JP6674526B1 - Aromatic polycarbonate resin composition and optical molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of properties such as heat resistance and mechanical strength originally possessed by a polycarbonate resin, to provide excellent thermal stability and high light transmittance, and to obtain light transmittance even when the obtained molded product is heated. An excellent aromatic polycarbonate resin composition is provided. An aromatic polycarbonate resin composition containing an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and a specific aromatic compound (D), 0.01 to 0.1 part by weight of the phosphorus-based antioxidant (B), 0.01 to 0.5 part by weight of the fatty acid ester (C), and 100 parts by weight of the polycarbonate resin (A), An aromatic polycarbonate resin composition comprising 0.0001 parts by weight or more and less than 0.05 parts by weight of an aromatic compound (D). [Selection diagram] None

Description

  The present invention relates to an aromatic polycarbonate resin composition and an optical molded product.

  Polycarbonate resins are excellent in impact resistance, heat resistance, transparency and the like, and thus have been conventionally used for molded products such as light guide plates, various lenses, and nameplates.

  For example, Patent Literature 1 discloses an aromatic polycarbonate resin composition for a light guide plate in which a stabilizer and a release agent are blended with an aromatic polycarbonate resin having a specific molecular weight and a specific molecular weight distribution.

  Patent Document 2 discloses a polycarbonate resin composition for optical molded products in which a fluorescent whitening agent is blended with a resin component in which a specific amount of a bead-like crosslinked acrylic resin having a specific diameter is blended with a polycarbonate resin.

  In addition, for example, Patent Literature 3 and Patent Literature 4 propose various resin compositions in which a polycarbonate resin and other materials are used in combination in order to obtain excellent light transmittance and improve the brightness of an optical member.

JP 2007-204737 A JP-A-09-020860 JP 2011-133647 A JP-A-11-158364

  However, the polycarbonate resin compositions disclosed in Patent Literature 3 and Patent Literature 4 have recently been required as materials for light guide plates (particularly, there is no decrease in light transmittance even when molding is performed at a high temperature for thin-wall molding). Requirement) cannot be sufficiently satisfied. Further, in recent years, even when a thin molded product (for example, a light guide plate) having a thickness of about 0.3 mm, which has been molded, is exposed for a very long time under a high temperature condition due to light irradiation or the like, a decrease in transparency is small ( Materials with low cloudiness or coloration are being sought.

  The present invention does not impair properties such as heat resistance and mechanical strength inherent to the polycarbonate resin, is excellent in thermal stability, has high light transmittance, and is formed into a thin 0.3 mm molded product. It is an object of the present invention to provide an aromatic polycarbonate resin composition that hardly causes a decrease in transparency (hardly causes white turbidity and coloring) even when a product (for example, a light guide plate) is exposed to a high temperature due to light irradiation or the like for a very long time. Aim.

The present inventors have conducted intensive studies in order to solve such problems, and as a result, have found that an aromatic polycarbonate resin (A), a phosphorus-based antioxidant (B), a fatty acid ester (C) and a specific aromatic compound (D A) containing an aromatic polycarbonate resin composition,
Aromatic polycarbonate resin composition containing 0.01 to 0.1 part by weight of phosphorus-based antioxidant (B) and a predetermined amount of fatty acid ester (C) based on 100 parts by weight of aromatic polycarbonate resin (A) However, it does not impair the inherent properties of polycarbonate resin such as heat resistance and mechanical strength, is excellent in thermal stability, has high light transmittance, and is formed into a thin molded product of about 0.3 mm (light guide plate). Has been found that even when exposed for a long time under high-temperature conditions such as irradiation of a light source, there is little decrease in transparency (it is hard to cause cloudiness or coloring), and the present invention has been completed.

That is, the present invention provides an aromatic polycarbonate resin composition containing an aromatic polycarbonate resin (A), a phosphorus-based antioxidant (B), a fatty acid ester (C), and an aromatic compound (D) represented by the following formula: And
With respect to 100 parts by weight of the aromatic polycarbonate resin (A), 0.01 to 0.1 part by weight of the phosphorus-based antioxidant (B), 0.01 to 0.5 part by weight of the fatty acid ester (C), And an aromatic polycarbonate resin composition comprising the aromatic compound (D) in an amount of 0.0001 to less than 0.05 part by weight, and an optical molded product obtained by molding the same.
formula:

  The polycarbonate resin composition of the present invention has excellent heat stability, excellent heat stability, high light transmittance, and a molded product obtained under hot weather without impairing the properties inherent to the polycarbonate resin, such as heat resistance and mechanical strength. Even when exposed for a long time under high temperature conditions such as environment and / or light source irradiation, the transparency is not easily reduced (it is hard to cause cloudiness or coloring). Therefore, even a thin molded product (light guide plate) having a thickness of about 0.3 mm, for example, is unlikely to cause a change in hue and deterioration (deterioration) in appearance, and is subject to a high temperature condition caused by an external environment or a light source. , Even if it is exposed for a long period of time, it hardly causes a decrease in transparency (hardly causes white turbidity or coloring), and has extremely high industrial utility value.

  Hereinafter, embodiments will be described in detail. However, an unnecessary detailed description may be omitted. For example, a detailed description of a well-known item or a redundant description of substantially the same configuration may be omitted. This is to prevent the following description from being unnecessarily redundant and to facilitate understanding by those skilled in the art.

  Note that the inventors provide the following description for those skilled in the art to fully understand the present invention, and are not intended to limit the claimed subject matter.

  The aromatic polycarbonate resin composition of the embodiment of the present invention contains an aromatic polycarbonate resin (A), a phosphorus-based antioxidant (B), a fatty acid ester (C), and a specific aromatic compound (D). According to the above, a polyether derivative (E), an epoxy compound (F) and / or other components can be contained.

  In the embodiment of the present invention, the “aromatic polycarbonate resin (A)” is a polycarbonate resin based on an aromatic compound, and is not particularly limited as long as an aromatic polycarbonate resin composition aimed at by the present invention can be obtained. Never. Examples of such an aromatic polycarbonate resin include, for example, a polymer obtained by a phosgene method of reacting various dihydroxydiaryl compounds with phosgene, or a transesterification method of reacting a dihydroxydiaryl compound with a carbonate such as diphenyl carbonate. it can. A representative example contains a polycarbonate resin made from 2,2-bis (4-hydroxyphenyl) propane (bisphenol A).

  As the dihydroxydiaryl compound, in addition to bisphenol A, for example, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, , 2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 1,1-bis (4-hydroxy- 3-tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis Bis (hydroxyaryl) alkanes such as (4-hydroxy-3,5-dichlorophenyl) propane; 1,1 Bis (hydroxyaryl) cycloalkanes such as bis (4-hydroxyphenyl) cyclopentane and 1,1-bis (4-hydroxyphenyl) cyclohexane; 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxy-3, Dihydroxy diaryl ethers such as 3'-dimethyl diphenyl ether; dihydroxy diaryl sulfides such as 4,4'-dihydroxy diphenyl sulfide; 4,4'-dihydroxy diphenyl sulfoxide; 4,4'-dihydroxy-3,3'-dimethyl diphenyl Dihydroxydiarylsulfoxides such as sulfoxide; dihydroxydiarylsulfones such as 4,4'-dihydroxydiphenylsulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone; Kill. These can be used alone or in combination. In addition to these, piperazine, dipiperidyl hydroquinone, resorcin, 4,4'-dihydroxydiphenyl and the like can be used in combination.

  Further, the dihydroxydiaryl compound may be used in combination with, for example, a trivalent or higher valent aromatic compound shown below.

  Examples of the trivalent or higher phenol compound include phloroglucin, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptene, 2,4,6-dimethyl-2,4,6- Tri- (4-hydroxyphenyl) -heptane, 1,3,5-tri- (4-hydroxyphenyl) -benzol, 1,1,1-tri- (4-hydroxyphenyl) -ethane and 2,2-bis -[4,4- (4,4'-dihydroxydiphenyl) -cyclohexyl] -propane.

  The viscosity average molecular weight of the aromatic polycarbonate resin (A) is preferably from 10,000 to 100,000, more preferably from 12,000 to 30,000. When producing such an aromatic polycarbonate resin (A), a molecular weight regulator, a catalyst and the like can be used as required.

The phosphorus-based antioxidant (B) in the embodiment of the present invention is not particularly limited as long as the aromatic polycarbonate resin composition targeted by the present invention can be obtained. It preferably contains a phosphate compound.

  In the aromatic polycarbonate resin composition of the embodiment of the present invention, the phosphorus antioxidant (B) is a phosphite compound represented by the following formula (1), and a phosphorus phosphite compound represented by the following formula (2). It is preferable to contain at least one compound selected from an acid ester compound, a phosphite compound represented by the following formula (3), and a phosphite compound represented by the following formula (4). The phosphorus-based antioxidant (B) acts together with the fatty acid ester (C) and the specific aromatic compound (D) described below to impair the inherent properties of the obtained polycarbonate resin composition such as heat resistance and mechanical strength. Even when a thin molded product (light guide plate) of about 0.3 mm that has been molded and processed is exposed to a light source for a long time under a high temperature condition due to excellent heat stability, high light transmittance, It is a component that reduces a decrease in transparency (hardly causes cloudiness or coloring).

  The phosphorus antioxidant (B) preferably contains, for example, a compound represented by the following formula (1).

Equation (1):
(Wherein, R ¹ represents an alkyl group having 1 to 20 carbon atoms, and a represents an integer of 0 to 3)

In the formula (1), R ¹ is an alkyl group having 1 to 20 carbon atoms, and more preferably an alkyl group having 1 to 10 carbon atoms.

  Examples of the compound represented by the formula (1) include triphenyl phosphite, tricresyl phosphite, tris (2,4-di-t-butylphenyl) phosphite, trisnonyl phenyl phosphite and the like. . Among these, tris (2,4-di-t-butylphenyl) phosphite is particularly preferable. For example, Irgafos 168 manufactured by BASF (“Irgafos” is a registered trademark of BSF SF Societas Europea) is commercially available. Is available at

  The phosphorus antioxidant (B) preferably contains, for example, a compound represented by the following formula (2).

Equation (2):
(Wherein, R ⁹ and R ¹⁰ each independently represent an alkyl group having 1 to 20 carbon atoms or an aryl group optionally substituted with an alkyl group, and b and c each independently represent 0 Represents an integer of 3 to 3)

  Examples of the compound represented by the formula (2) include bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite and phenylbisphenol A pentaerythritol diphosphite. Bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite is commercially available from ADEKA under the trade name "ADEKA STAB PEP-24G". ADK STAB PEP-36 ("ADK STAB" is a registered trademark) manufactured by ADEKA Corporation is commercially available.

  The phosphorus antioxidant (B) preferably contains, for example, a compound represented by the following formula (3).

Equation (3):
(Wherein, R ² , R ³ , R ⁵ and R ⁶ are each independently a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, Represents an alkylcycloalkyl group, an aralkyl group having 7 to 12 carbon atoms or a phenyl group, R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, X represents a single bond, a sulfur atom or a formula: —CHR. ^7- (where R ⁷ represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms), and A represents 1 to 8 carbon atoms. alkylene group or the formula: * - COR 8 - ^(wherein, R ⁸ represents a single bond or an alkylene group having 1 to 8 carbon atoms, * indicates a bond to the oxygen side) are represented by One of Y and Z is a hydroxyl group and an alcohol having 1 to 8 carbon atoms. A xy group or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.)

In the formula (3), R ² , R ³ , R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, 12 represents an alkylcycloalkyl group, an aralkyl group having 7 to 12 carbon atoms or a phenyl group.

  Here, examples of the alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group and a t-butyl group. Group, t-pentyl group, i-octyl group, t-octyl group, 2-ethylhexyl group and the like. Examples of the cycloalkyl group having 5 to 8 carbon atoms include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group. Examples of the alkylcycloalkyl group having 6 to 12 carbon atoms include a 1-methylcyclopentyl group, a 1-methylcyclohexyl group, and a 1-methyl-4-i-propylcyclohexyl group. Examples of the aralkyl group having 7 to 12 carbon atoms include a benzyl group, an α-methylbenzyl group, and an α, α-dimethylbenzyl group.

Preferably, R ² , R ³ and R ⁵ are each independently an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, or an alkylcycloalkyl group having 6 to 12 carbon atoms. . In particular, R ² and R ⁵ are preferably each independently a t-alkyl group such as a t-butyl group, a t-pentyl group, a t-octyl group, a cyclohexyl group, or a 1-methylcyclohexyl group. In particular, R ³ is a carbon number such as a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group, a t-butyl group, and a t-pentyl group. It is preferably an alkyl group of 1 to 5, more preferably a methyl group, a t-butyl group or a t-pentyl group.

R ⁶ is preferably a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms, and is preferably a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, or an i-propyl group. And n-butyl group, i-butyl group, sec-butyl group, t-butyl group, t-pentyl group and the like.

In the formula (3), R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms include the alkyl groups exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ . Particularly, R ⁴ is preferably a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and more preferably a hydrogen atom or a methyl group.

In the formula (3), X represents a single bond, a sulfur atom or a group represented by the formula: —CHR ⁷ —. Here, R ⁷ in the formula: —CHR ⁷ — represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group having 5 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms and the cycloalkyl group having 5 to 8 carbon atoms include the alkyl groups and cycloalkyl groups exemplified in the description of R ² , R ³ , R ^5, and R ⁶ , respectively. Can be In particular, X is a single bond, a methylene group, or a methylene group substituted with a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a t-butyl group, or the like. Preferably, it is a single bond.

In Formula (3), A represents an alkylene group having 1 to 8 carbon atoms or a group represented by the formula: * -COR < ⁸ >-. Examples of the alkylene group having 1 to 8 carbon atoms include methylene, ethylene, propylene, butylene, pentamethylene, hexamethylene, octamethylene, 2,2-dimethyl-1,3-propylene, and the like. And preferably a propylene group. R ⁸ in the formula: * -COR ^8- represents a single bond or an alkylene group having 1 to 8 carbon atoms. Examples of the alkylene group having 1 to 8 carbon atoms for R ⁸ include the alkylene groups exemplified in the description of A. R ⁸ is preferably a single bond or an ethylene group. Further, * in the formula: * -COR ^8- is a bond on the oxygen side, and indicates that the carbonyl group is bonded to the oxygen atom of the phosphite group.

In the formula (3), one of Y and Z represents a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or 1 to 8 carbon atoms. Represents an alkyl group. Examples of the alkoxy group having 1 to 8 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, a t-butoxy group, and a pentyloxy group. Examples of the aralkyloxy group having 7 to 12 carbon atoms include a benzyloxy group, an α-methylbenzyloxy group, and an α, α-dimethylbenzyloxy group. Examples of the alkyl group having 1 to 8 carbon atoms include the alkyl groups exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ .

  As the compound represented by the formula (3), for example, 2,4,8,10-tetra-t-butyl-6- [3- (3-methyl-4-hydroxy-5-t-butylphenyl) propoxy ] Dibenzo [d, f] [1,3,2] dioxaphosphepin, 6- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propoxy] -2,4,8, 10-tetra-t-butyldibenzo [d, f] [1,3,2] dioxaphosphepin, 6- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propoxy]- 4,8-di-t-butyl-2,10-dimethyl-12H-dibenzo [d, g] [1,3,2] dioxaphosphine, 6- [3- (3,5-di-t- Butyl-4-hydroxyphenyl) propionyloxy] -4,8-di-t-butyl-2,10 Dimethyl -12H- dibenzo [d, g] [1,3,2] dioxaphosphocin, and the like. Among these, particularly when the obtained aromatic polycarbonate resin composition is used in a field where optical characteristics are required, 2,4,8,10-tetra-t-butyl-6- [3- (3-methyl 4-Hydroxy-5-t-butylphenyl) propoxy] dibenzo [d, f] [1,3,2] dioxaphosphepin is suitable. For example, Sumilizer GP ("Sumitomo Chemical Co., Ltd." SUMILIZER "is commercially available as registered trademark).

  The phosphorus-based antioxidant (B) preferably contains, for example, a compound represented by the following formula (4).

Equation (4):

(Wherein, R ^{11 to} R ¹⁸ each independently represent an alkyl group or an alkenyl group having 1 to 3 carbon atoms. R ¹¹ and R ¹² , R ¹³ and R ¹⁴ , R ¹⁵ and R ¹⁶ , R ¹⁷ and R ¹⁸ and R ¹⁸ may be bonded to each other to form a ring, and R ^{19 to} R ²² each independently represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms. And X ^{1 to} X ⁴ each independently represent a single bond or a carbon atom, and when X ^{1 to} X ⁴ are a single bond, among R ^{11 to} R ²² , The functional group connected to the single bond is excluded from the general formula (4))

  Specific examples of the compound represented by the formula (4) include, for example, bis (2,4-dicumylphenyl) pentaerythritol diphosphite. This is a product of “Doverphos (registered trademark) S-9228” manufactured by Dover Chemical Company, and a product name of “ADK STAB PEP-45” manufactured by ADEKA Corporation (bis (2,4-dicumylphenyl) pentaerythritol diphosphite). It is commercially available as

  It is preferable that the phosphorus antioxidant (B) contains a compound represented by the general formula (1). The amount of the compound represented by the general formula (1) may be 20 to 100% by mass, preferably 30 to 100% by mass, and more preferably 40 to 100% by mass of the total amount of the phosphorus-based antioxidant (B). Is more preferable.

  It is preferable that the phosphorus antioxidant (B) contains at least one compound selected from phosphite compounds represented by the general formulas (1) and (2).

It is preferable to satisfy at least one selected from the following.
The phosphite compound represented by the formula (1) contains tris (2,4-di-t-butylphenyl) phosphite; and the phosphite ester represented by the formula (2) The compound contains 3,9-bis (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5,5] undecane .

  It is preferable that the phosphorus-based antioxidant (B) contains at least two compounds, and one of the at least two compounds is a compound represented by the general formula (1). In this case, the amount of the compound represented by the general formula (1) is preferably 20 to 90% by mass, more preferably 30 to 80% by mass based on the total amount of the phosphorus-based antioxidant (B). , 40 to 70% by mass.

  The amount of the phosphorus-based antioxidant (B) is 0.01 to 0.1 part by weight and 0.04 to 0.1 part by weight based on 100 parts by weight of the aromatic polycarbonate resin (A). Is preferable, and 0.04 to 0.08 parts by weight is more preferable. When the amount of the phosphorus-based antioxidant (B) is less than 0.01 part by weight, the effect of improving the light transmittance and the hue is insufficient. Conversely, when the amount of the phosphorus-based antioxidant (B) exceeds 0.1 part by weight, the effect of improving the light transmittance and the hue is insufficient.

  The fatty acid ester (C) acts together with the phosphorus-based antioxidant (B) and the specific aromatic compound (D) described below, and impairs the inherent properties of the obtained polycarbonate resin composition such as heat resistance and mechanical strength. It has excellent heat stability, high light transmittance, and is transparent even when a molded thin product (light guide plate) of about 0.3 mm is exposed for a long time under high temperature conditions such as irradiation of a light source. It is a component that reduces a decrease in the properties (it is difficult to cause cloudiness or coloring).

  For example, thermal deterioration (white turbidity or coloring) due to long-term light irradiation of an optical molded product molded from an aromatic polycarbonate resin composition by a light source (eg, an LED light source) is effectively prevented. When a molded article for optical use is subjected to severe conditions such as under hot weather and / or is continuously exposed to light for a long time, the surface temperature of the molded article may increase, and the aromatic polycarbonate contained in the aromatic polycarbonate resin composition may be used. Thermal degradation of the resin (A) may progress little by little. Furthermore, the fatty acid ester (C) in the resin composition can be gradually modified, which impairs the transparency (brightness or light transmittance) expected of the aromatic polycarbonate resin composition used for ordinary molded articles for optical use. In some cases, cloudiness or coloring (light to dark coloring) may occur on the product surface.

In view of this problem, the inventors of the present invention have made intensive studies and as a result, the specific aromatic compound (D) represented by the following formula is particularly effective as a compound that suppresses deterioration such as modification of the fatty acid ester (C) and coloring caused thereby. By adding the specific aromatic compound (D) before melt-kneading to obtain an aromatic polycarbonate resin composition, the deterioration of the fatty acid ester (C) in the molded article is suppressed, and white turbidity or coloring is suppressed. The present invention has been completed with the idea that the phenomenon (light to dark coloring) can be reduced or alleviated.
formula:

As the fatty acid ester (C), an ordinary condensation compound of an aliphatic carboxylic acid and an alcohol can be used.

  Examples of the aliphatic carboxylic acids include saturated or unsaturated monocarboxylic acids, dicarboxylic acids, and tricarboxylic acids. The aliphatic carboxylic acids also include alicyclic carboxylic acids. Among these, monocarboxylic acids and dicarboxylic acids having 6 to 36 carbon atoms are preferable, and saturated monocarboxylic acids having 6 to 36 carbon atoms are more preferable. The carboxylic acid preferably has 8 to 32 carbon atoms, more preferably 10 to 28 carbon atoms, and particularly preferably 12 to 24 carbon atoms.

  Specific examples of the aliphatic carboxylic acid include, for example, palmitic acid, stearic acid, valeric acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, serotinic acid, mericinic acid, tetratriacontanic acid , Montanic acid, glutaric acid, adipic acid, azelaic acid and the like.

  Examples of the alcohol include a saturated or unsaturated monohydric alcohol and a polyhydric alcohol, and these alcohols may have a substituent such as a fluorine atom, a chlorine atom, a bromine atom, and an aryl group. Among these, a saturated alcohol having 30 or less carbon atoms is preferable, and an aliphatic saturated monohydric alcohol and an aliphatic saturated polyhydric alcohol having 30 carbon atoms or less are more preferable. In addition, alicyclic alcohols are also included in the aliphatic alcohols. The carbon number of the alcohol is preferably 26 or less, more preferably 22 or less.

  Specific examples of the alcohol include, for example, octanol, decanol, dodecanol, tetradecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylol And propane and dipentaerythritol.

  The fatty acid ester (C) includes an ester of an aliphatic monocarboxylic acid and an aliphatic dicarboxylic acid having 6 to 36 carbon atoms and an aliphatic saturated monohydric alcohol and an aliphatic saturated polyhydric alcohol having 30 or less carbon atoms. More preferably, it contains an ester of an aliphatic monocarboxylic acid having 8 to 32 carbon atoms and an aliphatic saturated polyhydric alcohol having 26 or less carbon atoms, and more preferably an aliphatic monocarboxylic acid having 10 to 28 carbon atoms. It is more preferable to include an ester of an acid and an aliphatic saturated polyhydric alcohol having 22 or less carbon atoms.

  Specific examples of the fatty acid ester (C) include, for example, behenyl behenate, octyl dodecyl behenate, stearyl stearate, glycerin monopalmitate, glycerin monostearate, glycerin monooleate, glycerin distearate, glycerin tristearate Rates, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, pentaerythritol tetrastearate, and the like, and these may be used alone or in combination of two or more. it can. Among these, stearic acid esters such as glycerin monostearate and pentaerythritol distearate are preferable, and for example, RIQUEMAL S-100A (trade name) manufactured by Riken Vitamin Co., Ltd. and Unistar manufactured by NOF CORPORATION H476DP ("Unistar" is a registered trademark) is commercially available.

  The amount of the fatty acid ester (C) is 0.01 to 0.5 part by weight, preferably 0.03 to 0.5 part by weight, based on 100 parts by weight of the polycarbonate resin (A). More preferably, the amount is from 0.5 to 0.2 parts by weight. When the amount of the fatty acid ester (C) is less than 0.01 part by weight, the effect of suppressing yellowing and improving the hue is insufficient. Conversely, if the amount of the fatty acid ester (C) exceeds 0.5 parts by weight, the effect of improving the hue will be insufficient.

The aromatic polycarbonate resin composition of the embodiment of the present invention comprises an aromatic polycarbonate resin (A), a phosphorus-based antioxidant (B), a fatty acid ester (C), and an aromatic compound (D) represented by the following formula. An aromatic polycarbonate resin composition containing, if necessary, a polyether derivative (E), an epoxy compound (F) and / or other additives, and an aromatic polycarbonate resin composition obtained thereby. Irradiate light source with a thin molded product (light guide plate) of about 0.3 mm, which is excellent in thermal stability, has high light transmittance, and is molded without impairing the inherent heat resistance, mechanical strength and other properties of For example, even when exposed for a long period of time under high temperature conditions such as those described above, the decrease in transparency is small (it is difficult to cause cloudiness or coloring).
formula:

  For example, thermal deterioration (white turbidity or coloring) due to long-term light irradiation of an optical molded product molded from an aromatic polycarbonate resin composition by a light source (eg, an LED light source) is effectively prevented. When the optical molded product is subjected to severe conditions such as under hot sun and / or is continuously irradiated with light for a long time, the temperature of the surface of the molded product may increase, and the fatty acid ester (C) and the polyether as required The derivative (E) is denatured by the influence of heat, and the thermal deterioration of the aromatic polycarbonate resin (A) contained in the aromatic polycarbonate resin composition may progress little by little.

  In view of this problem, the inventors of the present invention have conducted intensive studies and as a result, as a compound that suppresses deterioration such as modification of fatty acid ester (C) or polyether derivative (E) as required, a specific aromatic compound represented by the above formula (D) is particularly effective. By adding the specific aromatic compound (D) in advance or adding it before melt-kneading to obtain an aromatic polycarbonate resin composition, the fatty acid ester in the molded article can be obtained. The present invention has been completed with the idea that the deterioration of (C) and the necessary polyether derivative (E) can be suppressed to reduce or alleviate the clouding or coloring (light to dark coloring) phenomenon.

  The amount of the specific aromatic compound (D) used in the embodiment of the present invention is 0.0001 or more and less than 0.05 part by weight based on 100 parts by weight of the aromatic polycarbonate resin (A), and is 0.0005. The content is preferably from not less than 0.003 parts by weight to not more than 0.003 parts by weight. When the amount of the aromatic compound (D) is less than 0.0001 part by weight, the effect of suppressing cloudiness or coloring is insufficient. Conversely, if the amount of the aromatic compound (C) is 0.05 parts by weight or more, it may not be possible to achieve a high level of light transmittance and hue required for an optical molded article, which is not desirable.

  In the embodiment of the present invention, as described above, a polyether derivative (E) may be further contained as necessary. The polyether derivative is a derivative of a polyether compound, and is not particularly limited as long as an aromatic polycarbonate resin composition aimed at by the present invention can be obtained. Such a polyether derivative typically contains a polyether derivative represented by the following formula (5).

Equation (5):
RO- (XO) m (YO) n-R '
(Wherein, R and R ′ each independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents a linear alkylene group or a branched alkylene group having 2 to 4 carbon atoms, and Y represents Represents a linear alkylene group or a branched alkylene group having 2 to 5 carbon atoms, X and Y may be the same or different, m and n each independently represent 3 to 60, and m + n represents 6 to 120.)
The weight average molecular weight of the polyether derivative represented by the formula (5) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.
As the polyether derivative represented by the formula (5), a commercially available product can be used.

The polyether derivative represented by the formula (5) is preferably represented by the following formula (5-1).
The following formula (5-1):
RO- (XO) m (YO) n-R '
(Wherein, R and R ′ each independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents a straight-chain alkylene group having 2 to 4 carbon atoms, and Y represents 5 represents a branched alkylene group, m and n each independently represent 3 to 60, and m + n represents 8 to 90.)
The weight average molecular weight of the polyether derivative represented by the formula (5-1) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.
As the polyether derivative represented by the formula (5-1), a commercially available product can be used.

The polyether derivative represented by the formula (5) is preferably represented by the following formula (5-2).
The following formula (5-2):
RO- (XO) m (YO) n-R '
(Wherein, R and R ′ each independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents a straight-chain alkylene group having 2 to 4 carbon atoms, and Y represents 5 represents a straight-chain alkylene group, X and Y may be the same or different, m and n each independently represent 3 to 60, and m + n represents 6 to 100.)
The weight average molecular weight of the polyether derivative represented by the formula (5-2) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.
As the polyether derivative represented by the formula (5-2), a commercially available product can be used.

The polyether derivative represented by the formula (5) is preferably represented by the following formula (5-3).
The following formula (5-3):
RO- (XO) m (YO) n-R '
(Wherein, R and R ′ each independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents a branched alkylene group having 2 to 4 carbon atoms, and Y represents 2 to 5 carbon atoms. X and Y may be the same or different, and m and n each independently represent 3 to 60, and m + n represents 6 to 120.)
The weight average molecular weight of the polyether derivative represented by the formula (5-3) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.
As the polyether derivative represented by the formula (5-3), a commercially available product can be used.

  The polyether derivative represented by the formula (5) includes a polyether derivative represented by the following formula (6), a polyether derivative represented by the formula (7), a polyether derivative represented by the formula (8), The polyether derivative represented by the formula (9), the polyether derivative represented by the formula (10), the polyether derivative represented by the formula (11), the polyether derivative represented by the formula (12), It is preferable to contain at least one selected from the group containing the polyether derivative represented by 13) and the polyether derivative represented by formula (14).

  The polyether derivative represented by the formula (5-1) includes a polyether derivative represented by the following formula (6), a polyether derivative represented by the formula (7), and a polyether represented by the formula (8) It is preferable to contain at least one selected from the group consisting of a derivative, a polyether derivative represented by the formula (9), and a polyether derivative represented by the formula (10).

  The polyether derivative represented by the formula (5-2) is at least one selected from the group containing a polyether derivative represented by the formula (11) and a polyether derivative represented by the formula (12). It is preferred to contain.

  The polyether derivative represented by the formula (5-3) is at least one selected from the group containing a polyether derivative represented by the formula (13) and a polyether derivative represented by the formula (14). It is preferred to contain.

Equation (6):
_{HO- (CH 2 CH 2 CH 2} CH 2 O) m (CH (CH 3) CH 2 O) n-H
(In the formula, m and n each independently represent 3 to 60, and m + n represents 8 to 90.)

As the polyether derivative represented by the formula (6), a modified glycol composed of a tetramethylene glycol unit and a propylene glycol unit is preferable. As such polyether derivatives, commercially available products can be used. For example, polyserine DCB-1000 (weight average molecular weight 1000), polyserine DCB-2000 (weight average molecular weight 2000), polyserine DCB manufactured by NOF Corporation -4000 (weight average molecular weight 4000), polyserine 60-2000H (weight average molecular weight 2000) and the like can be used.
The weight average molecular weight of the polyether derivative represented by the formula (6) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.

Equation (7):
_{HO- (CH 2 CH 2 CH 2} CH 2 O) m (CH 2 CH 2 CH (CH 3) CH 2 O) n-H
(In the formula, m and n each independently represent 3 to 60, and m + n represents 8 to 90.)

As the polyether derivative represented by the formula (7), a modified glycol composed of a tetramethylene glycol unit and a 2-methyltetramethylene glycol unit is preferable. As such a polyether derivative, a commercially available product can be used. For example, PTG-L1000 (weight average molecular weight 1000), PTG-L2000 (weight average molecular weight 2000), or PTG manufactured by Hodogaya Chemical Industry Co., Ltd. -L3000 (weight average molecular weight 3000) and the like can be used.
The weight average molecular weight of the polyether derivative represented by the formula (7) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.

Equation (8):
_{HO- (CH 2 CH 2 O)} m (CH (CH 3) CH 2 O) n-H
(In the formula, m and n each independently represent 3 to 60, and m + n represents 8 to 90.)

As the polyether derivative represented by the formula (8), a modified glycol composed of an ethylene glycol unit and a propylene glycol unit is preferable. As such a polyether derivative, a commercially available product can be used. For example, Unilube 50DE-25 (weight average molecular weight 1750), Unilube 75DE-25 (weight average molecular weight 1400), etc. manufactured by NOF Corporation are used. it can.
The weight average molecular weight of the polyether derivative represented by the formula (8) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.

Equation (9):
_{RO- (CH 2 CH 2 CH 2} CH 2 O) m (CH (CH 3) CH 2 O) n-H
(In the formula, R represents an alkyl group having 1 to 30 carbon atoms, m and n each independently represent 3 to 60, and m + n represents 8 to 90.)

As the polyether derivative represented by the formula (9), a modified glycol composed of a tetramethylene glycol unit and a propylene glycol unit and having a butyl group at one end or a stearyl group at one end is preferable. As such polyether derivatives, commercially available products can be used. For example, polyserine BC-1000 (one terminal butyl group, weight average molecular weight 1000), polyserine SC-1000 (one terminal stearyl) manufactured by NOF Corporation Group, weight average molecular weight of 1000) and the like.
The weight average molecular weight of the polyether derivative represented by the formula (9) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.

Equation (10):
_{RO- (CH 2 CH 2 O)} m (CH (CH 3) CH 2 O) n-H
(In the formula, R represents an alkyl group having 1 to 30 carbon atoms, m and n each independently represent 3 to 60, and m + n represents 8 to 90.)

As the polyether derivative represented by the formula (10), a modified glycol composed of an ethylene glycol unit and a propylene glycol unit and having a butyl group at one end or a stearyl group at one end is preferable. As such a polyether derivative, a commercially available product can be used, and for example, Unilube 50MB-11 (butyl group at one end, weight average molecular weight 1000), Unilube 50MB-26 (butyl at one terminal) manufactured by NOF Corporation. Group, weight average molecular weight 2000), Unilube 50MB-72 (butyl group at one end, weight average molecular weight 3000), Unilube 10MS-250KB (stearyl group at one end, weight average molecular weight 2000) and the like can be used.
The weight average molecular weight of the polyether derivative represented by the formula (10) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.

Equation (11):
_{HO- (CH 2 CH 2 CH 2} CH 2 O) m (CH 2 CH 2 O) n-H
(In the formula, m and n each independently represent 3 to 60, and m + n represents 8 to 90.)

As the polyether derivative represented by the formula (11), a modified glycol composed of a tetramethylene glycol unit and an ethylene glycol unit is preferable. As such a polyether derivative, a commercially available product can be used. For example, polyserine DC3000E (weight average molecular weight 3000), polyserine DC1800E (weight average molecular weight 1800), etc., manufactured by NOF Corporation can be used.
The weight average molecular weight of the polyether derivative represented by the formula (11) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.

Equation (12):
_{HO- (CH 2 CH 2 CH 2} CH 2 O) p-H
(In the formula, p represents 6 to 100.)

As the polyether derivative represented by the formula (12), polytetramethylene glycol is preferable. As such a polyether derivative, a commercially available product can be used. For example, PTG-650SN (weight average molecular weight 650), PTG-850SN (weight average molecular weight 850), and PTG- manufactured by Hodogaya Chemical Industry Co., Ltd. 1000SN (weight average molecular weight 1000), PTG-1400SN (weight average molecular weight 1400), PTG-2000SN (weight average molecular weight 2000), PTG-2900 (weight average molecular weight 2900) and the like can be used.
The weight average molecular weight of the polyether derivative (polytetramethylene glycol) represented by the formula (12) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.

Equation (13):
_{Formula: HO- (CH (CH 3)} CH 2 O) q-H
(In the formula, q represents 7 to 120.)

As the polyether derivative represented by the formula (13), polypropylene glycol is preferable. As such a polyether derivative, a commercially available product can be used. For example, Dow Chemical's polyglycol P2000P (weight average molecular weight 2000), NOF Corporation, Uniol D-1000 (weight average molecular weight 1000), Uniol D-2000 (weight average molecular weight 2000), Uniol D-4000 (weight average molecular weight 4000) and the like can be used.
The weight average molecular weight of the polyether derivative (polypropylene glycol) represented by the formula (13) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.

Equation (14):
_{HO- (CH (C 2 H 5} ) CH 2 O) r-H
(In the formula, r represents 6 to 100.)

As the polyether derivative represented by the formula (14), polybutylene glycol is preferable. As such polyether derivatives, commercially available products can be used. For example, UNIOL PB-500 (weight average molecular weight 500), UNIOL PB-1000 (weight average molecular weight 1000), UNIOL PB manufactured by NOF Corporation -2000 (weight average molecular weight 2000) and the like can be used.
The weight average molecular weight of the polyether derivative (polybutylene glycol) represented by the formula (14) is preferably from 500 to 8000, and more preferably from 1,000 to 4,000.

  The polyether derivative represented by the general formula (5) generally has high heat resistance, and a molded article obtained by molding an aromatic polycarbonate resin composition containing the polyether derivative at a high temperature has high luminance and light transmittance.

  Further, since the polyether derivative (E) used in the present invention has a moderate lipophilicity and is also excellent in compatibility with the aromatic polycarbonate resin (A), the polyether derivative (B) Improvements in light transmittance and hue can be expected without lowering the transparency of the molded article obtained from the blended aromatic polycarbonate resin composition. The weight average molecular weight of such a polyether derivative (B) is preferably from 500 to 8000, more preferably from 1,000 to 4,000.

  The amount of the polyether derivative (E) is, for example, 0.1 to 2.0 parts by weight, and may be 0.3 to 1.8 parts by weight based on 100 parts by weight of the aromatic polycarbonate resin (A). preferable. When the amount of the polyether derivative is 0.1 to 2.0 parts by weight, the light transmittance and the hue can be appropriately improved.

  The CPR (unit: dimensionless) of the polyether derivative (E) used in the present invention (Controlled Polymerization Rate, an index indicating the amount of a basic substance in the polyether derivative: JIS K-1557 6.8) is 2. It is preferably 0 or less, more preferably CPR is 1.0 or less. The polyether derivative whose CPR is adjusted to be in such a range after the purification treatment with the adsorbent is excellent in compatibility with the polycarbonate resin, is prevented from being decomposed and deteriorated, and is excellent in storage stability. For example, polyserine DCB2000 (less than CPR 1.0), polyserine 60-2000H (less than CPR 1.0), PTG-1000SN (less than CPR 1.0) and the like.

  The pH of the polyether derivative (E) used in the present invention is preferably 5.0 to less than 7.5, and more preferably 6.0 to less than 7.0. Although the pH of a commercially available polyether derivative may change depending on the storage state, etc., generally, a polyether derivative adjusted to 5.0 to less than 7.5 is more excellent in storage stability because decomposition and deterioration are prevented, It does not adversely affect the hue of the obtained polycarbonate resin composition. For example, polyserine DCB2000 (pH 6.7), polyserine 60-2000H (pH 6.8), PTG-1000SN (pH 6.7), and the like.

  In addition to the above components, the aromatic polycarbonate resin composition of the embodiment of the present invention may further contain an epoxy compound (F). When the aromatic polycarbonate resin composition further contains an epoxy compound (F), while maintaining and improving the excellent optical properties required for the optical molded product, the initial stage of the molded product composed of the obtained aromatic polycarbonate resin composition is improved. It is possible to prevent deterioration such as deterioration and aging deterioration due to use conditions without deteriorating optical characteristics.

  The epoxy compound (F) has at least one epoxy group in the molecule, and is not particularly limited as long as the aromatic polycarbonate resin composition targeted by the present invention can be obtained. The epoxy compound (F) is, for example, 3 ′, 4′-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, epoxidized soybean oil, ε-caprolactone-modified 3 ′, 4′-epoxycyclohexylmethyl 3,4- Epoxy cyclohexane carboxylate, epoxy group-containing acrylic / styrene-based polymer, 2,2-bis (4-hydroxycyclohexyl) propane-diglycidyl ether, and the like can be contained. The epoxy compound (F) preferably contains 3 ', 4'-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate.

  The aromatic polycarbonate resin composition of the embodiment of the present invention preferably contains the epoxy compound (F) in an amount of 0.001 to 0.2 parts by mass with respect to 100 parts by mass of the aromatic polycarbonate resin (A). The content is more preferably 0.002 to 0.1 part by mass, particularly preferably 0.005 to 0.05 part by mass.

  When the aromatic polycarbonate resin composition of the embodiment of the present invention contains 0.001 to 0.2 parts by mass of the epoxy compound (F) based on 100 parts by mass of the aromatic polycarbonate resin (A), an optical molded product is obtained. The initial optical properties (integrated transmittance and yellowness) of the resulting molded article of the aromatic polycarbonate resin composition are improved while maintaining and improving the excellent optical properties required for Such deterioration can be prevented.

  Furthermore, the aromatic polycarbonate resin composition according to the embodiment includes, for example, a heat stabilizer, another antioxidant, a coloring agent, a release agent, a softening agent, and an antistatic as long as the effects of the present invention are not impaired. Various additives such as an agent and an impact modifier, a polymer other than the aromatic polycarbonate resin (A), and the like may be appropriately compounded.

  To the aromatic polycarbonate resin composition according to the embodiment, for example, an ultraviolet absorber that is a component that further improves the weather resistance of the obtained aromatic polycarbonate resin composition, obtained by molding the aromatic polycarbonate resin composition It can be appropriately used depending on the use of the molded article to be obtained.

  As the ultraviolet absorber, for example, a benzotriazole-based compound, a triazine-based compound, a benzophenone-based compound, an oxalic acid anilide-based compound, or the like, an ultraviolet absorber usually blended in a polycarbonate resin, alone or in combination of two or more Can be used.

  Examples of the benzotriazole-based compound include, for example, 2- (2-hydroxy-5-t-octylphenyl) benzotriazole and 2- (3-tert-butyl-2-hydroxy-5-methylphenyl). -5-chloro-2H-benzotriazole, 2- (3,5-di-tert-pentyl-2-hydroxyphenyl) -2H-benzotriazole, 2- (2H-benzotriazole-2-yl) -4-methyl-6- ( 3,4,5,6-tetrahydrophthalimidylmethylphenyl, 2- (2-hydroxy-4-octyloxyphenyl) -2H-benzotriazole, 2- (2- hydroxy-5-tert-octylphenyl) -2H-benzotriazole, 2- [2'-hydroxy-3,5-di (1,1-dimethylbenzyl) phenyl] -2H-benzotriazole, 2,2'-methyl [6-methyl- [3-benztriazole] 2H-benzotriazol-2-yl) 4- (1,1,3,3-tetramethylbutyl) phenol] and the like. Among them, 2- (2-hydroxy-5-t-octylphenyl) benzotriazole and the like are particularly preferable. 709 and Chemisorb 79 manufactured by Chemipro Kasei Co., Ltd. are commercially available.

  Examples of the triazine-based compound include 2,4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3,5-triazine and 2- [4,6-bis (2,4-dimethyl Phenyl) -1,3,5-triazin-2-yl] -5- (octyloxy) phenol, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[( [Hexyl) oxy] phenol and the like. For example, TINUVIN 1577 manufactured by BASF is commercially available.

As the oxalic acid anilide-based compound, for example, Sanduvor VSU manufactured by Clariant Japan KK is commercially available.
Examples of the benzophenone-based compound include, for example, 2,4-dihydroxybenzophenone and 2-hydroxy-4-n-octoxybenzophenone.

  The amount of the ultraviolet absorber is 0 to 1.0 part by weight, preferably 0 to 0.5 part by weight, per 100 parts by weight of the aromatic polycarbonate resin (A). When the amount of the ultraviolet absorber exceeds 1.0 part by weight, the initial hue of the obtained aromatic polycarbonate resin composition may be reduced. In addition, when the amount of the ultraviolet absorber is 0.1 part by weight or more, the effect of further improving the weather resistance of the aromatic polycarbonate resin composition is particularly enhanced.

  The aromatic polycarbonate resin composition of the embodiment of the present invention is obtained by mixing an aromatic polycarbonate resin (A), a phosphorus-based antioxidant (B), a fatty acid ester (C), and a specific aromatic compound (D). Accordingly, a production method in which a polyether derivative (E), an epoxy compound (F), the above-mentioned various additives, and a polymer other than the aromatic polycarbonate resin (A) are mixed can be exemplified. The production method is not particularly limited as long as the aromatic polycarbonate resin composition aimed by the present invention can be obtained, and the type and amount of each component can be appropriately adjusted. The method of mixing the components is not particularly limited, and examples thereof include a method of mixing with a known mixer such as a tumbler and a ribbon blender, and a method of melt-kneading with an extruder. By these methods, pellets of the aromatic polycarbonate resin composition can be easily obtained. The specific aromatic compound (D) may be mixed before melt-kneading, or may be added to or mixed with the fatty acid ester (C) or the polyether derivative (E) in advance.

  The shape and size of the pellets of the aromatic polycarbonate resin composition obtained as described above are not particularly limited, and may be any shape and size that general resin pellets have. For example, examples of the shape of the pellet include an elliptical columnar shape and a columnar shape. As the size of the pellet, it is preferable that the length is about 2 to 8 mm, and in the case of an elliptical column, it is preferable that the major axis of the section ellipse is about 2 to 8 mm and the minor axis is about 1 to 4 mm. In the case of a cylindrical shape, the diameter of the cross-sectional circle is preferably about 1 to 6 mm. Note that each of the obtained pellets may have such a size, and all the pellets forming the pellet aggregate may have such a size, and the average value of the pellet aggregate is Such a size may be used, and there is no particular limitation.

  The optical molded product of the embodiment of the present invention can be obtained by molding the above aromatic polycarbonate resin composition.

  The production method of the optical molded article is not particularly limited as long as the optical molded article aimed at by the present invention can be obtained. For example, an aromatic polycarbonate resin composition can be obtained by a known injection molding method, compression molding method, or the like. Molding method.

  The optical molded product according to the present invention is suitable as, for example, a light guide plate, a surface light emitter material, a light guide film, a light guide for a vehicle, a nameplate, and the like.

  As described above, the embodiments have been described as examples of the invention. However, the technology in the present invention is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, and the like are made as appropriate.

  Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples. Unless otherwise specified, “parts” and “%” are based on weight, respectively.

The following were used as raw materials.
1. Aromatic polycarbonate resin (A):
Polycarbonate resin synthesized from bisphenol A and carbonyl chloride Viscosity average molecular weight: 15000, SD Polycar 200-80 (trade name) manufactured by Sumika Polycarbonate Co., Ltd., and “SD Polyca” is a registered trademark of Sumika Polycarbonate Co., Ltd. , Hereinafter also referred to as “PC” or (A1)

2. Phosphorus antioxidant (B):
2-1. Tris (2,4-di-t-butylphenyl) phosphite represented by the following formula
[Irgafos 168 (trade name) manufactured by BASF, also referred to as (B1) below]

2-2. Is expressed by the following equation, bis (2, 6 - di -tert- butyl-4-methylphenyl) pentaerythritol diphosphite (IUPAC name: 3,9-bis (2,6-di -tert- butyl - 4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5,5] undecane)
[ADEKA STAB PEP-36 (trade name) manufactured by ADEKA, hereinafter also referred to as (B2)]

3. Fatty acid ester (C):
Glycerin monostearate Liquemar S-100A
(Trade name, manufactured by Riken Vitamin Co., Ltd., hereinafter referred to as "GM" or (C1))

4. Aromatic compound (D):
3,5-di-t-butyl-4-hydroxytoluene [manufactured by Wako Pure Chemical Industries, Ltd .; hereinafter, also referred to as (D1)]
5. Polyether derivative (E):
5-1. Modified glycol consisting of tetramethylene glycol unit and propylene glycol unit (random copolymerization)
Weight average molecular weight: 2000, polyserine DCB-2000 (trade name) manufactured by NOF Corporation, also referred to as (E1).

5-2. Modified glycol consisting of ethylene glycol unit and propylene glycol unit (random copolymerization)
Weight average molecular weight: 1750, Unilube 50DE-25 (trade name) manufactured by NOF Corporation, hereinafter referred to as (E2).

5-3. 5. Polytetramethylene glycol weight average molecular weight: 1000, PTG-1000SN (trade name) manufactured by Hodogaya Chemical Industry Co., Ltd. Epoxy compound (F)
3 ′, 4′-Epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate [Celloxide 2021P (trade name) manufactured by Daicel Chemical Industries, Ltd .; hereinafter, also referred to as (F1)]

(Examples 1 to 11 and Comparative Examples 1 to 5)
Each of the raw materials was put into a tumbler at a rate shown in Tables 1 and 2 and dry-mixed for 10 minutes, and then melted using a twin-screw extruder (manufactured by Nippon Steel Works, TEX30α). The mixture was melt-kneaded at a temperature of 220 ° C. to obtain pellets of the aromatic polycarbonate resin compositions of Examples 1 to 11 and Comparative Examples 1 to 5.
Each of the pellets obtained in the examples and the comparative examples has a substantially elliptical columnar shape, and an aggregate of 100 pellets has an average length of about 5.1 mm to about 5.4 mm, and has an elliptical cross section. The average value of the major axis was about 4.1 mm to about 4.3 mm, and the average value of the minor axis was about 2.2 mm to about 2.3 mm.

  Using the obtained pellets, test pieces for evaluation were prepared according to the following method and subjected to evaluation. The results are shown in Tables 1 and 2.

(Method of preparing test pieces)
After the obtained pellets were dried at 120 ° C. for 4 hours or more, using an injection molding machine (ROBOSHOT S2000i100A, manufactured by FANUC Co., Ltd.) at a molding temperature of 280 ° C. and a mold temperature of 80 ° C., JIS K 7139 “Plastic- A specified multipurpose test piece A type (length: 168 mm × thickness: 4 mm) was prepared from the “test piece”. The end face of this test piece was cut, and the cut end face was mirror-finished using a resin plate end face mirror machine (Plasticity PB-500, manufactured by Megalo Technica Co., Ltd.).

(Evaluation method of integrated transmittance)
A long optical path measurement accessory device was installed on a spectrophotometer (UH4150, manufactured by Hitachi, Ltd.), and a 50 W halogen lamp was used as a light source. A mask in front of the light source was 5.6 mm × 2.8 mm, and a mask in front of the sample was 6.0 mm × With 2.8 mm used, the spectral transmittance of each test piece was measured for each 1 nm in the wavelength range of 380 to 780 nm in the full length direction of the test piece. The measured spectral transmittances were integrated, and the tens place was rounded off to obtain each integrated transmittance. It should be noted that the integrated transmittance was 32,000 or more as good (indicated by ◎ in the table), less than 32,000 and 30,000 or more were usable (indicated by ○ in the table), and less than 30,000 was poor (indicated by x in the table).

(Evaluation method of yellowness)
Based on the spectral transmittance measured in the evaluation method of the integrated transmittance, each yellowness (hereinafter, YI) was determined in a 10-degree visual field using a standard light source D65. In addition, YI was 12 or less as good (indicated by ◎ in the table), exceeded 12, and 13 or less was usable (indicated by 、 in the table), and when it exceeded 13, it was determined to be poor (indicated by x in the table). .

(Evaluation of heating test of molded product)
The test piece prepared as described above was placed in an inert oven IPHH-201M manufactured by Espec Corporation and subjected to a heating test at 200 ° C. for 72 hours.
Next, the surface of each test piece was visually observed. The state after the heating test was evaluated according to the following criteria. The results are shown in Tables 1 to 3.
A: Colorless and transparent.
：: Transparent and usable, but slightly colored.
X: There is opacity or deep coloring.

  Tables 1 and 2 also show the raw materials, the mixing ratios, and the evaluation results of the respective examples and comparative examples.

  The aromatic polycarbonate resin compositions of Examples 1 to 11 each contained an aromatic polycarbonate resin (A), a phosphorus-based antioxidant (B), a fatty acid ester (C), and a specific aromatic compound (D). Thus, the polyether derivative (E) and the epoxy compound (F) are respectively contained at specific ratios. Therefore, the test piece molded from the aromatic polycarbonate resin composition has a high integrated transmittance, a small yellowness, and hardly deteriorates after the heating test.

  A molded article obtained by molding such an aromatic polycarbonate resin composition has a small yellowness and excellent hue, and hardly deteriorates after a heating test.

  On the other hand, the molded articles obtained by molding the aromatic polycarbonate resin compositions of Comparative Examples 1 to 5 were inferior in at least one of the luminance, the hue, and the result after the heating test.

  As described above, the embodiments have been described as examples of the technology according to the present invention. A detailed description has been provided for that.

  Therefore, among the components described in the detailed description, not only components that are essential for solving the problem but also components that are not essential for solving the problem are included to illustrate the above technology. obtain. Therefore, the fact that those non-essential components are described in the detailed description should not be immediately concluded that the non-essential components are essential.

  Further, since the above-described embodiment is for exemplifying the technique of the present invention, various changes, replacements, additions, omissions, and the like can be made within the scope of the claims or the equivalents thereof.

  The aromatic polycarbonate resin composition of the present invention has excellent heat stability and weather resistance without impairing the properties inherent to the polycarbonate resin, such as heat resistance, mechanical strength, and the aromatic polycarbonate resin of the present invention. Even when a molded article containing the composition is heated, it has excellent appearance and optical properties. Therefore, even when used for an application in which the heating state is continued by long-term irradiation of the light guide plate surface of a thin light guide light source having a thickness of about 0.3 mm, the hue of the obtained light guide plate is changed and the external appearance is changed. The industrial use value is extremely high without deteriorating the optical characteristics.

Claims (15)

An aromatic polycarbonate resin composition containing an aromatic polycarbonate resin (A), a phosphorus-based antioxidant (B), a fatty acid ester (C), and an aromatic compound (D) represented by the following formula, 0.01 to 0.1 part by weight of a phosphorus-based antioxidant (B), 0.01 to 0.5 part by weight of a fatty acid ester (C), and aromatic based on 100 parts by weight of the polycarbonate resin (A) An aromatic polycarbonate resin composition comprising the compound (D) in an amount of 0.0001 to 0.003 parts by weight .
formula:
The aromatic polycarbonate resin composition according to claim 1, wherein the phosphorus-based antioxidant (B) contains a phosphite compound having the following phosphite structure.
The fragrance according to claim 1, wherein the phosphorus antioxidant (B) contains at least one compound selected from phosphite compounds represented by the following formulas (1) and (2). Aromatic polycarbonate resin composition.
Equation (1):
[In the formula, R ¹ represents an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group, and a represents an integer of 0 to 3. ]
Equation (2):
[Wherein, R ⁹ and R ¹⁰ represent an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group, and b and c each represent an integer of 0 to 3. ] The aromatic polycarbonate resin composition according to claim 3, which satisfies at least one selected from the following.
The phosphite compound represented by the formula (1) contains tris (2,4-di-t-butylphenyl) phosphite; and the phosphite ester represented by the formula (2) The compound contains 3,9-bis (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5,5] undecane .   The phosphorus-based antioxidant (B) contains at least a compound represented by the general formula (1), and the amount of the compound represented by the general formula (1) is determined based on the total amount of the phosphorus-based antioxidant (B). The aromatic polycarbonate resin composition according to claim 3 or 4, which is 20 to 100% by mass.   The phosphorus-based antioxidant (B) contains at least two kinds of compounds, and one of the at least two kinds of compounds is a compound represented by the general formula (1); The aromatic polycarbonate resin composition according to claim 3 or 4, wherein the amount of the compound represented by the formula) is 20 to 90% by mass of the total amount of the phosphorus-based antioxidant (B).   The aromatic polycarbonate resin composition according to any one of claims 1 to 6, wherein the fatty acid ester (C) contains a condensation compound of an aliphatic carboxylic acid and an alcohol. The fatty acid ester (C) is an ester of an aliphatic monocarboxylic acid or aliphatic dicarboxylic acid having 6 to 36 carbon atoms and an aliphatic saturated monohydric alcohol or aliphatic saturated polyhydric alcohol having 30 or less carbon atoms. The aromatic polycarbonate resin composition according to claim 7, comprising:   The aromatic polycarbonate resin composition according to claim 8, wherein the fatty acid ester (C) is glycerin monostearate.   The fragrance according to any one of claims 1 to 9, further comprising 0.001 to 0.2 parts by mass of an epoxy compound (F) based on 100 parts by mass of the aromatic polycarbonate resin (A). Aromatic polycarbonate resin composition.   The aromatic polycarbonate resin composition according to claim 10, wherein the epoxy compound (F) contains 3 ', 4'-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate.   The method according to claim 1, further comprising at least one selected from the group comprising a heat stabilizer, an antioxidant, a colorant, a release agent, a softener, an antistatic agent and an impact modifier. Item 2. The aromatic polycarbonate resin composition according to item 1.   An optical molded product containing the aromatic polycarbonate resin composition according to claim 1.   14. The optical molded product according to claim 13, wherein the optical molded product includes a molded product selected from a light guide film, a vehicle light guide, and a nameplate.   A method for producing an optical molded product, comprising molding the aromatic polycarbonate resin composition according to claim 1.