WO1996011985A1 - Composition de resines thermoplastiques, son procede de moulage par injection et article ainsi moule - Google Patents
Composition de resines thermoplastiques, son procede de moulage par injection et article ainsi moule Download PDFInfo
- Publication number
- WO1996011985A1 WO1996011985A1 PCT/JP1995/002133 JP9502133W WO9611985A1 WO 1996011985 A1 WO1996011985 A1 WO 1996011985A1 JP 9502133 W JP9502133 W JP 9502133W WO 9611985 A1 WO9611985 A1 WO 9611985A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thermoplastic resin
- liquid crystalline
- weight
- molded article
- resin composition
- Prior art date
Links
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- 239000011342 resin composition Substances 0.000 title claims abstract description 91
- 238000002347 injection Methods 0.000 title claims abstract description 74
- 239000007924 injection Substances 0.000 title claims abstract description 74
- 238000001746 injection moulding Methods 0.000 title claims abstract description 71
- 229920000106 Liquid crystal polymer Polymers 0.000 claims abstract description 190
- 229920005989 resin Polymers 0.000 claims abstract description 102
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- 238000002844 melting Methods 0.000 claims abstract description 57
- 230000008018 melting Effects 0.000 claims abstract description 57
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 claims abstract description 55
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- 239000007788 liquid Substances 0.000 claims description 71
- -1 phosphorus compound Chemical class 0.000 claims description 45
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- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 14
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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Definitions
- the present invention relates to a thermoplastic resin composition
- a thermoplastic resin composition comprising a thermoplastic resin that does not form an anisotropic molten phase and a liquid crystalline polymer capable of forming an anisotropic molten phase, an injection molding method and an injection molded article thereof.
- the liquid crystalline polymer that can form an anisotropic molten phase is a thermoplastic resin that has many characteristics such as high strength, high rigidity, high heat resistance, and easy moldability, but it is molded in the direction perpendicular to the molecular chain orientation. It has different shrinkage and mechanical properties, and has the commercial disadvantage of high price.
- thermoplastic resins that do not form an anisotropic molten phase are relatively inexpensive, but have disadvantages in that physical properties such as heat resistance and rigidity are inferior to liquid crystalline polyester.
- the fluidity of the molten resin during production and the rigidity of the molded product are insufficient, so it is inevitable that the thickness must be increased by design. There was a limit in responding to miniaturization in the field of equipment.
- thermoplastic resin and the liquid crystalline polymer are simply Even if a thermoplastic resin composition that has just been blended is molded, the thermoplastic resin is matrix This is because most liquid crystalline polymers have a form that does not have a reinforcing effect just because they are dispersed spherically.
- the molding material When molding a molded body, the molding material contains a fibrous liquid crystalline polymer that has a reinforcing effect by being molded at a temperature at which only the thermoplastic resin melts without melting the liquid crystalline polymer.
- a method of producing a molded body to be formed has been considered.
- the extrudate is extruded while being stretched in advance, and the molten extrudate is further stretched by a roller or the like to form a composition in which the liquid crystalline polymer is oriented in a fibrous state.
- a molded article is obtained, it is molded at a molding temperature lower than the melting point of the liquid crystalline polymer.
- a considerably large shearing force must be applied when the resin composition is filled in a mold to orient the liquid crystalline polymer. Therefore, in the former case, the fluidity is deteriorated, the molding conditions are narrowed, and the rigidity of the obtained molded body is not sufficiently satisfactory. In the latter case, the shape of the molded body is restricted, and the strength is insufficient due to insufficient orientation in some places. Disclosure of the invention
- the present inventors have intensively searched and studied materials having excellent properties as a thin-walled molding material, and found that a thermoplastic resin and a liquid crystal polymer were used, and the liquid crystal polymer was a thermoplastic resin matrix. It is extremely important to use a composition dispersed in a specific state in a phase for injection molding, and also specify the conditions during the injection molding. By doing so, the liquid crystalline polymer easily becomes fibrous and exhibits an unprecedentedly high reinforcing effect.Therefore, the properties of the obtained molded product are unique, and a thin molded product having particularly excellent mechanical strength can be obtained. They have found and completed the present invention.
- thermoplastic resin (A) that does not form an anisotropic molten phase (99) to 50% by weight and the liquid crystalline polymer (B) 1 to 5 that can form an anisotropic molten phase
- a thermoplastic resin composition comprising 0% by weight (total 100% by weight of both), wherein the thermoplastic resin composition is subjected to no load under a temperature condition not lower than the melting point of the liquid crystalline polymer ( ⁇ ).
- the liquid crystalline polymer ( ⁇ ) force the weight average particle diameter is in the range of 10 to 40 m, and 80% by weight or more of the liquid crystal polymer has a particle diameter of 0.5 to 60 m.
- a thermoplastic resin composition characterized by being micro-dispersed in the form of islands in the matrix phase of the thermoplastic resin (A).
- thermoplastic resin composition is provided, wherein the ratio (A 77 ZB 77) is 0.1 or more.
- thermoplastic resin composition wherein the viscosity ratio ( ⁇ ? ⁇ ? ⁇ ) is 0.1 or more and 6 or less.
- thermoplastic resin composition wherein the thermoplastic resin ( ⁇ ) is a polyester resin.
- thermoplastic resin composition wherein the thermoplastic resin ( ⁇ ) is a polycarbonate resin.
- thermoplastic resin composition wherein the thermoplastic resin ( ⁇ ) is a mixture of a polycarbonate resin and an ABS resin. Further, according to the present invention, there is provided the thermoplastic resin composition, wherein the thermoplastic resin (A) is a mixture of a polycarbonate resin and a polyalkylene terephthalate resin and / or an amorphous polyarylate resin. You. According to the present invention, there is provided the thermoplastic resin composition, wherein the thermoplastic resin (A) is a polyarylene sulfide resin.
- the phosphorous compound is characterized in that the total content of the thermoplastic resin (A) and the liquid crystalline polymer (B) is 0.1 to 0.5 times the total of 10 O fi ⁇ parts;
- the thermoplastic resin composition described above is provided.
- thermoplastic resin composition for injection molding.
- the thermoplastic resin composition is processed at a processing temperature equal to or higher than the flow start temperature of the liquid crystalline polymer (B), and a molten resin passes through a gate at a speed of 50 OmZ minutes or more.
- An injection molding method characterized by performing injection molding under the following conditions is provided.
- thermoplastic resin composition is processed under the condition that the molten resin passes through a gate at a speed of 50 Om / min or more at a processing temperature higher than the melting point of the liquid crystalline polymer (B). And an injection molding method characterized by performing injection molding.
- thermoplastic resin composition is processed at a processing temperature at a temperature equal to or higher than the flow start temperature of the liquid crystalline polymer (B) and lower than the melting point, and the molten resin passes through the gate at a speed of 500 mZ min or more.
- An injection molding method characterized by performing injection molding under the following conditions:
- the thermoplastic resin composition is processed at a processing temperature equal to or higher than the flow start temperature of the liquid crystalline polymer (B) and under a condition that a gate passage speed of the molten resin is in a range of 500 minutes or more.
- a processing temperature equal to or higher than the flow start temperature of the liquid crystalline polymer (B) and under a condition that a gate passage speed of the molten resin is in a range of 500 minutes or more.
- an injection molding method characterized by using an injection mold having a ratio S RZ S C of a cross section area S R of the runner to a cross section area S G of the gate in the range of 3 to 150. .
- the liquid crystalline polymer (B) has a weight-average diameter of 10 to 40 #m when cooled through a heat treatment at a temperature not lower than the melting point, and 80% by weight or more of the liquid crystal polymer (B) has a particle diameter of 0.5.
- An injection-molded article characterized in that it is micro-dispersed in an island form in the matrix phase of the thermoplastic resin (A) so as to be within a range of from 60 m to 60 m.
- the viscosity ratio n of the thermoplastic resin (A) and the liquid crystal polymer (B) when the shear rate is 1200 sec- 1 at a processing temperature equal to or higher than the flow start temperature of the liquid crystal polymer (B) is n
- the injection molded article is provided, wherein / B r is 0.1 or more.
- the above-described injection molded body wherein the viscosity ratio (AB) is 0.1 or more and 6 or less.
- thermoplastic resin (A) is a polyester resin.
- the polyester resin is a polycarbonate resin.
- thermoplastic resin (A) is a mixture of a polycarbonate resin and an ABS resin.
- thermoplastic resin (A) is a mixture of a polycarbonate resin and a polyalkylene terephthalate resin and / or an amorphous polyarylate resin.
- thermoplastic resin (A) is a polyarylene sulfide resin.
- a phosphoric compound is contained in an amount of 0.01 to 0.5 weight: S part based on a total of 100 parts by weight of the thermoplastic resin (A) and the liquid crystal polymer (B).
- An injection molded article is provided.
- the thermoplastic resin (A) which does not form an anisotropic molten phase (99) to 50% by weight and the liquid crystalline polymer which can form an anisotropic molten phase (B) 1 to 50% by weight % (Total 100% by weight of both) is an injection molded article of a thermoplastic resin composition, wherein the liquid crystalline polymer (B) is a fibrous thermoplastic resin (A) having an average aspect ratio of 6 or more.
- the liquid crystalline polymer (B) has a weight-average diameter of 10 to 10 when the injection-molded product is cooled under no load by melting under a temperature condition equal to or higher than the melting point of the liquid crystalline polymer (B). It is micro-dispersed in the form of islands in the matrix phase of thermoplastic resin (A) so that it is in the range of 40 m and 80% i% or more of it is in the range of 0.5 to 60 ⁇ m in particle size.
- the flexural modulus of the molded body measured according to ASTM D 790 is 40, OO Ok gZcm 2 or more.
- An injection-molded article characterized in that the melt viscosity measured at a temperature 20 higher than the melting point of (B) and a shear rate of 1200 sec- is in the range of 400 to 2,500 boise.
- thermoplastic resin (A) is a polycarbonate resin.
- the above-mentioned injection-molded article which is a thin-walled molded article in which 50% or more of the thickness of the molded article is 1 mm or less.
- injection-molded article which is a z, housing of an electronic device.
- the electronic device is any one of a personal computer, a mobile phone, a connector, a CD pickup component, a hard disk, and a peripheral component thereof.
- thermoplastic resin (A) to which the present invention is applied includes, for example, polyolefin-based (co) polymers such as polyethylene, polypropylene, and poly (4-methyl-1-pentene); and polyalkylenes such as polyethylene terephthalate and polybutylene terephthalate.
- polyolefin-based (co) polymers such as polyethylene, polypropylene, and poly (4-methyl-1-pentene)
- polyalkylenes such as polyethylene terephthalate and polybutylene terephthalate.
- - ⁇ -terephthalate (co) polymer polycarbonate (co) polymer, amorphous polyester resin such as polyester resin, polyamide (co) polymer, ABS resin, polyarylene sulfide (co) ) Polymers, polyacryl acrylates, polyacetal (co) polymers and resins mainly composed of these resins, or copolymers composed of single S-forms that constitute tiria (co) polymers , May be used alone or in combination of two or more.
- a polycarbonate resin such as a polycarbonate resin, a polybutylene terephthalate resin, or a polyethylene terephthalate resin, or a polyarylene sulfide resin is preferable.
- a mixture of a polycarbonate resin and an ABS resin and a mixture of a polycarbonate resin, a polyalkylene terephthalate resin, and a non- or amorphous polyarylate resin are preferable in terms of cost and balance of physical properties such as specific gravity, fluidity, and bending characteristics.
- a typical example of the amorphous polyarylate includes a mixture of bisphenol A and terephthalanolic acid Z-isophthalic acid.
- additives such as nucleating agent, pigment such as carbon black, antioxidant, stabilizer, plasticizer, lubricant, mold release agent and flame retardant Is also included in the scope of the thermoplastic resin of the present invention.
- the liquid crystalline polymer (B) refers to a melt-processable polymer that has the property of forming an optically anisotropic molten phase. When subjected to shear stress in the molten state, the polymer molecular chains take a regular parallel arrangement. Has properties. Such polymer molecules are generally elongated, flat, and have considerable rigidity along the long axis of the molecule, and typically have multiple chain-extended bonds in a coaxial or parallel t-shift relationship. It is a polymer like having.
- the properties of the anisotropic molten phase can be confirmed by a conventional polarization inspection method using an orthogonal polarizer. More specifically, the anisotropic molten phase is confirmed by using a Leitz polarization microscope and observing the molten sample placed on the Leitz hot stage at a magnification of 40 times under a nitrogen atmosphere. m can.
- the liquid crystalline polymer applicable to the present invention when inspected between crossed polarizers, usually exhibits -&-Transmitted and optically anisotropic.
- the liquid crystal polymer (B) as described above is not particularly limited, but is preferably an aromatic polyester or an aromatic polyesteramide, and the aromatic polyester or the aromatic polyesteramide in the same molecular chain. Polyesters that are partially included are within the scope. These are preferably at least about 2.0 d 1 when dissolved in pentafluorophenol at 60% by weight of about 0.1, more preferably from 2.0 to: 10.0 dl. Those with viscosity (I.V.) are used
- the aromatic polyester or aromatic polyester amide as the liquid crystalline polymer (B) applicable to the present invention is particularly preferably at least one selected from the group consisting of aromatic hydroxycarboxylic acid, aromatic hydroxyamine and aromatic diamine.
- aromatic dicarboxylic acids alicyclic dicarboxylic acids, and derivatives thereof.
- (4) mainly (a) one or more aromatic hydroquincarboxylic acids and derivatives thereof, and (b) one or more aromatic hydroxyamines, aromatic diamines and derivatives thereof (C) one or more of aromatic dicarboxylic acids, alicyclic dicarboxylic acids and derivatives thereof, and (d) at least one of aromatic diols, alicyclic diols, aliphatic diols and derivatives thereof or Polyester amides composed of two or more of the following. Further above components If necessary, a molecular i regulator may be used in combination.
- Preferred examples of specific compounds constituting the liquid crystalline polymer (B) applicable to the present invention include aromatic hydroxycarboxylic acids such as p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid; Aromatic diols such as dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 4,4'-dihydroxybiphenyl, hydroquinone, resonoresin, and compounds represented by the following general formulas [1] and [2]; Aromatic dicarboxylic acids such as acid, isophthalic acid, 4,4'-diphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid and the compound represented by the following general formula [3]: p-aminophenol, p-aminophenol And aromatic amines such as phenylenediamine.
- aromatic hydroxycarboxylic acids such as p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid
- Aromatic diols
- X is a group selected from alkylene having 1 to 4 carbon atoms, alkylidene, one 0—, one SO—, one SO * —, one S—, one CO—,
- Y is 1 (CH 2 ) — (n is an integer of 1 to 4), 1 0 (CH 0 — (m is 1 to 4)
- the particularly preferred liquid crystalline polymer (B) to which the present invention is applied is an aromatic polyester containing p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid as constituent unit components.
- the first thermoplastic resin composition of the present invention comprises the thermoplastic resin (A) and a liquid crystalline polymer (B).
- the former is 99 to 50 weight: i%, preferably 90 to 75 weight%, and the latter is 1 to 50 weight Jt%. It is preferably from 10 to 35% by weight (the total of both is 100% by weight).
- the composition ratio of the liquid crystalline polymer (B) is in the range of 1 to 50% by weight, the matrix phase does not reverse, and the thermoplastic resin (A) can be reinforced with the liquid crystalline polymer (B). Becomes Further, the composition was subjected to a heat treatment under a temperature condition not lower than the melting point of the liquid crystalline polymer under no load and cooled to room temperature. When the resulting composition was observed, the liquid crystalline polymer (B) was a thermoplastic resin. (A) It is necessary that the matrix phase is micro-dispersed in the matrix phase.
- the dispersion state of the liquid crystalline polymer-(B) is in the range of 10 to 4 in weight average particle diameter, particularly preferably in the range of 15 to 30 m, and 80% by weight of the liquid crystalline polymer (B).
- the above is in the range of 0.5 to 60 m, preferably in the range of 5 to 50 m.
- the above-mentioned heat treatment is a means for making the liquid crystalline polymer (B) force, observe even if dispersed in a shape other than a spherical shape, to make it a spherical shape, and the heat treatment temperature is not less than the melting point of the liquid crystalline polymer (B).
- the heat treatment temperature is not less than the melting point of the liquid crystalline polymer (B).
- the heat treatment time may be extended, but if the heat treatment time is prolonged, melting may occur depending on the combination of the thermoplastic resin (A) and the liquid crystal polymer (B). Since the spherical liquid crystalline polymer (B) force ⁇ coagulation and its microdispersion state may change, it is preferable to use a spherical particle diameter without extending the heat treatment time.
- thermoplastic resin composition in which the liquid crystalline polymer (B) is micro-dispersed in the matrix phase of the thermoplastic shelf (A) in the form of islands when cooled after the heat treatment as described above, What is necessary is just to mix and knead in the said composition ratio. Usually, it is kneaded with an extruder, extruded into a pellet, and used for the next injection molding. -il-It is not limited to kneading. As the kneading method, a single-screw or twin-screw extruder used for kneading and extruding a usual thermoplastic resin is used.
- thermoplastic resin composition (1) Melt viscosity ratio of thermoplastic resin (A) and liquid crystalline polymer (B) as measured at a processing temperature above the flow start temperature of liquid crystalline polymer (B) and a shear rate of 1200 sec- 1 (AJ-ZB; Is adjusted to 0.1 or more, preferably 0.1 or more to 6 or less, (2) a method using a dispersion aid of the liquid crystalline polymer (B), (3) a method of repeating kneading and extrusion, (4) There is a method in which the liquid crystalline polymer (B) to be compounded is previously made into fine particles, and the method can be appropriately selected, or two methods can be used in combination.
- (1) a method of setting the melt viscosity ratio to a specific IS range, and (2) a liquid crystalline polymer (B) Is preferred. If the melt viscosity ratio in (1) is less than 0.1, the viscosity of the matrix (thermoplastic resin) phase is too low, so that the liquid crystal polymer (B) does not have sufficient shear stress and extension stress, and the liquid crystal polymer has fibers. It is hard to change.
- thermoplastic resin (A) When the viscosity ratio exceeds 6, the liquid crystalline polymer (B) turns into an arrowhead, but the viscosity of the thermoplastic resin (A) increases, so the fiber diameter of the stayed liquid crystalline polymer becomes thicker and reinforced. It is not preferable because problems such as poor operation efficiency and poor fluidity during molding may occur. Further, it is preferable to use a dispersing aid such as (2) as (B) an aromatic polyester or an aromatic polyester amide as a liquid crystal polymer, especially the former, and a thermoplastic resin. Examples of (A) include a combination using a polycarbonate resin.
- the flow start temperature of the liquid crystalline polymer (B) is measured by a method described below at a temperature at which the liquid crystalline polymer (B) exhibits fluidity due to an external force when the liquid crystalline polymer (B) is heated and heated.
- a phosphorus compound is preferable, and examples thereof include phosphides, phosphoric acid compounds, and phosphite compounds. Tetrakis (2,4-di-tert-butylphenyl) -4,4′-biphenylenephosphine Phyto, bis (2,4,6-tri-t-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-t-butyl) Examples thereof include ruthenium 4-methylphenyl) pentaerythritol diphosphite and tris (2,4-di-t-butylphenyl) phosphite, and the like, but phosphite compounds are preferable, and pentaerythritol type phosphorous compounds are particularly preferable. .
- the dispersing aid, especially the compounding amount of the phosphorus compound is preferably from 0.01 to 0.5 part by weight, based on 100 parts
- thermoplastic resin composition according to the first aspect of the present invention requires that the liquid crystalline polymer (B) be micro-dispersed to the extent described above when cooled through heat treatment.
- Japanese Patent Application Laid-Open No. HEI 5-111709-A liquid crystal polymer (B) may be fibrous in the composition as disclosed in JP-A-5-77000. No such fiberization is necessary. Therefore, it is not necessary to maintain the orientation by roll stretching performed during melting after the extruder, as described in the above publication.
- the liquid crystalline polymer (B) force ⁇ fj
- the thermoplastic resin composition in the dispersed state is injection-molded under the conditions described below, whereby the particles of each liquid crystalline polymer (B) dispersed in the mouth are dispersed.
- the fiber is easily formed into a fiber with a high aspect ratio, fibers are uniformly formed in the injection molded body, and the composition ratio of the same liquid crystalline polymer (B) is smaller than that of a molded body obtained by a known method. Thus, high strength and high rigidity can be easily achieved.
- the second injection molding method of the present invention will be described. Using the thermoplastic resin composition in which the liquid crystalline polymer (B) as described above is micro-dispersed in the matrix phase of the thermoplastic resin (A), the injection molding conditions described below are adopted, This is a distinctive feature of the injection molding method.
- the first of the injection molding conditions is that the temperature (processing temperature) of the thermoplastic resin composition at the time of injection is set to be equal to or higher than the flow start temperature of the liquid crystalline polymer (B), preferably equal to or higher than 10 degrees higher than the flow start temperature. It is to be. Due to this temperature condition, during injection molding, the thermoplastic resin composition in the flow state passes through the gate leading to the mold cavity of the injection molding machine. At the time of stretching, the liquid crystalline polymer (B), which is micro-dispersed in an island shape, is drawn in the matrix phase of the thermoplastic resin (A), and is sufficiently fiberized. In other words, by the fiberization, the dispersed state sufficiently functions, and an injection molded article having high rigidity and high strength can be obtained.
- the liquid crystalline polymer (B) dispersed in the form of islands is not micro-dispersed, the number of the liquid crystalline polymer (B) to be maintained is reduced, and an injection molded article having high rigidity and high strength is obtained. It is an important requirement that the liquid crystalline polymer (B) is dispersed in the form of islands in the form of islands.
- the upper limit of the resin temperature is preferably equal to or lower than the thermal decomposition temperature of the liquid crystalline polymer (B), particularly preferably 50 ° C. from the viewpoint of energy saving and preventing thermal decomposition of the thermoplastic resin composition. To below.
- the processing temperature of a composition with a resin having a melting point similar to that of a liquid crystal polymer, such as a polyarylene sulfide resin, is preferably at or above the melting point, but is generally a thermoplastic resin, for example, a polybutylene terephthalate resin. Since the upper limit of the processable temperature of the liquid crystal polymer is near the melting point of the liquid crystal polymer, the upper limit of the liquid crystal polymer temperature must be higher than the flow start temperature (liquid crystal start temperature) and lower than the melting point to suppress the decomposition of the thermoplastic resin. Processing is preferred.
- the processing temperature in the present invention is a set temperature of a resin processing machine such as a molding machine. However, even if the set temperature is equal to or lower than the flow start temperature (liquid crystal start temperature), it is included in the present invention if the resin temperature is equal to or higher than the flow start temperature (liquid crystal start temperature).
- the second of the injection molding conditions is the speed of the molten thermoplastic resin composition passing through the gate.
- the passing speed of this gate is at least 500 m / min, preferably at least 1, OOO mZ, more preferably at least 3, OOO mZ.
- the ratio SRZSC is 3 to 5 0 in the range of the cross-sectional area S the cross-sectional area of the runner one for G S R of the gate, is that there in particular 6 to 1 2 0 range It is particularly preferable because it promotes the fibrous formation of the liquid crystalline polymer (B) and can increase the aspect ratio of the fibrous material generated in the matrix phase.
- the cross-sectional area of the gate and the runner is defined as shown in Fig. 1 depending on the type of the gate. A gate having a shape not shown can be similarly defined. Side gate and off Irumugeto in FIG. 1 (a), in the case of overlapping the gate of FIG.
- the conical runner Let S R be the area of the cone bottom surface, and SG be the area of the imaginary cylindrical outer peripheral surface formed directly below the cone bottom surface, and in the case of the disc gate shown in Fig. 1 (e), the area of the cone bottom surface shown in the figure. the S and R, also the area of the outer peripheral surface of a virtual cylinder is formed in the gate of Figure as in the case of the direct gate Bok and Sc.
- the injection molded article obtained by the injection molding method is a fibrous thermoplastic resin (A) having a liquid crystalline polymer (B) having an average aspect ratio of 6 or more, preferably 8 or more. ) Is dispersed in the matrix phase. Further, the fibrous liquid crystalline polymer (B) is relaxed through a heat treatment under a temperature condition not lower than the melting point of the liquid crystalline polymer (B) with no load, and the fibrous liquid crystalline polymer (B) is cooled to room temperature.
- thermoplastic resin (A) is such that the liquid crystalline polymer (B) has a weight average particle size in the range of 10 to 40 / zm and more than 80 weight 6 in the range of 0.5 to 6
- the major feature is that the matrix phase is micro-dispersed in an island shape. Heating in this case
- the treatment temperature and the holding time are the same as those of the first thermoplastic resin composition of the present invention.
- the liquid crystallinity observed when the thermoplastic resin composition according to the first aspect of the present invention described above is cooled through a heat treatment at a temperature equal to or higher than the melting point of the liquid crystalline polymer (B) with no load.
- the dispersed state of the polymer (B) itself does not substantially change even if it is re-kneaded under the above-mentioned injection molding conditions and passed through the gate. Therefore, the injection-molded product is subjected to the heat treatment as described above, and the liquid-crystalline polymer is obtained.
- the dispersion state of (B) it is possible to easily determine whether the injection molded article according to the third aspect of the present invention is used, and whether or not the thermoplastic resin composition is used as a raw material thereof. it can.
- the injection molded articles according to the third aspect of the present invention particularly preferably, as the fourth aspect of the present invention, those having a flexural modulus of 40,000 kg / cm 2 or more measured according to ASTM D790.
- this value is in the above range reflects the concept of micro-dispersion of the liquid crystalline polymer and the degree of the reinforcing effect due to fiberization.If there is no such bending elastic modulus, it can be used for a housing. It will be difficult.
- the upper limit is not particularly limited, it is usually 150,000 kgZcm 2 or less.
- the preferred injection molded article is easy to mold because of its good fluidity when it is injection molded and manufactured, but this remelts the injection molded article, and the liquid crystal polymer has a melting point plus 10 temperature, shearing. It is characterized by a melt viscosity measured under the conditions of a speed of 1200 sec- 'in the range of 400 to 2500 boise, especially 500 to 1500 boise. Therefore, in order to efficiently manufacture an injection molded article, it is preferable that the viscosity when the product is re-melted be within the above range.
- the preferred injection molded article has excellent mechanical properties even when it is thin. Therefore, especially when the thickness is 50% or more, and more than 70% or more is a thin-walled product having a thickness of 1 mm or less, the effect is maximized.
- a thin injection molded article include a housing of an electronic device, and in particular, it is preferably any one of a component, a component, a mobile phone, a connector, a CD pickup component, a hard disk, and a peripheral component thereof. T.
- thermoplastic resin (A) which does not form the anisotropic molten phase exemplified above and the liquid crystalline polymer (B) which can form the anisotropic molten phase exemplified above can be used.
- thermoplastic resin composition having a special combination the following are provided.
- thermoplastic resin composition an injection molding method similar to that described in detail above and an injection molded article obtained by the same are provided.
- thermoplastic resins (A) one or more of polyolefin (co) polymer, styrene (co) polymer, polyamide (co) polymer, polyacrylate, and polyacetal (co) polymer
- the thermoplastic resin ( ⁇ ') used is relatively inexpensive and has slidability.
- the disadvantage of t is that it has excellent impact properties and its physical properties such as heat resistance and rigidity are inferior.
- the fluidity of the molten resin during manufacturing and the rigidity of the molded body are insufficient, so the design must be made thicker. There was a limit in responding to the miniaturization and lightening in the field.
- thermoplastic resin ( ⁇ ′) may decompose during processing, and the advantage inherent in the thermoplastic resin ( ⁇ ') is inherent.
- thermoplastic resin composition composed of a special combination of the thermoplastic resin ( ⁇ ′) and the liquid crystal polymer ( ⁇ ′).
- one or more polyolefin (co) polymer, styrene (co) polymer, polyamide (co) polymer, polyacrylate, polyacetal (co) polymer are used.
- a thermoplastic resin composition comprising the obtained liquid crystalline polymer ( ⁇ ′) in an amount of 1 to 50% by weight (100% by weight in total), wherein the thermoplastic resin composition has the above-mentioned temperature under the processing temperature conditions.
- thermoplastic resin ( ⁇ ') has a menoleto flow (MFR) value of 0.15 to 100, and the thermoplastic resin composition is subjected to no load under a temperature condition not lower than the melting point of the liquid crystalline polymer ( ⁇ ').
- MFR menoleto flow
- the thermoplastic resin composition is subjected to no load under a temperature condition not lower than the melting point of the liquid crystalline polymer ( ⁇ ').
- -]-So that the rimer ( ⁇ ') has a weight average particle size in the range of 10 to 40 um and 80% by weight or more thereof has a particle size in the range of 0.5 to 60 i / m.
- thermoplastic resin composition characterized by being dispersed in the form of islands in the matrix phase of the thermoplastic resin ( ⁇ ') in an island shape.
- thermoplastic resin composition when at flow temperature above the processing temperature of the shear rate of 1 2 0 0 sec one 1 (Alpha') and liquid crystal polymer (beta ': ), Wherein the viscosity ratio ( ⁇ ' ⁇ / '7?) Of the thermoplastic resin composition is 0.1 or more.
- thermoplastic resin composition wherein the liquid crystalline polymer ( ⁇ ′) is composed of a structural unit of aromatic hydroxycarboxylic acid / aliphatic diolno aromatic dicarboxylic acid.
- the liquid crystalline polymer ( ⁇ ′) is composed of units similar to aromatic ethylene carboxylic acid ethylene glycol and terephthalic acid, and the content of the aromatic hydroxy carboxylic acid is 0.30 to 70.
- the thermoplastic resin composition according to the present invention is characterized in that the composition is mol%.
- thermoplastic resin composition wherein the aromatic hydroxycarboxylic acid is ⁇ -hydr ⁇ -xybenzoic acid.
- thermoplastic resin composition comprising aromatic hydroxycarboxylic acid, ', ⁇ -hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid.
- thermoplastic resin composition is processed at a processing temperature equal to or higher than the flow start temperature of the liquid crystalline polymer ( ⁇ ′), and the molten resin passes through the gate at a speed of 50 OmZ minutes or more.
- the present invention provides an injection molding method for a thermoplastic resin composition, characterized by performing injection molding under the following conditions.
- the thermoplastic resin composition is processed at a processing temperature equal to or higher than the flow start temperature of the liquid crystalline polymer ( ⁇ ′) and under a condition that the molten resin passes through the gate at a speed of 50 OmZ min or more.
- the ratio of the runner's cross-sectional area S »to the gate cross-sectional area S c S RZ SC An injection molding method for the thermoplastic resin composition, characterized by using an injection mold in the range of 3 to 150.
- the liquid crystalline polymer comprises the thermoplastic resin composition according to any one of the above, and has a fibrous state having an average aspect ratio of 6 or more in a matrix phase of the thermoplastic resin ( ⁇ ′).
- the thermoplastic resin ( ⁇ ') has a weight average particle diameter in the range of 10 to 40 i / m and 80% by weight or more of the resin has a particle diameter in the range of 0.5 to 60.
- thermoplastic resin ( ⁇ ′) examples include polyolefin-based (co) polymers such as polyethylene, polypropylene, and poly (4-methyl-11-pentene), and styrene-based (co) polymers such as ABS resin, AES, AS, and PS. Examples thereof include coalesced, polyamide (co) polymers, polyacrylates, polyacetal (co) polymers, and resins mainly composed of these resins, and may be used alone or in combination of two or more.
- polyolefin-based (co) polymers such as polyethylene, polypropylene, and poly (4-methyl-11-pentene
- styrene-based (co) polymers such as ABS resin, AES, AS, and PS. Examples thereof include coalesced, polyamide (co) polymers, polyacrylates, polyacetal (co) polymers, and resins mainly composed of these resins, and may be used alone or in combination of two or more.
- thermoplastic resins are preferable.
- polyolefin-based (co) polymers are very inexpensive and have a good balance of physical properties, while styrene-based (co) polymers have molding shrinkage force.
- Polyamide-based (co) polymers have relatively good heat resistance, and polyacetal (co) polymers have good sliding properties.
- the polymer has a melting point or softening point of 210 or less. Further, these thermoplastic resins ( ⁇ ') will be described in detail.
- the polyaceter sole resin is a polymer compound having an oxymethylene unit-(OCH 2 )-as a main structural unit, a polyoxymethylene homopolymer or an oxymethylene group as a main repeating unit, and other structural units,
- copolymers, terpolymers and block polymers containing small amounts of comonomer units such as ethylene oxide, 1,3-dioxolan, 1,4-butanediole, and formal Either one may be used, and it may have not only a molecular force line shape but also a branch or bridge structure.
- a known modified polyoxymethylene into which another organic group has been introduced may be used.
- the degree of polymerization is not particularly limited, and it has moldability.
- the melt flow value under a load of 190 and 210 g is 0.15 to: 100 g
- the time may be 0 minutes, preferably 0.5 to 50 g Z10 minutes.
- polystyrene (co) polymer examples include homopolymers of ⁇ -olefin such as ethylene, propylene, butene, hexene, octene, nonene, decene, and dodecene, or random, block, or two or more of these. Graft copolymers or non-conjugated gens such as 1,4-hexadiene, dicyclopentadiene, 5-ethylidene-12-norbornene, 2,5-norbornadiene, butadiene, isoprene, piperylene, etc.
- ⁇ -olefin such as ethylene, propylene, butene, hexene, octene, nonene, decene, and dodecene, or random, block, or two or more of these.
- Graft copolymers or non-conjugated gens such as 1,4-hexadiene, dicyclopentadiene, 5-ethy
- a conjugated diene component, ⁇ such as acrylic acid and methacryloleic acid; a derivative such as 5-unsaturated acid or its ester, an aromatic vinyl compound such as acrylonitrile, styrene, ⁇ -methylstyrene, or a vinyl ester such as vinyl acetate; Vinyl ethers such as vinyl methyl ether and vinyl compounds of these Random, block, or graft copolymers containing one or more of the comonomer components such as the derivatives of the above.Depending on the degree of polymerization, the presence or absence and degree of side chains and branches, the copolymer composition ratio, etc. What,
- the styrenic (co) polymer is mainly composed of styrene and is obtained by a radical polymerization reaction or an ionic polymerization reaction. Industrially, it is obtained by bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, or the like. Any of those obtained can be used. In addition, as long as its properties are not significantly impaired, styrene may be the main component, and other reactive monomers such as vinyl compounds and gen-based compounds may be copolymerized, or a rubber component may be introduced.
- polystyrene, poly- ⁇ -methylstyrene, or a copolymer mainly containing these materials such as acrylic acid, methacryloleic acid, or an ester thereof, acrylonitrile, butadiene, ethylene chloride, or the like is also preferably used. It does not matter whether or not there are side chains or branches, the degree of copolymerization, the copolymer composition ratio, and the like.
- PS, HIPS. AS, AES, ABS, MBS, etc. are listed.
- boriamid-based (co) polymer examples include a polyamide obtained from ⁇ -amino acid or ⁇ -lactam, or diamine or m-xylenediamine and adipic acid, sebacic acid, dodecandionic acid, cyclohexanedicarboxylic acid, A homopolymer or a copolymer obtained from a dicarboxylic acid such as terephthalic acid or isophthalic acid, and a mixed polymer.
- Preferred polyamides include homopolymers such as nylon 6, nylon 11, nylon 12, nylon 46, nylon 66, and the like, and adipic acid Z terephthalic acid / hexamethylene diamine, adipic acid 1,4 -Cyclohexanedicarboxylic acid hexamethylenediamine, adipic acid / 1.3-cyclohexanedicarboxylic acid hexamethylenediamine, terephthalic acid / isoisophthalic acid Z hexamethylenediamine / paraaminocyclohexylmethane, etc. And a copolymerized polyamide of the following.
- thermoplastic resin Nucleating agents, pigments such as carbon black, antioxidants, stabilizers, plasticizers, lubricants, plasticizers, flame retardants, and other additives are added to these thermoplastic resins to obtain desired properties.
- the thermoplastic resin provided with is also included in the range of the thermoplastic resin ( ⁇ ′).
- the explanatory power of the liquid crystalline polymer ( ⁇ ) described above ⁇ ⁇ ⁇ the force that can be applied as it is', in which optical differences with a flow onset temperature of 80 to 210 It refers to a melt-processable polymer having the property of forming an isotropic molten phase.
- the liquid crystalline polymer ( ⁇ ′) from the viewpoint of a flow starting temperature of 80 to 210, aromatic aromatic carboxylic acid, ethylene glycol, and terephthalic acid are constituent units. Group polyester.
- the content of the aromatic hydroxycarboxylic acid is 30 to 70 mol6, preferably 35 to 55 mol%, particularly preferably 40 to 45 mol%, based on all the constituent monomers.
- the aromatic hydroxycarboxylic acid is ⁇ -hydroquinbenzoic acid or a mixed structure of ⁇ -hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid.
- the molar ratio of ⁇ -hydroxybenzoic acid to 6-hydroxy-2-naphthoic acid is preferably 50:50 to 0:30, and the molar ratio is particularly preferably 55:45 to 6 5: 3 5 power is good.
- the liquid crystalline polymer ( ⁇ ′) of the present invention is obtained by any of the above compositions
- the degree of polymerization of the substance may be L, including the oligomer region.
- the former is 99 to 50% by weight, preferably 95 to 60% by weight, the latter is 1 to 50% by weight, Preferably, it is 5 to 40% by weight (the total of both is 100% by weight).
- the composition ratio of the liquid crystalline polymer ( ⁇ ') is in the range of 1 to 50 times i1 ⁇ 2, the matrix is compatible, there is no inversion, and the thermoplastic resin ( ⁇ ') based on the liquid crystalline polymer ( ⁇ ') ) Reinforcement power is possible.
- the composition was subjected to a heat treatment under a temperature condition not lower than the melting point of the liquid crystalline polymer with no load, and cooled to room temperature.
- the liquid crystalline polymer ( ⁇ ′) was found to be thermoplastic. It is ⁇ that the resin ( ⁇ ') is micro-dispersed in the form of islands in the matrix phase.
- the dispersion state of the liquid crystalline polymer ( ⁇ ′) is in the range of 10 to 40 m in weight average particle diameter, particularly preferably in the range of 15 to 30 m. 80% by weight or more is in the range of 0.5 to 60 m, preferably in the range of 5 to 50 izm.
- the lit self-heating treatment is a means to make it easy to observe even if it is dispersed in a shape other than liquid crystalline polymer ( ⁇ '), and to make it spherical.
- the heat treatment temperature is liquid crystalline polymer ( ⁇ ').
- the liquid is preferably left at a temperature higher than the melting point by at least 10 seconds for at least 20 seconds. It is preferable to leave for 0 seconds to 3 minutes.
- the heat treatment time may be extended, but if the heat treatment time is prolonged, depending on the combination of the thermoplastic resin ( ⁇ ') and the liquid crystal polymer ( ⁇ '), Since the molten spherical liquid crystalline polymer ( ⁇ ′) may aggregate and change its microdispersed state, it is preferable to use a spherical particle diameter without extending the heat treatment time.
- thermoplastic resin composition in which the liquid crystalline polymer ( ⁇ ′) is dispersed in the form of islands in the matrix phase of the thermoplastic resin (A ′) in the form of islands is provided.
- both may be blended in the above composition ratio and kneaded.
- it is kneaded with an extruder, extruded into a pellet, and used for the next injection molding, but is not limited to kneading using such an extruder.
- a single-screw or twin-screw extruder used for kneading and extruding an ordinary thermoplastic resin is used.
- thermoplastic resin composition in a dispersed state, ( ⁇ liquid crystalline polymer)
- the melt viscosity ratio ( ⁇ ') between the thermoplastic resin ( ⁇ ') and the liquid crystalline polymer ( ⁇ ') measured at a processing temperature above the flow start temperature of ( ⁇ ') and a shear rate of 1200 sec- 1 ⁇ / '77) is set to 0.1 or more, preferably 0.1 or more to 6 or less, (2) a method of repeating kneading and extrusion, (3) a method in which the liquid crystalline polymer ( ⁇ ') to be compounded is prepared in advance.
- There is a method of pulverization, etc. which can be selected as appropriate or two types of methods can be used in combination.
- melt viscosity ratio in a specific range.
- the viscosity of the matrix (thermoplastic resin) phase is too low, the liquid crystal polymer ( ⁇ ') does not have sufficient shearing stress and extension stress, and the liquid crystal polymer force is less likely to be maintained. If it exceeds, the liquid crystalline polymer ( ⁇ ') becomes fibrous, but the viscosity of the thermoplastic resin ( ⁇ ') becomes high, so that the fibrous liquid crystalline polymer has a large diameter and the reinforcing effect is poor. It is not preferable because problems such as sluggishness and poor fluidity during molding may occur.
- the flow start temperature of the liquid crystalline polymer ( ⁇ ') is the temperature at which the liquid crystalline polymer ( ⁇ ') exhibits fluidity due to external force when heated and heated by the method described below. You.
- each injection-molded article provided by the present invention has a thermoplastic resin matrix.
- the liquid crystalline polymer is very well dispersed in the phase and is maintained at a high aspect ratio, so high rigidity and high strength can be maximized. Suitable for improving the physical properties of the body.
- each of the injection molded articles provided by the present invention contains a liquid crystalline polymer contained in the form of a fiber and has a reinforcing effect.
- a known filler, powder, granule, plate or hollow filler may be blended within a range that does not impair the effects of the present invention depending on the use.
- the present invention will be described specifically with reference to Examples, but the present invention is not limited thereto.
- the method for evaluating the injection molded body is as follows.
- melt flow value (gZl 0 min) at the processing temperature was measured.
- the flexural modulus (kg / cm 2 ) of a flexural test piece having a thickness of 1/16 inch was measured.
- a mobile phone-type molded body schematically shown in FIG. 1 was molded, a hatched portion was cut out, and measurement was similarly performed according to ASTM. The same applies to the following evaluation items.
- Example 12 the flexural modulus (kg / cm 2 ) of a bending test piece having a thickness of 1Z32 inches was measured in accordance with ASTM D790.
- the test piece used in the measurement of the curvature i: f modulus was cut so that a plane parallel to the flow direction emerged, the section was mirror-polished, and the surface was evaluated by observation with an electron microscope.
- the thickness and length of 50 randomly selected fibrous liquid crystalline polymers were measured.
- the length of the portion observable on the surface was defined as the length of the fiber.
- those having an average aspect ratio of 8 or more were represented by a triangle
- those having an average aspect ratio of 8 to 6 were represented by X
- those having an average aspect ratio of less than 6 were represented by X.
- the test piece was pulverized, and the melt viscosity under a shear stress of 1200 sec_ 'was measured at a molding temperature (cylinder set temperature) using a Toyo Seiki Capillograph.
- the viscosity ratio (A ;? B?) Or (A '77 / B' 7?) Is based on the raw material thermoplastic resin ( ⁇ ) or ( ⁇ ') and the liquid crystalline polymer ( ⁇ ) or
- the melt viscosity of ( ⁇ ') was determined by measuring (A ;?) or ( ⁇ ' ⁇ , ( ⁇ ?) Or ( ⁇ ';?), respectively.
- Example 1 Using a capillary rheometer (Flow Tester CFT-500, manufactured by Shimadzu Corporation), heat-melt the sample resin at a heating rate of 4 knots under a load of 100 kgZcm 2 with an inner diameter of lmm and length. When extruded from a 1 Omm nozzle, the melt viscosity was expressed as 48,000 voids. (Example 1)
- a polycarbonate resin Mitsubishi Gas Chemical Co., Ltd., Iupilon S3000
- liquid crystalline polyesters p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid (molar ratio 70:30)
- It is a liquid crystalline polyester with a temperature of 250, a melting point of 280 and an logarithmic viscosity of 5.7 (d 1 / g).
- the mixture was melt-kneaded at a resin temperature of 300 using a 30 mm twin-screw extruder, and pelletized.
- a test piece was molded from the pellet with an injection molding machine (side gate) at a molding temperature of 300 (indicating the cylinder-set temperature. The resin temperature is higher than this).
- Mechanical properties, melt viscosity, liquid crystallinity The average aspect ratio of the polyester was evaluated. Table 1 shows the results. Table 1 shows the viscosity ratio ( ⁇ ⁇ ⁇ ⁇ ⁇ ) of the raw material polycarbonate resin (A) and the liquid crystalline polyester (B) at 300 and 1200 sec. Table 2 is also shown).
- the dispersed particle size of the liquid crystalline polyester was 25 ( ⁇ m) in weight average, and 80% by weight or more of the dispersed particles had a particle size of 5 to 45 ( ⁇ m). m).
- the molding conditions are as follows.
- Example 1 A pellet made of a polycarbonate resin and a liquid crystalline polyester was obtained in the same manner as in Example 1. Molding conditions using the pellets were as follows ⁇ Example 1 Specimens were formed in the same manner as in Table 11 shows the results.
- Example 1 Using the same pellets as in Example 1, a test piece was molded at an injection molding machine (pin gate) at a molding temperature of 300, and the mechanical properties, melt viscosity, and average aspect ratio of the liquid crystalline polyester were evaluated. . Table 1 shows the results.
- the undispersed heat-treated pellets had a dispersed particle size of the liquid crystalline polyester of 25 (m) in weight average and a dispersed particle size of 80 or more than 96. Was in the range of 5 to 45 (/ m).
- the molding conditions are as follows.
- the mixture weight ratio of the polyphenylene sulfide resin (melting point: 285, melt viscosity measured at a temperature of 310 at a shear rate of 1,200 sec- 1 at a melt viscosity of about 1,400) and the liquid crystalline polyester used in Example 1 was 7: 3.
- the resin mixture was melt-kneaded at a resin temperature of 310 in a 30 mm twin-screw extruder and pelletized. Then, inject the pellet A test piece was molded at a molding temperature of 300 using a molding machine (side gate), and the mechanical properties, melt viscosity, and average aspect ratio of the liquid crystalline polyester were evaluated. The results are shown in Table 1.
- the dispersion particle size of the liquid crystalline polyester obtained by heat-treating the pellets before molding without load was 25 (/ m) in weight average, and the particle size of 80% by weight or more of the dispersion particles was 5%. ⁇ 45 (// m).
- the molding conditions are as follows.
- the liquid crystalline polyester used in Example 1 were mixed at a mixing weight ratio of 7: 3, and a 30 mm biaxial
- the mixture was melted and kneaded at an extruder at a resin temperature of 290, and pelletized.
- a test piece was molded from the pellet with an injection molding machine (side gate) at a molding temperature of 270, and the mechanical properties, melt viscosity, and average exhaust ratio of the liquid crystalline polyester were evaluated. Table 1 shows the results.
- the dispersion particle size of the liquid crystalline polyester obtained by heat-treating the pellets before molding without load was 24 (jum) on average, and the particle size of 80% by weight or more of the dispersion particles was 6 to 10%. It was in the range of 46 ( ⁇ m).
- the molding conditions are as follows.
- Example 2 Polycarbonate resin (Iupilon S 3000, manufactured by Mitsubishi Gas Chemical Co., Ltd.) and the liquid crystalline polyester used in Example 1 were mixed at a 7: 3 weight ratio using a 30 mm twin-screw extruder. The mixture was melt-kneaded at 300 and pelletized. Next, a test piece was molded from the pellet at an injection molding machine (pin gate) at a molding temperature of 300, and the mechanical properties, melt viscosity, and average exhaust ratio of the liquid crystalline polyester were evaluated. Table 1 shows the results.
- the liquid crystalline polyester used in Example 1 were blended in a mixing weight ratio of 7: 3, and a 30 mm It was melted at a resin temperature of 290 with a twin screw extruder and pelletized. Then, a test piece was formed from the pellet at an injection molding machine (side gate) at a molding temperature of 270, and the mechanical properties, melt viscosity, and average eject ratio of the liquid crystalline polyester were evaluated. Table 1 shows the results.
- the dispersion particle size of the liquid crystalline polyester obtained by heat-treating the pellets before molding without load was 40 ( ⁇ m) on average, and the diameter of 80% by weight or more of the dispersed particles was 10%. 7070 (m).
- the molding conditions are as follows.
- a blend of a polycarbonate resin (PC) and an ABS resin (Nono, 'Roy S 1500, PC: ABS 7: 3, manufactured by Daiceli Kagaku Co., Ltd.) and the liquid crystalline polyester used in Example 1
- PC polycarbonate resin
- a mixture of 100 parts by weight of a resin component having a mixing weight ratio of 7: 3 and 0.3 parts by weight of bis (2,6-di-tert-butyl-4-methylfuel) pentaerythritol diphosphite as a phosphite ester was mixed with 30 parts by weight. The mixture was melt-kneaded at a resin temperature of 270 with a twin screw extruder and pelletized.
- a test piece was formed from the pellet at an injection molding machine (side gate) at a forming temperature of 290, and the mechanical properties, melt viscosity, and average aspect ratio of the liquid crystalline polyester were evaluated.
- the results are shown in Table-2.
- the dispersed particle size of the liquid crystalline polyester melted under no load before molding was 26 (urn) in weight average, and 80% by weight or more of the dispersed particles had a particle size of 12 to 49 ⁇ ). Was in the range.
- the molding conditions are as follows.
- Example 2 Mixed weight of a blend of polycarbonate resin and ABS resin (Daicel Chemical Co., Ltd., Nono, 'Roy S1500) and the liquid crystalline polyester used in Example 1! : 0.2 parts by weight of bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite as a phosphite is blended with 100 parts by weight of a resin having a ratio of 8: 2, The mixture was melted and kneaded at a resin temperature of 270 using a screw extruder to form pellets. Next, a test piece was molded in the same manner as in Example 5, and the physical properties and the like were evaluated. The results are shown in Table 1-2.
- the liquid crystalline polyester dispersed in a pellet melted with no load before molding had a diameter of 27 (m) in weight average, and 80% by weight or more of the dispersed particles had a particle diameter of at least 80% by weight. Ranged from 13 to 49 ( ⁇ m). (Example 7)
- 0.1 part by weight of bis (2,6-di-tert-butyl-4-methylphenyl) as a phosphite was mixed with 0 part by weight of the mixture, and the mixture was fed into a 30 mm twin-screw extruder. The mixture was melted and kneaded at a resin temperature of 270 to form a pellet.
- a test piece was molded in the same manner as in Example 5, and the physical properties and the like were evaluated. The results are shown in Table 1-2.
- the dispersed particle size of the liquid crystalline polyester obtained by melting the pellet without load before molding was 25 (/ m) in weight average, and 80% by weight or more of the dispersed particles was the particle size. Ranged from 10 to 48 (m).
- a polycarbonate resin (Iupilon H300, manufactured by Mitsubishi Gas Chemical Co., Ltd.) melted at a resin temperature of 270 using a 3 O mm twin-screw extruder and a polybutylene terephthalate resin (polystyrene)
- Bis (2,6-di-4-methylphenyl) pentaerythritol diphosphite as phosphite is 0.2 parts by weight.
- the mixture was melted and pelletized with a resin ⁇ 290 using a 30 mm twin screw extruder.
- a test piece was molded in the same manner as in Example 5, and the physical properties and the like were evaluated. The results are shown in Table 1-2.
- the liquid crystalline polyester obtained by melting the pellets before molding without load The particle diameter of the dispersed particles was 32 (m) in weight average, and more than 96 of the dispersed particles by weight had a particle diameter in the range of 23 to 50 (/ m).
- a polycarbonate resin Mitsubishi Gas Chemical Co., Ltd., Iupilon H3000
- a polybutylene terephthalate resin Polyplastics (Plastics) Co., Ltd., DX-2000
- 0.2 parts by weight of bis (2,6-di-4-methylphenyl) pentaerythritol diphosphite was blended as an ester, and the mixture was melt-kneaded at a resin temperature of 290 with a 3 Omm twin-screw extruder to form a pellet.
- a test piece was molded in the same manner as in Example 5, and the physical properties and the like were evaluated. The results are shown in Table 1-2.
- the dispersed particle diameter of the liquid crystalline polyester of the pellet melted with no load before molding was 29 ( ⁇ m) in weight average, and was 80% by weight or more of the dispersed particles; It was in the range of 18-48 (// m).
- Melting point 280 of polycarbonate resin Mitsubishi Gas Chemical Co., Ltd., Iupilon S3000
- liquid crystalline polyester ⁇ p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid (molar ratio 70:30). It shows a liquid crystalline polyester having a flow start temperature of 250 and an intrinsic viscosity of 5.7 (d 1 / g).
- the mixture was melt-kneaded at a resin temperature of 300 with a 30 mm twin-screw extruder and pelletized.
- the pellet was molded at a molding temperature of 300 with an injection molding machine (gate size: 0.5 ⁇ 40 mm; runner cross-sectional area: 60 mm 2 ) at a molding temperature of 300, and the mechanical properties, The melt viscosity, the average aspect ratio of the liquid crystalline polyester and the weight average particle size were evaluated. Table 13 shows the results.
- Polycarbonate resin (Ubilon S300, manufactured by Mitsubishi Gas Chemical Co., Ltd.) and the liquid crystalline polyester used in Example 10 were mixed at a weight ratio of 8: 2.
- 0.3 parts by weight of bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite is blended as an acid ester, and the mixture is melt-kneaded at a resin temperature of 300 using a 30 mm twin-screw extruder. Pelletized.
- the pellet was molded at a molding temperature of 300 with an injection molding machine (gate size: 0.5 ⁇ 40 mm; runner cross-sectional area: 60 mm 2 ) at a molding temperature of 300, and the mechanical properties, melt viscosity, and liquid crystal
- the average aspect ratio and weight average particle size of the conductive polyester were evaluated. Table 13 shows the results.
- a polycarbonate resin (Mitsubishi Gas Chemical Co., Ltd., Iupilon S3000) and the liquid crystalline polyester used in Example 10 were blended so that the mixing weight ratio was 6: 4, and the mixture was mixed into a 30 mm twin screw extruder. It was melted and connected at a resin temperature of 300 to form a pellet. Next, the pellet was molded at a molding temperature of 300 with an injection molding machine (gate size: 0.5 x 40 mm; runner cross-sectional area: 60 mm 2 ) at a molding temperature of 300, and mechanical properties and melt viscosity were measured. The average aspect ratio and weight average particle size of the liquid crystalline polyester were evaluated. Table 13 shows the results.
- Example 10 Comparative Example 4 Injection iiS (mZ content) 6.0 6.0 6.0 6.0 6.0 Female pressure (kg / cm ⁇ ) 900 1200 1900 Cylinder temperature (te) 300 300 300 Flexural modulus ( kgZcm 2 ) 78.000 53.000 35.000 ⁇ ⁇ of liquid crystalline polyester
- Liquid crystalline Hüster's Sfi 18 35 particles cannot be dispersed in average dispersed particle size (/ m)
- a resin with a mixing weight ratio of 7: 3 is blended, and the resin temperature is adjusted to 190 with a 30 mm twin-screw extruder. The mixture was melted and kneaded in a pellet. Then, a test piece was molded from the pellet with an injection molding machine (side gate) at a molding temperature of 190, and the mechanical properties, melt viscosity, and average aspect ratio of the liquid crystalline polyester were evaluated. Table 14 shows the results.
- the liquid crystal polyester dispersed in the pellet before melting without load was 25 ( ⁇ m) in weight average, and 80% by weight or more of the dispersed particles had a diameter of 5 mm. It was in the range of ⁇ 45 ( ⁇ m).
- the molding conditions are as follows.
- the liquid crystal polyester dispersion diameter of the pellet melted without load before molding was 30 (um) in weight average, and the weight of the dispersed particles was 80% i% The above was in the range of particle size of 5 to 45 (fim).
- the molding conditions are as follows.
- the liquid crystalline polyester dispersed in a pellet melted with no load before molding had a weight-average dispersion diameter of 30 ( ⁇ m), and 80% by weight or more of the dispersed particles had a particle diameter of 5%. It was in the range of ⁇ 45 (jm).
- the molding conditions are as follows.
- the dispersed particle size of the liquid crystalline polyester of the pellet melted with no load before molding was 30 (/ zm) by weight average, and 80% or more of the dispersed particles had a particle size of 5% or more. ⁇ 45 (fim).
- the molding conditions are as follows.
- liquid crystalline polyester Polyplastics Co., Ltd., Vectra A950 powder
- a resin having a mixing weight ratio of 7: 3 was blended, melt-kneaded at a resin temperature of 190 with a 3 Omm twin screw extruder, and pelletized.
- a test piece was molded from the pellet with an injection molding machine (side gate) at a molding temperature of 90, and the mechanical properties, melt viscosity, and average aspect ratio of the liquid crystalline polyester were evaluated. Table 14 shows the results.
- the dispersion particle size of the liquid crystalline polyester of the pellet before molding was complicated and not uniform, and could not be evaluated.
- the molding conditions are as follows.
- liquid crystalline polyester dispersed in a pellet melted without load before molding had a diameter of 25 (im) on average, and 80% or more of the dispersed particles had a diameter of 5 to 45%. ( ⁇ m) range.
- the molding conditions are as follows.
- the dispersion diameter of the liquid crystalline polyester of the pellet melted with no load before molding was 30 (/ zm) on a weight average, and 80% by weight or more of the dispersion abducted. The diameter ranged from 5 to 45 ( ⁇ m).
- the molding conditions are as follows. 1Runner cross section SnZ gate cross section S G : 9.3
- the liquid crystalline polyester dispersion diameter of the pellet melted with no load before molding was 25 ( ⁇ m) in weight average, and 80 weights or more of the dispersion lactate had a particle size of more than 96. 445 (m).
- the molding conditions are as follows.
- the mixing weight ratio of the polyamide resin (UBE Nylon 6 (101B), melting point 2 ° C, manufactured by Ube Industries, Ltd.) and the liquid crystalline polyester (Rodrun LC3000, manufactured by Unitika Ltd.)
- the 7: 3 resin was blended, melt-kneaded at a resin temperature of 230 with a 3 Omm twin screw extruder, and pelletized.
- a test piece was molded from the pellet with an injection molding machine (side gate) at a molding temperature of 230, and the mechanical properties, melt viscosity, liquid
- Table 14 shows the results.
- the dispersed particle diameter of the liquid crystalline polyester of the pellet melted without load before molding was 30 Om in weight average, and the weight of dispersed particles was 80 weight: ft% or more. It was in the range of 45 ( ⁇ m).
- the molding conditions are as follows.
- thermoplastic resin composition according to the present invention by using the thermoplastic resin composition according to the present invention and performing injection molding under the molding conditions according to the present invention, a dispersed fibrous liquid crystal which cannot be obtained by the same kind of technology conventionally.
- a thermoplastic resin molded article containing a conductive polymer can be obtained. Since this molded article has characteristics of extremely high rigidity and high strength, it is preferably applied to a thin-walled molded article, particularly to a housing of an electronic device.
- FIG. 1 is an explanatory diagram of a cross-sectional area of a gate and a runner.
- FIG. 2 is an explanatory view of a mobile phone-type molded body molded in Examples 10 and 11 and Comparative Example 4.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/817,346 US6010760A (en) | 1994-10-18 | 1995-10-18 | Thermoplastic resin composition, injection molding method thereof, and injection molded article |
EP19950934830 EP0790280B1 (en) | 1994-10-18 | 1995-10-18 | Thermoplastic resin composition, injection molding method thereof and injection molded article |
DE1995632763 DE69532763T2 (de) | 1994-10-18 | 1995-10-18 | Thermoplastische harzzusammensetzung, spritzgiessverfahren und spritzgiesskörper |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27717894A JP3170552B2 (ja) | 1994-10-18 | 1994-10-18 | 射出成形品 |
JP6/277178 | 1994-10-18 | ||
JP27717794 | 1994-10-18 | ||
JP6/277177 | 1994-10-18 | ||
JP7/124359 | 1995-04-25 | ||
JP12435995A JP3355061B2 (ja) | 1994-10-18 | 1995-04-25 | 熱可塑性樹脂組成物、その射出成形方法および射出成形体 |
JP27060895A JP3415346B2 (ja) | 1995-09-25 | 1995-09-25 | 射出成形方法 |
JP7/270608 | 1995-09-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996011985A1 true WO1996011985A1 (fr) | 1996-04-25 |
Family
ID=27471027
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1995/002133 WO1996011985A1 (fr) | 1994-10-18 | 1995-10-18 | Composition de resines thermoplastiques, son procede de moulage par injection et article ainsi moule |
Country Status (6)
Country | Link |
---|---|
US (1) | US6010760A (ja) |
EP (1) | EP0790280B1 (ja) |
KR (1) | KR100366341B1 (ja) |
CN (2) | CN1185301C (ja) |
DE (1) | DE69532763T2 (ja) |
WO (1) | WO1996011985A1 (ja) |
Cited By (3)
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EP0653460A3 (en) * | 1993-11-11 | 1997-07-30 | Polyplastics Co | Synthetic resin composition and its molded product. |
EP0943409A1 (en) * | 1996-11-29 | 1999-09-22 | Polyplastics Co. Ltd. | Injection-molded object |
WO2005116141A1 (ja) * | 2004-05-26 | 2005-12-08 | Polyplastics Co., Ltd. | 熱可塑性樹脂組成物 |
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- 1995-10-18 KR KR1019970701105A patent/KR100366341B1/ko not_active IP Right Cessation
- 1995-10-18 US US08/817,346 patent/US6010760A/en not_active Expired - Lifetime
- 1995-10-18 CN CNB021433151A patent/CN1314754C/zh not_active Expired - Fee Related
- 1995-10-18 EP EP19950934830 patent/EP0790280B1/en not_active Expired - Lifetime
- 1995-10-18 DE DE1995632763 patent/DE69532763T2/de not_active Expired - Lifetime
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0653460A3 (en) * | 1993-11-11 | 1997-07-30 | Polyplastics Co | Synthetic resin composition and its molded product. |
EP0943409A1 (en) * | 1996-11-29 | 1999-09-22 | Polyplastics Co. Ltd. | Injection-molded object |
EP0943409A4 (en) * | 1996-11-29 | 2000-01-19 | Polyplastics Co | INJECTION MOLDING OBJECT |
WO2005116141A1 (ja) * | 2004-05-26 | 2005-12-08 | Polyplastics Co., Ltd. | 熱可塑性樹脂組成物 |
Also Published As
Publication number | Publication date |
---|---|
CN1185301C (zh) | 2005-01-19 |
EP0790280A4 (en) | 1998-08-12 |
EP0790280A1 (en) | 1997-08-20 |
CN1314754C (zh) | 2007-05-09 |
EP0790280B1 (en) | 2004-03-24 |
DE69532763T2 (de) | 2005-03-10 |
DE69532763D1 (de) | 2004-04-29 |
CN1491989A (zh) | 2004-04-28 |
KR970705612A (ko) | 1997-10-09 |
CN1161052A (zh) | 1997-10-01 |
US6010760A (en) | 2000-01-04 |
KR100366341B1 (ko) | 2003-05-16 |
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