WO2001053421A1 - Radiation curable coatings having low gloss and coated articles made therefrom - Google Patents
Radiation curable coatings having low gloss and coated articles made therefrom Download PDFInfo
- Publication number
- WO2001053421A1 WO2001053421A1 PCT/US2001/001608 US0101608W WO0153421A1 WO 2001053421 A1 WO2001053421 A1 WO 2001053421A1 US 0101608 W US0101608 W US 0101608W WO 0153421 A1 WO0153421 A1 WO 0153421A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coating
- radiation
- flexible sheet
- cured
- wax
- Prior art date
Links
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- 239000003999 initiator Substances 0.000 claims abstract description 24
- 239000001301 oxygen Substances 0.000 claims abstract description 24
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- 239000000376 reactant Substances 0.000 claims abstract description 16
- 206010073306 Exposure to radiation Diseases 0.000 claims abstract description 10
- 230000000977 initiatory effect Effects 0.000 claims abstract 4
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- 239000000758 substrate Substances 0.000 claims description 22
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2809—Web or sheet containing structurally defined element or component and having an adhesive outermost layer including irradiated or wave energy treated component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2848—Three or more layers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31507—Of polycarbonate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
Definitions
- This invention relates to radiation curable coatings, especially UV curable coatings, comprising:
- These coatings are characterized in that they can produce a 60° gloss of less than 40 when the coating is cured by exposure to radiation in the presence of oxygen to provide a dry film thickness of 1.0 ⁇ 0.1 mil.
- One useful application of the radiation curable coatings is obtained by applying the coating to a substrate followed by exposure to radiation in the presence of oxygen until cured.
- One preferred application involves the use of a flexible sheet as the substrate and an especially preferred application involves a flexible sheet having a first side and a second side opposite to the first side, wherein the second side, either before or after the application and/or cure of the radiation polymerization coating, is coated with an adhesive material, and wherein the radiation curable coating is cured by exposing the applied coating to radiation in the presence of oxygen.
- the adhesive side can then be adhesively applied to any rigid or flexible substrate.
- the cured coatings of this invention are especially useful in applications where an abrasion resistant, smooth, cured surface is desirable such as in the preparation of "white boards" which can erasibly accept markings from a dry mark or dry erase writing implement.
- the coatings can be applied to any substrate and then cured by exposure to radiation thereby providing smooth, abrasion-resistant cured coatings which can erasibly accept markings from a dry erase writing implement.
- the coatings can be cured by any suitable radiation such as electron beam or visible light or, especially preferred, ultraviolet radiation. Although it is not our intent to be bound by theory, it is believed that when the coatings of this invention are cured by exposure to radiation in the presence of oxygen, the oxygen inhibits, but does not totally prevent the cure of the coating at its surface. As a result, the rate of cure is fastest at the "bottom" of the liquid coating and slowest at the surface. It is believed that as a result of this bottom-up curing mechanism that the wax is forced toward the surface of the curing film as the cure takes place. By selecting a sufficient amount of an appropriate wax, the cured coating can provide a hard, abrasion resistant, smooth finish with a high concentration of wax at or near the surface.
- suitable radiation such as electron beam or visible light or, especially preferred, ultraviolet radiation.
- the wax apparently as a result of this curing mechanism, appears to provide the dual benefit of a reduction of gloss in the coating, and a top surface of the cured film having a smooth finish which erasibly accepts the markings of dry erase writing implements.
- Sufficient cure inhibition at the surface can be provided at levels of oxygen in excess of 1 ,000 parts oxygen per 1 ,000,000 parts atmosphere. Higher levels of oxygen are also practical, and it is especially convenient to utilize regular atmospheric air.
- the coatings of this invention are applied to a planar flexible sheet having a first side and a second side opposite to the first side, wherein the second side is coated with an adhesive material, and wherein said first side is coated with a cured film of the coating of this invention which is exposed to polymerizing radiation in the presence of oxygen until cured.
- one object of this invention is to provide improved radiation curable liquid coating compositions. Another object is to provide radiation curable compositions having low gloss and a smooth, abrasion-resistant surface which can erasibly accept markings from a dry erase writing implement. A further object of this invention is to provide flexible substrates wherein at least one side of the flexible substrate is coated with the coating of this invention and, optionally, the second side is coated with an adhesive material.
- the radiation polymerizable reactants suitable for use in this invention can be any compound having polymerizable ethylenic unsaturation such as unsaturated polymers, oligomers, monomers or combinations thereof.
- Representative polymeric or oligomeric polyunsaturated compounds are well known in the art and can include, for example, unsaturated polyesters obtained by the reaction of polyols and maleic or fumaric acid, reaction products of polyacids or polyisocyanates with unsaturated alcohols, reaction products of polyepoxides and unsaturated acids such as acrylic or methacrylic acids, reaction products of polyols and unsaturated acids or esters, and other methods well known in the art.
- unsaturated monomers and/or oligomers are especially preferred in order to minimize the viscosity and provide the highest application solids of the curable coatings.
- Especially useful monomers include vinyl and allyl compounds such as styrene, vinyl acetate, vinylidene chloride, and (meth)acrylates of monohydric alcohols, acrylamides and similar (meth)acrylate acid derivatives, such as methylmethacrylate, hydroxyethyl acrylate, acrylonitrile, and acrylamide.
- alkyl di-, tri-, and poly- acrylates such as, for example, ethylene glycol diacrylate, 1,3-propylene glycol diacrylate, 1,4- butanediol diacrylate, 1 ,4-cyclohexane diacrylate, 1 ,6-hexanediol diacrylate, neopentyl glycol diacrylate, 1,5-pentanediol diacrylate, 1,8-octanediol diacrylate, trimethylol propane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, and dipentaerythritol pentaacrylate.
- unsaturated fluoronated materials such as fluoroalkyl(meth)acrylates
- monomers which exhibit a significant amount of shrinkage, or change in density as a result of their polymerization from monomers to homopolymers.
- this rapid change in density upon cure in combination with the oxygen inhibition of cure at the exposed surface of the coating, combine to force the wax to the surface of the cured polymer in order to provide the low gloss and smooth abrasion-resistant surface of the cured polymer.
- Monomers which provide a shrinkage of at least 10% or more upon curing from monomer to homopolymer are especially preferred in the practice of this invention.
- Especially preferred monomers in the practice of this invention include hexanediol diacrylate, trimethylolpropane triacrylate and tripopyleneglycol diacrylate.
- the waxes which can be utilized in the practice of this invention can be any natural or synthetic wax such as bees wax, carnauba, paraffin, chlorinated naphthalenes, polyolefins, and especially the fluoronated and/or chlorinated polyolefins such as polytetrafluoroethylene. (PTFE).
- the PTFE waxes are especially preferred in the practice of this invention due to their ability to rapidly reduce gloss, and to provide a smooth surface upon cure of the coating in the presence of oxygen.
- PTFE wax is readily commercially available and can be obtained predispersed in unsaturated monomers.
- the amount of wax incorporated into the radiation polymerizable compositions of this invention should be present in amount sufficient to reduce the 60° gloss of the cured coating to a gloss level less than 40, preferably less than 30, and most preferred less than 25, when the coating is cured by exposure to radiation in the presence of oxygen to provide a dry film thickness of 1.0 ⁇ 0.1 mil. It should be understood that the dry film
- thickness of 1.0 ⁇ 0.1 mil is utilized merely to characterize the effect of the wax and that film thicknesses of the radiation curable coating greater than or less than 1.0 mil are also practical.
- dry film thicknesses of the cured coating composition will range from about 0.1 to about 10 mils.
- the weight ratio of radiation polymerizable reactant to wax will be between 90/10 and 65/35, and preferably between 85/15 and 70/30.
- the polymerization of the curable compositions can be effected with, for example, UV light or electron beam or visible light and will typically include a suitable initiator for this cure. Polymerization is especially preferred by exposure to UV light.
- Suitable initiators include: acylphosphine oxides such as 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, benzoyldiethoxyphosphine oxide and 2,4,6-trimethylbenzoyl dinaphthyl phosphine oxide; Michler's ketone; benzil; 2-chlorothioxanthone; 2,4- diethylthioxanthone; 2,4-diisopropylthioxanthone; 2-benzyl-2-(dimethylamino)- 1 -(4-(4- morpholinyl)phenyl)-l-butanone commercially available as IRGACURE® 369; camphoroquinone and mixtures thereof.
- Additional initiators include: acyloin and derivatives thereof, such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether commercially available as VICURE-30 from Stauffer Chemicals, benzoin isobutyl ether commercially available as TRIGONAL- 14 from Noury, and methylbenzoin; diketones such as diacetyl; aromatic diketones such as anthraquinone; phenones such as acetophenone, 2,2,2-tribromo-l-phenylethanone, 2,2- diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone commercially available as
- IRGACURE® 651 from Ciba Geigy, 2,2,2-tribromo-l-(2-nitrophenyl)ethanone, benzophenone, and 4,4-bis(dimethylamino)benzophenone, 2-hydroxy-2-methyl-l-phenyl- propan-1-one commercially available as DAROCUR® 1173 from Ciba Geigy, hydroxycyclohexyl phenyl ketone commercially available as IRGACURE ® 184 from Ciba Geigy, 2-methyl-l-(4-(methylthio)phenyl)-2-morpholino-propanone-l commercially available as IRGACURE® 907 from Ciba Geigy, 2,2-dichloro-l-(4 phenoxyphenyl)ethanone commercially available as SANDORAY-1000 from Sandoz, chlorinated benzophenone aryl ketone commercially available as FI-4 from Eastman Kodak, and ⁇ -isobutyl-
- the total amount of photoinitiator present in the curable coating composition is generally in the range of about 0.05-10% by weight of the total composition, preferably between about 0.2% and about 7%. It is especially preferred in the practice of this invention to utilize a benzophenone, or substituted benzophenone, as at least part of the initiator package, usually in combination with additional initiators.
- the benzophenone is frequently used in combination with an amine synergist such as a tertiary amine.
- a particularly preferred initiator composition comprises both an alpha cleavage initiator and a hydrogen abstraction initiator.
- the curable compositions of this invention can also include additives which do not adversely effect curing of the coating. Suitable amounts of pigments, solvents, thixotropes, flow control additives, diluents, light stabilizers and other materials can be utilized. It is especially preferred in the practice of this invention to incorporate alumina or silica pigments and, in particular, the addition of colloidal silica or alumina which has been treated with an unsaturated silane or other unsaturated material to provide curable unsaturated sites on its surface is especially preferred to provide thixotropy control and improved cure. Most preferably, colloidal silica treated according to the process of U.S. Pat. No. 4,644,077 is included in the coating composition of the present invention. The treated silica will typically be present at a level of about 5 to about 40% by weight based upon the weight solids of the curable composition.
- the curable compositions of this invention may typically be applied to any substrate such as metal, plastic, wood, glass, synthetic fibers, etc. by brushing, dipping, roll coating, flow coating, spraying or other method conventionally employed in the art.
- An especially preferred substrate for the practice of this invention includes flexible planar sheets such as polycarbonate, polyester, polyacrylate, polyvinylchloride or polyolefin sheet materials. If desired, the flexible planar sheets can be metallized for reflectivity as is known in the art.
- the curable composition will be applied to the substrate typically to provide a film thickness of at least about 0.1 mil and will typically be applied between 0.1 and 10 mils dry film thickness.
- the sheet may be pigmented or transparent and may contain various additives including plasticizers, fillers, etc.
- the sheet can be provided with a surface treatment to improve adhesion.
- the sheet can be treated with an oxidizing agent, by flame treatment, or by corona discharge, or optionally could be coated with a primer prior to application of the curable coating.
- the coating can be applied to one side of the flexible sheet and exposed to suitable radiation for cure in the presence of oxygen.
- the second side of the sheet can be coated with an adhesive either before or after the application of the curable coating.
- Any suitable adhesive can be used.
- the adhesive could be a hot melt adhesive which is applied to the sheet from solution or from the melt and subsequently allowed to dry or cool on the sheet surface.
- the adhesive could be a contact adhesive which is soft and adhesive at room temperature and would include an anti-adhesive protective backing applied to the surface of the adhesive and subsequently stripped off before the sheet is adhesively applied to a substrate.
- the flexible sheet can be either immediately applied to a substrate or formed into rolls or other convenient packaging and transferred to another location for final application to a substrate.
- the curing of the coating in the presence of oxygen is completed by sufficient exposure to radiation to obtain the desired degree of cure. In the practice of this invention, it is generally not necessary to provide any additional thermal cure or subsequent exposure to radiation in the absence of oxygen in order to effectuate sufficient cure, although these steps could be taken if desired for special applications.
- the curing is accomplished by exposing the coating to suitable radiation sources such as mercury lamps, xenon lamps, argon lamps, metal halide lamps, electron beams, or other device to produce the radiation.
- Irgacure 500 from Ciba Additives - 50/50 mix of benzophenone/ 1- hydroxy cyclohexyl phenyl ketone.
- Ebercryl PI 15 amine synergist from UCB Chemicals Corp.
- This coating can be applied to a substrate and cured by exposure to UV light under atmospheric air to produce a low gloss, hard coating which erasibly accepts dry erase marker.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001229579A AU2001229579A1 (en) | 2000-01-19 | 2001-01-18 | Radiation curable coatings having low gloss and coated articles made therefrom |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US17683400P | 2000-01-19 | 2000-01-19 | |
US60/176,834 | 2000-01-19 |
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WO2001053421A1 true WO2001053421A1 (en) | 2001-07-26 |
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Family Applications (1)
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PCT/US2001/001608 WO2001053421A1 (en) | 2000-01-19 | 2001-01-18 | Radiation curable coatings having low gloss and coated articles made therefrom |
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US (2) | US6448302B1 (en) |
AU (1) | AU2001229579A1 (en) |
WO (1) | WO2001053421A1 (en) |
Cited By (3)
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US6805048B2 (en) | 2002-08-30 | 2004-10-19 | 3M Innovative Properties Company | Method of marking a substrate using an electret stencil |
WO2009002814A1 (en) * | 2007-06-22 | 2008-12-31 | Exopack-Technology, Llc | Low-gloss dry-erase coating formulation |
US9139742B2 (en) | 2007-07-12 | 2015-09-22 | Coveris Technology Llc | Low-gloss anti-graffiti surface for electronic white boards |
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BR0115471A (en) * | 2000-11-20 | 2003-08-19 | Ciba Sc Holding Ag | Fluorinated photoinitiators in dual cure resins |
US20030008095A1 (en) * | 2001-07-06 | 2003-01-09 | Meccia Mark Andrew | Repositionable flexible markerboard |
US8011299B2 (en) * | 2002-07-01 | 2011-09-06 | Inca Digital Printers Limited | Printing with ink |
AU2003256358A1 (en) * | 2002-08-30 | 2004-03-19 | 3M Innovative Properties Company | Method of making writable erasable articles and articles therefrom |
US7700707B2 (en) | 2002-10-15 | 2010-04-20 | Exxonmobil Chemical Patents Inc. | Polyolefin adhesive compositions and articles made therefrom |
KR101113341B1 (en) | 2002-10-15 | 2012-09-27 | 엑손모빌 케미칼 패턴츠 인코포레이티드 | Multiple catalyst system for olefin polymerization and polymers produced therefrom |
US20050234158A1 (en) * | 2004-04-19 | 2005-10-20 | Scott Levi F Jr | Energy-curable coating/adhesive compositions containing chlorinated polyolefins |
CN1973004B (en) * | 2004-06-10 | 2010-10-13 | 晓温-威廉姆斯公司 | Free radical curable conductive primer |
US20060029791A1 (en) * | 2004-08-04 | 2006-02-09 | Masterbrand Cabinets, Inc. | Product Comprising a Thin-film Radiation-cured Coating on a Three-dimensional Substrate |
US20060029730A1 (en) * | 2004-08-04 | 2006-02-09 | Masterbrand Cabinets, Inc. | Process for Applying a Thin-film Radiation-cured Coating on a Three-dimensional Substrate |
US7267881B2 (en) * | 2005-05-19 | 2007-09-11 | Rolf Thomas Weberg | Protective surface modification system and application to substrates |
CA2565497A1 (en) * | 2005-10-28 | 2007-04-28 | Acco Brands Usa Llc | Marker board |
US7713375B2 (en) * | 2006-08-31 | 2010-05-11 | Avery Dennison Corporation | Dry erase writing board and method |
US8105659B2 (en) * | 2008-07-11 | 2012-01-31 | Xerox Corporation | Method of controlling gloss with curing atmosphere using radiation curable ink or overcoat compositions |
BR112012019442A2 (en) * | 2010-01-26 | 2016-05-03 | 3M Innovative Properties Co | article and method |
US9000069B1 (en) | 2010-07-02 | 2015-04-07 | The Sherwin-Williams Company | Self-stratifying coatings |
US9394436B2 (en) | 2013-08-26 | 2016-07-19 | Dymax Corporation | Form in-place gasket with tack free surface |
KR101964092B1 (en) * | 2014-08-01 | 2019-04-02 | (주)엘지하우시스 | Hard coating composition containing polytetrafluoroethylene, hard coating layer and flooring including the same |
JP2021079646A (en) * | 2019-11-20 | 2021-05-27 | スリーエム イノベイティブ プロパティズ カンパニー | Laminate having inorganic nanoparticle-containing surface layer exhibiting low gloss appearance and inorganic nanoparticle-containing radiation-curable ink |
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Also Published As
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US6448302B1 (en) | 2002-09-10 |
US6787225B2 (en) | 2004-09-07 |
US20030054116A1 (en) | 2003-03-20 |
AU2001229579A1 (en) | 2001-07-31 |
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