JP2022118443A - Light-diffusing resin composition and compact thereof - Google Patents

Abstract

To provide a light-diffusing resin composition useful as an outdoor optical transparent member excellent in light permeability, weather resistance, hue, light diffusibility and steam resistance, and a compact formed from the light-diffusing resin composition.SOLUTION: The light-diffusing resin composition contains 0.05-10.0 pts.mass of a light diffusion agent (B) and 0.15-2.0 pts.mass of a malonic ester ultraviolet ray absorber (C) with respect to 100 pts.mass of an aromatic polycarbonate resin (A). The ratio c/b of the malonic ester ultraviolet ray absorber (c) to the amount of the light diffusion agent (b) is 0.2 or higher.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a light diffusing resin composition and a molded article thereof. In particular, a light diffusible resin composition having good light transmittance, weather resistance, excellent hue, light diffusibility and vapor resistance useful as an optical member for outdoor use, etc., and a molded article formed from the resin composition Regarding.

For applications that require light diffusion, such as various lighting covers, displays, automobile meters, and various nameplates, organic or inorganic light diffusing agents are dispersed in transparent resins such as aromatic polycarbonate resins, acrylic resins, and styrene resins. materials are widely used. Among such transparent resins, aromatic polycarbonate resins are particularly excellent in mechanical properties, heat resistance and weather resistance, and are widely used as resins with high light transmittance. Light diffusing agents include organic particles having a crosslinked structure, more specifically crosslinked acrylic particles, crosslinked silicone particles, crosslinked styrene particles, and the like. Furthermore, there are inorganic particles such as calcium carbonate, barium sulfate, aluminum hydroxide, silicon dioxide, titanium oxide and calcium fluoride, and inorganic fibers such as short glass fibers. Demand for materials made by dispersing a light diffusing agent in an aromatic polycarbonate resin is increasing due to its excellent heat resistance and mechanical properties as light sources become LEDs. There is a demand for further improvement in the optical properties of the polymer, particularly in the weather resistance.

Conventionally, a method of adding various ultraviolet absorbers is known as a method for improving the weather resistance of aromatic polycarbonates. For example, Patent Document 1 discloses a polycarbonate resin composition containing 5 parts by mass to 25 parts by mass of a benzotriazole-based ultraviolet absorber and 0.1 to 10 parts by mass of a fluorescent brightening agent with respect to 100 parts by mass of a polycarbonate resin. things are proposed. However, since the content of the ultraviolet absorber and the fluorescent whitening agent is high, gas is a problem during heat processing, and the longest absorption wavelength of the ultraviolet absorber is 390 nm, which is close to visible light, so the hue is poor, and the commercial value is low. was low.

Further, in Patent Document 2, 0.00 of an ultraviolet absorber selected from benzotriazole-based compounds, benzophenone-based compounds, and triazine-based compounds that do not have a maximum absorption wavelength in the ultraviolet region of 350 to 400 nm is added to 100 parts by mass of a polycarbonate resin. 05 parts by weight or more and less than 2 parts by weight, and 0.00001 to 1 part by weight of a fluorescent brightening agent. However, by blending an ultraviolet absorber selected from benzotriazole-based compounds, benzophenone-based compounds, and triazine-based compounds that do not have a maximum absorption wavelength of 350 to 400 nm, only a polycarbonate resin composition with a very poor hue was obtained.

On the other hand, Patent Documents 3 to 5 disclose resin compositions containing 0.0005 to 0.1 parts by mass of malonic acid esters with respect to 100 parts by mass of methyl methacrylate-based resins. There is no mention of at all.

Further, Patent Document 6 discloses a resin composition containing a malonic acid ester in an aromatic polycarbonate resin. However, specifically, the content of the malonic acid ester was small, and it was not sufficient to obtain a resin composition having an excellent balance between good weather resistance, color, and steam resistance.

Furthermore, Patent Document 7 discloses a light diffusing resin composition containing a light diffusing agent and a malonic acid ester in an aromatic polycarbonate resin. However, it was insufficient to obtain a resin composition having an excellent balance between weather resistance and light diffusion.

JP-A-07-196904 Japanese Patent Application Laid-Open No. 2002-003710 JP-A-2002-105271 JP-A-2003-025406 Japanese Patent Application Laid-Open No. 2003-026888 JP-A-2006-83230 JP 2006-117822 A

An object of the present invention is to solve all the problems of the prior art, and to provide light diffusion properties useful as an outdoor optical transparent member having excellent light transmission, weather resistance, hue, light diffusion and vapor resistance. An object of the present invention is to provide a resin composition and a molded article formed from the resin composition.

As a result of intensive studies to solve the above problems, the present inventors have found that by blending a light diffusing agent and a malonic ester-based ultraviolet absorber in a specific ratio with an aromatic polycarbonate resin, good light transmittance can be obtained. , a light diffusing resin composition useful as an optically transparent member for outdoor use having excellent weather resistance, hue, light diffusivity and vapor resistance, and a molded article formed from the resin composition to achieve the above objects. I found it and completed the present invention.
That is, according to the present invention, the following (configuration 1) to (configuration 5) are provided.

(Configuration 1)
Per 100 parts by mass of the aromatic polycarbonate resin (A), 0.05 to 10.0 parts by mass of the light diffusing agent (B) and 0.15 to 2.0 parts by mass of the malonic acid ester ultraviolet absorber (C). A light diffusing resin composition containing a part, characterized in that the ratio c/b of the amount (c) of the malonic ester-based ultraviolet absorber to the amount (b) of the light diffusing agent is 0.2 or more A light diffusing resin composition.

(Configuration 2)
The light diffusing resin composition according to Structure 1 above, containing 0.01 to 0.1 parts by mass of the heat stabilizer (D) with respect to 100 parts by mass of the aromatic polycarbonate resin (A).

(Composition 3)
2. The light diffusing resin composition according to Structure 2 above, wherein the heat stabilizer (D) is a phosphorus stabilizer represented by the following formula (X) and/or a sulfur stabilizer represented by the following formula (Y).

（式（Ｙ）中のＲはドデシル基を示す。）

(R in formula (Y) represents a dodecyl group.)

(Composition 4)
The light diffusing resin composition according to any one of the above configurations 1 to 3, containing 0.1 to 0.5 parts by mass of the release agent (E) with respect to 100 parts by mass of the aromatic polycarbonate resin (A). thing.
(Composition 5)
A molded article formed from the light-diffusing resin composition according to any one of Structures 1 to 4 above.

The light diffusible resin composition of the present invention can be used as an outdoor optical transparent member having excellent light transmittance, weather resistance, hue, light diffusion and vapor resistance without impairing the original properties of aromatic polycarbonate. It is a useful light-diffusing resin composition, and its industrial effects are exceptional.

The present invention will be described in detail below.

(Aromatic polycarbonate resin (A))
The aromatic polycarbonate resin used in the present invention is usually obtained by reacting a dihydroxy compound and a carbonate precursor by an interfacial polycondensation method or a melt transesterification method, or a carbonate prepolymer by a solid phase transesterification method. It is obtained by polymerizing or polymerizing a cyclic carbonate compound by a ring-opening polymerization method.

The dihydroxy component used here may be any dihydroxy component commonly used in aromatic polycarbonates, and may be bisphenols or aliphatic diols.

Examples of bisphenols include 4,4′-dihydroxybiphenyl, bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1- Phenylethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 1,1-bis(4-hydroxyphenyl)-3,3,5 -trimethylcyclohexane, 2,2-bis(4-hydroxy-3,3′-biphenyl)propane, 2,2-bis(4-hydroxy-3-isopropylphenyl)propane, 2,2-bis(3-t- Butyl-4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, 2,2-bis(3-bromo-4-hydroxyphenyl) Propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis(3-cyclohexyl-4-hydroxyphenyl)propane, 1,1-bis(3-cyclohexyl-4- hydroxyphenyl)cyclohexane, bis(4-hydroxyphenyl)diphenylmethane, 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 1,1-bis( 4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)cyclopentane, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, 4,4'-sulfonyldiphenol, 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxydiphenyl sulfide, 2,2'-dimethyl-4,4'-sulfonyldiphenol, 4,4'-dihydroxy- 3,3′-dimethyldiphenyl sulfoxide, 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfide, 2,2′-diphenyl-4,4′-sulfonyldiphenol, 4,4′-dihydroxy-3, 3′-diphenyldiphenylsulfoxide, 4,4′-dihydroxy-3,3′-diphenyldiphenylsulfide, 1,3-bis{2-(4-hydroxyphenyl)propyl}benzene, 1,4-bis{2-( 4-hydroxyphenyl)propyl}benzene, 1,4-bis(4-hydroxyphenyl)cyclohexane , 1,3-bis(4-hydroxyphenyl)cyclohexane, 4,8-bis(4-hydroxyphenyl)tricyclo[5.2.1.02,6]decane, 4,4′-(1,3-adamantane diyl)diphenol, 1,3-bis(4-hydroxyphenyl)-5,7-dimethyladamantane, and the following general formula [1]

(In general formula [1] above, R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ , R ¹⁷ and R ¹⁸ are each independently a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a substituted group having 6 to 12 carbon atoms. or an unsubstituted aryl group, c is a natural number, d is 0 or a natural number, and c+d is a natural number of 150 or less, and X is a divalent aliphatic group having 2 to 8 carbon atoms.)
A bisphenol compound having a siloxane structure represented by is mentioned.

Examples of aliphatic diols include 2,2-bis-(4-hydroxycyclohexyl)-propane, 1,14-tetradecanediol, octaethylene glycol, 1,16-hexadecanediol, 4,4'-bis(2- hydroxyethoxy)biphenyl, bis{(2-hydroxyethoxy)phenyl}methane, 1,1-bis{(2-hydroxyethoxy)phenyl}ethane, 1,1-bis{(2-hydroxyethoxy)phenyl}-1- Phenylethane, 2,2-bis{(2-hydroxyethoxy)phenyl}propane, 2,2-bis{(2-hydroxyethoxy)-3-methylphenyl}propane, 1,1-bis{(2-hydroxyethoxy ) phenyl}-3,3,5-trimethylcyclohexane, 2,2-bis{4-(2-hydroxyethoxy)-3,3′-biphenyl}propane, 2,2-bis{(2-hydroxyethoxy)- 3-isopropylphenyl}propane, 2,2-bis{3-t-butyl-4-(2-hydroxyethoxy)phenyl}propane, 2,2-bis{(2-hydroxyethoxy)phenyl}butane, 2,2 -bis{(2-hydroxyethoxy)phenyl}-4-methylpentane, 2,2-bis{(2-hydroxyethoxy)phenyl}octane, 1,1-bis{(2-hydroxyethoxy)phenyl}decane, 2 , 2-bis{3-bromo-4-(2-hydroxyethoxy)phenyl}propane, 2,2-bis{3,5-dimethyl-4-(2-hydroxyethoxy)phenyl}propane, 2,2-bis {3-cyclohexyl-4-(2-hydroxyethoxy)phenyl}propane, 1,1-bis{3-cyclohexyl-4-(2-hydroxyethoxy)phenyl}cyclohexane, bis{(2-hydroxyethoxy)phenyl}diphenylmethane , 9,9-bis{(2-hydroxyethoxy)phenyl}fluorene, 9,9-bis{4-(2-hydroxyethoxy)-3-methylphenyl}fluorene, 1,1-bis{(2-hydroxyethoxy ) phenyl}cyclohexane, 1,1-bis{(2-hydroxyethoxy)phenyl}cyclopentane, 4,4'-bis(2-hydroxyethoxy)diphenyl ether, 4,4'-bis(2-hydroxyethoxy )-3,3′-dimethyldiphenyl ether, 1,3-bis[2-{(2-hydroxyethoxy)phenyl}propyl]benzene, 1 ,4-bis[2-{(2-hydroxyethoxy)phenyl}propyl]benzene, 1,4-bis{(2-hydroxyethoxy)phenyl}cyclohexane, 1,3-bis{(2-hydroxyethoxy)phenyl} Cyclohexane, 4,8-bis{(2-hydroxyethoxy)phenyl}tricyclo[5.2.1.02,6]decane, 1,3-bis{(2-hydroxyethoxy)phenyl}-5,7-dimethyl adamantane, 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro(5,5)undecane, 1,4:3,6-dianhydro-D- sorbitol (isosorbide), 1,4:3,6-dianhydro-D-mannitol (isomannide), 1,4:3,6-dianhydro-L-iditol (isoidide) and the like.

Among these, aromatic bisphenols are preferred, and among them 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4 -hydroxy-3-methylphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 4,4'-sulfonyl Diphenol, 2,2'-dimethyl-4,4'-sulfonyldiphenol, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 1,3-bis{2-(4-hydroxyphenyl) Propyl}benzene and 1,4-bis{2-(4-hydroxyphenyl)propyl}benzene are preferred, especially 2,2-bis(4-hydroxyphenyl)propane, 1,1-bis(4-hydroxy Phenyl)cyclohexane, 2,2-bis(4-hydroxy-3-methylphenyl)propane and 9,9-bis(4-hydroxy-3-methylphenyl)fluorene are preferred. Among them, 2,2-bis(4-hydroxyphenyl)propane, which has excellent strength and good durability, is most preferable. Moreover, these may be used alone or in combination of two or more.

The polycarbonate resin used in the present invention is preferably a polycarbonate resin comprising a repeating unit represented by the following general formula [2].

[In the above general formula [2], R ¹ and R ² are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, cycloalkyl group having 20 carbon atoms, cycloalkoxy group having 6 to 20 carbon atoms, alkenyl group having 2 to 10 carbon atoms, aryl group having 6 to 14 carbon atoms, aryloxy group having 6 to 14 carbon atoms, carbon atom represents a group selected from the group consisting of an aralkyl group having 7 to 20 carbon atoms, an aralkyloxy group having 7 to 20 carbon atoms, a nitro group, an aldehyde group, a cyano group and a carboxyl group; a and b are each an integer of 1 to 4, and W is at least one group selected from the group consisting of a single bond or groups represented by the following general formulas [3] and [4] .

(In general formula [3] above, R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ and R ¹⁰ are each independently a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a carbon represents a group selected from the group consisting of an aryl group having 6 to 14 atoms and an aralkyl group having 7 to 20 carbon atoms, and R ¹¹ and R ¹² each independently represents a hydrogen atom, a halogen atom, or a an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, a cycloalkoxy group having 6 to 20 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, and 6 carbon atoms. an aryl group of up to 14, an aryloxy group of 6 to 10 carbon atoms, an aralkyl group of 7 to 20 carbon atoms, an aralkyloxy group of 7 to 20 carbon atoms, a nitro group, an aldehyde group, a cyano group and a carboxyl group represents a group selected from the group consisting of, when there are more than one, they may be the same or different, c is an integer of 1 to 10, and d is an integer of 4 to 7.)]

(In general formula [4] above, R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ , R ¹⁷ and R ¹⁸ are each independently a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a substituted group having 6 to 12 carbon atoms. or an unsubstituted aryl group, c is a natural number, d is 0 or a natural number, and c+d is a natural number of 150 or less, and X is a divalent aliphatic group having 2 to 8 carbon atoms.)

The polycarbonate resin used in the present invention may be a branched polycarbonate resin by using a branching agent in combination with the above dihydroxy compound. Examples of trifunctional or higher polyfunctional aromatic compounds used in such branched polycarbonate resins include phloroglucine, phloroglucide, or 4,6-dimethyl-2,4,6-tris(4-hydroxydiphenyl)heptene-2,2 ,4,6-trimethyl-2,4,6-tris(4-hydroxyphenyl)heptane, 1,3,5-tris(4-hydroxyphenyl)benzene, 1,1,1-tris(4-hydroxyphenyl) ethane, 1,1,1-tris(3,5-dimethyl-4-hydroxyphenyl)ethane, 2,6-bis(2-hydroxy-5-methylbenzyl)-4-methylphenol, 4-{4-[ trisphenols such as 1,1-bis(4-hydroxyphenyl)ethyl]benzene}-α,α-dimethylbenzylphenol, tetra(4-hydroxyphenyl)methane, bis(2,4-dihydroxyphenyl)ketone, 1, 4-bis(4,4-dihydroxytriphenylmethyl)benzene, or trimellitic acid, pyromellitic acid, benzophenonetetracarboxylic acid and acid chlorides thereof, among others, 1,1,1-tris(4-hydroxy Phenyl)ethane and 1,1,1-tris(3,5-dimethyl-4-hydroxyphenyl)ethane are preferred, and 1,1,1-tris(4-hydroxyphenyl)ethane is particularly preferred.

These polycarbonate resins are produced by reaction means known per se for producing ordinary aromatic polycarbonate resins, for example, a method of reacting an aromatic dihydroxy component with a carbonate precursor such as phosgene or carbonic acid diester. Basic means of the manufacturing method will be briefly described.

Reactions using, for example, phosgene as a carbonate precursor are usually carried out in the presence of an acid binder and a solvent. Examples of acid binders include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, and amine compounds such as pyridine. Halogenated hydrocarbons such as methylene chloride and chlorobenzene are used as the solvent. A catalyst such as a tertiary amine or a quaternary ammonium salt may also be used to accelerate the reaction. At that time, the reaction temperature is usually 0 to 40° C., and the reaction time is several minutes to 5 hours. The transesterification reaction using a carbonic acid diester as a carbonate precursor is carried out by a method in which a predetermined proportion of the aromatic dihydroxy component is stirred with the carbonic acid diester under an inert gas atmosphere while heating to distill off the resulting alcohol or phenol. . Although the reaction temperature varies depending on the boiling point of the alcohol or phenol to be produced, it is usually in the range of 120 to 300°C. The reaction is completed under reduced pressure from the initial stage while the alcohol or phenols produced are distilled off. Also, a catalyst commonly used for transesterification can be used to accelerate the reaction. Carbonic acid diesters used in the transesterification reaction include, for example, diphenyl carbonate, dinaphthyl carbonate, bis(diphenyl) carbonate, dimethyl carbonate, diethyl carbonate, and dibutyl carbonate. Among these, diphenyl carbonate is particularly preferred.

In the present invention, a terminal terminator is used in the polymerization reaction. A terminal terminator is used for molecular weight control, and the obtained polycarbonate resin is end-capped, so that it has excellent thermal stability as compared to other resins. Monofunctional phenols represented by the following general formulas [5] to [7] can be shown as such a terminal terminator.

[In the formula, A is a hydrogen atom, an alkyl group having 1 to 9 carbon atoms, an alkylphenyl group (wherein the alkyl moiety has 1 to 9 carbon atoms), a phenyl group, or a phenylalkyl group (wherein the alkyl moiety has 1 to 9 carbon atoms). and r is an integer from 1 to 5, preferably from 1 to 3].

[Wherein, X is -R-O-, -R-CO-O- or -R-O-CO-, where R is a single bond or a double bond having 1 to 10 carbon atoms, preferably 1 to 5 represents a valent aliphatic hydrocarbon group, and n represents an integer of 10-50. ]

Specific examples of monofunctional phenols represented by the general formula [5] include phenol, isopropylphenol, p-tert-butylphenol, p-cresol, p-cumylphenol, 2-phenylphenol, 4-phenyl phenol, isooctylphenol, and the like. Further, the monofunctional phenols represented by the above general formulas [6] to [7] are phenols having a long-chain alkyl group or an aliphatic ester group as a substituent. When the is blocked, they not only function as a terminal terminator or a molecular weight modifier, but also improve the melt fluidity of the resin, facilitating the molding process, and also have the effect of lowering the water absorption of the resin, which is preferable. used. The substituted phenols represented by the above general formula [6] preferably have n of 10 to 30, particularly 10 to 26. Specific examples thereof include decylphenol, dodecylphenol, tetradecylphenol, hexadecylphenol, octadecylphenol, Examples include eicosylphenol, docosylphenol and triacontylphenol. As the substituted phenols of the above general formula [7], compounds in which X is -R-CO-O- and R is a single bond are suitable, and n is 10 to 30, particularly 10 to 26. Specific examples include decyl hydroxybenzoate, dodecyl hydroxybenzoate, tetradecyl hydroxybenzoate, hexadecyl hydroxybenzoate, eicosyl hydroxybenzoate, docosyl hydroxybenzoate and triacontyl hydroxybenzoate. Among these monofunctional phenols, monofunctional phenols represented by the general formula [5] are preferable, more preferably alkyl-substituted or phenylalkyl-substituted phenols, and particularly preferably p-tert-butylphenol, p - cumylphenol or 2-phenylphenol. These monofunctional phenolic terminal terminating agents are desirably introduced into at least 5 mol %, preferably at least 10 mol % of all terminals of the obtained polycarbonate resin. may be used alone or in combination of two or more.

The polycarbonate resin used in the present invention may be a polyester carbonate obtained by copolymerizing an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, or a derivative thereof, within the scope of the present invention.

The viscosity average molecular weight of the polycarbonate resin used in the present invention is preferably in the range of 13,000 to 50,000, more preferably 16,000 to 30,000, even more preferably 18,000 to 28,000. , 19,000 to 26,000 is most preferred. If the molecular weight exceeds 50,000, the melt viscosity may become too high, resulting in poor moldability. The viscosity-average molecular weight referred to in the present invention is obtained by first using an Ostwald viscometer from a solution obtained by dissolving 0.7 g of a polycarbonate resin in 100 ml of methylene chloride at 20 ° C. to obtain the specific viscosity calculated by the following formula. The viscosity-average molecular weight M is determined by inserting the specific viscosity into the following equation.
Specific viscosity (η _SP ) = (tt ₀ )/t ₀
[t ₀ is the number of seconds the methylene chloride falls, t is the number of seconds the sample solution falls]
η _SP /c=[η]+0.45×[η] ² c (where [η] is the intrinsic viscosity)
[η]=1.23×10 ⁻⁴ M ^0.83
c=0.7

The polycarbonate resin used in the present invention preferably has a total Cl (chlorine) content of 0 to 200 ppm, more preferably 0 to 150 ppm. If the total amount of Cl in the polycarbonate resin exceeds 200 ppm, the hue and heat stability will deteriorate, which is not preferred.

(Light diffusing agent (B))
The light diffusing agent used in the present invention may be either organic microparticles represented by polymer microparticles or inorganic microparticles. Crosslinked particles obtained by polymerizing a non-crosslinkable monomer and a crosslinkable monomer are typically exemplified as polymer fine particles. In addition to such monomers, other copolymerizable monomers can also be used. Among them, polymer microparticles are preferable, and crosslinked particles can be particularly preferably used.

Examples of monomers used as non-crosslinking monomers in such crosslinked particles include non-crosslinking vinyl-based monomers such as acrylic monomers, styrene-based monomers and acrylonitrile-based monomers, and olefin-based monomers.

Examples of acrylic monomers include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, and phenyl methacrylate alone or in combination. can be used as Among these, methyl methacrylate is particularly preferred.

As the styrene-based monomer, styrene, alkylstyrene such as α-methylstyrene, methylstyrene (vinyltoluene) and ethylstyrene, and halogenated styrene such as brominated styrene can be used, and styrene is particularly preferred. .

Acrylonitrile and methacrylonitrile can be used as acrylonitrile-based monomers. Ethylene and various norbornene type compounds can be used as olefinic monomers. Further, other copolymerizable monomers can be exemplified by glycidyl methacrylate, N-methylmaleimide, maleic anhydride, and the like. The organic crosslinked particles of the present invention can also have units such as N-methylglutarimide as a result.

On the other hand, crosslinkable monomers for such non-crosslinkable vinyl monomers include, for example, divinylbenzene, allyl methacrylate, triallyl cyanurate, triallyl isocyanate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, propylene glycol. (Meth)acrylates, 1,6-hexanediol di(meth)acrylate, trimethylolpropane (meth)acrylate, pentaerythritol tetra(meth)acrylate, bisphenol A di(meth)acrylate, dicyclopentanyl di(meth)acrylate , dicyclopentenyl di(meth)acrylate, and N-methylol(meth)acrylamide. Other crosslinked particles include silicone crosslinked particles typified by polyorganosilsesquioxane.

The average particle size of the light diffusing agent used in the present invention is preferably 0.01-50 μm, more preferably 1-30 μm, still more preferably 2-30 μm. If the average particle size is less than 0.01 μm or more than 50 μm, light diffusibility may be insufficient. Such an average particle size is represented by the 50% value (D50) of the cumulative distribution of particle sizes determined by a laser diffraction/scattering method. The particle size distribution may be single or multiple. That is, it is possible to combine two or more light diffusing agents having different average particle diameters. However, more preferred light diffusing agents are those with a narrow particle size distribution. It is more preferable to have a distribution in which 70% by mass or more of the particles are contained in the range of 2 μm before and after the average particle diameter. The shape of the light diffusing agent is preferably nearly spherical from the viewpoint of light diffusion, and more preferably nearly spherical. Such spherical shapes include elliptical spheres.

The refractive index of the light diffusing agent used in the present invention is preferably in the range of 1.30 to 1.80, more preferably 1.33 to 1.70, still more preferably 1.35 to 1.65. be. These exhibit a sufficient light diffusing function when blended in the resin composition.

The content of the light diffusing agent used in the present invention is 0.05 to 10.0 parts by mass, preferably 0.1 to 7.0 parts by mass, with respect to 100 parts by mass of the aromatic polycarbonate resin component. More preferably 0.15 to 5.0 parts by mass, still more preferably 0.2 to 2.0 parts by mass. When the content of the light diffusing agent is less than 0.05 parts by mass, sufficient light diffusibility cannot be obtained, and when it exceeds 10 parts by mass, the total light transmittance and weather resistance are lowered.

(Malonic acid ester-based ultraviolet absorber (C))
The UV absorber used in the present invention is a malonic acid ester UV absorber. From the viewpoint of durability, 2-(1-arylalkylidene)malonic acid esters are preferably used as the malonic acid ester-based ultraviolet absorber. Malonic acid ester-based UV absorbers are commercially available such as Hostavin PR-25 manufactured by Clariant Japan KK and Hostavin B-CAP manufactured by Clariant Japan KK.

The amount of the malonic acid ester-based ultraviolet absorber used is 0.15 to 2.0 parts by mass, preferably 0.2 to 1.6 parts by mass, and 0.25 to 1 part by mass with respect to 100 parts by mass of the aromatic polycarbonate. 0.0 parts by weight is more preferred, and 0.3 to 0.5 parts by weight is even more preferred. If it is less than 0.15 parts by mass, sufficient weather resistance cannot be obtained. And it is not preferable because it causes a decrease in mechanical strength.

When light is transmitted through a molded article made of a light diffusing resin composition, the light diffuses in the molded article compared to a molded article made of a transparent resin, and the light transmission path becomes longer. It is necessary to use sufficient UV absorber against Specifically, the ratio c/b of the amount (c) of the malonic acid ester-based ultraviolet absorber to the amount (b) of the light diffusing agent must be 0.2 or more, and 0.25 or more. It is preferably 0.3 or more, more preferably 0.5 or more. If c/b is less than 0.2, sufficient weather resistance cannot be obtained, which is not preferred.

(Heat stabilizer (D))
The heat stabilizer (D) preferably used in the present invention is preferably a phosphorus heat stabilizer and/or a sulfur heat stabilizer.

A phosphite or a phosphate is preferred as the phosphorus-based heat stabilizer. Phosphites include triphenylphosphite, trisnonylphenylphosphite, tris(2,4-di-tert-butylphenyl)phosphite, trinonylphosphite, tridecylphosphite and trioctylphosphite. , trioctadecyl phosphite, distearyl pentaerythritol diphosphite, tricyclohexyl phosphite, monobutyl diphenyl phosphite, monooctyl diphenyl phosphite, distearyl pentaerythritol diphosphite, bis(2,4-di-tert-butyl phenyl)pentaerythritol phosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol phosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octylphosphite, etc. and phosphorous acid triesters, diesters, and monoesters.

Examples of phosphoric acid esters include trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, triphenyl phosphate, tricresyl phosphate, tris(nonylphenyl) phosphate, 2-ethylphenyldiphenyl phosphate, tetrakis(2,4- di-tert-butylphenyl)-4,4-diphenylenephosphonite and the like.

Among phosphorus-based heat stabilizers, tris(2,4-di-tert.-butylphenyl)phosphite represented by the above formula (X) is preferred. Specifically, "IRGAFOS 168 FF" manufactured by BASF is commercially available.

Examples of sulfur-based heat stabilizers include dilauryl-3,3'-thiodipropionate, ditridecyl-3,3'-thiodipropionate, dimyristyl-3,3'-thiodipropionate, distearyl -3,3'-thiodipropionate, laurylstearyl-3,3'-thiodipropionate, pentaerythritol tetrakis(3-laurylthiopropionate), bis[2-methyl-4-(3- laurylthiopropionyloxy)-5-tert-butylphenyl]sulfide, octadecyl disulfide, mercaptobenzimidazole, 2-mercapto-6-methylbenzimidazole, 1,1′-thiobis(2-naphthol) and the like.

Among sulfur-based heat stabilizers, pentaerythritol tetrakis(3-laurylthiopropionate) represented by the above formula (Y) is preferred. Specifically, "Sumilizer TP-D" manufactured by Sumitomo Chemical Co., Ltd. is commercially available.

The amount of the heat stabilizer used is preferably 0.01 to 0.1 parts by mass, more preferably 0.02 to 0.08 parts by mass, and 0.03 to 0.07 parts by mass with respect to 100 parts by mass of the aromatic polycarbonate resin. Part is more preferred. Within the above range, sufficient thermal stability can be obtained, and the steam resistance is excellent.

(Release agent (E))
Release agents preferably used in the present invention include, for example, fatty acid esters, polyolefin waxes (polyethylene waxes, 1-alkene polymers, etc.), and those modified with functional group-containing compounds such as acid modification are also used. can be used), fluorine compounds (such as fluorine oil represented by polyfluoroalkyl ether), paraffin wax, and beeswax. Among these, fatty acid esters are preferred from the viewpoints of ease of availability, releasability and transparency.

The content of such a release agent is preferably 0.1 to 0.5 parts by mass, more preferably 0.15 to 0.4 parts by mass, and still more preferably 0 parts by mass with respect to 100 parts by mass of the aromatic polycarbonate resin. .2 to 0.3 parts by mass. Within the above range, the releasability is good, the steam resistance is excellent, and mold contamination during molding is reduced.

Among the release agents, fatty acid esters are preferably used. Fatty acid esters are esters of fatty alcohols and fatty carboxylic acids. The aliphatic alcohol may be a monohydric alcohol or a dihydric or higher polyhydric alcohol. The carbon number of the alcohol is preferably in the range of 3-32, more preferably in the range of 5-30. Examples of such monohydric alcohols include dodecanol, tetradecanol, hexadecanol, octadecanol, eicosanol, tetracosanol, ceryl alcohol, and triacontanol. Such polyhydric alcohols include pentaerythritol, dipentaerythritol, tripentaerythritol, polyglycerol (triglycerol-hexaglycerol), ditrimethylolpropane, xylitol, sorbitol, and mannitol. Among fatty acid esters, polyhydric alcohols are more preferred.

On the other hand, the aliphatic carboxylic acid preferably has 3 to 32 carbon atoms, more preferably 10 to 22 carbon atoms. Examples of the aliphatic carboxylic acid include decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid (palmitic acid), heptadecanoic acid, octadecanoic acid (stearic acid), nonadecanic acid, icosanoic acid, and docosanoic acid (behenic acid), and unsaturated aliphatic carboxylic acids such as palmitoleic acid, oleic acid, linoleic acid, linolenic acid, eicosenoic acid, eicosapentaenoic acid, and cetoleic acid. can. Among the above, the aliphatic carboxylic acid preferably has 14 to 20 carbon atoms. Of these, saturated aliphatic carboxylic acids are preferred. Since such aliphatic carboxylic acids are usually produced from natural fats and oils such as animal fats (such as beef tallow and lard) and vegetable fats (such as palm oil), these aliphatic carboxylic acids usually have a number of carbon atoms is a mixture containing other carboxylic acid components with different Therefore, even in the production of aliphatic carboxylic acids, they are produced from such natural fats and oils and are in the form of mixtures containing other carboxylic acid components. The acid value of the fatty acid ester is preferably 20 or less (can be substantially 0). However, in the case of a full ester (full ester), it preferably contains not a small amount of free fatty acid in order to improve releasability. Further, the iodine value of the fatty acid ester is preferably 10 or less (can be substantially 0). These properties can be obtained by the method specified in JIS K 0070.

The aforementioned fatty acid ester may be either a partial ester or a full ester, but partial esters are preferred in terms of better releasability and durability, and glycerol monoesters are particularly preferred. Glycerin monoesters are mainly composed of monoesters of glycerin and fatty acids, and suitable fatty acids include saturated fatty acids such as stearic acid, palmitic acid, behenic acid, arachidic acid, montanic acid, and lauric acid, oleic acid, and linoleic acid. , and unsaturated fatty acids such as sorbic acid, and particularly preferred are those based on glycerin monoesters of stearic acid, behenic acid and palmitic acid. Such fatty acids are synthesized from natural fatty acids and are mixed as described above. Even in such a case, the proportion of glycerin monoester in the fatty acid ester is preferably 60% by mass or more.

Partial esters are often inferior to full esters in terms of thermal stability. To improve the thermal stability of such partial esters, the partial esters preferably have a sodium metal content of less than 20 ppm, more preferably less than 5 ppm, and even more preferably less than 1 ppm. A fatty acid partial ester having a sodium metal content of less than 1 ppm can be produced by producing a fatty acid partial ester by a conventional method and then purifying it by molecular distillation or the like.

Specifically, after removing gas and low-boiling substances with a spray nozzle degassing device, glycerol is distilled under the conditions of a distillation temperature of 120 to 150 ° C. and a degree of vacuum of 0.01 to 0.03 kPa using a falling film distillation device. After removing polyhydric alcohols such as alcohol, a centrifugal molecular distillation apparatus is used to distill a high-purity fatty acid partial ester under the conditions of a distillation temperature of 160 to 230 ° C. and a degree of vacuum of 0.01 to 0.2 Torr. and the like, and sodium metal can be removed as a distillation residue. By repeatedly subjecting the obtained distillate to molecular distillation, it is possible to further increase the purity and obtain a fatty acid partial ester with an even lower sodium metal content. In addition, it is also important to thoroughly clean the inside of the molecular distillation apparatus in advance by an appropriate method, and to prevent contamination of the sodium metal component from the external environment by, for example, increasing airtightness. Such fatty acid esters are available from specialized vendors (eg, Riken Vitamin Co., Ltd.).

The light-diffusing resin composition of the present invention may optionally contain, for example, other ultraviolet absorbers (benzophenone-based, benzotriazole-based, hydroxyphenyltriazine-based, cyclic iminoester-based, cyanoacrylate-based, etc.) antistatic agents. , coloring agents, fluidity improvers, flame retardants, anti-agglomeration agents, etc. may be further added.

Mixing and kneading of the light diffusing resin composition of the present invention may be carried out by a method applied to ordinary thermoplastic resins, for example, ribbon blender, Henschel mixer, Banbury mixer, drum tumbler, single screw extruder, 2 A screw extruder, a multi-screw extruder, or the like can be used. Temperature conditions for kneading are usually 260 to 320°C.

The light-diffusing resin composition of the present invention can be applied to a general thermoplastic resin molding method, and for example, from the viewpoint of productivity, injection molding, injection compression molding, and extrusion molding from a pellet-shaped resin composition are possible. . Furthermore, it is also possible to obtain a desired molded body by vacuum forming, pressure forming, or the like from an extruded sheet-like molded body.

The light diffusing resin composition of the present invention preferably has a spectral light transmittance of 5% or less, more preferably 3% or less, and more preferably 1% or less at a wavelength of 350 nm when formed into a molded product having a thickness of 2 mm. More preferably: Also, the spectral light transmittance at a wavelength of 380 nm is preferably 30% or more, more preferably 40% or more, and even more preferably 45% or more. The molded article obtained from the light-diffusing resin composition of the present invention is characterized by low light transmittance in the ultraviolet region and high light transmittance in the visible light region. A molded article having such characteristics is also excellent in hue.

The light diffusing resin composition of the present invention preferably has a haze of 30% or more, more preferably 50% or more, and even more preferably 70% or more when formed into a molded product having a thickness of 2 mm. .

Examples of the molded article of the present invention include optical members such as lighting covers and lighting lenses.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.
Raw materials used in the following examples and comparative examples are as follows.

(Aromatic polycarbonate resin (A))
A-1: Panlite L-1225WX manufactured by Teijin Limited (polycarbonate resin made from bisphenol A, viscosity average molecular weight 19,700)
A-2: Panlite L-1225WP manufactured by Teijin Limited (polycarbonate resin made from bisphenol A, viscosity average molecular weight 22,500)
A-3: Polycarbonate resin powder having a branched structure with a viscosity average molecular weight of 25,100 obtained by the following method

A reactor equipped with a thermometer, a stirrer and a reflux condenser was charged with 2340 parts of ion-exchanged water, 947 parts of a 25% aqueous sodium hydroxide solution, and 0.7 parts of hydrosulfite, and 710 parts of bisphenol A was dissolved under stirring (bisphenol A solution ), 2299 parts of methylene chloride, 112 parts of a 48.5% aqueous sodium hydroxide solution, and an aqueous solution of 25% concentration of 1,1,1-tris(4-hydroxyphenyl)ethane dissolved in a 14% aqueous sodium hydroxide solution. 38.1 parts (1.00 mol %) was added, and 354 parts of phosgene was blown in over about 90 minutes at 15 to 25° C. to carry out a phosgenation reaction. After the completion of phosgenation, 219 parts of a methylene chloride solution of 11% p-tert-butylphenol and 88 parts of a 48.5% aqueous sodium hydroxide solution were added, stirring was stopped, and the mixture was allowed to stand for 10 minutes for separation, followed by stirring. After 5 minutes of emulsification, the mixture was treated with a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) at 1200 rpm and 35 baths to obtain a highly emulsified dope. The highly emulsified dope was reacted in a polymerization tank (with a stirrer) at a temperature of 35° C. for 3 hours without stirring to complete the polymerization. After completion of the reaction, the organic phase was separated, diluted with methylene chloride and washed with water, then acidified with hydrochloric acid and washed with water. The methylene chloride was evaporated under stirring to obtain a polycarbonate powder. After dehydration, it was dried at 120° C. for 12 hours with a hot air circulating dryer to obtain a polycarbonate resin powder having a branched structure.

A-4: Polycarbonate-polydiorganosiloxane copolymer resin powder having a viscosity-average molecular weight of 19,400 obtained by the following production method A reactor equipped with a thermometer, a stirrer, and a reflux condenser was charged with 21,591 parts of ion-exchanged water and 48.5% water. 3674 parts of an aqueous sodium oxide solution was added, and 3880 parts of 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) as the dihydroxy compound (I) constituting the carbonate structural unit represented by the above formula [1], and hydro After dissolving 7.6 parts of sulfite, 14565 parts of methylene chloride (14 mol per 1 mol of dihydroxy compound (I)) was added, and 1900 parts of phosgene was blown in at 22 to 30° C. for 60 minutes while stirring. . Next, a solution obtained by dissolving 1131 parts of a 48.5% aqueous sodium hydroxide solution and 108 parts of p-tert-butylphenol in 800 parts of methylene chloride is added, and the carbonate structural unit represented by the above formula [3] is formed while stirring. A solution obtained by dissolving 430 parts of a polydiorganosiloxane compound represented by the following formula [8] as a dihydroxyaryl-terminated polydiorganosiloxane (II) having an average number of repeating dimethylsiloxane units of about 37 in 1600 parts of methylene chloride was added to dihydroxyaryl The terminal polydiorganosiloxane (II) was added at a rate of 0.0008 mol/min per 1 mol of the dihydric phenol (I) to form an emulsified state, followed by vigorous stirring again. Under such stirring, 4.3 parts of triethylamine was added while the reaction solution was at 26° C., and stirring was continued for 45 minutes at a temperature of 26 to 31° C. to complete the reaction. After completion of the reaction, the organic phase was separated, diluted with methylene chloride and washed with water, then acidified with hydrochloric acid and washed with water. Then, the methylene chloride was evaporated with stirring to obtain a polycarbonate-polydiorganosiloxane copolymer resin powder. After dehydration, it was dried at 120° C. for 12 hours in a hot air circulating dryer to obtain a polycarbonate-polydiorganosiloxane copolymer resin powder. (Polydiorganosiloxane component content 8.2%, viscosity average molecular weight 19,400)

(Light diffusing agent (B))
B-1: Bead-shaped crosslinked acrylic particles (manufactured by Sekisui Plastics Co., Ltd.: MBX-5 (trade name), average particle size 5 μm)
B-2: Bead-shaped crosslinked silicone (manufactured by Momentive Performance Materials Japan LLC: TSR9002 (trade name), average particle size 2 μm)

(Malonic acid ester-based ultraviolet absorber (C))
C-1: Hostavin B-CAP manufactured by Clariant Japan Co., Ltd.
C-2: Hostavin PR-25 manufactured by Clariant Japan Co., Ltd.
(Other UV absorbers (comparative examples))
C-3: Chemisorb 79 manufactured by Chemipro Kasei Co., Ltd. (benzotriazole-based ultraviolet absorber)
C-4: BASF Tinuvin234 (benzotriazole-based UV absorber)
C-5: BASF Tinuvin1577ED (triazine-based UV absorber)
C-6: SEESORB703 manufactured by Shipro Kasei Co., Ltd. (benzotriazole-based ultraviolet absorber)
C-7: Adekastab LA-31 (benzotriazole-based UV absorber) manufactured by ADEKA Co., Ltd.

(Heat stabilizer (D))
Hostanox P-EPQ (phosphorus heat stabilizer) manufactured by Clariant Japan Co., Ltd.
BASF IRGAFOS168FF (phosphorus heat stabilizer, compound of formula (1))
Sumitomo Chemical Co., Ltd. Sumilizer TP-D (sulfur-based heat stabilizer, compound of formula (2))

(Release agent (E))
Unistar H-476-S (fatty acid ester) manufactured by NOF Corporation

Other ingredients F-114P: Perfluorobutanesulfonic acid potassium salt (manufactured by Dainippon Ink and Chemicals Co., Ltd.: Megafac F-114P (trade name))
SN3307:: Mixture of polytetrafluoroethylene particles and styrene-acrylic copolymer (manufactured by Shine Polymer: SN3307 (trade name))

(1) Preparation of test piece Using an injection molding machine [Sumitomo Heavy Industries Co., Ltd. SG150U/S-M IV], the molding temperature is 280 ° C., the mold temperature is 80 ° C., the width is 50 mm, the length is 90 mm, and the thickness is A three-tiered plate was molded with dimensions of 3.0 mm (length 20 mm), 2.0 mm (length 45 mm), and 1.0 mm (length 25 mm) from the gate side.

(2) Total light transmittance and haze The total light transmittance and haze of the test piece (thickness 2 mm) molded in (1) were measured using a reflection/transmittance meter HR-100 manufactured by Murakami Color Research Laboratory Co., Ltd. Measured according to JIS-K 7136.

(3) Spectral light transmittance (350 nm, 380 nm)
The light transmittance of the test piece (2 mm thick portion) molded in (1) above was measured using a UV-Vis-NIR spectrophotometer Cary 5000 manufactured by Agilent Technologies. When the spectral light transmittance at 350 nm is low and the spectral light transmittance at 380 nm is high, the hue is excellent.

(4) Weather resistance The test piece molded in (1) above is set to a black panel temperature of 63 ° C., a humidity of 50%, and an irradiance of 0.35 W / m2 (340 nm). , and removed after 500 hours. The test piece taken out was measured with a spectrophotometer CE-7000A manufactured by Sakata Inx Engineering Co., Ltd. under a D65 light source and a 10-degree field of view using a transmission method, and ΔE of the test piece was calculated. A smaller ΔE value is more preferable.

(5) Steam resistance The test piece molded in (1) above was subjected to wet heat treatment at 120 ° C. for 24 hours in a laboratory autoclave SN-510 manufactured by Yamato Scientific Co., Ltd. The viscosity average molecular weight of the treated test piece and The difference in viscosity average molecular weight (ΔMv×10 ⁻³ ) before treatment was calculated. A smaller ΔMv value is more preferable.
The viscosity-average molecular weight Mv is determined by using an Ostwald viscometer from a solution obtained by first dissolving 0.7 g of a test piece in 100 ml of methylene chloride at 20° C. to determine the specific viscosity (η _SP ) calculated by the following formula.
Specific viscosity (η _SP ) = (tt ₀ )/t ₀
[t ₀ is the number of seconds the methylene chloride falls, t is the number of seconds the sample solution falls]
The viscosity-average molecular weight Mv is calculated from the determined specific viscosity (η _SP ) by the following formula.
η _SP /c=[η]+0.45×[η] ² c (where [η] is the intrinsic viscosity)
[η]=1.23×10 ⁻⁴ Mv ^0.83
c=0.7

[Examples 1 to 18 and Comparative Examples 1 to 9]
After blending the raw materials in the proportions shown in Table 1, they were melt-kneaded at a cylinder temperature of 280° C. using a vented twin-screw extruder TEX30α manufactured by Japan Steel Works, Ltd. with a screw diameter of 30 mm, and pelletized by strand cutting. After drying the pellets at 120° C. for 5 hours, a test piece for evaluation was molded under the conditions described above, and the evaluation results were shown in Table 1.

INDUSTRIAL APPLICABILITY The light diffusing resin composition of the present invention is excellent in light transmittance, weather resistance, hue, light diffusibility and vapor resistance, and is useful as an optical transparent member for outdoor use.

Claims (5)

Per 100 parts by mass of the aromatic polycarbonate resin (A), 0.05 to 10.0 parts by mass of the light diffusing agent (B) and 0.15 to 2.0 parts by mass of the malonic acid ester ultraviolet absorber (C). A light diffusing resin composition containing a part, characterized in that the ratio c/b of the amount (c) of the malonic ester-based ultraviolet absorber to the amount (b) of the light diffusing agent is 0.2 or more A light diffusing resin composition. 2. The light diffusing resin composition according to claim 1, containing 0.01 to 0.1 parts by mass of the heat stabilizer (D) with respect to 100 parts by mass of the aromatic polycarbonate resin (A). 3. The light diffusing resin composition according to claim 2, wherein the heat stabilizer (D) is a phosphorus stabilizer represented by the following formula (X) and/or a sulfur stabilizer represented by the following formula (Y).

(R in formula (Y) represents a dodecyl group.) The light diffusing resin composition according to any one of claims 1 to 3, containing 0.1 to 0.5 parts by mass of a release agent (E) with respect to 100 parts by mass of the aromatic polycarbonate resin (A). thing. A molded article formed from the light-diffusing resin composition according to any one of claims 1 to 4.