JP7239512B2 - Aromatic polycarbonate resin composition and molded article for optical use - Google Patents

Description

TECHNICAL FIELD The present invention relates to an aromatic polycarbonate resin composition and an optical molded article.

BACKGROUND ART Polycarbonate resins are excellent in impact resistance, heat resistance, transparency, etc., and are conventionally used for molded articles such as light guide plates, various lenses and nameplates.

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

Patent Literature 2 discloses a polycarbonate resin composition for optical moldings, in which a resin component obtained by blending a specific amount of a bead-shaped crosslinked acrylic resin having a specific diameter with a polycarbonate resin is blended with a fluorescent brightener.

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

JP 2007-204737 A Japanese Patent Application Laid-Open No. 09-020860 JP 2011-133647 A JP-A-11-158364

However, the polycarbonate resin compositions disclosed in Patent Documents 3 and 4 meet the recent demands as materials for light guide plates (in particular, there is no decrease in light transmittance even when molding is performed at high temperatures for thin-wall molding, etc.). requirements) can not be fully satisfied. Furthermore, in recent years, even when a molded product with a thickness of about 0.3 mm (e.g., light guide plate) that has been molded and processed is exposed to high temperature conditions such as light irradiation for an extremely long period of time, there is little decrease in transparency ( There is a growing demand for materials that are less cloudy or less colored.

The present invention does not impair the properties such as heat resistance and mechanical strength inherent in polycarbonate resin, has excellent thermal stability, has high light transmittance, and is molded to a thin shape of about 0.3 mm. Disclosed is an aromatic polycarbonate resin composition that hardly causes deterioration in transparency (hardly causes white turbidity and coloration) even when a product (for example, a light guide plate) is exposed to high temperature due to light irradiation or the like for an extremely long period of time. aim.

The present inventors have made intensive studies to solve such problems, and found that an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and a specific aromatic compound (D ) An aromatic polycarbonate resin composition containing
An aromatic polycarbonate resin composition containing 0.01 to 0.1 parts by weight of a phosphorus antioxidant (B) and a predetermined amount of the fatty acid ester (C) with respect to 100 parts by weight of the aromatic polycarbonate resin (A). However, without impairing the inherent heat resistance and mechanical strength properties of polycarbonate resin, it has excellent thermal stability, high light transmittance, and a thin molded product of about 0.3 mm (light guide plate ) is less likely to deteriorate in transparency (difficult to cause white turbidity or coloration) even when exposed to high temperature conditions such as light source irradiation for a long period of time, and completed the present invention.

That is, the present invention provides an aromatic polycarbonate resin composition containing an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and an aromatic compound (D) represented by the following formula. and
Per 100 parts by weight of the aromatic polycarbonate resin (A), 0.01 to 0.1 parts by weight of the phosphorus antioxidant (B), 0.01 to 0.5 parts by weight of the fatty acid ester (C), and 0.0001 parts by weight or more and less than 0.05 parts by weight of an aromatic compound (D).
formula:

The polycarbonate resin composition of the present invention does not impair the inherent properties of the polycarbonate resin such as heat resistance and mechanical strength, and has excellent thermal stability and high light transmittance. Even when exposed to high temperature conditions due to the environment and/or light source irradiation for a long period of time, the transparency is unlikely to decrease (white turbidity or coloration is unlikely to occur). Therefore, even for a thin molded product (light guide plate) with a thickness of about 0.3 mm, it is difficult for the hue to change and the appearance to deteriorate (deteriorate), and under high temperature conditions caused by the external environment or light source. Even when exposed to water for a long period of time, it hardly causes a decrease in transparency (hardly causes cloudiness or coloration), and has extremely high industrial utility value.

Embodiments will be described in detail below. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art.

It should be noted that the inventors provide the following explanations for a full understanding of the invention by those skilled in the art and are not intended to limit the claimed subject matter by them.

The aromatic polycarbonate resin composition of the embodiment of the present invention contains an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and a specific aromatic compound (D), and Depending on the requirements, polyether derivatives (E), epoxy compounds (F) and/or other components may be included.

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 the aromatic polycarbonate resin composition aimed at by the present invention can be obtained. never Examples of such aromatic polycarbonate resins include polymers obtained by the phosgene method in which various dihydroxydiaryl compounds are reacted with phosgene, or by the transesterification method in which a dihydroxydiaryl compound is reacted with a carbonate such as diphenyl carbonate. can. Representative examples include polycarbonate resins 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 , 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(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclohexane and the like bis(hydroxyaryl)cycloalkanes; dihydroxydiaryl ethers such as 4,4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether; dihydroxydiaryls such as 4,4'-dihydroxydiphenylsulfide sulfides; dihydroxydiarylsulfoxides such as 4,4'-dihydroxydiphenylsulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfoxide; 4,4'-dihydroxydiphenylsulfone, 4,4'-dihydroxy- Examples include dihydroxydiarylsulfones such as 3,3'-dimethyldiphenylsulfone. These can be used alone or in combination. In addition to these, piperazine, dipiperidylhydroquinone, resorcinol, 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 aromatic compound shown below.

Examples of the trihydric 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 and the like can be exemplified.

The viscosity average molecular weight of the aromatic polycarbonate resin (A) is preferably 10,000 to 100,000, more preferably 12,000 to 30,000. Incidentally, when producing such an aromatic polycarbonate resin (A), a molecular weight modifier, a catalyst, etc. can be used as necessary.

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

In the aromatic polycarbonate resin composition of the embodiment of the present invention, the phosphorus antioxidant (B) is a phosphite ester compound represented by the following formula (1), a phosphorus compound represented by the following formula (2) It is preferable to contain at least one compound selected from an acid ester compound, a phosphite ester compound represented by the following formula (3), and a phosphite ester compound represented by the following formula (4). The phosphorus-based antioxidant (B) acts together with the fatty acid ester (C) and the later-described specific aromatic compound (D) to impair the inherent properties of the resulting polycarbonate resin composition, such as heat resistance and mechanical strength. It has excellent thermal stability and high light transmittance, and even if a thin molded product (light guide plate) with a thickness of about 0.3 mm is exposed to high temperature conditions such as light source irradiation for a long period of time, It is a component that reduces the decrease in transparency (hard to cause white turbidity or coloration).

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

（式中、Ｒ^１は、炭素数１～２０のアルキル基を示し、ａは、０～３の整数を示す） Formula (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 above 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 formula (1) include triphenylphosphite, tricresylphosphite, tris(2,4-di-t-butylphenyl)phosphite, trisnonylphenylphosphite and the like. . Among these, tris(2,4-di-t-butylphenyl) phosphite is particularly suitable, and for example, commercially available as Irgafos 168 ("Irgafos" is a registered trademark of BASF Societas Europe) manufactured by BASF. available at

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

（式中、Ｒ^９及びＲ^１０は、それぞれ独立して、炭素数１～２０のアルキル基又はアルキル基で置換されていてもよいアリール基を示し、ｂ及びｃは、それぞれ独立して、０～３の整数を示す。） Formula (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; b and c each independently represent 0 Indicates an integer of ~3.)

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

（式中、Ｒ^２、Ｒ^３、Ｒ^５及びＲ^６は、それぞれ独立して、水素原子、炭素数１～８のアルキル基、炭素数５～８のシクロアルキル基、炭素数６～１２のアルキルシクロアルキル基、炭素数７～１２のアラルキル基又はフェニル基を示す。Ｒ^４は、水素原子又は炭素数１～８のアルキル基を示す。Ｘは、単結合、硫黄原子又は式：－ＣＨＲ^７－（ここで、Ｒ^７は、水素原子、炭素数１～８のアルキル基又は炭素数５～８のシクロアルキル基を示す）で表される基を示す。Ａは、炭素数１～８のアルキレン基又は式：＊－ＣＯＲ^８－（ここで、Ｒ^８は、単結合又は炭素数１～８のアルキレン基を示し、＊は、酸素側の結合手であることを示す）で表される基を示す。Ｙ及びＺは、いずれか一方がヒドロキシル基、炭素数１～８のアルコキシ基又は炭素数７～１２のアラルキルオキシ基を示し、もう一方が水素原子又は炭素数１～８のアルキル基を示す。） Formula (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, a 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 the formula: -CHR ^7- (here, 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), A represents a group represented by 1 to 8 carbon atoms; or the formula: *-COR ⁸ — (here, R ⁸ represents a single bond or an alkylene group having 1 to 8 carbon atoms, and * represents a bond on the oxygen side) 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 a indicates an alkyl group.)

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

Examples of the alkyl group having 1 to 8 carbon atoms include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group and 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 cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group and the like. Examples of alkylcycloalkyl groups having 6 to 12 carbon atoms include 1-methylcyclopentyl group, 1-methylcyclohexyl group, 1-methyl-4-i-propylcyclohexyl group and the like. Examples of the aralkyl group having 7 to 12 carbon atoms include benzyl group, α-methylbenzyl group, α,α-dimethylbenzyl group and the like.

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 each independently preferably a t-alkyl group such as t-butyl group, t-pentyl group, t-octyl group, cyclohexyl group or 1-methylcyclohexyl group. In particular, R ³ has a carbon number such as a methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, t-pentyl group, etc. An alkyl group of 1 to 5 is preferred, and a methyl group, t-butyl group or t-pentyl group is more preferred.

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 a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group. , n-butyl, i-butyl, sec-butyl, t-butyl, t-pentyl and other alkyl groups having 1 to 5 carbon atoms are more preferred.

In formula (3), R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. The alkyl group having 1 to 8 carbon atoms includes, for example, the alkyl groups exemplified above for R ² , R ³ , R ⁵ and R ⁶ . In particular, R ⁴ is preferably a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, more preferably a hydrogen atom or a methyl group.

In 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 explanation of R ² , R ³ , R ⁵ and R ⁶ above, respectively. be done. In particular, X is a single bond, a methylene group, or a methylene group substituted with a methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group, or the like. is preferred, and a single bond is more preferred.

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 group, ethylene group, propylene group, butylene group, pentamethylene group, hexamethylene group, octamethylene group, 2,2-dimethyl-1,3-propylene group 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 representing R ⁸ include the alkylene groups exemplified in the explanation of A above. R ⁸ is preferably a single bond or an ethylene group. In addition, * 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 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 of The alkoxy group having 1 to 8 carbon atoms includes, for example, methoxy group, ethoxy group, propoxy group, t-butoxy group, pentyloxy group and the like. The aralkyloxy group having 7 to 12 carbon atoms includes, for example, benzyloxy group, α-methylbenzyloxy group, α,α-dimethylbenzyloxy group and the like. The alkyl group having 1 to 8 carbon atoms includes, for example, the alkyl groups exemplified above for R ² , R ³ , R ⁵ and R ⁶ .

Examples of the compound represented by formula (3) include 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]dioxaphosphosine, 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]dioxaphosphosine and the like . Among these, when the obtained aromatic polycarbonate resin composition is used in fields where optical properties are particularly 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, Sumitomo Chemical Co., Ltd. Sumilizer GP (" Sumilizer" is commercially available as a registered trademark).

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

Formula (4):

(wherein R ¹¹ to R ¹⁸ each independently represent an alkyl or 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 may combine with each other to form a ring, R ¹⁹ to R ²² each independently represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, d to g each independently is an integer of 0 to 5. X ¹ to X ⁴ each independently represent a single bond or a carbon atom, and when X ¹ to X ⁴ are single bonds, among R ¹¹ to R ²² , The functional group connected to the single bond is excluded from general formula (4))

Specific examples of the compound represented by formula (4) include bis(2,4-dicumylphenyl)pentaerythritol diphosphite. This is manufactured by Dover Chemical, trade name "Doverphos (registered trademark) S-9228", manufactured by ADEKA, trade name "ADEKASTAB PEP-45" (bis(2,4-dicumylphenyl) pentaerythritol diphosphite). are commercially available as

It is preferable that the phosphorus-based 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 40 to 100% by mass of the total amount of the phosphorus antioxidant (B). is more preferable.

The phosphorus antioxidant (B) preferably contains at least one compound selected from the phosphite ester compounds represented by the general formulas (1) and (2).

It is preferable to satisfy at least one selected from the following.
The phosphite ester 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 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, of the total amount of the phosphorus antioxidant (B). , 40 to 70% by weight is particularly preferred.

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

The fatty acid ester (C) acts together with the phosphorus antioxidant (B) and the later-described specific aromatic compound (D) to impair the inherent properties of the resulting polycarbonate resin composition, such as heat resistance and mechanical strength. It has excellent thermal stability, high light transmittance, and is transparent even when a thin molded product (light guide plate) with a thickness of about 0.3 mm is exposed to high temperature conditions such as light source irradiation for a long period of time. It is a component that reduces the decrease in properties (hard to cause white turbidity or coloration).

For example, it effectively prevents thermal degradation (white turbidity or coloration) caused by long-term light irradiation of an optical molded article molded from an aromatic polycarbonate resin composition. Under severe conditions such as under the scorching sun and/or when exposed to light irradiation for a long period of time, the surface temperature of optical molded articles may rise. Thermal deterioration of the resin (A) may progress little by little. Furthermore, the fatty acid ester (C) in the resin composition may gradually denature, impairing the transparency (brightness or light transmittance) expected of aromatic polycarbonate resin compositions used in ordinary optical molded articles, resulting in poor molding. In some cases, the surface of the product may become cloudy or colored (pale to dark).

In view of this problem, the inventors of the present application conducted intensive studies and found that the specific aromatic compound (D) of the following formula is particularly effective as a compound that suppresses deterioration such as denaturation of the fatty acid ester (C) and coloration resulting therefrom. By adding the specific aromatic compound (D) before melt-kneading for obtaining the aromatic polycarbonate resin composition, deterioration of the fatty acid ester (C) in the molded article is suppressed and cloudiness or coloration is suppressed. The present invention was completed based on the idea that the (light to deep coloring) phenomenon can be reduced or alleviated.
formula:

As the fatty acid ester (C), a condensate compound of a normal aliphatic carboxylic acid and alcohol can be used.

Examples of the aliphatic carboxylic acid include saturated or unsaturated monocarboxylic acid, dicarboxylic acid, tricarboxylic acid and the like. Alicyclic carboxylic acids are also included in the aliphatic carboxylic acids. Among these, monocarboxylic acids and dicarboxylic acids having 6 to 36 carbon atoms are preferred, and saturated monocarboxylic acids having 6 to 36 carbon atoms are more preferred. 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 acids include palmitic acid, stearic acid, valeric acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, melissic acid, and tetratriacontanoic acid. , montanic acid, glutaric acid, adipic acid, and azelaic acid.

The alcohols include saturated or unsaturated monohydric alcohols and polyhydric alcohols, and these alcohols may have substituents such as fluorine atoms, chlorine atoms, bromine atoms, and aryl groups. Among these, saturated alcohols having 30 or less carbon atoms are preferable, and saturated aliphatic monohydric alcohols and saturated aliphatic polyhydric alcohols having 30 or less carbon atoms are more preferable. Aliphatic alcohols also include alicyclic alcohols. The carbon number of the alcohol is preferably 26 or less, more preferably 22 or less.

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

Fatty acid esters (C) include esters of aliphatic monocarboxylic acids and aliphatic dicarboxylic acids having 6 to 36 carbon atoms and saturated aliphatic monohydric alcohols and saturated aliphatic polyhydric alcohols 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 an aliphatic monocarboxylic acid having 10 to 28 carbon atoms More preferably, it contains an ester of an acid with an aliphatic saturated polyhydric alcohol having 22 or less carbon atoms.

Specific examples of the fatty acid ester (C) include behenyl behenate, octyldodecyl behenate, stearyl stearate, glycerin monopalmitate, glycerin monostearate, glycerin monooleate, glycerin distearate, and glycerin tristearate. pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, pentaerythritol tetrastearate, etc., and these can be used alone or in combination of two or more. can. Among these, stearic acid esters such as glycerin monostearate and pentaerythritol distearate are suitable. H476DP ("Unistar" is a registered trademark) is commercially available.

The amount of the fatty acid ester (C) is 0.01 to 0.5 parts by weight, preferably 0.03 to 0.5 parts by weight, based on 100 parts by weight of the polycarbonate resin (A). 05 to 0.2 parts by weight is more preferable. When the amount of the fatty acid ester (C) is less than 0.01 parts by weight, the effect of suppressing yellowing and improving the hue is insufficient. Conversely, when the amount of the fatty acid ester (C) exceeds 0.5 parts by weight, the effect of improving the hue becomes insufficient.

The aromatic polycarbonate resin composition of the embodiment of the present invention comprises an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and an aromatic compound (D) represented by the following formula. and optionally containing a polyether derivative (E), an epoxy compound (F) and/or other additives, the aromatic polycarbonate resin composition obtained thereby Excellent thermal stability, high light transmittance, and a thin molded product (light guide plate) of about 0.3 mm that is molded and processed without impairing the inherent heat resistance, mechanical strength, etc. properties of the light source. Even when exposed to high temperature conditions such as those for a long period of time, there is little decrease in transparency (hard to cause white turbidity or coloration).
formula:

For example, it effectively prevents thermal degradation (white turbidity or coloration) caused by long-term light irradiation of an optical molded article molded from an aromatic polycarbonate resin composition. Under severe conditions such as under the hot sun and/or when exposed to light for a long time, the temperature of the surface of the optical molded product may rise. Thermal deterioration of the aromatic polycarbonate resin (A) contained in the aromatic polycarbonate resin composition may progress little by little as the derivative (E) is denatured under the influence of heat.

In view of this problem, the inventors of the present application have made intensive studies and found that the specific aromatic compound of the above formula is a compound that suppresses deterioration such as modification of the fatty acid ester (C) and, if necessary, the polyether derivative (E). (D) is particularly effective, and by adding the specific aromatic compound (D) in advance or adding it before melt-kneading for obtaining the aromatic polycarbonate resin composition, the fatty acid ester in the molded article The present invention was completed based on the idea that the deterioration of (C) and optionally the polyether derivative (E) can be suppressed to reduce or alleviate the phenomenon of white turbidity or coloring (pale to deep coloring).

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 parts by weight with respect to 100 parts by weight of the aromatic polycarbonate resin (A), and 0.0005 A weight part or more and 0.003 weight part or less is preferable. When the amount of the aromatic compound (D) is less than 0.0001 parts by weight, the effect of suppressing cloudiness or coloration is insufficient. Conversely, if the amount of the aromatic compound (C) is 0.05 parts by weight or more, the high level of light transmittance and hue required for optical moldings may not be achieved, which is undesirable.

Embodiments of the present invention may further contain a polyether derivative (E) as required, as described above. The polyether derivative is a derivative of a polyether compound, and is not particularly limited as long as the aromatic polycarbonate resin composition aimed at by the present invention can be obtained. Such polyether derivatives include polyether derivatives represented by the following formula (5) as representative examples.

Formula (5):
RO-(X-O)m(Y-O)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 or branched alkylene group having 2 to 4 carbon atoms, Y is represents a linear or branched alkylene group having 2 to 5 carbon atoms, X and Y may be the same or different, m and n each independently represents 3 to 60, and m+n is 6 to 120 are shown.)
The weight average molecular weight of the polyether derivative represented by formula (5) is preferably 500-8000, more preferably 1000-4000.
A commercial item can be used for the polyether derivative represented by Formula (5).

The polyether derivative represented by formula (5) is preferably represented by formula (5-1) below.
The following formula (5-1):
RO-(X-O)m(Y-O)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 having 2 to 4 carbon atoms, Y represents 2 to 4 carbon atoms, represents a branched alkylene group of 5, m and n each independently represents 3 to 60, and m+n represents 8 to 90.)
The weight average molecular weight of the polyether derivative represented by formula (5-1) is preferably 500-8000, more preferably 1000-4000.
A commercially available product can be used as the polyether derivative represented by the formula (5-1).

The polyether derivative represented by formula (5) is preferably represented by formula (5-2) below.
The following formula (5-2):
RO-(X-O)m(Y-O)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 having 2 to 4 carbon atoms, Y represents 2 to 4 carbon atoms, 5, 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 formula (5-2) is preferably 500-8000, more preferably 1000-4000.
A commercially available product can be used as the polyether derivative represented by the formula (5-2).

The polyether derivative represented by formula (5) is preferably represented by formula (5-3) below.
The following formula (5-3):
RO-(X-O)m(Y-O)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, Y represents a is a branched 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 120.)
The weight average molecular weight of the polyether derivative represented by formula (5-3) is preferably 500-8000, more preferably 1000-4000.
A commercially available product can be used as the polyether derivative represented by the formula (5-3).

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), the formula ( 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) is 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 preferably contains at least one selected from the group containing the derivative, the polyether derivative represented by formula (9), and the polyether derivative represented by formula (10).

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

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

Formula (6):
HO-( _{CH2CH2CH2CH2O} ) _{m (} CH( _CH3 ) _CH2O ) _nH
(Wherein, m and n each independently represent 3 to 60, and m+n represents 8 to 90.)

A modified glycol composed of a tetramethylene glycol unit and a propylene glycol unit is suitable as the polyether derivative represented by formula (6). Commercially available products can be used as such polyether derivatives, for example, manufactured by NOF Corporation, Polyserine DCB-1000 (weight average molecular weight: 1000), Polyserine DCB-2000 (weight average molecular weight: 2000), Polyserine DCB -4000 (weight average molecular weight 4000), polycerine 60-2000H (weight average molecular weight 2000) and the like can be used.
The weight average molecular weight of the polyether derivative represented by formula (6) is preferably 500-8000, more preferably 1000-4000.

Formula (7):
HO- _{( CH2CH2CH2CH2O} ) _{m ( CH2CH2CH} ( _CH3 ) _CH2O ) _nH
(Wherein, m and n each independently represent 3 to 60, and m+n represents 8 to 90.)

A modified glycol composed of a tetramethylene glycol unit and a 2-methyltetramethylene glycol unit is preferred as the polyether derivative represented by formula (7). Commercially available products can be used as such polyether derivatives, for example, PTG-L1000 (weight average molecular weight: 1000), PTG-L2000 (weight average molecular weight: 2000) manufactured by Hodogaya Chemical Co., Ltd., or PTG -L3000 (weight average molecular weight 3000) or the like can be used.
The weight average molecular weight of the polyether derivative represented by formula (7) is preferably 500-8000, more preferably 1000-4000.

Formula (8):
HO—(CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)n—H
(Wherein, m and n each independently represent 3 to 60, and m+n represents 8 to 90.)

A modified glycol composed of an ethylene glycol unit and a propylene glycol unit is preferable as the polyether derivative represented by formula (8). Commercially available products can be used as such polyether derivatives, for example, Unilube 50DE-25 (weight average molecular weight 1750), Unilube 75DE-25 (weight average molecular weight 1400) manufactured by NOF Corporation, etc. can.
The weight average molecular weight of the polyether derivative represented by formula (8) is preferably 500-8000, more preferably 1000-4000.

Formula (9):
RO-( _{CH2CH2CH2CH2O} ) _{m (} CH( _CH3 ) _CH2O ) _nH
(Wherein, R represents an alkyl group having 1 to 30 carbon atoms, m and n each independently represents 3 to 60, and m+n represents 8 to 90.)

A modified glycol composed of a tetramethylene glycol unit and a propylene glycol unit and having one terminal butyl group or one terminal stearyl group is suitable as the polyether derivative represented by the formula (9). Commercially available products can be used as such polyether derivatives, for example, manufactured by NOF Corporation, polycerin BC-1000 (one end butyl group, weight average molecular weight 1000), polycerin SC-1000 (one end stearyl group, weight average molecular weight 1000) and the like can be used.
The weight average molecular weight of the polyether derivative represented by formula (9) is preferably 500-8000, more preferably 1000-4000.

Formula (10):
RO—(CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)n—H
(Wherein, R represents an alkyl group having 1 to 30 carbon atoms, m and n each independently represents 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 one terminal butyl group or one terminal stearyl group is suitable. Commercially available products can be used as such polyether derivatives, for example, manufactured by NOF Corporation, Unilube 50MB-11 (one end butyl group, weight average molecular weight 1000), Unilube 50MB-26 (one end butyl group, weight average molecular weight 2000), Unilube 50MB-72 (one end butyl group, weight average molecular weight 3000), Unilube 10MS-250KB (one end stearyl group, weight average molecular weight 2000), etc. can be used.
The weight average molecular weight of the polyether derivative represented by formula (10) is preferably 500-8000, more preferably 1000-4000.

Formula (11):
_HO- ( _{CH2CH2CH2CH2O} ) _{m ( CH2CH2O} ) _nH
(Wherein, m and n each independently represent 3 to 60, and m+n represents 8 to 90.)

A modified glycol composed of a tetramethylene glycol unit and an ethylene glycol unit is preferable as the polyether derivative represented by formula (11). As such a polyether derivative, a commercially available product can be used, for example, polycerine DC3000E (weight average molecular weight: 3000), polycerine DC1800E (weight average molecular weight: 1800) manufactured by NOF Corporation can be used.
The weight average molecular weight of the polyether derivative represented by formula (11) is preferably 500-8000, more preferably 1000-4000.

Formula (12):
HO—(CH ₂ CH ₂ CH ₂ CH ₂ O) pH
(In the formula, p represents 6 to 100.)

Polytetramethylene glycol is preferred as the polyether derivative represented by formula (12). Commercially available products can be used as such polyether derivatives. 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) or the like can be used.
The weight average molecular weight of the polyether derivative (polytetramethylene glycol) represented by formula (12) is preferably 500-8000, more preferably 1000-4000.

Formula (13):
Formula: HO-(CH( _CH3 ) _CH2O )qH
(In the formula, q represents 7 to 120.)

Polypropylene glycol is preferred as the polyether derivative represented by formula (13). Commercially available products can be used as such polyether derivatives, for example, Dow Chemical 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), etc. can be used.
The weight average molecular weight of the polyether derivative (polypropylene glycol) represented by formula (13) is preferably 500-8000, more preferably 1000-4000.

Formula (14):
HO- ₍ CH( _C2H5 ) _CH2O )r-H
(Wherein, r represents 6 to 100.)

Polybutylene glycol is preferred as the polyether derivative represented by formula (14). Commercially available products can be used as such polyether derivatives. -2000 (weight average molecular weight 2000) or the like can be used.
The weight average molecular weight of the polyether derivative (polybutylene glycol) represented by formula (14) is preferably 500-8000, more preferably 1000-4000.

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

In addition, since the polyether derivative (E) used in the present invention has moderate lipophilicity, it is also excellent in compatibility with the aromatic polycarbonate resin (A), so the polyether derivative (B) is used. Improvements in light transmittance and hue can be expected without reducing the transparency of molded articles obtained from the blended aromatic polycarbonate resin composition. The weight average molecular weight of such a polyether derivative (B) is preferably 500-8000, more preferably 1000-4000.

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

The CPR (unit: dimensionless) (Controlled Polymerization Rate, an index indicating the amount of basic substances in the polyether derivative: JIS K-1557 6.8 compliant) of the polyether derivative (E) used in the present invention is 2. The CPR is preferably 0 or less, more preferably 1.0 or less. A polyether derivative adjusted to have a CPR within this range after a purification treatment with an adsorbent has excellent compatibility with a polycarbonate resin, is prevented from decomposition and deterioration, and has excellent storage stability. For example, polycerine DCB2000 (CPR less than 1.0), polycerine 60-2000H (CPR less than 1.0), PTG-1000SN (CPR less than 1.0), and the like.

The pH of the polyether derivative (E) used in the present invention is preferably from 5.0 to less than 7.5, more preferably from 6.0 to less than 7.0. The pH of commercially available polyether derivatives may change depending on storage conditions, etc., but in general, polyether derivatives adjusted to less than 5.0 to 7.5 are more excellent in storage stability because decomposition and deterioration are prevented. It does not adversely affect the hue of the resulting 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), the initial stage of the molded article made of the obtained aromatic polycarbonate resin composition while maintaining and improving the excellent optical properties required for the optical molded article. It is possible to prevent deterioration such as deterioration due to usage conditions and deterioration due to aging 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 aimed at by the present invention can be obtained. Epoxy compound (F) is, for example, 3′,4′-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, epoxidized soybean oil, ε-caprolactone-modified 3′,4′-epoxycyclohexylmethyl 3,4- Epoxycyclohexane carboxylate, epoxy group-containing acrylic/styrene polymer, 2,2-bis(4-hydroxycyclohexyl)propane-diglycidyl ether and the like can be contained. 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 0.001 to 0.2 parts by mass of the epoxy compound (F) with respect to 100 parts by mass of the aromatic polycarbonate resin (A). More preferably 0.002 to 0.1 parts by mass, particularly preferably 0.005 to 0.05 parts 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) with respect to 100 parts by mass of the aromatic polycarbonate resin (A), an optical molded article While maintaining and improving the excellent optical properties required for , it improves the initial optical properties (integrated transmittance and yellowness) of the molded product made of the obtained aromatic polycarbonate resin composition, and deteriorates due to usage conditions and aging deterioration. It is possible to prevent deterioration such as

Furthermore, the aromatic polycarbonate resin composition according to the embodiment may contain, for example, heat stabilizers, other antioxidants, colorants, release agents, softeners, antistatic agents, as long as the effects of the present invention are not impaired. Various additives such as agents, impact modifiers, and polymers other than the aromatic polycarbonate resin (A) may be appropriately added.

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

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

Examples of benzotriazole compounds include 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-tetrahydrophthalimidylmethyl)phenol, 2-(2-hydroxy-4-octyloxyphenyl)-2H-benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)-2H-benzotriazole, 2-[2 '-hydroxy-3,5-di(1,1-dimethylbenzol)phenyl]-2H-benzotriazole, 2,2'-methylenbis[6-(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, and examples thereof include TINUVIN 329 (TINUVIN is a registered trademark) manufactured by BASF, Seesorb manufactured by Shipro Kasei Co., Ltd. 709, Chemisorb 79 manufactured by Chemipro Kasei Co., Ltd., etc. are commercially available.

Examples of triazine compounds include 2,4-diphenyl-6-(2-hydroxyphenyl-4-hexyloxyphenyl)1,3,5-triazine, 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 compound, for example, Sanduvor VSU manufactured by Clariant Japan Co., Ltd. is commercially available.
Benzophenone compounds include, for example, 2,4-dihydroxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, and the like.

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

The aromatic polycarbonate resin composition of the embodiment of the present invention is obtained by mixing an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and a specific aromatic compound (D), and optionally Depending on the circumstances, a production method in which the polyether derivative (E), the epoxy compound (F), the various additives described above, and a polymer other than the aromatic polycarbonate resin (A) are mixed can be exemplified. As long as the aromatic polycarbonate resin composition aimed at by the present invention can be obtained, the production method is not particularly limited, and the kind and amount of each component can be adjusted as appropriate. The method of mixing the components is also 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. Pellets of the aromatic polycarbonate resin composition can be easily obtained by these methods. The specific aromatic compound (D) may be mixed before melt-kneading, or may be added or mixed in advance with the fatty acid ester (C) or the polyether derivative (E).

The shape and size of the pellets of the aromatic polycarbonate resin composition obtained as described above are not particularly limited as long as they have the shape and size of ordinary resin pellets. For example, the shape of the pellet may be an elliptical columnar shape, a columnar shape, or the like. As for the size of the pellet, it is preferable that the length is about 2 to 8 mm, and in the case of an elliptical cylinder, it is preferable that the long axis of the cross-sectional ellipse is about 2 to 8 mm and the short axis is about 1 to 4 mm. In the case of a cylindrical shape, it is preferable that the diameter of the cross-sectional circle is about 1 to 6 mm. In addition, each pellet obtained 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 this. , and there is no particular limitation.

An optical molded article according to an embodiment of the present invention can be obtained by molding the above aromatic polycarbonate resin composition.

The method for producing the optical molded article is not particularly limited as long as the optical molded article aimed at by the present invention can be obtained. and a method of molding.

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

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

EXAMPLES The present invention will be specifically described below with reference to Examples, but the present invention is not limited to these Examples. "Parts" and "%" are based on weight unless otherwise specified.

The following materials 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 Polyca 200-80 (trade name) manufactured by Sumika Polycarbonate Co., Ltd. "SD Polyca" is a registered trademark of Sumika Polycarbonate Co., Ltd. , hereinafter also referred to as "PC" or (A1)

［ＢＡＳＦ社製のイルガフォス１６８（商品名）、以下（Ｂ１）ともいう］ 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, hereinafter also referred to as (B1)]

［ＡＤＥＫＡ製のアデカスタブＰＥＰ－３６（商品名）、以下（Ｂ２）ともいう］ 2-2. 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 Stub PEP-36 (trade name) manufactured by ADEKA, hereinafter also referred to as (B2)]

3. Fatty acid ester (C):
Glycerin Monostearate Rikemar S-100A
(Product 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 units and propylene glycol units (random copolymerization)
Weight average molecular weight: 2000, Polycerine DCB-2000 (trade name) manufactured by NOF Corporation, hereinafter also referred to as (E1).

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

5-3. Polytetramethylene glycol Weight average molecular weight: 1000, PTG-1000SN (trade name) manufactured by Hodogaya Chemical Industry Co., Ltd., hereinafter also referred to as (E3)6. Epoxy compound (F)
3′,4′-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate [Celoxide 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)
The above raw materials are put into a tumbler at once in the proportions shown in Tables 1 and 2, dry-mixed for 10 minutes, and then melted using a twin-screw extruder (manufactured by Japan Steel Works, Ltd., TEX30α). Melt-kneading was performed at a temperature of 220° C. to obtain pellets of the aromatic polycarbonate resin compositions of Examples 1-11 and Comparative Examples 1-5.
The pellets obtained in Examples and Comparative Examples are all substantially cylindric, and the aggregate of 100 pellets has an average length of about 5.1 mm to about 5.4 mm and 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 each evaluation were produced and subjected to evaluation according to the following method. The results are shown in Tables 1 and 2.

(Method for preparing test piece)
After drying the obtained pellets 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 multi-purpose test piece A type (total length 168 mm x thickness 4 mm) specified in "Test piece" was prepared. The end face of this test piece was cut, and the cut end face was mirror-finished using a resin plate end face mirror finishing machine (manufactured by Megalo Technica Co., Ltd., Plabeauty PB-500).

(Evaluation method for integrated transmittance)
A spectrophotometer (UH4150, manufactured by Hitachi, Ltd.) was equipped with a long optical path measurement accessory, and a 50 W halogen lamp was used as the light source. Using 2.8 mm, the spectral transmittance of each test piece was measured in the entire length direction of the test piece at every 1 nm in the wavelength range of 380 to 780 nm. Each integrated transmittance was obtained by integrating the measured spectral transmittances and rounding off to the nearest ten. An integrated transmittance of 32,000 or more was evaluated as good (indicated by ⊚ in the table), less than 32,000 and 30,000 or more as usable (indicated by ◯ in the table), and less than 30,000 as poor (indicated by x in the table).

(Method for evaluating yellowness)
Based on the spectral transmittance measured in the integrated transmittance evaluation method, the yellowness index (hereinafter referred to as YI) of each sample was obtained in a 10-degree field of view using standard light source D65. A YI of 12 or less was considered good (indicated by ◎ in the table), a value of more than 12 and 13 or less was usable (indicated by ○ in the table), and a value of more than 13 was considered to be defective (indicated by × in the table). .

(Heat test evaluation of molded product)
The test pieces prepared above were placed in an inert oven IPHH-201M manufactured by Espec Co., Ltd., and subjected to a heating test at 200° C. for 72 hours.
Next, the surface of each test piece was visually observed. The condition after the heating test was evaluated according to the following criteria. The results are shown in Tables 1-3.
A: Colorless and transparent.
◯: Transparent and usable, but slightly colored.
x: Opaque or darkly colored.

Tables 1 and 2 also show raw materials, blending ratios, and evaluation results for each example and comparative example.

The aromatic polycarbonate resin compositions of Examples 1 to 11 contain an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and a specific aromatic compound (D), and if necessary It contains a polyether derivative (E) and an epoxy compound (F) in specific proportions. Therefore, the test piece molded from the aromatic polycarbonate resin composition has a high integrated transmittance, a small yellowness, and almost no deterioration after the heating test.

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

In contrast, the molded articles molded from the aromatic polycarbonate resin compositions of Comparative Examples 1 to 5 were inferior in at least one of brightness, hue, and results after the heating test.

As described above, the embodiment has been described as an illustration of the technique of the present invention. We have provided a detailed explanation for this.

Therefore, the components described in the detailed description include not only components that are essential for solving the problem, but also components that are not essential for solving the problem in order to exemplify the above technology. obtain. Therefore, the fact that those non-essential components are listed in the detailed description should not be taken as an immediate finding that those non-essential components are essential.

In addition, the above-described embodiments are intended to illustrate the technology of the present invention, and various modifications, replacements, additions, omissions, etc. can be made within the scope of the claims or equivalents thereof.

２．
前記リン系酸化防止剤（Ｂ）が、下記亜リン酸エステル構造を有する亜リン酸エステル化合物を含有する、上記１記載の芳香族ポリカーボネート樹脂組成物。

３．
前記リン系酸化防止剤（Ｂ）が、下記式（１）及び（２）で表される亜リン酸エステル化合物から選択される少なくとも１種以上の化合物を含有する、上記１に記載の芳香族ポリカーボネート樹脂組成物。
式（１）：

［式中、Ｒ ^１ は、炭素数１～２０のアルキル基又はアルキル基で置換されていてもよいアリール基を示し、ａは、０～３の整数を示す。］
式（２）：

［式中、Ｒ ^９ 、Ｒ ^１０ は炭素数１～２０のアルキル基、またはアルキル基で置換されてもよいアリール基を、ｂ及びｃは整数０～３を示す。］
４．
下記のことから選択される少なくとも１を満たす、上記３に記載の芳香族ポリカーボネート樹脂組成物。
前記式（１）で表される亜リン酸エステル化合物が、トリス（２，４－ジ－ｔ－ブチルフェニル）フォスファイトを含有すること；及び
前記式（２）で表される亜リン酸エステル化合物が、３，９－ビス（２，６－ジ－ｔｅｒｔ－ブチル－４－メチルフェノキシ）－２，４，８，１０－テトラオキサ－３，９－ジホスファスピロ［５，５］ウンデカンを含有すること。
５．
前記リン系酸化防止剤（Ｂ）が、少なくとも一般式（１）で表される化合物を含み、該一般式（１）で表される化合物の量が、リン系酸化防止剤（Ｂ）全量の２０～１００質量％である、上記３又は４に記載の芳香族ポリカーボネート樹脂組成物。
６．
前記リン系酸化防止剤（Ｂ）が、少なくとも２種の化合物を含み、その少なくとも２種の化合物のうちの１種が、一般式（１）で表される化合物であり、該一般式（１）で表される化合物の量が、リン系酸化防止剤（Ｂ）全量の２０～９０質量％である、上記３又は４に記載の芳香族ポリカーボネート樹脂組成物。
７．
前記脂肪酸エステル（Ｃ）が、脂肪族カルボン酸とアルコールとの縮合化合物を含む、上記１～６のいずれか１つに記載の芳香族ポリカーボネート樹脂組成物。
８．
前記脂肪酸エステル（Ｃ）は、炭素数６～３６の、脂肪族モノカルボン酸及び脂肪族ジカルボン酸と、炭素数３０以下の、脂肪族飽和一価アルコール及び脂肪族飽和多価アルコールとのエステルを含む、上記７に記載の芳香族ポリカーボネート樹脂組成物。
９．
前記脂肪酸エステル（Ｃ）が、グリセリンモノステアレートである、上記８に記載の芳香族ポリカーボネート樹脂組成物。
１０．
芳香族ポリカーボネート樹脂（Ａ）１００重量部に対して、更に、下記式（５）で表され、５００～８０００の重量平均分子量を有するポリエーテル誘導体（Ｅ）を０．１重量部以上２．０重量部含有する、上記１～９のいずれか１つに記載の芳香族ポリカーボネート樹脂組成物。
式（５）：
ＲＯ－（Ｘ－Ｏ）ｍ（Ｙ－Ｏ）ｎ－Ｒ’
（式中、ＲおよびＲ’は、それぞれ独立して水素原子または炭素数１～３０のアルキル基を示し、Ｘは、炭素数２～４の直鎖アルキレン基又は分岐アルキレン基を示し、Ｙは、炭素数２～５の直鎖アルキレン基又は分岐アルキレン基を示し、ＸとＹは同一であっても異なっていても良く、ｍ及びｎは、各々独立して、３～６０を示し、ｍ＋ｎは６～１２０を示す。）
１１．
前記芳香族ポリカーボネート樹脂（Ａ）１００重量部に対して、さらに、エポキシ化合物（Ｆ）を、０．００１～０．２質量部含有する、上記１～１０のいずれか１つに記載の芳香族ポリカーボネート樹脂組成物。
１２．
前記エポキシ化合物（Ｆ）が、３’，４’－エポキシシクロヘキシルメチル－３，４－エポキシシクロヘキサンカルボキシレートを含有する、上記１１に記載の芳香族ポリカーボネート樹脂組成物。
１３．
熱安定剤、酸化防止剤、着色剤、離型剤、軟化剤、帯電防止剤及び衝撃性改良剤を含有する群から選択される少なくとも１種を更に含有する、上記１～１２のいずれか１つに記載の芳香族ポリカーボネート樹脂組成物。
１４．
上記１～１３のいずれかに記載の芳香族ポリカーボネート樹脂組成物を含有する光学用成形品。
１５．
前記光学用成形品が、導光フィルム、車両用ライトガイド及び銘板から選択される成形品を含有する、上記１４記載の光学用成形品。
１６．
上記１～１３のいずれか１つに記載の芳香族ポリカーボネート樹脂組成物を成形することを含有する、光学用成形品の製造方法。
The aromatic polycarbonate resin composition of the present invention is excellent in heat stability and weather resistance without impairing the properties such as heat resistance and mechanical strength inherent in the polycarbonate resin, and the aromatic polycarbonate resin of the present invention. Even when molded articles containing the composition are heated, they are excellent in appearance and optical properties. Therefore, even when the surface of the light guide plate is heated by irradiating the surface of the light guide plate with a thin light guide light source having a thickness of about 0.3 mm for a long period of time, the hue of the obtained light guide plate changes and the appearance of the light guide plate changes. and optical properties are not deteriorated, and the industrial utility value is extremely high.

This specification includes the following embodiments.
1.
An aromatic polycarbonate resin composition containing an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and an aromatic compound (D) represented by the following formula, Per 100 parts by weight of polycarbonate resin (A), 0.01 to 0.1 parts by weight of phosphorus antioxidant (B), 0.01 to 0.5 parts by weight of fatty acid ester (C), and aromatic An aromatic polycarbonate resin composition containing 0.0001 parts by weight or more and less than 0.05 parts by weight of the compound (D).
formula:

2.
2. The aromatic polycarbonate resin composition according to 1 above, wherein the phosphorus-based antioxidant (B) contains a phosphite ester compound having the following phosphite structure.

3.
2. The aromatic compound according to 1 above, wherein the phosphorus antioxidant (B) contains at least one compound selected from phosphite ester compounds represented by the following formulas (1) and (2) Polycarbonate resin composition.
Formula (1):

[In the formula, R ¹ represents an alkyl group having 1 to 20 carbon atoms or an aryl group optionally substituted with an alkyl group, and a represents an integer of 0 to 3. ]
Formula (2):

[In the formula, 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; ]
4.
3. The aromatic polycarbonate resin composition according to 3 above, which satisfies at least one selected from the following.
The phosphite ester compound represented by the formula (1) contains tris(2,4-di-t-butylphenyl)phosphite; and
The phosphite ester compound represented by the formula (2) is 3,9-bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3, Contains 9-diphosphaspiro[5,5]undecane.
5.
The phosphorus 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 the total amount of the phosphorus antioxidant (B) 5. The aromatic polycarbonate resin composition according to 3 or 4 above, which is 20 to 100% by mass.
6.
The phosphorus antioxidant (B) contains at least two compounds, one of the at least two compounds is a compound represented by the general formula (1), and the general formula (1 ) is 20 to 90% by mass of the total amount of the phosphorus antioxidant (B), the aromatic polycarbonate resin composition according to 3 or 4 above.
7.
7. The aromatic polycarbonate resin composition as described in any one of 1 to 6 above, wherein the fatty acid ester (C) contains a condensation compound of an aliphatic carboxylic acid and an alcohol.
8.
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. 8. The aromatic polycarbonate resin composition according to 7 above.
9.
9. The aromatic polycarbonate resin composition as described in 8 above, wherein the fatty acid ester (C) is glycerin monostearate.
10.
To 100 parts by weight of the aromatic polycarbonate resin (A), 0.1 parts by weight or more of a polyether derivative (E) represented by the following formula (5) and having a weight average molecular weight of 500 to 8000 is added. 10. The aromatic polycarbonate resin composition according to any one of 1 to 9 above, containing parts by weight.
Formula (5):
RO-(X-O)m(Y-O)n-R'
(Wherein, R and R' each independently represents a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents a linear or branched alkylene group having 2 to 4 carbon atoms, and Y is , represents a linear or branched alkylene group having 2 to 5 carbon atoms, X and Y may be the same or different, m and n each independently represents 3 to 60, m + n indicates 6 to 120.)
11.
11. The aromatic according to any one of 1 to 10 above, further containing 0.001 to 0.2 parts by mass of an epoxy compound (F) with respect to 100 parts by weight of the aromatic polycarbonate resin (A). Polycarbonate resin composition.
12.
12. The aromatic polycarbonate resin composition as described in 11 above, wherein the epoxy compound (F) contains 3′,4′-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate.
13.
Any one of the above 1 to 12, further containing at least one selected from the group containing heat stabilizers, antioxidants, colorants, release agents, softeners, antistatic agents and impact modifiers. The aromatic polycarbonate resin composition according to 1.
14.
14. An optical molded article containing the aromatic polycarbonate resin composition according to any one of 1 to 13 above.
15.
15. The optical molded article according to 14 above, wherein the optical molded article contains a molded article selected from a light guide film, a vehicle light guide and a nameplate.
16.
14. A method for producing an optical molded article, comprising molding the aromatic polycarbonate resin composition according to any one of 1 to 13 above.

Claims (14)

An aromatic polycarbonate resin composition containing an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and an aromatic compound (D) represented by the following formula, Per 100 parts by weight of polycarbonate resin (A), 0.01 to 0.1 parts by weight of phosphorus antioxidant (B), 0.01 to 0.5 parts by weight of fatty acid ester (C), and aromatic A pellet of an aromatic polycarbonate resin composition containing 0.0001 to 0.003 parts by weight of compound (D).
formula:

2. The pellet of 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 ester compounds represented by the following formulas (1) and (2). Pellets of a group polycarbonate resin composition.
Formula (1):

[In the formula, R ¹ represents an alkyl group having 1 to 20 carbon atoms or an aryl group optionally substituted with an alkyl group, and a represents an integer of 0 to 3. ]
Formula (2):

[In the formula, 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; ] 4. The pellet of the aromatic polycarbonate resin composition according to claim 3, which satisfies at least one selected from the following.
The phosphite ester 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 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 the total amount of the phosphorus antioxidant (B) Pellets of the aromatic polycarbonate resin composition according to claim 3 or 4, which is 20 to 100% by mass. The phosphorus antioxidant (B) contains at least two compounds, one of the at least two compounds is a compound represented by the general formula (1), and the general formula (1 The amount of the compound represented by ) is 20 to 90% by mass of the total amount of the phosphorus antioxidant (B), pellets of the aromatic polycarbonate resin composition according to claim 3 or 4. Pellets of the aromatic polycarbonate resin composition according to any one of claims 1 to 6, wherein the fatty acid ester (C) comprises 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 saturated aliphatic polyhydric alcohol having 30 or less carbon atoms. Pellets of the aromatic polycarbonate resin composition according to claim 7, comprising: 9. Pellets of the aromatic polycarbonate resin composition according to claim 8, wherein the fatty acid ester (C) is glycerin monostearate. To 100 parts by weight of the aromatic polycarbonate resin (A), 0.1 parts by weight or more of a polyether derivative (E) represented by the following formula (5) and having a weight average molecular weight of 500 to 8000 is added. Pellets of the aromatic polycarbonate resin composition according to any one of claims 1 to 9, containing parts by weight.
Formula (5):
RO-(X-O)m(Y-O)n-R'
(Wherein, R and R' each independently represents a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents a linear or branched alkylene group having 2 to 4 carbon atoms, and Y is , represents a linear or branched alkylene group having 2 to 5 carbon atoms, X and Y may be the same or different, m and n each independently represents 3 to 60, m + n indicates 6 to 120.) The aromatic according to any one of claims 1 to 10, further containing 0.001 to 0.2 parts by mass of an epoxy compound (F) with respect to 100 parts by weight of the aromatic polycarbonate resin (A). Pellets of a group polycarbonate resin composition. Pellets of the aromatic polycarbonate resin composition according to claim 11, wherein the epoxy compound (F) contains 3',4'-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate. Any one of claims 1 to 12, further comprising at least one selected from the group containing heat stabilizers, antioxidants, colorants, release agents, softeners, antistatic agents and impact modifiers. Pellets of the aromatic polycarbonate resin composition according to item 1. A method for producing an optical molded article, comprising molding pellets of the aromatic polycarbonate resin composition according to any one of claims 1 to 13.