-based resin film by stretching. Stretching is usually performed continuously while unwinding the film roll, and is stretched in the heating furnace in the roll traveling direction, the direction perpendicular to the traveling direction, or both.
- the temperature of the heating furnace is usually in the range from the vicinity of the glass transition temperature of the cyclic polyolefin resin to the glass transition temperature + 100 ° C.
- the stretching ratio is usually 1.1 to 6 times, preferably 1.1 to 3.5 times in one direction.
- the cyclic polyolefin resin film generally has poor surface activity
- surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, saponification treatment is performed on the surface to be bonded to the polarizing film.
- plasma treatment and corona treatment that can be performed relatively easily are preferable.
- Examples of the cellulose acetate-based resin film include commercially available products such as Fujitac (registered trademark) TD80 (manufactured by Fuji Film Co., Ltd.), Fujitac (registered trademark) TD80UF (manufactured by Fuji Film Co., Ltd.), and Fujitac (registered trademark).
- TD80UZ Fluji Film Co., Ltd.
- Fujitac registered trademark
- TD40UZ Fujiji Film Co., Ltd.
- KC8UX2M Konica Minolta Opto Co., Ltd.
- KC4UY Konica Minolta Opto Co., Ltd.
- a liquid crystal layer or the like may be formed on the surface of the cellulose acetate-based resin film in order to improve viewing angle characteristics. Moreover, in order to provide a phase difference, what stretched the cellulose acetate type-resin film may be used.
- the cellulose acetate-based resin film is usually subjected to a saponification treatment in order to improve the adhesiveness with the polarizing film.
- a saponification treatment a method of immersing in an alkaline aqueous solution such as sodium hydroxide or potassium hydroxide can be employed.
- An optical layer such as a hard coat layer, an antiglare layer, or an antireflection layer can be formed on the surface of the protective film 14 as described above.
- the method for forming these optical layers on the surface of the protective film is not particularly limited, and a known method can be used.
- the thickness of the protective film 14 is preferably as thin as possible from the demand for thinning, is preferably 88 ⁇ m or less, and more preferably 48 ⁇ m or less. On the other hand, if it is too thin, the strength is lowered and the processability is poor, and therefore it is preferably 5 ⁇ m or more.
- the polarizer layer 12 can be configured similarly to the polarizer layer 12 of the above-described polarizing laminated film 10.
- the pressure-sensitive adhesive used for bonding the protective film 14 and the polarizer layer 12 usually uses an acrylic resin, a styrene resin, a silicone resin, or the like as a base polymer, and there are an isocyanate compound, an epoxy compound, an aziridine compound, and the like.
- the thickness of the pressure-sensitive adhesive layer is preferably 1 to 40 ⁇ m, but it is preferably applied thinly, and more preferably 3 to 25 ⁇ m, as long as the workability and durability characteristics are not impaired.
- the thickness is from 3 to 25 ⁇ m, it has good processability and is also suitable for suppressing the dimensional change of the polarizing film.
- the pressure-sensitive adhesive layer is less than 1 ⁇ m, the tackiness is lowered, and when it exceeds 40 ⁇ m, problems such as the pressure-sensitive adhesive protruding easily occur.
- the pressure-sensitive adhesive layer may be bonded to the polarizer layer 12 after providing the pressure-sensitive adhesive layer on the surface of the protective film 14. After providing the pressure-sensitive adhesive layer on the surface, the protective film 14 may be bonded thereto.
- the method for forming the pressure-sensitive adhesive layer is not particularly limited, and a solution containing each component including the above-mentioned base polymer is applied to the surface of the protective film 14 or the surface of the polarizer layer 12 and dried to adhere.
- the protective film 14 and the polarizer layer 12 may be bonded together, or after forming the pressure-sensitive adhesive layer on the separator, it is transferred to the surface of the protective film 14 or the surface of the polarizer layer 12 and laminated. May be.
- the pressure-sensitive adhesive layer is formed on the surface of the protective film 14 or the polarizer layer 12, if necessary, an adhesion treatment is applied to one or both of the surface of the protective film 14 or the polarizer layer 12, or the pressure-sensitive adhesive layer, for example, corona. You may perform a process etc.
- Examples of the adhesive used for bonding the protective film 14 and the polarizer layer 12 include an aqueous adhesive using a polyvinyl alcohol-based resin aqueous solution, an aqueous two-component urethane emulsion adhesive, and the like.
- a polyvinyl alcohol resin aqueous solution is suitably used as an aqueous adhesive for bonding to the polarizer layer 12.
- Polyvinyl alcohol resins used as adhesives include vinyl alcohol homopolymers obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, as well as other single quantities copolymerizable with vinyl acetate. And vinyl alcohol copolymers obtained by saponifying the copolymer with the polymer, and modified polyvinyl alcohol polymers obtained by partially modifying the hydroxyl groups.
- a polyhydric aldehyde, a water-soluble epoxy compound, a melamine compound, a zirconia compound, a zinc compound, or the like may be added as an additive to the water-based adhesive.
- the adhesive layer obtained therefrom is usually 1 ⁇ m or less, and even when the cross section is observed with a normal optical microscope, the adhesive layer is practically not observed.
- the method of bonding the polarizer layer 12 and the protective film 14 using an aqueous adhesive is not particularly limited.
- the adhesive is uniformly applied to the surface of the polarizer layer 12 and / or the protective film 14.
- the other film is stacked on the coated surface, pressed with a roll or the like, and dried.
- the adhesive is applied at a temperature of 15 to 40 ° C., and the bonding temperature is usually in the range of 15 to 30 ° C.
- the polarizer layer 12 and the protective film 14 are bonded together and then dried to remove water contained in the water-based adhesive.
- the temperature of the drying furnace is preferably 30 ° C to 90 ° C. When the temperature is lower than 30 ° C., the adhesive surface between the polarizer layer 12 and the protective film 14 tends to be easily peeled off. If it is 90 ° C. or higher, the optical performance may be deteriorated by heat.
- the drying time can be 10 to 1000 seconds, and preferably 60 to 750 seconds, more preferably 150 to 600 seconds, particularly from the viewpoint of productivity.
- the temperature at the time of curing is generally set lower than the temperature adopted at the time of drying.
- a photo-curable adhesive can be used as an adhesive when the polarizer layer 12 and the protective film 14 are bonded.
- the photocurable adhesive include a mixture of a photocurable epoxy resin and a photocationic polymerization initiator.
- a method of bonding the polarizer layer 12 and the protective film 14 with a photocurable adhesive a conventionally known method can be used.
- a casting method, a Mayer bar coating method, a gravure coating method, a comma coater examples thereof include a method in which an adhesive is applied to the adhesive surface of the polarizer layer 12 and / or the protective film 14 by a method, a doctor plate method, a die coating method, a dip coating method, a spraying method, and the like, and the both are overlapped.
- the polarizer layer 12 or the protective film 14 which is an object to be coated is moved in a substantially vertical direction, a substantially horizontal direction, or an oblique direction between the two, and the adhesive is allowed to flow down on the surface. This is a method of spreading.
- the polarizer layer 12 and the protective film 14 are bonded together by sandwiching them with a nip roll or the like through the adhesive application surface. Moreover, after dripping an adhesive agent between the polarizer layer 12 and the protective film 14 in a state where the polarizer layer 12 and the protective film 14 are overlapped, the laminate is pressed with a roll or the like and uniformly spread.
- the method can also be preferably used. In this case, a metal, rubber, or the like can be used as the material of the roll. Further, a method in which an adhesive is dropped between the polarizer layer 12 and the protective film 14 and then the laminate is passed between the rolls and then pressed and spread is preferably employed. In this case, these rolls may be made of the same material or different materials.
- the thickness of the adhesive layer after being bonded using the nip roll or the like before drying or curing is preferably 5 ⁇ m or less and 0.01 ⁇ m or more.
- the surface of the polarizer layer 12 and / or the protective film 14 is appropriately subjected to surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, saponification treatment, and the like. May be.
- surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, saponification treatment, and the like.
- the saponification treatment include a method of immersing in an aqueous alkali solution such as sodium hydroxide or potassium hydroxide.
- the photocurable adhesive is cured by irradiating active energy rays after the polarizer layer 12 and the protective film 14 are joined.
- the light source of the active energy ray is not particularly limited, but an active energy ray having a light emission distribution at a wavelength of 400 nm or less is preferable.
- the low pressure mercury lamp, the medium pressure mercury lamp, the high pressure mercury lamp, the ultrahigh pressure mercury lamp, the chemical lamp, and the black light lamp A microwave excitation mercury lamp, a metal halide lamp and the like are preferably used.
- the light irradiation intensity to the photocurable adhesive is appropriately determined depending on the composition of the photocurable adhesive and is not particularly limited, but the irradiation intensity in the wavelength region effective for activating the polymerization initiator is 0.1 to 6000 mW / it is preferable that the cm 2.
- the irradiation intensity is 0.1 mW / cm 2 or more, the reaction time does not become too long, and when it is 6000 mW / cm 2 or less, the epoxy is generated by the heat radiated from the light source and the heat generated when the photo-curable adhesive is cured. There is little risk of yellowing of the resin or deterioration of the polarizing film.
- the light irradiation time to the photocurable adhesive is not particularly limited and is applied according to the photocurable adhesive to be cured, but the integrated light amount expressed as the product of the irradiation intensity and the irradiation time. Is preferably set to 10 to 10,000 mJ / cm 2 . When the cumulative amount of light to the photocurable adhesive is 10 mJ / cm 2 or more, a sufficient amount of active species derived from the polymerization initiator can be generated to allow the curing reaction to proceed more reliably, and at 10,000 mJ / cm 2 or less. In some cases, the irradiation time does not become too long and good productivity can be maintained.
- the thickness of the adhesive layer after irradiation with active energy rays is usually about 0.001 to 5 ⁇ m, preferably 0.01 ⁇ m or more and 2 ⁇ m or less, more preferably 0.01 ⁇ m or more and 1 ⁇ m or less.
- the curing is performed under conditions that do not deteriorate the functions of the polarizing plate such as the degree of polarization of the polarizer layer 12, the transmittance and the hue, and the transparency of the protective film 14. Preferably it is done.
- the polarizing plate of the present invention produced as described above can be used as a polarizing plate in which other optical layers are laminated in practical use.
- the said protective film 14 may have a function of these optical layers.
- other optical layers include a reflective polarizing film that transmits certain types of polarized light and reflects polarized light that exhibits the opposite properties, a film with an antiglare function having an uneven shape on the surface, and a surface antireflection function. Examples thereof include an attached film, a reflective film having a reflective function on the surface, a transflective film having both a reflective function and a transmissive function, and a viewing angle compensation film.
- the viewing angle compensation film examples include an optical compensation film coated with a liquid crystal compound on the surface of the substrate and oriented, a retardation film made of a polycarbonate resin, and a retardation film made of a cyclic polyolefin resin.
- WV film Fluji Film Co., Ltd.
- NH film Tin Nippon Oil Co., Ltd.
- NR Examples include films (manufactured by Nippon Oil Corporation).
- Commercial products corresponding to retardation films made of cyclic polyolefin resins include Arton (registered trademark) film (manufactured by JSR Corporation), Essina (registered trademark) (manufactured by Sekisui Chemical Co., Ltd.), Zeonor ( Registered trademark) film (manufactured by Optes Co., Ltd.).
- FIG. 3 is a flowchart showing an embodiment of a method for producing the polarizing laminated film 10 shown in FIG.
- the manufacturing method of the light-polarizing laminated film 10 forms the resin film which consists of a polyvinyl alcohol-type resin whose saponification degree is 99.0 mol% or less on one surface of the base film 11, and is a laminated film.
- the dyeing step (S30) for obtaining the polarizing laminated film 10 as the polarizer layer 12 is performed in this order.
- the resin layer forming step (S10), the stretching step (S20), and the dyeing step (S30) are the same as the corresponding steps in the polarizing plate manufacturing method described later.
- the laminated film obtained by this production method becomes the polarizing laminated film 10 provided with the polarizer layer 12 having a thickness of 10 ⁇ m or less on the stretched base film 11.
- This can be used as a polarizing plate as it is, or as an intermediate product for transferring the polarizer layer 12 to a protective film as described later.
- FIG. 4 is a flowchart showing an embodiment of a method for manufacturing the polarizing plate 13 shown in FIG. According to this, the polarizing plate 13 is manufactured by forming a resin layer made of a polyvinyl alcohol resin having a saponification degree of 99.0 mol% or less on one surface of the base film to obtain a laminated film.
- the protective film 14 is bonded to the surface of the polarizer layer 12 of the polarizing laminated film opposite to the surface of the base film 11 side, and the multilayer film A bonding step (S40) for obtaining a film, and a peeling step (S50) for peeling the base film 11 from the multilayer film are provided in this order.
- the polarizing plate 13 obtained by this manufacturing method becomes the polarizing plate 13 provided with the polarizer layer 12 having a thickness of 10 ⁇ m or less on the protective film 14.
- the polarizing plate 13 can be used, for example, by being bonded to another optical film or a liquid crystal cell via a pressure-sensitive adhesive.
- the material suitable for the base film is as described in the description of the configuration of the polarizing laminated film.
- those having a melting point of 130 ° C. or higher are used. If the melting point of the base film is less than 110 ° C., the base film is likely to melt in the stretching step (S20) described later, and the stretching temperature cannot be raised sufficiently, making stretching more than 5 times difficult. It is.
- the melting point of the base film is a value measured at a heating rate of 10 ° C./min based on ISO3146.
- the material of the polyvinyl alcohol resin suitable for forming the resin layer is as described in the explanation of the configuration of the polarizing laminated film.
- the thickness of the resin layer to be formed is preferably more than 3 ⁇ m and not more than 30 ⁇ m, more preferably 5 to 20 ⁇ m. If it is 3 ⁇ m or less, it becomes too thin after stretching and the dyeability is remarkably deteriorated. If it exceeds 30 ⁇ m, the thickness of the finally obtained polarizer layer may exceed 10 ⁇ m, which is not preferable.
- the resin layer is preferably formed by applying a polyvinyl alcohol resin solution obtained by dissolving polyvinyl alcohol resin powder in a good solvent onto one surface of the base film, and evaporating the solvent to dry the resin layer. It is formed. By forming the resin layer in this way, it can be formed thin.
- a method for coating a polyvinyl alcohol resin solution on a base film a wire bar coating method, a reverse coating, a roll coating method such as gravure coating, a die coating method, a comma coating method, a lip coating method, a spin coating method, a screen coating method.
- a method, a fountain coating method, a dipping method, a spray method, and the like can be appropriately selected from known methods and employed.
- the drying temperature is, for example, 50 to 200 ° C., preferably 60 to 150 ° C.
- the drying time is, for example, 2 to 20 minutes.
- the resin layer in this embodiment can also be formed by sticking a raw film made of a polyvinyl alcohol resin on one surface of the base film.
- a primer layer may be provided between the base film and the resin layer in order to improve the adhesion between the base film and the polyvinyl alcohol resin.
- the primer layer is preferably formed from a composition containing a crosslinking agent or the like in a polyvinyl alcohol resin from the viewpoint of adhesion.
- a laminated film composed of a base film and a resin layer is uniaxially stretched so as to have a draw ratio of more than 5 times with respect to the original length of the laminated film to obtain a stretched film.
- uniaxial stretching is performed so that the stretching ratio is more than 5 times and not more than 17 times. More preferably, it is uniaxially stretched so that the stretch ratio is more than 5 times and not more than 8 times.
- the draw ratio is 5 times or less, the resin layer made of the polyvinyl alcohol resin is not sufficiently oriented, and as a result, the degree of polarization of the polarizer layer is not sufficiently high.
- the stretching process in the stretching step (S20) is not limited to one-stage stretching, and can be performed in multiple stages. In the case of performing in multiple stages, the stretching process is performed so that the stretching ratio is more than 5 times by combining all stages of the stretching process.
- a longitudinal stretching process performed in the longitudinal direction of the laminated film is preferable.
- a fixed end represented by transverse uniaxial stretching by the tenter method or the like.
- Uniaxial stretching may be used.
- the longitudinal stretching method include an inter-roll stretching method, a compression stretching method, and a stretching method using a tenter.
- the stretching process is not limited to the longitudinal stretching process, and may be an oblique stretching process or the like. Moreover, it is preferable that it is free end uniaxial stretching.
- the stretching treatment either a wet stretching method or a dry stretching method can be adopted, but the use of the dry stretching method is preferable in that the temperature for stretching the laminated film can be selected from a wide range.
- the stretching treatment in a temperature range of ⁇ 30 ° C. to + 5 ° C. of the melting point of the base film. More preferably, the stretching process is performed in the temperature range from ⁇ 25 ° C. to the melting point of the base film.
- the stretching temperature is lower than the melting point of the base film 11 of ⁇ 30 ° C., it becomes difficult to stretch the film at a high magnification exceeding 5 times.
- the stretching temperature exceeds + 5 ° C. of the melting point of the base film, it is not preferable because stretching becomes difficult due to melting of the base film.
- stretching temperature is in the said range, More preferably, it is 120 degreeC or more. This is because when the stretching temperature is 120 ° C. or higher, there is no difficulty in the stretching treatment even at a high stretching ratio of more than 5 times.
- the temperature adjustment of the stretching process is usually based on the temperature adjustment of the heating furnace.
- the resin layer of the stretched film is dyed with a dichroic dye.
- the dichroic dye include iodine and organic dyes.
- organic dyes include Red BR, Red LR, Red R, Pink LB, Rubin BL, Bordeaux GS, Sky Blue LG, Lemon Yellow, Blue BR, Blue 2R, Navy RY, Green LG, Violet LB, Violet B, Black H, Black B, Black GSP, Yellow 3G, Yellow R, Orange LR, Orange 3R, Scarlet GL, Scarlet KGL, Congo Red, Brilliant Violet BK, Spura Blue G, Spura Blue GL, Spura Orange GL, Direct Sky Blue, Direct First Orange S, First Black, etc. can be used.
- One kind of these dichroic substances may be used, or two or more kinds may be used in combination.
- the dyeing step is performed, for example, by immersing the entire stretched film in a solution (dye solution) containing the dichroic dye.
- a solution in which the above dichroic dye is dissolved in a solvent can be used.
- a solvent for the dyeing solution water is generally used, but an organic solvent compatible with water may be further added.
- the concentration of the dichroic dye is preferably 0.01 to 10% by weight, more preferably 0.02 to 7% by weight, and particularly preferably 0.025 to 5% by weight.
- iodine When iodine is used as the dichroic dye, it is preferable to further add an iodide because the dyeing efficiency can be further improved.
- the iodide include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, and iodide.
- examples include titanium.
- the addition ratio of these iodides is preferably 0.01 to 10% by weight in the dyeing solution.
- the ratio of iodine to potassium iodide is preferably in the range of 1: 5 to 1: 100, more preferably in the range of 1: 6 to 1:80 by weight. And particularly preferably in the range of 1: 7 to 1:70.
- the immersion time of the stretched film in the dyeing solution is not particularly limited, but is usually preferably in the range of 15 seconds to 15 minutes, and more preferably 1 minute to 3 minutes.
- the temperature of the dyeing solution is preferably in the range of 10 to 60 ° C., more preferably in the range of 20 to 40 ° C.
- a crosslinking treatment can be performed after dyeing.
- the crosslinking treatment can be performed, for example, by immersing the stretched film in a solution containing a crosslinking agent (crosslinking solution).
- crosslinking solution Conventionally known substances can be used as the crosslinking agent. Examples thereof include boron compounds such as boric acid and borax, glyoxal, and glutaraldehyde. One kind of these may be used, or two or more kinds may be used in combination.
- crosslinking solution a solution in which a crosslinking agent is dissolved in a solvent can be used.
- solvent for example, water can be used, but an organic solvent compatible with water may be further included.
- concentration of the crosslinking agent in the crosslinking solution is not limited to this, but is preferably in the range of 1 to 20% by weight, more preferably 6 to 15% by weight.
- An iodide may be added to the crosslinking solution. By adding iodide, the in-plane polarization characteristics of the resin layer can be made more uniform.
- the iodide include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, and titanium iodide. Is mentioned.
- the iodide content is 0.05 to 15% by weight, more preferably 0.5 to 8% by weight.
- the immersion time of the stretched film in the crosslinking solution is usually preferably from 15 seconds to 20 minutes, and more preferably from 30 seconds to 15 minutes.
- the temperature of the crosslinking solution is preferably in the range of 10 to 80 ° C.
- a washing step a water washing treatment can be performed.
- the water washing treatment can usually be performed by immersing the stretched film in pure water such as ion exchange water or distilled water.
- the water washing temperature is usually in the range of 3 to 50 ° C., preferably 4 to 20 ° C.
- the immersion time is usually 2 to 300 seconds, preferably 3 to 240 seconds.
- washing treatment with an iodide solution and water washing treatment may be combined, and a solution in which liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol, propanol or the like is appropriately blended may be used.
- liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol, propanol or the like is appropriately blended
- the resin layer has a function as a polarizer.
- the resin layer which has a function as a polarizer is called a polarizer layer, and the laminated body provided with the polarizer layer on the base film is called a polarizing laminated film.
- a polyvinyl alcohol resin having a saponification degree of 99.0 mol% or less is used for the resin layer, and uniaxial stretching is performed at a stretching ratio of more than 5 times in the stretching step (S20). Therefore, a good dyeing speed is maintained in the dyeing step (S30).
- the resin layer using the polyvinyl alcohol-type resin with a high saponification degree has a low dyeing speed in the dyeing step (S30), and the dyeing tends to be insufficient.
- a protective film is bonded to the surface opposite to the surface on the base film side of the polarizer layer in the polarizing laminated film to obtain a multilayer film.
- a method of bonding a protective film the method of bonding the polarizer layer 12 and the protective film 14 with an adhesive, and the method of bonding the polarizer layer 12 surface and the protective film 14 with an adhesive are mentioned.
- Materials suitable as the protective film are as described in the description of the structure of the polarizing plate.
- the preferable method of bonding the polarizer layer 12 and the protective film 14 using the adhesive suitable for use, the material of an adhesive, and these is as having demonstrated by description of the structure of the above-mentioned polarizing plate.
- a peeling process (S50) is performed after the bonding process (S40) which bonds a protective film to the polarizer layer 12 of a polarizing laminated film.
- a peeling process (S50) a base film is peeled from a multilayer film.
- the peeling method of a base film is not specifically limited, It can peel by the method similar to the peeling process of the peeling film performed with a normal polarizing plate with an adhesive.
- the protective film may be peeled off as it is, or once wound up in a roll shape, a separate peeling step may be provided and peeled off.
- Example 1 The polarizing plate shown in FIG. 2 was produced according to the manufacturing method shown in FIG.
- Base film An unstretched polypropylene (PP) film (melting point: 163 ° C.) having a thickness of 110 ⁇ m was used as the base film.
- Polyvinyl alcohol powder (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average polymerization degree 1100, saponification degree 99.5 mol%, trade name: Z-200) is dissolved in 95 ° C. hot water to give an aqueous solution having a concentration of 3% by weight. Prepared. The resulting aqueous solution was mixed with 5 parts by weight of a crosslinking agent (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650) with respect to 6 parts by weight of polyvinyl alcohol powder. The obtained mixed aqueous solution was applied on a corona-treated substrate film using a microgravure coater and dried at 80 ° C. for 10 minutes to form a primer layer having a thickness of 0.2 ⁇ m.
- a crosslinking agent manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650
- the laminated film was subjected to 5.8-fold free end uniaxial stretching at 160 ° C. using a tenter apparatus to obtain a stretched film.
- the thickness of the resin layer after stretching was 6.1 ⁇ m.
- the stretched film is immersed in a 60 ° C. hot bath for 60 seconds, dyed by immersion for about 150 seconds in a dyeing solution that is a mixed aqueous solution of iodine and potassium iodide at 30 ° C., and then excess iodine is added with pure water at 10 ° C. The liquid was washed away. Subsequently, it was immersed for 600 second in the bridge
- the polarizer layer was formed from the resin layer by the above process, and the light-polarizing laminated film was obtained. The blending ratio of each solution is as follows.
- ⁇ Dyeing solution> Water: 100 parts by weight Iodine: 0.6 parts by weight Potassium iodide: 10 parts by weight ⁇ Crosslinking solution> Water: 100 parts by weight Boric acid: 9.5 parts by weight Potassium iodide: 5 parts by weight (bonding of protective film)
- Polyvinyl alcohol powder manufactured by Kuraray Co., Ltd., average polymerization degree 1800, trade name: KL-318 was dissolved in 95 ° C. hot water to prepare an aqueous solution having a concentration of 3% by weight.
- the resulting aqueous solution was mixed with 1 part by weight of a crosslinking agent (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650) with respect to 2 parts by weight of polyvinyl alcohol powder to obtain an adhesive solution.
- a crosslinking agent manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650
- the protective film (TAC: KC4UY manufactured by Konica Minolta Opto Co., Ltd.) is applied after applying the above-mentioned polyvinyl alcohol-based adhesive on the surface opposite to the surface of the polarizer layer of the polarizing laminated film on the base film side.
- Bonding was performed to obtain a polarizing plate comprising five layers of a protective film, an adhesive layer, a polarizer layer, a primer layer, and a base film.
- the base film was peeled from the obtained polarizing plate.
- the base film was easily peeled off to obtain a polarizing plate comprising four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer.
- the thickness of the polarizer layer was 6.1 ⁇ m.
- Example 2 As polyvinyl alcohol used for the resin layer, polyvinyl alcohol powder (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average polymerization degree 2200, saponification degree 97.5 to 98.5 mol%, trade name: AH-22) was used. A stretched film was obtained in the same manner as in Example 1 except for the above. The thickness of the resin layer in the stretched film was 5.5 ⁇ m. Further, the polarizing plate of Example 2 comprising four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer is carried out in the same manner as in Example 1 by carrying out a dyeing process, a bonding process, a peeling process, and the like. Obtained. The thickness of the polarizer layer was 5.6 ⁇ m.
- Example 3 As polyvinyl alcohol used for the resin layer, polyvinyl alcohol powder (manufactured by Nippon Vinegar Poval Co., Ltd., average polymerization degree 2600, saponification degree 95.5 to 97.5 mol%, trade name: JM-26) was used. A stretched film was obtained in the same manner as in Example 1 except for the point. The thickness of the resin layer in the stretched film was 5.3 ⁇ m. Furthermore, the polarizing plate of Example 3 consisting of four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer is carried out by performing the dyeing step, the bonding step, the peeling step and the like in the same manner as in Example 1. Obtained. The thickness of the polarizer layer was 5.3 ⁇ m.
- Comparative Example 1 As the polyvinyl alcohol used for the resin layer, the same method as in Example 1 except that polyvinyl alcohol powder (manufactured by Kuraray Co., Ltd., average polymerization degree 1700, saponification degree 99.3 mol% or more, trade name: PVA117H) was used. A stretched film was obtained. The thickness of the resin layer in the stretched film was 6.3 ⁇ m. Furthermore, the dyeing process, the bonding process, the peeling process, and the like are performed in the same manner as in Example 1, and the polarizing plate of Comparative Example 1 including the protective film, the adhesive layer, the polarizer layer, and the primer layer is used. Obtained. The thickness of the polarizer layer was 6.3 ⁇ m.
- Comparative Example 2 As the polyvinyl alcohol used in the resin layer, polyvinyl alcohol (manufactured by Kuraray Co., Ltd., average polymerization degree 2400, saponification degree 99.9 mol% or more, trade name: Kuraray Poval VF-PS # 7500) is used. A stretched film was obtained in the same manner as in Example 1 except that the stretch ratio in the stretching step was 4.0. The thickness of the resin layer in the stretched film was 6.7 ⁇ m. Furthermore, the dyeing process, the bonding process, the peeling process, and the like are performed in the same manner as in Example 1 to obtain the polarizing plate of Comparative Example 2 that includes four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer. Obtained. The thickness of the polarizer layer was 6.7 ⁇ m.
- Comparative Example 3 As the polyvinyl alcohol used in the resin layer, polyvinyl alcohol (manufactured by Kuraray Co., Ltd., average polymerization degree 2400, saponification degree 99.9 mol% or more, trade name: Kuraray Poval VF-PS # 7500) is used. A stretched film was obtained in the same manner as in Example 1 except for the points mentioned above. The thickness of the resin layer in the stretched film was 6.3 ⁇ m. Furthermore, the dyeing process, the bonding process, the peeling process, and the like are performed in the same manner as in Example 1, and the polarizing plate of Comparative Example 3 including the protective film, the adhesive layer, the polarizer layer, and the primer layer is used. Obtained. The thickness of the polarizer layer was 6.3 ⁇ m.
- the MD transmittance and TD transmittance of a polarizing plate comprising four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer obtained by peeling the base film were measured with a spectrophotometer with an integrating sphere (JASCO ( V7100). Based on the above formulas (1) and (2), the single transmittance and the degree of polarization at each wavelength are calculated, and further the visibility correction is performed by the 2 degree field of view (C light source) of JIS Z 8701, and the visibility correction single transmission is performed. The rate (Ty) and the visibility correction polarization degree (Py) were determined. In addition, the measurement of the polarizing plate was set in the apparatus so that the protective film side was the detector side and light was incident from the primer layer side.
- Table 1 shows the visibility corrected single transmittance (Ty) and the visibility corrected polarization degree (Py) calculated for the polarizing plates of Example 1 and Comparative Examples 1 to 3.
- the polarizing plates obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were attached to the top and bottom of the liquid crystal cell via a pressure sensitive adhesive.
- the absorption axis of the polarizing plate attached on the upper side (viewing side) of the liquid crystal cell was arranged to be 170 degrees counterclockwise from the short side of the liquid crystal cell as viewed from the viewing side.
- the absorption axis of the polarizing plate attached to the lower side (backlight side) of the liquid crystal cell was arranged to be 80 degrees counterclockwise from the short side of the liquid crystal cell as viewed from the viewing side. This arrangement angle is the same as the arrangement angle of the absorption axis of the original polarizing plate originally attached to the liquid crystal cell.
- the mobile phone was assembled again to display an image.
- the display state was evaluated by visually determining the clarity of the image in a general indoor environment and in a dark room.
- Table 1 shows the evaluation results of the polarizing plates of Examples 1 to 3 and Comparative Examples 1 to 3.
- Examples 1 to 3 by using a polyvinyl alcohol-based resin having a saponification degree of 99.0 mol% or less and having a draw ratio of more than 5 times, a dyeing time that does not hinder normal production can be obtained. Desired Ty and Py could be obtained. Then, by using the obtained polarizing plate for a liquid crystal display device, clear and good image display was obtained.
- Comparative Examples 1 and 3 the polyvinyl alcohol resin having a saponification degree of more than 99.0 mol% is used and the draw ratio is more than 5 times, so that a dyeing time that does not hinder normal production is sufficient.
- the Py was also low.
- the contrast ratio (CR) was low and the image display lacked in clarity.
- Comparative Example 2 since the draw ratio is 5 times or less using a polyvinyl alcohol resin having a saponification degree of more than 99.0 mol%, the dyeing is sufficiently performed with a dyeing time that does not hinder normal production. Although it was made, Py was a low value. And when the obtained polarizing plate was used for the liquid crystal display device, the contrast ratio (CR) was low and the image display lacked in clarity.
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Abstract
Description
〔1〕 基材フィルムと、基材フィルムの一方の面に形成されている偏光子層とを備え、偏光子層は、厚さ10μm以下であり、二色性色素を吸着配向させたポリビニルアルコール系樹脂から形成され、ポリビニルアルコール系樹脂のケン化度は99.0モル%以下であり、視感度補正単体透過率(Ty)が40%以上でかつ視感度補正偏光度(Py)が99.9%以上である、偏光性積層フィルム。
〔2〕 偏光子層が、5倍超の延伸倍率で一軸延伸されている、〔1〕に記載の偏光性積層フィルム。
〔3〕 は、偏光板に用いられる〔1〕または〔2〕に記載の偏光性積層フィルム。
〔4〕 偏光子層が、プライマー層を介して基材フィルムの一方の面に形成されている、〔1〕~〔3〕のいずれかに記載の光性積層フィルム。 The present invention includes the following.
[1] Polyvinyl alcohol comprising a base film and a polarizer layer formed on one surface of the base film, the polarizer layer having a thickness of 10 μm or less and adsorbed and oriented with a dichroic dye The saponification degree of the polyvinyl alcohol resin is 99.0 mol% or less, the visibility corrected single transmittance (Ty) is 40% or more, and the visibility corrected polarization degree (Py) is 99.99%. Polarizing laminated film which is 9% or more.
[2] The polarizing laminated film according to [1], wherein the polarizer layer is uniaxially stretched at a stretch ratio of more than 5 times.
[3] is the polarizing laminated film according to [1] or [2] used for a polarizing plate.
[4] The optical laminated film according to any one of [1] to [3], wherein the polarizer layer is formed on one surface of the base film via a primer layer.
〔6〕 偏光子層が、粘着剤層または接着剤層を介して保護フィルムの一方の面に形成されている、〔5〕に記載の偏光板。
〔7〕 偏光子層が、5倍超の延伸倍率で一軸延伸されている、〔5〕または〔6〕に記載の偏光板。 [5] A polyvinyl alcohol resin comprising a protective film and a polarizer layer formed on one surface of the protective film, the polarizer layer having a thickness of 10 μm or less and adsorbed and oriented with a dichroic dye The saponification degree of the polyvinyl alcohol resin is 99.0 mol% or less, the visibility corrected single transmittance (Ty) is 40% or more, and the visibility corrected polarization degree (Py) is 99.9%. This is the polarizing plate.
[6] The polarizing plate according to [5], wherein the polarizer layer is formed on one surface of the protective film via an adhesive layer or an adhesive layer.
[7] The polarizing plate according to [5] or [6], wherein the polarizer layer is uniaxially stretched at a stretch ratio of more than 5 times.
<偏光性積層フィルムの構成>
図1は、本発明に係る偏光性積層フィルムの基本的な層構成の一例を示す概略断面図である。偏光性積層フィルム10は、基材フィルム11と、基材フィルム11の一方の面に形成されている偏光子層12とを備える。偏光子層12は、厚さ10μm以下であり、二色性色素を吸着配向させたポリビニルアルコール系樹脂から形成されている。ポリビニルアルコール系樹脂のケン化度は99.0モル%以下である。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
<Configuration of polarizing laminated film>
FIG. 1 is a schematic cross-sectional view showing an example of a basic layer configuration of a polarizing laminate film according to the present invention. The polarizing laminated
また視感度補正偏光度(Py)は、前記と同様にMD透過率とTD透過率を求め、以下に表す式(2)に基づいて各波長における偏光度(%)を算出し、前記と同様の視感度補正を行うことにより求めることができる。
「MD透過率」とは、グラントムソンプリズムから出る偏光の向きと偏光板サンプルの透過軸を平行にしたときの透過率であり、式(1)、式(2)においては「MD」と表す。また、「TD透過率」とは、グラントムソンプリズムから出る偏光の向きと偏光板サンプルを透過軸を直交にしたときの透過率であり、式(1)、式(2)においては「TD」と表す。MD透過率、TD透過率ともに、積分球付き分光光度計にて測定することができる。
単体透過率(%)=(MD+TD)/2 ・・・式(1)
偏光度(%)=√{(MD−TD)/(MD+TD)}×100 ・・・式(2)
以下、各構成要素について詳細に説明する。 In addition, the visibility corrected single transmittance (Ty) is obtained in the wavelength range of 380 nm to 780 nm by obtaining the MD transmittance and the TD transmittance of the polarizing laminated film or the polarizing plate, and based on the formula (1) shown below. It can be obtained by calculating the single transmittance at the wavelength and further correcting the visibility with the 2 degree visual field (C light source) of JIS Z 8701.
In addition, the visibility correction polarization degree (Py) is obtained by calculating MD transmittance and TD transmittance in the same manner as described above, and calculating the degree of polarization (%) at each wavelength based on the following formula (2). Can be obtained by correcting the visibility.
“MD transmittance” is the transmittance when the direction of polarized light emitted from the Glan-Thompson prism is parallel to the transmission axis of the polarizing plate sample, and is expressed as “MD” in the equations (1) and (2). . The “TD transmittance” is the transmittance when the direction of polarized light emitted from the Glan-Thompson prism and the polarizing plate sample are orthogonal to the transmission axis. In the formulas (1) and (2), “TD”. It expresses. Both MD transmittance and TD transmittance can be measured with a spectrophotometer with an integrating sphere.
Single transmittance (%) = (MD + TD) / 2 Formula (1)
Degree of polarization (%) = √ {(MD−TD) / (MD + TD)} × 100 (2)
Hereinafter, each component will be described in detail.
本発明で用いられる基材フィルム11の材料としては、たとえば、透明性、機械的強度、熱安定性、延伸性などに優れる熱可塑性樹脂が用いられる。このような熱可塑性樹脂の具体例としては、セルローストリアセテート等のセルロースエステル系樹脂、ポリエステル系樹脂、ポリエーテルスルホン系樹脂、ポリスルホン系樹脂、ポリカーボネート系樹脂、ポリアミド系樹脂、ポリイミド系樹脂、ポリオレフィン系樹脂、(メタ)アクリル系樹脂、環状ポリオレフィン系樹脂(ノルボルネン系樹脂)、ポリアリレート系樹脂、ポリスチレン系樹脂、ポリビニルアルコール系樹脂、およびこれらの混合物などが挙げられる。
基材フィルムの材料として、セルロースエステル系樹脂、ポリオレフィン系樹脂、環状ポリオレフィン系樹脂および(メタ)アクリル系樹脂からなる群から選択される少なくともいずれか1つが含まれることが好ましい。 [Base film]
As a material of the
The material for the base film preferably includes at least one selected from the group consisting of cellulose ester resins, polyolefin resins, cyclic polyolefin resins, and (meth) acrylic resins.
これらの中でも、セルローストリアセテートが特に好ましい。セルローストリアセテートは多くの製品が市販されており、入手容易性やコストの点でも有利である。セルローストリアセテートの市販品の例としては、フジタック(登録商標)TD80(富士フィルム(株)製)、フジタック(登録商標)TD80UF(富士フィルム(株)製)、フジタック(登録商標)TD80UZ(富士フィルム(株)製)、フジタック(登録商標)TD40UZ(富士フィルム(株)製)、KC8UX2M(コニカミノルタオプト(株)製)、KC4UY(コニカミノルタオプト(株)製)などが挙げられる。 The cellulose ester resin is an ester of cellulose and a fatty acid. Specific examples of the cellulose ester resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate.
Among these, cellulose triacetate is particularly preferable. Many products of cellulose triacetate are commercially available, which is advantageous in terms of availability and cost. Examples of commercially available cellulose triacetate include Fujitac (registered trademark) TD80 (manufactured by Fuji Film Co., Ltd.), Fujitac (registered trademark) TD80UF (manufactured by Fuji Film Co., Ltd.), Fujitac (registered trademark) TD80UZ (Fuji Film ( Co., Ltd.), Fujitac (registered trademark) TD40UZ (Fuji Film Co., Ltd.), KC8UX2M (Konica Minolta Opto Co., Ltd.), KC4UY (Konica Minolta Opto Co., Ltd.), and the like.
環状ポリオレフィン系樹脂は、環状オレフィンを重合単位として重合される樹脂の総称であり、たとえば、JPH01−240517−A、JPH03−14882−A、JPH03−122137−A等に記載されている樹脂が挙げられる。具体例としては、環状オレフィンの開環(共)重合体、環状オレフィンの付加重合体、環状オレフィンとエチレン、プロピレン等のα−オレフィンとその共重合体(代表的にはランダム共重合体)、およびこれらを不飽和カルボン酸やその誘導体で変性したグラフト重合体、ならびにそれらの水素化物などが挙げられる。環状オレフィンの具体例としては、ノルボルネン系モノマーが挙げられる。 Examples of the polyolefin resin include polyethylene and polypropylene. When a base film made of polypropylene is used, it is preferable because it can be stably stretched at a high magnification. As the cyclic polyolefin resin, a norbornene resin is preferably used.
The cyclic polyolefin-based resin is a general term for resins that are polymerized using a cyclic olefin as a polymerization unit, and examples thereof include resins described in JPH01-240517-A, JPH03-14882-A, JPH03-122137-A, and the like. . Specific examples include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, cyclic olefins and α-olefins such as ethylene and propylene (typically random copolymers), And graft polymers obtained by modifying them with an unsaturated carboxylic acid or a derivative thereof, and hydrides thereof. Specific examples of the cyclic olefin include norbornene monomers.
好ましくは、ポリ(メタ)アクリル酸メチルなどのポリ(メタ)アクリル酸C1−6アルキルが挙げられる。(メタ)アクリル系樹脂として、より好ましくは、メタクリル酸メチルを主成分(50~100重量%、好ましくは70~100重量%)とするメタクリル酸メチル系樹脂が用いられる。 Any appropriate (meth) acrylic resin can be adopted as the (meth) acrylic resin. For example, poly (meth) acrylic acid ester such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester -(Meth) acrylic acid copolymer, (meth) acrylic acid methyl-styrene copolymer (MS resin, etc.), polymer having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer) And methyl methacrylate- (meth) acrylate norbornyl copolymer).
Preferably, C1-6 alkyl poly (meth) acrylates, such as poly (meth) acrylate methyl, are mentioned. More preferably, the (meth) acrylic resin is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).
偏光子層12は、具体的には、一軸延伸されたポリビニルアルコール系樹脂層に二色性色素を吸着配向させたものである。ポリビニルアルコール系樹脂としては、ポリ酢酸ビニル系樹脂をケン化したものを用いることができる。ポリ酢酸ビニル系樹脂としては、酢酸ビニルの単独重合体であるポリ酢酸ビニルのほか、酢酸ビニルと共重合可能な他の単量体との共重合体などが例示される。酢酸ビニルに共重合可能な他の単量体としては、例えば、不飽和カルボン酸類、オレフィン類、ビニルエーテル類、不飽和スルホン酸類、アンモニウム基を有するアクリルアミド類などが挙げられる。 (Polarizer layer)
Specifically, the
ケン化度が高いほど、水酸基の割合が高いことを示しており、すなわち結晶化を阻害する酢酸基の割合が低いことを示している。また、本発明に用いるポリビニルアルコール系樹脂は、ケン化度が99.0モル%以下であれば特に限定されるものではなく、一部が変性されている変性ポリビニルアルコールでもよい。例えば、ポリビニルアルコール系樹脂をエチレン、プロピレン等のオレフィン、アクリル酸、メタクリル酸、クロトン酸等の不飽和カルボン酸、不飽和カルボン酸のアルキルエステル、アクリルアミドなどで数%ほど変性したものなどが挙げられる。ポリビニルアルコール系樹脂の平均重合度も特に限定されるものではないが、100~10000が好ましく、1500~10000がより好ましい。 Saponification degree (mol%) = (number of hydroxyl groups) ÷ (number of hydroxyl groups + number of acetate groups) × 100
The higher the degree of saponification, the higher the proportion of hydroxyl groups, that is, the lower the proportion of acetate groups that inhibit crystallization. The polyvinyl alcohol resin used in the present invention is not particularly limited as long as the saponification degree is 99.0 mol% or less, and may be modified polyvinyl alcohol partially modified. For example, polyvinyl alcohol-based resins modified with olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, alkyl esters of unsaturated carboxylic acids, acrylamide, etc. . The average degree of polymerization of the polyvinyl alcohol-based resin is not particularly limited, but is preferably 100 to 10,000, and more preferably 1500 to 10,000.
図2は、本発明に係る偏光板の基本的な層構成の一例を示す概略断面図である。偏光板13は、保護フィルム14と、保護フィルム14の一方の面に形成されている偏光子層12とを備える。偏光子層12は、厚さ10μm以下であり、二色性色素を吸着配向させたポリビニルアルコール系樹脂から形成されている。ポリビニルアルコール系樹脂のケン化度は99.0モル%以下である。 <Configuration of polarizing plate>
FIG. 2 is a schematic cross-sectional view showing an example of a basic layer configuration of the polarizing plate according to the present invention. The
保護フィルム14としては、光学機能を有さない単なる保護フィルムであってもかまわないし、位相差フィルムや輝度向上フィルムといった光学機能を併せ持つ保護フィルムであってもかまわない。保護フィルム14の材料としては、特に限定されるものではないが、例えば、環状ポリオレフィン系樹脂フィルム、トリアセチルセルロース、ジアセチルセルロースのような樹脂からなる酢酸セルロース系樹脂フィルム、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレートのような樹脂からなるポリエステル系樹脂フィルム、ポリカーボネート系樹脂フィルム、アクリル系樹脂フィルム、ポリプロピレン系樹脂フィルムなど、当分野において従来より広く用いられてきているフィルムを挙げることができる。 〔Protective film〕
The
偏光子層12は、上述の偏光性積層フィルム10の偏光子層12と同様の構成とすることができる。 (Polarizer layer)
The
保護フィルム14と偏光子層12との貼合に用いられる粘着剤は、通常、アクリル系樹脂、スチレン系樹脂、シリコーン系樹脂などをベースポリマーとし、そこに、イソシアネート化合物、エポキシ化合物、アジリジン化合物などの架橋剤を加えた組成物からなる。
さらに微粒子を含有して光散乱性を示す粘着剤層とすることもできる。 (Adhesive layer)
The pressure-sensitive adhesive used for bonding the
Furthermore, it can also be set as the adhesive layer which contains microparticles | fine-particles and shows light-scattering property.
保護フィルム14と偏光子層12との貼合に用いられる接着剤は、たとえば、ポリビニルアルコール系樹脂水溶液、水系二液型ウレタン系エマルジョン接着剤などを用いた水系接着剤が挙げられる。保護フィルム14としてケン化処理などで親水化処理された酢酸セルロース系フィルムを用いる場合、偏光子層12との貼合用の水系接着剤として、ポリビニルアルコール系樹脂水溶液が好適に用いられる。接着剤として用いるポリビニルアルコール系樹脂には、酢酸ビニルの単独重合体であるポリ酢酸ビニルをケン化処理して得られるビニルアルコールホモポリマーのほか、酢酸ビニルとこれに共重合可能な他の単量体との共重合体をケン化処理して得られるビニルアルコール系共重合体、さらにはそれらの水酸基を部分的に変性した変性ポリビニルアルコール系重合体などがある。水系接着剤には、多価アルデヒド、水溶性エポキシ化合物、メラミン系化合物、ジルコニア化合物、亜鉛化合物などが添加剤として添加されてもよい。このような水系の接着剤を用いた場合、それから得られる接着剤層は、通常1μm以下となり、通常の光学顕微鏡で断面を観察しても、その接着剤層は事実上観察されない。 [Adhesive layer]
Examples of the adhesive used for bonding the
以上のようして製造される本発明の偏光板は、実用に際して他の光学層を積層した偏光板として用いることができる。また、上記保護フィルム14がこれらの光学層の機能を有していてもよい。他の光学層の例としては、ある種の偏光光を透過し、それと逆の性質を示す偏光光を反射する反射型偏光フィルム、表面に凹凸形状を有する防眩機能付きフィルム、表面反射防止機能付きフィルム、表面に反射機能を有する反射フィルム、反射機能と透過機能とを併せ持つ半透過反射フィルム、視野角補償フィルムが挙げられる。 [Other optical layers]
The polarizing plate of the present invention produced as described above can be used as a polarizing plate in which other optical layers are laminated in practical use. Moreover, the said
図3は、図1に示す偏光性積層フィルム10の製造方法の一実施形態を示すフローチャートである。これによると、偏光性積層フィルム10の製造方法は、基材フィルム11の一方の表面上にケン化度が99.0モル%以下であるポリビニルアルコール系樹脂からなる樹脂層を形成して積層フィルムとする樹脂層形成工程(S10)、上記積層フィルムを5倍超の延伸倍率で一軸延伸処理を施し延伸フィルムとする延伸工程(S20)、上記延伸フィルムの樹脂層を二色性色素で染色して偏光子層12として偏光性積層フィルム10を得る染色工程(S30)をこの順番に実施するものである。樹脂層形成工程(S10)、延伸工程(S20)及び染色工程(S30)は、後述する偏光板の製造方法において対応する各工程と同様である。 <Method for producing polarizing laminated film>
FIG. 3 is a flowchart showing an embodiment of a method for producing the polarizing
図4は、図2に示す偏光板13の製造方法の一実施形態を示すフローチャートである。
これによると、偏光板13の製造方法は、基材フィルムの一方の表面上にケン化度が99.0モル%以下であるポリビニルアルコール系樹脂からなる樹脂層を形成して積層フィルムとする樹脂層形成工程(S10)、上記積層フィルムに5倍超の延伸倍率で一軸延伸処理を施し延伸フィルムとする延伸工程(S20)、二色性色素で染色して偏光子層12として偏光性積層フィルムを得る染色工程(S30)をこの順番に実施した後、上記偏光性積層フィルムの偏光子層12の基材フィルム11側の面とは反対側の面に保護フィルム14を貼合して多層フィルムを得る貼合工程(S40)、上記多層フィルムから基材フィルム11を剥離する剥離工程(S50)をこの順に備える。 <Production method of polarizing plate>
FIG. 4 is a flowchart showing an embodiment of a method for manufacturing the
According to this, the
ここでは、基材フィルムの一方の表面上にポリビニルアルコール系樹脂からなる樹脂層を形成する。 [Resin Layer Forming Step (S10)]
Here, a resin layer made of a polyvinyl alcohol-based resin is formed on one surface of the base film.
ここでは、基材フィルムおよび樹脂層からなる積層フィルムを、積層フィルムの元長に対して、5倍超の延伸倍率となるように一軸延伸し延伸フィルムを得る。好ましくは、5倍超かつ17倍以下の延伸倍率となるように一軸延伸する。さらに好ましくは5倍超かつ8倍以下の延伸倍率となるように一軸延伸する。延伸倍率が5倍以下だと、ポリビニルアルコール系樹脂からなる樹脂層が十分に配向しないため、結果として、偏光子層の偏光度が十分に高くならない。一方、延伸倍率が17倍を超えると延伸時の積層フィルムの破断が生じ易くなると同時に、延伸フィルムの厚みが必要以上に薄くなり、後工程での加工性・ハンドリング性が低下するおそれがある。延伸工程(S20)における延伸処理は、一段での延伸に限定されることはなく多段で行うこともできる。多段で行う場合は、延伸処理の全段を合わせて5倍超の延伸倍率となるように延伸処理を行う。 [Stretching step (S20)]
Here, a laminated film composed of a base film and a resin layer is uniaxially stretched so as to have a draw ratio of more than 5 times with respect to the original length of the laminated film to obtain a stretched film. Preferably, uniaxial stretching is performed so that the stretching ratio is more than 5 times and not more than 17 times. More preferably, it is uniaxially stretched so that the stretch ratio is more than 5 times and not more than 8 times. When the draw ratio is 5 times or less, the resin layer made of the polyvinyl alcohol resin is not sufficiently oriented, and as a result, the degree of polarization of the polarizer layer is not sufficiently high. On the other hand, when the draw ratio exceeds 17 times, the laminated film is likely to break during stretching, and at the same time, the thickness of the stretched film becomes unnecessarily thin, and the workability and handling properties in the subsequent process may be reduced. The stretching process in the stretching step (S20) is not limited to one-stage stretching, and can be performed in multiple stages. In the case of performing in multiple stages, the stretching process is performed so that the stretching ratio is more than 5 times by combining all stages of the stretching process.
ここでは、延伸フィルムの樹脂層を、二色性色素で染色する。二色性色素としては、たとえば、ヨウ素や有機染料などが挙げられる。有機染料としては、たとえば、レッドBR、レッドLR、レッドR、ピンクLB、ルビンBL、ボルドーGS、スカイブルーLG、レモンイエロー、ブルーBR、ブルー2R、ネイビーRY、グリーンLG、バイオレットLB、バイオレットB、ブラックH、ブラックB、ブラックGSP、イエロー3G、イエローR、オレンジLR、オレンジ3R、スカーレットGL、スカーレットKGL、コンゴーレッド、ブリリアントバイオレットBK、スプラブルーG、スプラブルーGL、スプラオレンジGL、ダイレクトスカイブルー、ダイレクトファーストオレンジS、ファーストブラックなどが使用できる。これらの二色性物質は、一種類でも良いし、二種類以上を併用して用いても良い。 [Dyeing step (S30)]
Here, the resin layer of the stretched film is dyed with a dichroic dye. Examples of the dichroic dye include iodine and organic dyes. Examples of organic dyes include Red BR, Red LR, Red R, Pink LB, Rubin BL, Bordeaux GS, Sky Blue LG, Lemon Yellow, Blue BR, Blue 2R, Navy RY, Green LG, Violet LB, Violet B, Black H, Black B, Black GSP, Yellow 3G, Yellow R, Orange LR, Orange 3R, Scarlet GL, Scarlet KGL, Congo Red, Brilliant Violet BK, Spura Blue G, Spura Blue GL, Spura Orange GL, Direct Sky Blue, Direct First Orange S, First Black, etc. can be used. One kind of these dichroic substances may be used, or two or more kinds may be used in combination.
本明細書においては、偏光子としての機能を有する樹脂層を偏光子層といい、基材フィルム上に偏光子層を備えた積層体を偏光性積層フィルムという。 It is preferable to perform a drying process after the washing process. Any appropriate method (for example, natural drying, ventilation drying, heat drying) can be adopted as the drying step. For example, the drying temperature in the case of heat drying is usually 20 to 95 ° C., and the drying time is usually about 1 to 15 minutes. Through the above dyeing step (S30), the resin layer has a function as a polarizer.
In this specification, the resin layer which has a function as a polarizer is called a polarizer layer, and the laminated body provided with the polarizer layer on the base film is called a polarizing laminated film.
ここでは、偏光性積層フィルムにおける偏光子層の基材フィルム側の面とは反対側の面に保護フィルムを貼合して多層フィルムを得る。保護フィルムを貼合する方法としては、粘着剤で偏光子層12と保護フィルム14を貼合する方法、接着剤で偏光子層12面と保護フィルム14を貼合する方法が挙げられる。保護フィルムとして適した材料は、上述の偏光板の構成の説明で述べた通りである。また、使用に適した接着剤、粘着剤の材料、およびこれらを用いて偏光子層12と保護フィルム14を貼合する好ましい方法は、上述の偏光板の構成の説明で述べた通りである。 [Bonding process (S40)]
Here, a protective film is bonded to the surface opposite to the surface on the base film side of the polarizer layer in the polarizing laminated film to obtain a multilayer film. As a method of bonding a protective film, the method of bonding the
本実施形態の偏光板の製造方法では、図4に示すように、保護フィルムを偏光性積層フィルムの偏光子層12に貼合する貼合工程(S40)の後、剥離工程(S50)を行なう。剥離工程(S50)では、基材フィルムを多層フィルムから剥離する。基材フィルムの剥離方法は特に限定されるものでなく、通常の粘着剤付偏光板で行われる剥離フィルムの剥離工程と同様の方法で剥離できる。保護フィルムの貼合工程(S40)の後、そのまますぐ剥離してもよいし、一度ロール状に巻き取った後、別に剥離工程を設けて剥離してもよい。 [Peeling step (S50)]
In the manufacturing method of the polarizing plate of this embodiment, as shown in FIG. 4, a peeling process (S50) is performed after the bonding process (S40) which bonds a protective film to the
図4に示す製造方法にしたがって、図2に示す偏光板を作製した。 Example 1
The polarizing plate shown in FIG. 2 was produced according to the manufacturing method shown in FIG.
基材フィルムとして、厚み110μmの未延伸のポリプロピレン(PP)フィルム(融点:163℃)を用いた。 (Base film)
An unstretched polypropylene (PP) film (melting point: 163 ° C.) having a thickness of 110 μm was used as the base film.
ポリビニルアルコール粉末(日本合成化学工業(株)製、平均重合度1100、ケン化度99.5モル%、商品名:Z−200)を95℃の熱水に溶解させ濃度3重量%の水溶液を調製した。得られた水溶液にポリビニルアルコール粉末6重量部に対して5重量部の架橋剤(住友化学(株)製、商品名:スミレーズ(登録商標)レジン650)を混ぜた。
得られた混合水溶液をコロナ処理を施した基材フィルム上にマイクログラビアコーターを用いて塗工し、80℃で10分間乾燥させ厚み0.2μmのプライマー層を形成した。 (Primer layer formation process)
Polyvinyl alcohol powder (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average polymerization degree 1100, saponification degree 99.5 mol%, trade name: Z-200) is dissolved in 95 ° C. hot water to give an aqueous solution having a concentration of 3% by weight. Prepared. The resulting aqueous solution was mixed with 5 parts by weight of a crosslinking agent (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650) with respect to 6 parts by weight of polyvinyl alcohol powder.
The obtained mixed aqueous solution was applied on a corona-treated substrate film using a microgravure coater and dried at 80 ° C. for 10 minutes to form a primer layer having a thickness of 0.2 μm.
ポリビニルアルコール粉末(クラレ(株)製、平均重合度2400、ケン化度98.0~99.0モル%、商品名:PVA124)を95℃の熱水中に溶解させ濃度8重量%のポリビニルアルコール水溶液を調製した。得られた水溶液を上記プライマー層の上にリップコーターを用いて塗工し80℃で20分間乾燥させ、基材フィルム、プライマー層、樹脂層からなる三層の積層フィルムを作成した。 (Resin layer forming process)
Polyvinyl alcohol powder having a concentration of 8% by weight by dissolving polyvinyl alcohol powder (manufactured by Kuraray Co., Ltd., average polymerization degree 2400, saponification degree 98.0 to 99.0 mol%, trade name: PVA124) in hot water at 95 ° C. An aqueous solution was prepared. The obtained aqueous solution was coated on the primer layer using a lip coater and dried at 80 ° C. for 20 minutes to prepare a three-layer laminated film comprising a base film, a primer layer, and a resin layer.
上記積層フィルムをテンター装置を用いて160℃で5.8倍の自由端一軸延伸を実施し延伸フィルムを得た。延伸後の樹脂層の厚みは6.1μmであった。 (Stretching process)
The laminated film was subjected to 5.8-fold free end uniaxial stretching at 160 ° C. using a tenter apparatus to obtain a stretched film. The thickness of the resin layer after stretching was 6.1 μm.
その後、延伸フィルムを60℃の温浴に60秒浸漬し、30℃のヨウ素とヨウ化カリウムの混合水溶液である染色溶液に150秒ほど浸漬して染色した後、10℃の純水で余分なヨウ素液を洗い流した。次いで76℃のホウ酸とヨウ化カリウムの混合水溶液である架橋溶液に600秒浸漬させた。その後10℃の純水で4秒間洗浄し、最後に50℃で300秒間乾燥させた。以上の工程により樹脂層から偏光子層を形成し、偏光性積層フィルムを得た。各溶液の配合比率は以下である。 (Dyeing process)
Thereafter, the stretched film is immersed in a 60 ° C. hot bath for 60 seconds, dyed by immersion for about 150 seconds in a dyeing solution that is a mixed aqueous solution of iodine and potassium iodide at 30 ° C., and then excess iodine is added with pure water at 10 ° C. The liquid was washed away. Subsequently, it was immersed for 600 second in the bridge | crosslinking solution which is a 76 degreeC mixed aqueous solution of boric acid and potassium iodide. Thereafter, it was washed with pure water at 10 ° C. for 4 seconds, and finally dried at 50 ° C. for 300 seconds. The polarizer layer was formed from the resin layer by the above process, and the light-polarizing laminated film was obtained. The blending ratio of each solution is as follows.
水:100重量部
ヨウ素:0.6重量部
ヨウ化カリウム:10重量部
<架橋溶液>
水:100重量部
ホウ酸:9.5重量部
ヨウ化カリウム:5重量部
(保護フィルムの貼合)
ポリビニルアルコール粉末((株)クラレ製、平均重合度1800、商品名:KL−318)を95℃の熱水に溶解させ濃度3重量%の水溶液を調製した。得られた水溶液に架橋剤(住友化学(株)製、商品名:スミレーズ(登録商標)レジン650)をポリビニルアルコール粉末2重量部に対して1重量部を混ぜて接着剤溶液とした。上記偏光性積層フィルムの偏光子層の基材フィルム側の面とは反対側の面に上述のポリビニルアルコール系接着剤を塗布した後に保護フィルム(コニカミノルタオプト(株)製のTAC:KC4UY)を貼合し、保護フィルム、接着剤層、偏光子層、プライマー層、基材フィルムの五層からなる偏光板を得た。得られた偏光板から基材フィルムを剥離した。基材フィルムは容易に剥離され、保護フィルム、接着剤層、偏光子層、プライマー層の四層からなる偏光板を得た。偏光子層の厚みは6.1μmであった。 <Dyeing solution>
Water: 100 parts by weight Iodine: 0.6 parts by weight Potassium iodide: 10 parts by weight <Crosslinking solution>
Water: 100 parts by weight Boric acid: 9.5 parts by weight Potassium iodide: 5 parts by weight (bonding of protective film)
Polyvinyl alcohol powder (manufactured by Kuraray Co., Ltd., average polymerization degree 1800, trade name: KL-318) was dissolved in 95 ° C. hot water to prepare an aqueous solution having a concentration of 3% by weight. The resulting aqueous solution was mixed with 1 part by weight of a crosslinking agent (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650) with respect to 2 parts by weight of polyvinyl alcohol powder to obtain an adhesive solution. The protective film (TAC: KC4UY manufactured by Konica Minolta Opto Co., Ltd.) is applied after applying the above-mentioned polyvinyl alcohol-based adhesive on the surface opposite to the surface of the polarizer layer of the polarizing laminated film on the base film side. Bonding was performed to obtain a polarizing plate comprising five layers of a protective film, an adhesive layer, a polarizer layer, a primer layer, and a base film. The base film was peeled from the obtained polarizing plate. The base film was easily peeled off to obtain a polarizing plate comprising four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer. The thickness of the polarizer layer was 6.1 μm.
樹脂層に用いるポリビニルアルコールとして、ポリビニルアルコール粉末(日本合成化学工業(株)製、平均重合度2200、ケン化度97.5~98.5モル%、商品名:AH−22)を用いた点以外は実施例1と同じ方法で延伸フィルムを得た。延伸フィルムにおける樹脂層の厚みは5.5μmであった。さらに、実施例1と同様の方法で染色工程、貼合工程、剥離工程などを実施して、保護フィルム、接着剤層、偏光子層、プライマー層の四層からなる実施例2の偏光板を得た。偏光子層の厚みは5.6μmであった。 Example 2
As polyvinyl alcohol used for the resin layer, polyvinyl alcohol powder (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average polymerization degree 2200, saponification degree 97.5 to 98.5 mol%, trade name: AH-22) was used. A stretched film was obtained in the same manner as in Example 1 except for the above. The thickness of the resin layer in the stretched film was 5.5 μm. Further, the polarizing plate of Example 2 comprising four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer is carried out in the same manner as in Example 1 by carrying out a dyeing process, a bonding process, a peeling process, and the like. Obtained. The thickness of the polarizer layer was 5.6 μm.
樹脂層に用いるポリビニルアルコールとして、ポリビニルアルコール粉末(日本酢ビ・ポバール(株)製、平均重合度2600、ケン化度95.5~97.5モル%、商品名:JM−26)を用いた点以外は実施例1と同じ方法で延伸フィルムを得た。延伸フィルムにおける樹脂層の厚みは5.3μmであった。さらに、実施例1と同様の方法で染色工程、貼合工程、剥離工程などを実施して、保護フィルム、接着剤層、偏光子層、プライマー層の四層からなる実施例3の偏光板を得た。偏光子層の厚みは5.3μmであった。 Example 3
As polyvinyl alcohol used for the resin layer, polyvinyl alcohol powder (manufactured by Nippon Vinegar Poval Co., Ltd., average polymerization degree 2600, saponification degree 95.5 to 97.5 mol%, trade name: JM-26) was used. A stretched film was obtained in the same manner as in Example 1 except for the point. The thickness of the resin layer in the stretched film was 5.3 μm. Furthermore, the polarizing plate of Example 3 consisting of four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer is carried out by performing the dyeing step, the bonding step, the peeling step and the like in the same manner as in Example 1. Obtained. The thickness of the polarizer layer was 5.3 μm.
樹脂層に用いるポリビニルアルコールとして、ポリビニルアルコール粉末(クラレ(株)製、平均重合度1700、ケン化度99.3モル%以上、商品名:PVA117H)を用いた点以外は実施例1と同じ方法で延伸フィルムを得た。延伸フィルムにおける樹脂層の厚みは6.3μmであった。さらに、実施例1と同様の方法で染色工程、貼合工程、剥離工程などを実施して、保護フィルム、接着剤層、偏光子層、プライマー層の四層からなる比較例1の偏光板を得た。偏光子層の厚みは6.3μmであった。 Comparative Example 1
As the polyvinyl alcohol used for the resin layer, the same method as in Example 1 except that polyvinyl alcohol powder (manufactured by Kuraray Co., Ltd., average polymerization degree 1700, saponification degree 99.3 mol% or more, trade name: PVA117H) was used. A stretched film was obtained. The thickness of the resin layer in the stretched film was 6.3 μm. Furthermore, the dyeing process, the bonding process, the peeling process, and the like are performed in the same manner as in Example 1, and the polarizing plate of Comparative Example 1 including the protective film, the adhesive layer, the polarizer layer, and the primer layer is used. Obtained. The thickness of the polarizer layer was 6.3 μm.
樹脂層に用いるポリビニルアルコールとして、ポリビニルアルコール(クラレ(株)製、平均重合度2400、ケン化度99.9モル%以上、商品名:クラレポバールVF−PS#7500)を細かく刻んだものを用いた点と、延伸工程における延伸倍率を4.0倍とした点以外は実施例1と同じ方法で延伸フィルムを得た。延伸フィルムにおける樹脂層の厚みは6.7μmであった。さらに、実施例1と同様の方法で染色工程、貼合工程、剥離工程などを実施して、保護フィルム、接着剤層、偏光子層、プライマー層の四層からなる比較例2の偏光板を得た。偏光子層の厚みは6.7μmであった。 Comparative Example 2
As the polyvinyl alcohol used in the resin layer, polyvinyl alcohol (manufactured by Kuraray Co., Ltd., average polymerization degree 2400, saponification degree 99.9 mol% or more, trade name: Kuraray Poval VF-PS # 7500) is used. A stretched film was obtained in the same manner as in Example 1 except that the stretch ratio in the stretching step was 4.0. The thickness of the resin layer in the stretched film was 6.7 μm. Furthermore, the dyeing process, the bonding process, the peeling process, and the like are performed in the same manner as in Example 1 to obtain the polarizing plate of Comparative Example 2 that includes four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer. Obtained. The thickness of the polarizer layer was 6.7 μm.
樹脂層に用いるポリビニルアルコールとして、ポリビニルアルコール(クラレ(株)製、平均重合度2400、ケン化度99.9モル%以上、商品名:クラレポバールVF−PS#7500)を細かく刻んだものを用いた点以外は実施例1と同じ方法で延伸フィルムを得た。延伸フィルムにおける樹脂層の厚みは6.3μmであった。さらに、実施例1と同様の方法で染色工程、貼合工程、剥離工程などを実施して、保護フィルム、接着剤層、偏光子層、プライマー層の四層からなる比較例3の偏光板を得た。偏光子層の厚みは6.3μmであった。 Comparative Example 3
As the polyvinyl alcohol used in the resin layer, polyvinyl alcohol (manufactured by Kuraray Co., Ltd., average polymerization degree 2400, saponification degree 99.9 mol% or more, trade name: Kuraray Poval VF-PS # 7500) is used. A stretched film was obtained in the same manner as in Example 1 except for the points mentioned above. The thickness of the resin layer in the stretched film was 6.3 μm. Furthermore, the dyeing process, the bonding process, the peeling process, and the like are performed in the same manner as in Example 1, and the polarizing plate of Comparative Example 3 including the protective film, the adhesive layer, the polarizer layer, and the primer layer is used. Obtained. The thickness of the polarizer layer was 6.3 μm.
基材フィルムを剥離して得られた保護フィルム、接着剤層、偏光子層、プライマー層の四層からなる偏光板のMD透過率及びTD透過率は、積分球付き分光光度計(日本分光(株)製、V7100)にて測定した。前記式(1)、式(2)に基づいて各波長における単体透過率、偏光度を算出し、さらにJIS Z 8701の2度視野(C光源)により視感度補正を行い、視感度補正単体透過率(Ty)および視感度補正偏光度(Py)を求めた。なお、偏光板の測定は保護フィルム側をディテクター側とし、プライマー層側から光が入光するように機器にセットした。 (Measurement of polarization performance)
The MD transmittance and TD transmittance of a polarizing plate comprising four layers of a protective film, an adhesive layer, a polarizer layer, and a primer layer obtained by peeling the base film were measured with a spectrophotometer with an integrating sphere (JASCO ( V7100). Based on the above formulas (1) and (2), the single transmittance and the degree of polarization at each wavelength are calculated, and further the visibility correction is performed by the 2 degree field of view (C light source) of JIS Z 8701, and the visibility correction single transmission is performed. The rate (Ty) and the visibility correction polarization degree (Py) were determined. In addition, the measurement of the polarizing plate was set in the apparatus so that the protective film side was the detector side and light was incident from the primer layer side.
KDDI(株)から販売されている「au EXILIMケータイW53CA」(製造元:CASIO計算機(株)を分解し、液晶セルの上下に貼ってあった偏光板を剥がして液晶セルを取り出した。 (Evaluation of mounting on commercial mobile phones)
“Au EXILIM mobile phone W53CA” (manufacturer: CASIO Computer Co., Ltd.) sold by KDDI Corporation was disassembled, and the polarizing plates attached to the top and bottom of the liquid crystal cell were peeled off, and the liquid crystal cell was taken out.
11 基材フィルム
12 偏光子層
13 偏光板
14 保護フィルム DESCRIPTION OF
Claims (9)
- 基材フィルムと、基材フィルムの一方の面に形成されている偏光子層とを備え、
偏光子層は、厚さ10μm以下であり、二色性色素を吸着配向させたポリビニルアルコール系樹脂から形成され、
ポリビニルアルコール系樹脂のケン化度は99.0モル%以下であり、
視感度補正単体透過率(Ty)が40%以上でかつ視感度補正偏光度(Py)が99.9%以上である、偏光性積層フィルム。 A base film, and a polarizer layer formed on one surface of the base film,
The polarizer layer has a thickness of 10 μm or less, and is formed from a polyvinyl alcohol resin in which a dichroic dye is adsorbed and oriented,
The saponification degree of the polyvinyl alcohol-based resin is 99.0 mol% or less,
A polarizing laminated film having a visibility corrected single transmittance (Ty) of 40% or more and a visibility corrected polarization degree (Py) of 99.9% or more. - 偏光子層が、5倍超の延伸倍率で一軸延伸されている、請求の範囲1に記載の偏光性積層フィルム。 The polarizing laminated film according to claim 1, wherein the polarizer layer is uniaxially stretched at a stretch ratio of more than 5 times.
- 偏光板に使用される、請求の範囲1または2に記載の偏光性積層フィルム。 The polarizing laminated film according to claim 1 or 2, which is used for a polarizing plate.
- 偏光子層が、プライマー層を介して基材フィルムの一方の面に形成されている、請求の範囲1~3のいずれかに記載の光性積層フィルム。 The optical laminated film according to any one of claims 1 to 3, wherein the polarizer layer is formed on one surface of the base film through a primer layer.
- 保護フィルムと、保護フィルムの一方の面に形成されている偏光子層とを備え、
偏光子層は、厚さ10μm以下であり、二色性色素を吸着配向させたポリビニルアルコール系樹脂から形成され、
前記ポリビニルアルコール系樹脂のケン化度は99.0モル%以下であり、
視感度補正単体透過率(Ty)が40%以上でかつ視感度補正偏光度(Py)が99.9%以上である、偏光板。 A protective film, and a polarizer layer formed on one surface of the protective film,
The polarizer layer has a thickness of 10 μm or less, and is formed from a polyvinyl alcohol resin in which a dichroic dye is adsorbed and oriented,
The degree of saponification of the polyvinyl alcohol-based resin is 99.0 mol% or less,
A polarizing plate having a visibility corrected single transmittance (Ty) of 40% or more and a visibility correction polarization degree (Py) of 99.9% or more. - 偏光子層が、粘着剤層または接着剤層を介して保護フィルムの一方の面に形成されている、請求の範囲5に記載の偏光板。 The polarizing plate according to claim 5, wherein the polarizer layer is formed on one surface of the protective film via an adhesive layer or an adhesive layer.
- 偏光子層が、5倍超の延伸倍率で一軸延伸されている、請求の範囲5または6に記載の偏光板。 The polarizing plate according to claim 5 or 6, wherein the polarizer layer is uniaxially stretched at a stretch ratio of more than 5 times.
- 請求の範囲1~4のいずれかに記載の偏光性積層フィルムの製造方法であって、
基材フィルムの一方の面に、ケン化度が99.0モル%以下のポリビニルアルコール系樹脂からなる樹脂層を形成して積層フィルムを得る樹脂層形成工程と、
積層フィルムを5倍超の延伸倍率で一軸延伸して延伸フィルムを得る延伸工程と、
延伸フィルムの樹脂層を二色性色素で染色して偏光子層を形成する染色工程と、を含む偏光性積層フィルムの製造方法。 A method for producing a polarizing laminated film according to any one of claims 1 to 4,
A resin layer forming step of forming a laminated film by forming a resin layer made of a polyvinyl alcohol-based resin having a saponification degree of 99.0 mol% or less on one surface of the base film;
A stretching step of obtaining a stretched film by uniaxially stretching the laminated film at a stretch ratio of more than 5 times;
A dyeing step of dyeing a resin layer of a stretched film with a dichroic dye to form a polarizer layer. - 請求の範囲5~8のいずれかに記載の偏光板の製造方法であって、
基材フィルムの一方の面に、ケン化度が99.0モル%以下であるポリビニルアルコール系樹脂からなる樹脂層を形成して積層フィルムを得る樹脂層形成工程と、
積層フィルムを5倍超の延伸倍率で一軸延伸して延伸フィルムを得る延伸工程と、
延伸フィルムの樹脂層を二色性色素で染色して偏光子層を形成し、偏光性積層フィルムを得る染色工程と、
偏光性積層フィルムにおける偏光子層の基材フィルム側の面とは反対側の面に保護フィルムを貼合して多層フィルムを得る貼合工程と、
多層フィルムから基材フィルムを剥離する剥離工程と、を含む偏光板の製造方法。 A method for producing a polarizing plate according to any one of claims 5 to 8, comprising:
A resin layer forming step of forming a laminated film by forming a resin layer made of a polyvinyl alcohol-based resin having a saponification degree of 99.0 mol% or less on one surface of the base film;
A stretching step of obtaining a stretched film by uniaxially stretching the laminated film at a stretch ratio of more than 5 times;
Dyeing the resin layer of the stretched film with a dichroic dye to form a polarizer layer, and obtaining a polarizing laminated film,
A laminating step of laminating a protective film on a surface opposite to the surface on the base film side of the polarizer layer in the polarizing laminated film to obtain a multilayer film;
And a peeling step of peeling the base film from the multilayer film.
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JP2016071370A (en) * | 2014-09-30 | 2016-05-09 | 日東電工株式会社 | One-side protected polarizing film, polarizing film with adhesive layer, image display device and method for continuously manufacturing the same |
US10094954B2 (en) | 2014-09-30 | 2018-10-09 | Nitto Denko Corporation | One-side-protected polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, image display device, and method for continuously producing same |
JPWO2017145607A1 (en) * | 2016-02-26 | 2018-08-09 | 日東電工株式会社 | Polarizer, single-protective polarizing film, polarizing film with pressure-sensitive adhesive layer, image display device, and continuous production method thereof |
US10884169B2 (en) | 2016-02-26 | 2021-01-05 | Nitto Denko Corporation | Polarizer, one-side-protected polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, image display device, and method for continuously producing same |
TWI725114B (en) * | 2016-02-26 | 2021-04-21 | 日商日東電工股份有限公司 | Polarizer, single-sided protective polarizing film, polarizing film with adhesive layer, and image display device and continuous manufacturing method thereof |
WO2017145607A1 (en) * | 2016-02-26 | 2017-08-31 | 日東電工株式会社 | Polarizer, one-side-protected polarizing film, polarizing film including adhesive layer, and image display device and method for continuously manufacturing same |
Also Published As
Publication number | Publication date |
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TWI459056B (en) | 2014-11-01 |
JP2011227450A (en) | 2011-11-10 |
CN102834748A (en) | 2012-12-19 |
KR20170018481A (en) | 2017-02-17 |
JP5048120B2 (en) | 2012-10-17 |
KR101420556B1 (en) | 2014-07-16 |
KR20140085531A (en) | 2014-07-07 |
TW201501909A (en) | 2015-01-16 |
KR101796907B1 (en) | 2017-11-10 |
CN102834748B (en) | 2016-03-16 |
KR101711265B1 (en) | 2017-02-28 |
KR20130066578A (en) | 2013-06-20 |
TW201142381A (en) | 2011-12-01 |
TWI538796B (en) | 2016-06-21 |
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