TW200811233A - Styrene resin composition and molded body - Google Patents

Abstract

Disclosed is a resin composition which enables to obtain a molded body excellent in dimensional stability, light resistance, optical characteristics and thermal stability. Also disclosed is a molded body of such a resin composition. Specifically disclosed is a styrene resin composition containing, per 100 parts by mass of a styrene copolymer composed of 90-99% by mass of a styrene monomer unit and 10-1% by mass of a (meth)acrylic acid monomer unit, 1-10 parts by mass of an unmelted compound having a refractive index difference of 0.05-0.15 from the styrene copolymer and an average particle diameter of 2-10 μm or 0.5-2.5 parts by mass of polyorganosiloxane crosslinked beads having an average particle diameter of 1-10 μm, 0.1-2 parts by mass of a hindered amine compound, and 0.1-2 parts by mass of a benzotriazole compound.

Description

[Technical Field] The present invention relates to a styrene resin composition and a molded body formed using the same. [Prior Art] A screen lens for a transmissive screen or the like for projecting a television image represents a portrait on which a projection image is placed. This screen lens is formed by a combination of a lens shaped body such as a lenticular lens or a Fresnel lens, which is expected to be bright and has a wide viewing angle. Among these lens molded bodies, methacrylic resins which are excellent in transparency, light resistance, scratch resistance, and moldability are widely used, and these molded articles are generally formed by press molding, extrusion molding, casting molding, and the like. Molding is performed by injection molding or the like. The methacrylic resin used in this screen lens has a high water absorption rate, and thus the molded body formed therefrom is liable to undergo dimensional change via water absorption. In order to solve this problem, it has been disclosed that a mixture of an aromatic vinyl monomer, a (meth) acrylate monomer, and a polyfunctional unsaturated monomer is used to dissolve a styrene-diene copolymer. A method of obtaining a Fresnel lens after polymerizing a resin (Patent Document 1). Further, methacrylic resin is also used for the diffusing plate forming material of the liquid crystal TV, and this also has the same problem. SUMMARY OF THE INVENTION An object of the present invention is to provide a molded article of a resin composition which is qualitative, light-resistant, and optically 'thermally stable. In order to solve the above problems, the present inventors have refined a styrene-based tree containing a copolymer of a styrene monomer unit and a methyl propyl main component, a specific unmelted crosslinked ball, and a specific light stabilizer. After the extrusion molding, a molded article having good properties, light diffusibility, and thermal stability can be obtained. Further, the present invention has the following gist. 1. The vinyl-based copolymer of 90% by mass to 99% by mass of styrene: (% by mass) of the (meth)acrylic monomer unit is contained in the range of 0.05 to 0.15, 1 to 10 with the styrene. The average particle diameter of the mass fraction of the compound, or 0.5 to 2.5 parts by mass of the particle size 1 〃 oxyalkylene crosslinked sphere and 0.1 to 2 parts by mass of the benzotriazole compound of 1 to 2 parts by mass Things. 2. The unmelted compound is contained in the above-mentioned 1 contained (crosslinking copolymer of methyl monomer unit). 3. The unmelted compound is crosslinked by a monomer unit containing methyl propenyl-butyl ester. The resin composition having a good dimensionally stable molded body on the polymer was found to be densely tempered, and it was found that the olefinic acid monomer unit or the polyorganooxymethane lipid composition achieved the present invention by injection dimensional stability and light resistance. Monomer unit and 10~1 or 100 parts by mass of benzene copolymer having a refractive index difference of 2 to 10//m of unmelted 10//m polyorganic sand S amine compound, and styrene resin group) Acrylate-based monomer: a styrene-based resin composition of methyl enoate and a styrene-based-6-200811233 resin composition as described in the above. 4. The hindered amine compound is a styrene resin composition according to any one of the above 1 to 3 of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate. 5. The benzotriazole compound is 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3·tetramethylbutyl)phenol, any of the above 1 to 4 The styrene resin composition of the item. 6. The styrene-based resin composition according to any one of the above 1 to 5, wherein the styrene-based copolymer is further contained in an amount of 0.005 to 0.5 part by mass of the benzoxazole-based compound. 7. The benzoxazole-based compound is a styrene-based resin composition contained in the above 6 of 2,5-thiophenediyl (5-t-butyl-1,3-benzoxazole). (8) The styrene resin composition further contains 0.1 to 3 parts by mass of an amine-based surfactant, an anionic surfactant, and a non-amine nonionic system for 1 part by mass of the styrene copolymer. The styrene resin composition according to any one of the above 1 to 7 of the surfactant. • The amine surfactant is N-hydroxyethyl-N. (2-hydroxyalkyl)amine. The styrene resin composition contained in the above 8 is contained. . 1 〇·anionic surfactant and non-amine nonionic surfactant. 'The compounding ratio is anionic surfactant/non-amine nonionic surfactant=0.5/99 · 5~15/85 (quality The styrene resin composition contained in the above 8 is compared. 11. Anionic surfactant The organic sulfonic acid metal salt having a carbon number of 10 to 14 and the non-amine nonionic surfactant are the above-mentioned 8 or 10 styrene resin composition of the glycerin fatty acid ester. The molded article obtained by the styrene resin composition according to any one of the above 1 to 1 1 is a molded body having a thickness of 1 to 7 mm. 13. The molded body is a molded body carried out in the above 12 of the injection molded body. 14. The molded body is a molded body contained in the above 12 of the extruded body. 15. The light-diffusing sheet of the molded article according to any one of the above items 12 to 14. The molded article formed from the styrene resin composition of the present invention has good light diffusibility, dimensional stability, light resistance, thermal stability, and brightness. [Embodiment] [Best Mode for Carrying Out the Invention] Hereinafter, a detailed description of the present invention will be made. Examples of the styrene monomer used in the present invention are styrene, ?-methylstyrene, p-methylstyrene, pt-butylstyrene, etc., preferably styrene. . Examples of the (meth)acrylic monomer used in the present invention are as follows: #acrylic acid, methacrylic acid, ethacrylic acid, and the like, preferably methacrylic acid. The styrene-based copolymer is composed of 90 to 99% by mass of a styrene monomer unit, preferably 91 to 97% by mass and 10 to 1% by mass of a (meth)acrylic monomer unit, more preferably 9 ~3% by mass. When the unit of the styrene monomer exceeds 99% by mass, the thermal stability of the obtained molded body is lowered, and if it is less than 90% by mass, the molded body is deformed by moisture absorption. The styrene-based copolymer may contain, in addition to the above-mentioned styrene-based monomer and (meth)propionic acid-based monomer, a vinyl monomer copolymerizable therewith, and -8 - 200811233 in a styrene-based single When the total amount of the body and the methacrylate monomer is 100 parts by mass, the amount is preferably 10 parts by mass or less. Examples of the vinyl monomer copolymerizable for this purpose include cyanide vinyl monomers such as acrylonitrile and methacrylonitrile; acrylic acid, maleic anhydride, maleic acid, itaconic acid, itaconic anhydride, etc. Saturated carboxylic acid monomer; maleic anhydride imide, N-methyl maleic anhydride imide, N-phenyl maleic anhydride, and the like. These can be used alone or in combination of two or more. In the styrene-based resin composition of the present invention, the following unmelted compound is contained in an amount of 1 to 10 parts by mass, preferably 2 to 9 parts by mass, per 100 parts by mass of the styrene-based copolymer. When the content of the unmelted compound is less than 1 part by mass, the haze and the diffusivity are small, and the light diffusibility is lowered. On the other hand, when it exceeds 10 parts by mass, the total light transmittance is lowered. The unmelted compound is not particularly limited, and generally contains a crosslinked copolymer of a (meth) acrylate monomer as a monomer unit, and specifically, for example, contains methyl methacrylate or ethyl methacrylate. Examples of the crosslinked copolymer of a monomer such as methyl acrylate or η-butyl acrylate, and a crosslinked copolymer containing methyl methacrylate and η-butyl acrylate. The unmelted compound is preferably a compound having a melting point or a softening point in an atmosphere of 1 atm, at a temperature of 200 ° C or higher. When the melting point and the softening point are less than 200 °C, the compound is easily melted during melt-kneading with a styrene-based polymer or during extrusion molding or injection molding of a styrene-based resin composition, and cannot be maintained well. Optical properties. The difference in refractive index between the unmelted compound and the styrene-butadiene copolymer is 0 · 0 5 〜 0 · 1 5 , preferably 〇 · 〇 7 〜 0 · 1 3 , and the average particle diameter is 2 to 10 / / m, Preferably it is 3 to 9 in m. When the refractive index is less than 0.05 -9 - 200811233, the haze and diffusivity of the obtained molded body become small, and the light diffusibility is lowered. On the other hand, when it exceeds 0 · 15 , the total light transmittance is lowered. Further, when the average particle diameter is less than 2 // m, the total light transmittance of the obtained molded body is lowered, whereas when it exceeds 10/zm, the haze and the light diffusivity are lowered. Further, the styrene-based resin composition of the present invention is a polyorganosiloxane cross-linked ball containing 0.5 to 2.5 parts by mass, preferably 0.8 to 2.2 parts by mass, per 100 parts by mass of the styrene-based copolymer. . When the content of the polyorganosiloxane cross-linked ball is less than 0.5 parts by mass, the haze and the diffusivity become small, and the light diffusibility is lowered, and if the amount exceeds 2.5 parts by mass, the total light transmittance is lowered, and the unmelted compound and The average particle diameter of the polyorganosiloxane cross-linked spheres was measured by a Coulter composite classifier (manufactured by Beckman Coulter Co., Ltd.). The measurement method is carried out by laser refracting light diffusion method. Water is used in the solvent, a homogenizer is used for 1 minute, and an output power of 200 W is added to disperse the sample, and the concentration of PIDS (polarization intensity differential dispersion) is adjusted to 45~ 55%, the refractive index of water was made 1.33, and the measurement was performed, and the average particle diameter was calculated from the volume distribution. The ethyl styrene resin composition of the present invention must contain 0. 1 to 2 parts by mass of the hindered amine compound, preferably 2 to 1.2 parts by mass, per 100 parts by mass of the styrene-based copolymer. And 1-2 parts by mass of the benzotriazole-based compound, preferably 0.2 to 1.2 parts by mass. When the hindered amine compound or the benzotriazole compound is less than ϊ by mass, the light resistance is insufficient, and if it exceeds 2 parts by mass, the yellowness of the obtained light-diffusing sheet is not preferable. -10- 200811233 Hindered amine compounds are amine-based light stability enhancers, such as: bis(2,256,6-tetramethylq(octyloxy)-4-piperazinyl) sebacate, double (1 ,2,2,6,6-pentamethyl-4-piperidinyl)[[3,5-bis(1,1 dimethylethyl)-4-phenyl)methyl]butylpropane Acid ester, bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate, methylpentamethylpiperidinyl sebacate, bis(2,2,6 For example, 6-tetramethyl-4-piperidinyl) sebacate, these may be used alone or in combination of two or more. Φ Further, the benzotriazole compound is a UV absorber such as 2-( 2H·benzotriazol-2-yl)-P-cresol or 2-( 2H-benzotriazol-2-yl). ·4·6-bis(1-methyl-1-phenylethyl)phenol, 2-[5-chloro(2Η)-benzoxazol-2-yl]-4-methyl]-6-( T-butyl)phenol, 2,4-di-t-butyl-6-(5-chlorobenzotriazol-2-yl)phenol, 2-(2H-benzotriazol-2-yl)- 4,6_--pentyl vinegar, 2-( 2H -benzotriazin-2-yl)-4-( 1,1,3,3 -tetramethylbutyl)phenol, etc., these may be separate Two or more types can also be used. Further, in the resin composition of the present invention, the fluorinated brightener benzoxazole compound further containing 0.0005 to 0.5 part by mass of the coloring agent for 100 parts by mass of the phenethyl olefin copolymer is more preferable. The amount is 0.0008 to 0.2 mass parts. When the content of the benzoxazole-based compound is 0.0005 parts by mass or more, the yellowness of the obtained sheet is lowered as compared with less than 0.0005 parts by mass, which not only improves the appearance but also enhances the total light transmittance of the obtained sheet. Further, when it is 0.5 parts by mass or less, the light resistance of the obtained multilayer sheet is further improved, and more preferably it is more than 0.5 parts by mass. Examples of benzoxazole compounds are: 2,5-thiophenediyl (5-t-butyl-1,3-benzoxazole), 2,5-thiophenediyl (5-t-butyl- 1,3-benzo-11 - 200811233 oxazole) 10% mixture with dicyclohexyl phthalate 90%, 4,4'-bis(benzoxazol-2-yl)anthracene, etc. These can be used alone or in combination. In the sheet of the present invention, when the antistatic property is imparted for dustproof, further 100 parts by mass of the styrene-based copolymer contains 0.1 to 3 parts by mass of an amine-based surfactant, an anionic surfactant, and a non-amine. The ion-based surfactant is more preferably contained in an amount of 0.1 to 2.5 parts by mass. When the amine-based B surfactant, the anionic surfactant, and the non-amine nonionic surfactant are 0.1 parts by mass or more, a sufficient antistatic effect can be obtained as compared with less than 0.1 part by mass. On the other hand, when the amount exceeds 3 parts by mass, the resulting sheet is more likely to cause discoloration. As an amine surfactant, such as: alkyl diethanolamine, polyethylene oxide alkylamine, alkyl diethanol amine, polyethylene oxide alkylamine, N-hydroxyethyl-N- ( 2 Examples of the -hydroxyalkylamines and the like may be used alone or in combination of two or more. # As an anionic surfactant, for example, an organic sulfonic acid metal salt, specifically, for example, sodium alkylsulfonate, lithium alkylsulfonate, sodium alkylbenzenesulfonate, lithium alkylsulfonate, and the like. Among them, sodium alkyl sulfonate is preferred as the user. More _ ideally sodium alkylsulfonate having a carbon number of 10 to 14. These may be used alone or in combination of two or more. Examples of non-amine nonionic surfactants include polyethylene oxide alkyl ethers, polyethylene oxide fatty acid esters, and glycerin fatty acid esters. Among them, glycerol fatty acid ester is preferred. These may be used alone or in combination of two or more. -12- 200811233 When the anionic surfactant and the non-amine nonionic surfactant are used, the anionic surfactant/non-amine nonionic surfactant is 0.5/99.5 to 15/85 (mass ratio). Preferably, the ratio of 5/95 to 12/88 (quantity ratio) is used to obtain good antistatic properties. The method for producing the styrene-based copolymer of the present invention is not particularly limited, and a bulk polymerization method, a suspension polymerization method, a solution polymerization method, or an emulsification polymerization method can be generally used. • The method of blending the unmelted compound or the polyorganosiloxane cross-linking ball is not particularly limited, and is generally a method in which a styrene-based copolymer is blended before, during, and after polymerization, and is mixed with a styrene copolymer. After the method of cooperation, etc. When the styrene-based copolymer is granulated and then melt-mixed with an unmelted compound or a polyorganosiloxane cross-linked ball, the mixing method is not particularly limited, and generally, for example, a high-speed agitating mixer or a drum After the mixer and the known mixing device are subjected to preliminary mixing, they are melt-kneaded by using an extruder such as a uniaxial extruder or a twin-screw extruder, and then uniformly mixed. Further, in the styrene-based copolymer, the unmelted compound or the polyorgano-oxyalkylene crosslinked ball is placed in a high concentration mixture of a high concentration, and the high concentration mixture is prepared during injection/extrusion. After dry mixing with the styrene-based copolymer, the content of the unmelted compound or the polyorganosiloxane cross-linked ball can be used as a raw material after the content of the cross-linked ball is made to a predetermined concentration. The styrene resin composition of the present invention may be blended with an additive as necessary. For example, in order to improve fluidity and mold release, it can be blended with plasticizers, lubricants, and polyoxygenated oils. In addition, in order to further improve the thermal stability, it can be combined with heat stability -13- 200811233. The thickness of the molded article of the present invention is 1 to 7 mm, preferably less than 1 mm or more than 7 mm. [Examples] Hereinafter, the specific description of the present invention by way of examples is not limited to In these embodiments. [Production of Styrene-Based Copolymer] The tank used for the production is such that the first complete mixing tank of the first 15 L having a volume of about 5 L is connected until the first devolatilization tank and the second devolatilization tank are provided. The mass ratio of 85 mass% of the constituents in the in-line connection is 0.1 ppm by mass of the monomer solution of styrene and 15 mass% of methacrylic acid obtained in the reference example, and 15 parts by mass of ethylbenzene 0.01 mass of peroxyisopropylmonocarbonate and 0.2 part by mass of 2,4-dimethylene-1-pentene were mixed to prepare a raw material solution. This raw material was dissolved in 6.0 kg of a conversion rate of 28% by mass supplied to the outlet of the first complete mixing 1 complete mixing tank controlled at 135 °C. The mixing tank was then continuously taken out and supplied to a tank controlled at 135 °C. The conversion rate at the outlet of the second complete mixing tank was 63 f. The second complete mixing tank was continuously taken out, and after heating in the preheater, it was placed in the first devolatilization tank of 67 kPa and 160 °C. Further, the light diffusibility of the first 1 .3 to 4 m m , is only the full mixing tank of the present invention and the preheater. For 1 〇〇 4 -1 - butyl group 100 parts by mass of t-butyl E-based 4-methyl-liquid in an hourly tank. The first is completely mixed with the first one. Then, it was taken out by the introduction control in the devolatilization tank continuously -14-200811233, heated in a preheater, and introduced into a second devolatilization tank controlled at UkPa at 230 ° C to remove the monomer. The styrene-based copolymer (A-1) having a pellet shape after being subjected to a strand-like extrusion and cutting was used, except that a monomer solution composed of 92% by mass of styrene and 8% by mass of methylpropionic acid was used. Further, in the same manner as in (A-1), a styrene-based copolymer (A - 2 ) was obtained. A styrene-based copolymer (A-3) was obtained in the same manner as in (A-1), except that a monomer solution composed of 96% by mass of styrene and 4% by mass of methacrylic acid was used. A styrene-based copolymer (A-4) was obtained in the same manner as in (A-1) except that a monomer solution composed of 99.5 mass% of styrene and 〇·5 mass% methacrylic acid was used. [Polyorganosiloxane cross-linking ball (B) of unmelted compound] As a polyorganosiloxane cross-linking ball system of unmelted compound, GE Toshiba Polyoxo Co., Ltd. tospearl 120 (average particle) Diameter 2 "tn, refractive index 1.420) (Bl), tospearl 2000B (average particle size 6 M m, refractive index 1.420) (B-2), tospearl 3 120 (average particle size 12 from m, refractive index 1.420) B-3). [Production of MMA-iiBA Copolymer Crosslinked Ball (C) of Unmelted Compound] 20 parts by mass of methyl methacrylate, 80 parts by mass of η-butyl acrylate, and 5 masses were placed in an autoclave to which a stirrer was applied. Partial crosslinker -15- 200811233 Divinylbenzene, 0.2 parts by mass of a polymerization initiator of benzamidine peroxide, 0.001 parts by mass of a suspension stabilizer of sodium laurylbenzenesulfonate, and 5 parts by mass of a third phosphoric acid Calcium, 200 parts by mass of pure water, polymerization was carried out at a temperature of 9 5 ° C for 6 hours, and at a temperature of 13 (TC, polymerization for 2 hours. After the reaction was completed, washing, dehydration, and drying were carried out to obtain a crosslinked ball (C). The crosslinked sphere (C) has an average particle diameter of 4/m and a refractive index of 1.460. [Manufacture of styrene-MMA crosslinked sphere (D) of unmelted compound) is placed in an autoclave imparted to a stirrer 60 parts by mass of styrene, 40 parts by mass of methyl methacrylate, 5 parts by mass of a crosslinking agent of divinylbenzene, 0.2 parts by mass of a polymerization initiator of benzammonium peroxide, o.ooi by mass of a suspension stabilizer Sodium laurylbenzenesulfonate, and 0.5 parts by mass of calcium triphosphate, 200 parts by mass of pure water Polymerization for 6 hours at a temperature of 95 ° C, more at a polymerization temperature of 130 ° C 2 hours. After completion of the reaction, washing, dehydration, and drying were carried out to obtain a crosslinked ball (D). The average particle size of the crosslinked ball is 8 # m, and the refractive index is 1 · 5 5 5 . [Production of PMMA Crosslinked Ball (E) of Unmelted Compound] 100 parts by mass of methyl methacrylate, 5 parts by mass of a crosslinking agent of divinylbenzene, 〇. 2 mass in an autoclave to which a stirrer is applied a polymerization initiator of benzamidine peroxide, 0.001 parts by mass of a suspension stabilizer of sodium laurylbenzenesulfonate, and 5 parts by mass of calcium phosphate, 200 parts by mass of pure water at a temperature of 95 ° C The polymerization was carried out for 6 hours, and the polymerization was carried out at a temperature of 130 ° C for 16 hours. After completion of the reaction, washing, dehydration, drying, and ball extraction (E-1) were carried out. The average particle size of the crosslinked ball is 8 // m, and the refractive index is 1.5 mass parts of the third calcium phosphate, and the average particle diameter of the E-1 is 1 # m and the refractive index is 1.494. Crosslink 2). Further, in addition to the use of 1 part by mass of the third calcium phosphate, an average particle diameter of 3 # m and a refractive index of 1.4 94 balls (E - 3 ) were obtained in addition to the method. Further, in addition to 0.2 parts by mass of the third calcium phosphate, after the E-1 was produced, (E - 4 ) 〇 [colorant (F )] having an average particle diameter of 13/zm and a refractive index of 1.494 was obtained as a coloring. The agent used is a fluorescent whitening agent 2,5-thiophene dibutyl-1,3-benzohethane (), (chiba special tychemicals UbtexOB) (Fl), a resin colorant lanthanide derivative (learning system) Dialezin BLUE J) (F-2). [Interfacial Agent (G)] As an amine-based surfactant, if N-hydroxyethyl-N-(yl)amine (Dasper 125B manufactured by Sanhao Oil Co., Ltd.) is used as (G-1) anionic surfactant Sodium lauryl sulfonate (G-2), amine nonionic surfactant used glyceryl stearate diester < cross-linked 1.494 with the same ball (E-E-1 cross-linking with the law cross-linking Ball ^ ( 5-t- company Mitsubishi 2-hydroxyalkane. As a non-G-3) -17- 200811233 According to Table 1-2~1-3, the mixing ratio will be (A-1)~ a styrenic copolymer of (A-4), an unmelted compound of crosslinked spheres B-2, C, D, (E-1) to (E-4), bis(2,2,6,6-tetra A hindered amine compound of methyl-4-piperidinyl) sebacate, a benzotriazole system of 2-( 2H-benzotriazol-2-yl)-4,6-di-t-pentanol The compound, the coloring agent of (Fl) and (F-2), and the amine-based surfactant of N-hydroxyethyl-N-(2-hydroxyalkyl)amine (G-1) are mixed, and the diameter is 40 mm. The uniaxial extruder, the temperature of 240 ° C, and the number of spiral rotations of 100 rpm were mixed, and after granulation, the styrene resin of Table 1-2 to 1-3 was obtained. Particles of the composition 1-1 to 1-23. [Example 1 -1 to 1 -1 〇, Comparative Example 1 -1 to 1 · 1 5] The styrene resin composition 1_1 to 1-23 was used, and 2磅·Online spiral injection molding machine (manufactured by Niigata Iron Works Co., Ltd.), injection molding at a cylinder temperature of 23 °C, and obtaining a molded body having a size of 300 mm x 300 mm x 0.5 mm thick, 300 mm x 300 mm x 2 mm thick, and 300 x 300 x 10 mm thick. The optical properties, light resistance, dimensional stability (water absorption warp), antistatic property (surface specific resistance 値), and thermal stability of the body are evaluated in Tables 1-4 to 1-6. -1) ~(A-4) of the B-storage copolymer 'parent ball (B-1)~(B-3), C, D unmelted compound, double (2,2,6,6- Tetramethyl-4-piperidinyl) sebacate, benzotriazole compound of 2-(211-benzotriazol-2-yl)-4,6-di+pentanol, (?-1 ), (?-2) coloring agent, (〇-1)——(〇-3) surfactants are mixed according to Table 2-2~2-3, -18-200811233, with 40mm diameter The uniaxial extruder is kneaded at a temperature of 240 ° C and a spiral rotation of 100 rpm. The pellets of the styrene resin compositions 2-1 to 2-3 shown in Table 2-2 were obtained. [Examples 2-1 to 2-10, Comparative Examples 2-1 to 2-15] Using a styrene system Resin compositions 2-1 to 2-23 were obtained by an in-line spiral injection molding machine (manufactured by Niigata Iron Works Co., Ltd.), and were subjected to injection molding at a cylinder temperature of 230 ° C to obtain a size of 30 〇 mm x 300 mm x 0.5 mm thick and 300 mm x. 300mm x 2mm thick, 300x300x10mm thick molded body. The optical properties, light resistance, dimensional stability (water absorption warpage), antistatic property (surface specific resistance 値), and thermal stability of the molded article were evaluated and shown in Tables 2-3 to 2-5. It can be judged that the haze is 99% or more, the total light transmittance is 65% or more, the diffusion rate is 17% or more, b値 is 1.0 or less, and the brightness is 3 500 cm/m2 or more. Moreover, in order to exhibit good light resistance, the color difference Δ E must be less than 1, in order to have good dimensional stability, the water absorption warpage must be 1 mm or less, and the heating deformation must be insufficient for good thermal stability. 1 mm, in order to exhibit good antistatic properties, the surface specific resistance 値 must be 1 〇 12 Ω or less [Examples 1-11, 2-11] Using styrene resin composition 1-1, 2-1, Τ A die-type extruder produces a sheet. In addition, the squeezing device is a single-axis extruder with a full blade of 65 mm φ. The temperature of each of the flaking cylinders was operated at 230 ° C. -19- 200811233 , formed. The optical characteristics, light resistance, water absorption warpage, thermal stability, and surface specific resistance of the obtained extruded sheet are shown in Tables 1-4 and Table 2-3. [Table 1-1] Resin composition valence %) Styrene/methacrylic acid refractive index styrene copolymer A-1 85.3/14.7 1.570 Styrene copolymer A-2 92.1/7.9 1.581 Styrene copolymer A -3 960/4.0 1.588 Styrene copolymer A-4 99.6/0.4 1.595 -20- 200811233

[(N·一术] with surfactant surfactant 1 1 II 1 V 1 1 vine 1 1 1 1 1 colorant part 1 1 1 I 1 1 1 1 1 1 1 V 0.001 τ^Η Type 1 1 II 1 I » 1 1 I face 1 rH {Xi unmelted compound mass part 〇 (ri ο rn ο rn oo oo 13.0 o cn o cn ο cn o cn ο cn cn cn o cn o cn view -_1) 1—Η ώ ώ rH: ώ rH ώ TH ώ rH ώ (N ώ cn W E-4 (N w UQ tH ώ benzotriazole compound mass parts _1 ο ο ο cn cn CO rn cn CO rn rn m O m O CO ΓΛ mo Hindered amine compound mass parts. _1 m ο 0.05 Ο rn rn rn cn rn cn cn mo cn cn cn cn styrene; copolymer A4 parts by mass II 1 1 I 1 1 1 1 1 1 1 1 1 benzene Ethylene copolymer A-3 parts by mass 1 1 1 1 1 should be I 1 i employed 1 1 1 i styrene copolymer A-2 parts by mass _i ο ο τ-Η ο rH o 1—HOO 〇rH 〇tH O rH oo 赘< o rH o HO 1—H Styrene copolymer A-1 parts by mass 1 1 1 1 1 1 II 1 1 1 1 I 1 Resin 1-1 Resin 1-2 1-3 Purpose 14 Resin 1·5 Test 1-6 shed 1-7 Resin 1-8 Leaking 1-9 Resin l-io Leaking 1-11 View 142 recite purpose aimed purpose 1-13 1-14 -21--200811233

[ε-s] with surfactant surfactant I 1 TH ON o (N tn o inch · (N o 00 1 i 1 1 type K 1 < N ό ό (N ό cn ό (N c? mo (N ό rn ό 1 1 1 Colorant part by mass 1 joo 1 1 1 i-lpo V 1 1 Type rH (N di 1 1 1 1 1 1 1 1 part by mass ο rn o cn o rn o cn O rn 〇rn ο m O cn o cn Type tH ώ ώ ώ TH ώ TH ώ r—^ ώ rH ώ f ώ rH W benzotriazole compound 1 parts by mass 1 1 rn rn rn md rn cn mmo Hindered amine compound ί m c5 (T) om O rn cn cn o CO rn cn styrene copolymer Α 4 parts by mass V 1 1 I 1 1 1 1 o fH styrene copolymer Α-3 parts by mass 1 1 1 1 1 1 1 o 1 styrene copolymer Α-2 parts by mass o rH o ir-H O 1—H oo 't-η o ψ^4 Who 1 1 styrene copolymer Α-1 parts by mass 1 1 1 1 1 1 o 1 Cao κι 诵 1 1-15 栏 1-16 棚 1-17 诵 1-18 Resin 1-19 Resin 1-20 Resin 1-21 shed purpose 1.22 Resin 1-23 -22- 200811233 〔 Example 1-11 Resin 1-1 (Ν 72.3 99· 1 20.9 〇 inch d ν〇ο inch d lx 1016 Example 1-10 Resin 1-22 (Ν Η 99.1 21.2 inch 〇O tn oo ο lx 1016 Example 1-9 Resin 1-20 (Ν 73.0 99.1 20.3 ΓΠ 00 ν〇ο inch ο 1χ ΙΟ10 Example 1-8 Observation 1-18 ( Ν 70.6 99.2 23.0 卜〇卜ο νο ο inch ο 1χ ΙΟ10 Example 1-7 Resin 1-17 (Ν 71.5 99.2 21.9 〇vo ο νο ο inch ο lx 1011 Example 1-6 Resin 144 (Ν 75.1 99.0 18.0 rH VO ο νο ο inch ο lx 1015 Example 1-5 Resin 1-13 CN 73.9 99.1 19.3 (N 〇Ό ο ο ο lx 1016 Example 14 Resin 1-11 (Ν 66.1 99.4 27.5 VO ο ο ο ο ο lx 1016 Example 1-3 Resin 1-8 (Ν 67.1 99.3 26.4 CO inch ο ο ο lx 1015 Example U2 Resin 1-5 (Ν 66.4 99.4 27.2 (Ν Ο ο ο νο ο inch d> lx 1016 Example Μ 1-1 (Ν 72.8 99.1 20.5 inch ο inch ο ν〇ο inch ο lx 1016 Resin molded body thickness (mm) Total light transmittance (%) Haze (%) Diffusion rate (%) Xi light resistance Color difference ΔΕ ε ε S m 骅Heating deformation (mm) Antistatic surface inherent resistance (Ω) Optical characteristics

-23- 200811233

[ss] Comparative Example 1-11 Resin 1-19 68.5 99.3 25.2 τ-Η (Ν Ό Ο inch ο lx 109 Comparative Example MO Resin 1-16 (Ν 70.2 99.2 23.3 Ο 〇cn Ο inch ο 1 lx 1016 Comparative Example 1 -9 Resin 1-15 (Ν 76.8 98.9 16.8 〇〇τ—Η νο ο 寸 d lx 1016 Comparative Example 1-8 Resin M2 (Ν 81·2 97.9 12.5 inch inch Ο 寸 inch d ! lx 1015 Comparative Example 1 7 Resin 1-10 (Ν 60.8 99.5 30.9 inch inch ο Ό c5 inch ο lx 1016 Comparative Example 1-6 Resin 1-9 (Ν 77.3 98.8 16.3 cn ο ο νο ο inch ο lx 1016 Comparative Example 1-5 Resin 1-7 (Ν 63.5 99.4 29.1 〇 inch ο Ο 寸 inch ο lx 1016 Comparative Example 1-4 Resin 1-6 (Ν 58.3 99.6 32.6 CN Ο ^τ ο νο ο inch ο lx 1016 Comparative Example 1^3 Resin 1- 4 (Ν 84.6 96.6 inches Os Ο inch ο Ό Ο inch ο lx 1015 Comparative Example 1-2 Resin 1-3 (Ν 71.9 99.1 21.4 rH νο inch ο lx 1016 Comparative example 翻 1-2 (Ν 73.4 99.1 20.0 ( Ν Ο Ό Ο inch ο lx 1016 Use resin! Μ 13⁄4 m Ι$ΣΠ Total light transmittance (%) Haze (%) Diffusion rate (%) Crane light resistance ΔΕ ί S Μ η im Anti-static Intrinsic surface resistance (Ω) Optical characteristics-24- 200811233 Comparative Example 1-12 Comparative Example 1-13 Comparative Example 1-14 Comparative Example 1-15 Resin shed 1-21 Resin 1-23 Test 1-1 Resin 1-1 Thickness of the molded body (mm) 2 2 0.5 10 Optical characteristics Total light transmittance (%) 73.6 71.7 86.3 51.2 Haze (%) 99.1 99.1 95.0 99.8 Diffusion rate (%) 19.6 21.6 7.2 34.9 Straight 0.4 0.4 0.4 0.5 Light fastness ΔΕ 0.3 0.8 0.5 0.3 Dimensional stability Water absorption warp (mm) 1.3 0.2 0.5 0.1 Heat deformation (mm) 0.1 1.2 0.5 0.1 Antistatic surface specific resistance (Ω) lx 1016 lxlO16 lxlO16 lxlO16 -25- 200811233

U-8] with surfactant surfactant 1 1 1 1 1 1 1 1 1 II 1 I 1 (Ν ΙΟ (Ν Ο οο τ Η ο (Ν rsi ο 〇〇 1 1 I Type 1 I 1 1 1 I 1 1 1 1 1 II 1 Η Ο Ο cn Ο rn Ο ό Lg^ 丨G-3 I 1 1 1 Colorant parts 1 1 1 1 1 1 1 1 1 1 0.005 1 0.05 1 I 0.005 1 1 1 I 1 0.005 0.005 1 9 1 Species I 1 1 1 1 I 1 1 1 1 1 Η ώ rH I 1 1 I Η ώ rH 1 1 1 Unmelted compound parts by mass P p rH p 1—H csj oo (N o inch· ο Η ρ τ—1 Ο 1—Η ο rH ο ο ο Τ-Η ο ο ο τ—Η ο ^Η ο ρ O po 〇1—1 Type i Β-2 1 B-2 I B-2 τ-Η ώ ώ U rH ώ Β-2 L^2J Lb-2-Lb - 2" Β-2 1 Β-2 I 1 <Ν ώ B-2 (N m B-2 B-2 benzotriazole compound 1 mass parts cn ο 0.05 o cn o cn o rn 〇ΓΛ cn cn ο rn ο rn c> ΓΛ Ο ΓΛ cn cn ο ΓΛ cn Ο m Ο Ο ο cn rn 〇mom 〇m 〇 hindered amine compound mass parts md 0.05 O rn O md cn O m ο m ο m ο m ο cn ο m ο m ο rn Ο m Ο Ο m ο cn ο rn O mo cn o cn O styrene copolymer A-4 parts by mass 1 1 1 1 1 1 1 1 1 II 瞧I 1 1 ! I 1 I 1 1 1 o Styrene copolymer A-3 parts by mass 1 1 1 1 1 1 1 1 1 I 1 1 1 1 1 1 1 1 1 扉1 O ancestor Styrene copolymer A-2 parts by mass oo O ooooooooo ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο Parts by mass I _1 II 1 t 1 瞧1 1 1 1 1 1 1 1 1 1 1 1 喔1 o 1 V Styrene resin composition name 2-1 Resin 2_2 2-3 | Resin 24 I Resin 2-5 | Resin 2-6 1 Resin 2-7 Leaky 2-8 2-9 Resin 2-10 Resin 2-11 Resin 2-12 Resin 2-13 観2-14 Resin 245 Resin 2-16 Resin 2-17 *2-18 Reversible 249 Resin 2-20 Resin 2-21 Resin 2-22 | Deletion 2-23 1 -26- 200811233

[i] Example 2-11 Resin 2-1 (N 76.7 99.1 19.2 CN 〇 3680 o οο (Ν ο lx 1016 Example 2-10 Resin 2-22 Γνϊ 73.8 99.2 1 (N (N 〇3670 00 d inch) ο inchο lx 1016 Example 2-9 Resin 2-20 (N 75.6 99.1 19.8 (N 〇1 3590 00 o bο <Ν Ο |1χ10η Example 2-8 Resin 2-19 (N 75.8 99.1 19·7 3600 00 o Bu ο (Ν Ο lx ΙΟ 11 Example 2-7 Resin 2-17 (N 74.9 99.1 20.1 3560 卜o 卜 ο (Μ Ο lx 1011 Example 2-6 Resin 2-15 CN 1—^ 99.1 20.0 inch Ο 3570 卜o 卜ο (Ν Ο lx 1011 Example 2-5 Resin 2-12 (N 77.9 99.0 18.3 m ο 3710 〇o οο (Μ Ο lx 1016 Example 2-4 Resin 2-11 (N 77.0 99.0 18.9 Ο 3720 VO o ο (Ν Ο lx 1016 Example 2-3 Resin 2-7 (N 68.1 99.3 24.4 T-H 3650 卜 CN CN lx 1016 Example 2-2 Resin 2-5 Γ 4 67.7 99.3 24.1 Ο Ο 3630 V〇o 卜ο (Ν Ο lx 1016 Example 2-1 2-1 (N 76.4 99.1 19.3 (Ν Ο 3680 mo ο (Ν Ο lx 1016 Resin molded body thickness (mm) total light transmittance ( °/〇) Haze (%) Diffusion rate (%) ) Brightness (cd/m2) Light resistance color difference ΛΕ 1 s m (Η Heat deformation (mm) Antistatic surface specific resistance (Ω) Optical characteristics -27 - 200811233

〔丨丨(N嗽) Comparative Example 2-11 Resin 2-18 73.3 99.2 21.5 〇3360 (N o (N o lxlO10 Comparative Example 2-10 Measure 2-16 (N 73.7 99.2 21.2 〇〇〇3410 r-c&gt (N 〇lx 1010 Comparative Example 2-9 Resin 2-14 CN 74.4 99.1 20.5 inch 〇3290 VO 卜o CN C> lxlO16 Comparative Example 2-8 OBJECT 2-13 (N 78.5 99.0 17.8 〇1 1 3640 cn 卜o (N 〇lxlO16 Comparative Example 2-7 Deleted 2-10 (N 70.8 99.3 22.8 〇 3460 ο ο o (N 〇lx 1016 Comparative Example 2-6 雠 2-9 CN 73.5 99.2 21, 3 00 3370 卜o (N 〇lxlO16 Comparative Example 2-5 Resin 2-8 (N 80.1 98.6 16.7 inch c> 3690 in 卜o (N lxlO16 Comparative Example - Μ.) Resin 2-6 (N 57.6 99.5 28.9 〇〇3620 卜o CN 〇lxlO16 Comparative Example—2-3—, Resin 2-4 (N 83.4 98.1 14.6 inch 〇3650 in 卜o (N 〇lxlO16 Comparative Example 2-2 観 2-3 CN 74.9 99.1 20.2 〇 3580 <N 〇卜o CN O' lxlO16 Comparative Example 2 删 Deletion 2-2 (N 76.9 99.1 1-1 ON 〇〇3710 CN 卜o (N 〇lxlO16 Resin molded body thickness (mm) Total light transmittance (%) Haze ( %) diffusivity (%) ) Brightness (cd/m2) Light resistance color difference ΔΕ 1 s 騣* an Heating deformation (mm) Antistatic surface specific resistance (Ω) Optical characteristics-28 - 200811233 [Table 2-5] Comparative Example 2-12 Comparative Example 2 ·13 Comparative Example 244 Comparative Example 2-15 Resin resin 2-21 Resin 2-23 Resin 2_1 Leakage 2-1 Molded body thickness (mm) 2 2 0.5 10 Optical properties Total light transmittance (%) 80.3 71.1 85.5 48.6 Haze (%) 98.5 99.3 96.8 99.8 Diffusion rate (%) 16.4 22.6 12.3 34.6 b値0.2 0.2 0.2 0.3 Brightness (cd/m2) 3670 3670 3860 3170 Light resistance color difference AE 0.3 1.3 0.7 0.4 Dimensional stability Water absorption warp (mm 1.3 0.2 1.5 0.4 Heat deformation (mm) 0.1 0.7 0.3 0.2 Antistatic surface specific resistance (Ω) lxlO16 lxlO16 lxlO16 lx 1016 The respective measurement methods of the obtained light-diffusing sheet are as follows. (1) Total light transmittance and haze: Measured according to ASTM D-100, using a HAZE meter (NDH-2000) manufactured by Nippon Denshoku Industries Co., Ltd. (2) Diffusion rate: The light transmittance of the light-receiving angle 〇° and the light transmittance of 170° by the light-receiving angle of 70° were measured by a variable angle photometer (GC5000L) manufactured by Nippon Denshoku Industries Co., Ltd., and calculated by the following formula. Diffusion rate (%) = (I7〇/I〇) X100 (3) Light resistance: The aging tester manufactured by Toyo Seiki Seisakusho Co., Ltd. and Atras CI65A were used, and the color difference ΔE after 400 hours of irradiation was measured. (4) Dimensional stability (absorption warping): The light-diffusing sheet cut into a size of 180 mm x 180 mm was placed in an atmosphere of 50 ° C and a humidity of 80% for 7 days, and the amount of deformation of the four corners before and after the placement was measured by a cursor. The average 値 is made into a water-absorbent warp, which is used as a measure of dimensional stability. -29- 200811233 (5) Yellowness and chromatic aberration: L, a, and b are measured by a color difference meter (Σ-80) manufactured by Nippon Denshoku Co., Ltd., and b値 represents the scale of yellowness. In addition, the color difference of the light resistance evaluation is obtained by the following formula. △ E= ( ( LL,) 2+ ( aa,) 2 ( bb,) 2 ) 1/2 where L, a, b are the hue before the light resistance evaluation, and L', a', b' are light resistance. The hue after the evaluation (after 400 hours of irradiation). (6) Heat deformation: The light diffusion sheet cut into 300mm×300mm size is placed in an atmosphere of 80 °C for 7 days, and the deformation amount of the four corners after the placement is measured by a cursor, and the average 値 is used as the heat deformation. This is the measure of thermal stability. (7) Antistatic property: The surface of the molded body was measured for 24 hours at a temperature of 23 ° C and a humidity of 50% RH using a surface specific resistance measuring machine (R5 03 ) manufactured by KAWAGUCHI Co., Ltd. based on JIS K-6911. Intrinsic resistance 値, this 値 is used as a measure of antistatic properties. (8) Brightness: 9 cold cathode tubes with a diameter of 5 mm and a length of 200 mm were placed on the reflective sheet, and a light diffusion sheet cut into a size of 18 0 mm x 180 mm was placed at 5 mm on the cold cathode tube, and placed thereon. Diffusion film, prism sheet, and brightness enhancement film. The cold cathode tube was turned on in a dark room, and a total of 3 6 points were measured at 30 mm intervals using a topcon company brightness meter (BM-7) from the position of the light diffusion sheet at a distance of 10 mm to obtain an average enthalpy. The evaluation other than the light diffusion sheet was carried out as follows. (9) Refractive index: The unmelted compound was measured in an atmosphere of a wavelength of 589 nm at 23 ° C in an Abbe refractometer. Further, the styrene-based copolymer of phenethyl -30-200811233 was measured at a temperature of 25 ° C using a digital refractometer (RX-2 000 manufactured by ATAGO Co., Ltd.) using a saturated aqueous solution of potassium iodide in a contact liquid. (10) Determination of the unit content of methacrylic acid monomer in the styrene copolymer = _ I· Determination of the total amount of methacrylic monomer units and residual methacrylic acid in the styrene copolymer B 1 ) in 2 g of benzene To the ethylene-based copolymer, 100 ml of a chloroform:ethanol mixed solution (2:1) was added to dissolve. 2) Add 0.5% phenolphthalein/ethanol solution indicator and titrate with 0.1N potassium hydroxide and ethanol solution. The indicator color is the end point when it disappears in 30 seconds. 3) As a blank test, chloroform: ethanol mixed solution (2 ·· 1 ) and 100 ml of 2) were carried out in the same manner. 4) The methacrylic acid content in the styrene-based copolymer was determined by the following formula.

Methyl propylene content (%) = [ {(AB)xM} / (Sxl000)] xlOO Xin A: 1) Required titration (ml) B: 3) Required titration (mi) S : Benzene The mass of the ethylene-based copolymer (g) Μ : the mass of methylpropenic acid (8.6 (mg)) equivalent to 1 ml of 0.1 N potassium hydroxide and ethanol solution. II. Residue in the styrene copolymer The amount of methacrylic acid was measured by dissolving 5.5g of styrene-based copolymer in i〇ml of chloroform as 'internal standard using N,N-'dimethylformamide as the internal standard. 200811233 Conditions were measured. Device name: GC14B FID detector manufactured by Shimadzu Corporation Co., Ltd. Column: Glass cylinder Φ 3mmx3m Filling agent: Diethylene glycol succinate Carrier: Nitrogen

Temperature: column ll 〇 ° C, injection port 180 ° C III. The total amount of methacrylic monomer units and residual methacrylic acid in the styrene copolymer determined by I minus benzene determined by II The amount of methacrylic acid remaining in the storage copolymer is determined as the unit content of the methacrylic monomer in the styrene copolymer. When the measured enthalpy of methacrylic acid in the styrene-based copolymer is less than 0.1% by mass, the amount of residual methacrylic acid is 〇% by mass to determine the methacrylic monomer unit in the styrene-based copolymer. content. (1 1 ) Resin composition of a styrene-based copolymer: After dissolving a styrene-based copolymer in heavy chloroform, a 2% solution was prepared to prepare a sample, and FT-NMR (Model FX-90Q, manufactured by JEOL Ltd.) was used. 13 C-NMR was measured and calculated from the peak area of styrene and methyl methacrylate. [Industrial Applicability] The multilayer sheet of the present invention has excellent dimensional stability, light resistance, light diffusibility, antistatic property, and brightness, and is particularly suitable for a screen lens such as a light-transmitting screen which projects a screen such as a television. In addition, the Japanese Patent Application No. 32-200811233, filed on Jul. 19, 2006, and the entire contents of the application No. 2006- 209, 196, filed on August 1, 2006, The scope of the patent application, and the disclosure of the abstract, are extracted.

-33-

Claims (1)

200811233 X. Patent Application No. 1 · A styrene resin composition characterized by 90 to 99% by mass of styrene monomer units and 10 to 1% by mass (meth)acrylic acid for i 〇〇 by mass The styrene-based copolymer formed by the monomer unit contains a refractive index difference from the styrene-based copolymer of 〇. 5 to 0.15, and an average particle diameter of 1 to 10 parts by mass is 2 to 10//m. The unmelted compound, or 〇. 5 to 2.5 parts by mass of the average particle diameter of 1 to 1 0 // m of the polyorganosiloxane cross-linking ball and • 0.1 to 2 parts by mass of the hindered amine compound and 〇.1~ 2 parts by mass of a benzotriazole-based compound. 2. The styrene-based resin composition according to claim 1, wherein the unmelted compound is a crosslinked copolymer containing a (meth) acrylate monomer as a monomer unit. 3. The styrenic resin composition according to claim 1, wherein the unmelted compound is a crosslinked copolymer containing methyl methacrylate and η-butyl acrylate as a monomer unit. 4. The styrenic resin composition according to any one of claims 3 to 3, wherein the hindered amine compound is bis(2,2,6,6-tetra-methyl-4-piperidin Pyridyl) sebacate. 5. The styrenic resin composition according to any one of claims 1 to 4, wherein the benzotriazole compound is 2-(2Η-benzotriazol-2-yl)-4- (1,1,3,3-tetramethylbutyl)phenol. 6. The styrene-based resin composition according to any one of the items 1 to 5, wherein the styrene-based copolymer further contains 0.0005 to 0.5 part by mass of benzoxazole for 100 parts by mass of the styrene-based copolymer. An azole compound. -34- 200811233 7. The styrenic resin composition of claim 6 wherein the benzoxazole compound is 2,5-thiophenediyl (5-t-butyl-1,3-benzo) Oxazole). The styrene resin composition according to any one of the items 1 to 7, wherein the styrene resin composition further contains 0.1 to 3 masses for 100 parts by mass of the styrene copolymer. A portion of an amine surfactant, an anionic surfactant, and a non-amine nonionic surfactant. 9. The styrenic resin composition according to item 8 of the patent application, wherein the amine-based surfactant is hydrazine-hydroxyethyl-fluorenyl (2-hydroxyalkyl)amine. 1 . The styrene resin composition according to item 8 of the patent application, wherein the mixing ratio of the anionic surfactant and the non-amine nonionic surfactant is an anionic surfactant/non-amine nonionic interface activity Agent = 0.5/99.5 ~ 15/85 (mass ratio). 1 1 The styrene resin composition of claim 8 or 1 wherein the anionic surfactant is an organic sulfonic acid metal salt having a carbon number of 1 〇 to 14 and a non-amine nonionic interface. The active agent is a glycerin fatty acid ester. A molded article obtained by the styrene resin composition according to any one of claims 1 to 11, which is characterized by having a thickness of 1 to 7 mm. The molded article of claim 12, wherein the molded body is an injection molded body. The molded article of claim 12, wherein the formed body is an extruded body. A light-diffusing sheet characterized by using the molded article according to any one of the items 1 to 4 of the patent application. -36- 200811233 VII. Designated representative map: (1) The representative representative of the case is: None (2), the representative symbol of the representative figure is a simple description: None 8. If there is a chemical formula in this case, please reveal the chemical formula that best shows the characteristics of the invention: none -4-