KR20200076616A - Aromatic polycarbonate resin composition and molded article for optical use - Google Patents

Abstract

The present invention provides an aromatic polycarbonate resin composition, which causes no damage upon the properties, such as heat resistance and mechanical strength, unique to a polycarbonate resin, has excellent heat stability and high light transmittance, and particularly shows high light transmittance, even when an article molded therefrom is heated. The aromatic polycarbonate resin composition includes an aromatic polycarbonate resin (A), a phosphorus-based antioxidant (B), a fatty acid ester (C), and a specific aromatic compound (D), wherein the phosphorus-based antioxidant is used in an amount of 0.01-1 parts by weight, the fatty acid ester (C) is used in an amount of 0.01-5 parts by weight, and the specific aromatic compound (D) is used in an amount equal to or more than 0.0001 parts by weight and less than 0.05 parts by weight, based on 100 parts by weight of the aromatic polycarbonate resin (A).

Description

Aromatic polycarbonate resin composition and molded article for optics{AROMATIC POLYCARBONATE RESIN COMPOSITION AND MOLDED ARTICLE FOR OPTICAL USE}

The present invention relates to an aromatic polycarbonate resin composition and a molded article for optics.

Since the polycarbonate resin is excellent in impact resistance, heat resistance and transparency, it is conventionally used in molded products such as light guide plates, various lenses, and name plates.

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

Patent Document 2 discloses a polycarbonate resin composition for an optical molded article in which a fluorescent whitening agent is blended with a resin component in which a specific amount of a bead-shaped crosslinked acrylic resin of 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 to obtain excellent light transmittance and improve the luminance of the optical member.

Japanese Patent Publication 2007-204737 Japanese Patent Publication No. 09-020860 Japanese Patent Publication No. 2011-133647 Japanese Patent Publication No. Hei 11-158364

However, the polycarbonate resin composition disclosed in Patent Literature 3 or Patent Literature 4 does not have a decrease in light transmittance even when it is molded at a high temperature to perform thin forming in particular as a material for light guide plates in recent years. The requirements of () are not enough. Moreover, in recent years, even if a molded article (for example, a light guide plate) of about 0.3 mm that has been molded and processed has been exposed to extremely long periods of time under high temperature conditions due to light irradiation or the like, there is little decrease in transparency (less cloudiness or coloring). Materials are required.

In the present invention, properties such as heat resistance and mechanical strength inherent to the polycarbonate resin are not impaired, excellent thermal stability, high light transmittance, and further, a molded article of about 0.3 mm thin (for example, molded) It is an object of the present invention to provide an aromatic polycarbonate resin composition that is unlikely to cause deterioration of transparency (difficult to cause cloudiness and coloring) even when the light guide plate) is exposed to high temperatures by light irradiation for a very long time.

The present inventors conducted extensive studies to solve these problems, and as a result, an aromatic polycarbonate resin containing an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C), and a specific aromatic compound (D). As a composition,

The heat resistance of the aromatic polycarbonate resin composition originally containing 0.01 to 0.1 parts by weight of the phosphorus antioxidant (B) and a predetermined amount of the fatty acid ester (C) relative to 100 parts by weight of the aromatic polycarbonate resin (A) , Without impairing the properties such as mechanical strength, excellent thermal stability, high light transmittance, and, in addition, a molded product (light guide plate) of about 0.3 mm in thickness, which has been molded, has been exposed over a long period of time under high temperature conditions due to irradiation with a light source. Even in this case, it was found that there was little decrease in transparency (difficult to cause cloudiness or coloring), and the present invention was completed.

That is, the present invention is 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:

Based on 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 to 0.05 parts by weight of the aromatic compound (D) An aromatic polycarbonate resin composition characterized by containing less than parts, and a molded article for optics formed by molding the same are provided.

expression:

The polycarbonate resin composition of the present invention does not impair properties such as heat resistance and mechanical strength inherent to the polycarbonate resin, has excellent thermal stability, high light transmittance, and further obtains a molded article. Even when exposed to the environment and/or high temperature conditions for a long period of time under irradiation of a light source, transparency is hardly deteriorated (it is difficult to cause cloudiness or coloring). Therefore, even for a thin molded article (light guide plate) having a thickness of, for example, about 0.3 mm, it is difficult to cause the color to change and deteriorate (deteriorate), even if exposed for a long period of time under high temperature conditions due to an external environment or a light source. It is difficult to cause a decrease in color (it is difficult to cause cloudiness or coloring), and the industrial use value is extremely high.

Embodiments will be described in detail below. However, the detailed description may be omitted more than necessary. For example, in some cases, detailed descriptions of well-known items or duplicate descriptions of substantially the same configuration may be omitted. This is to avoid unnecessarily lengthening the following description and to facilitate the understanding of those skilled in the art.

On the other hand, the inventors provide the following description in order for those skilled in the art to fully understand the present invention, and are not intended to limit the subject matter described in the claims by these.

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), and if necessary, a polyether Derivatives (E), epoxy compounds (F), and/or other components.

In the embodiment of the present invention, "aromatic polycarbonate resin (A)" is a polycarbonate resin based on an aromatic compound, and the present invention is particularly limited as long as the desired aromatic polycarbonate resin composition can be obtained. none. As such an aromatic polycarbonate resin, for example, a phosgene method in which various dihydroxydiaryl compounds and phosgene are reacted, or an ester in which a dihydroxydiaryl compound is reacted with a carbonic acid ester such as diphenyl carbonate. The polymer obtained by an exchange method can be illustrated. A representative example contains a polycarbonate resin prepared 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( Bis(hydroxyaryl)alkanes such as 4-hydroxy-3,5-dibromophenyl)propane and 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane; Bis(hydroxyaryl)cycloalkanes such as 1,1-bis(4-hydroxyphenyl)cyclopentane and 1,1-bis(4-hydroxyphenyl)cyclohexane; Dihydroxydiaryl ethers such as 4,4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether; Dihydroxydiaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide; Dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; Dihydroxydiaryl sulfones, such as 4,4'- dihydroxydiphenyl sulfone and 4,4'- dihydroxy-3,3'- dimethyldiphenyl sulfone, can be illustrated. These may be used alone or in combination. In addition to these, piperazine, dipiperidylhydroquinone, resorcin, 4,4'-dihydroxydiphenyl, and the like can be used in combination.

Moreover, you may use combining the said dihydroxy diaryl compound and the aromatic compound of trivalence or more shown below, for example.

As the above-mentioned trivalent or higher phenolic compound, for example, phloroglucine, 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)-bensol, 1,1,1-tri-(4-hydride Hydroxyphenyl)-ethane and 2,2-bis-[4,4-(4,4'-dihydroxydiphenyl)-cyclohexyl]-propane, and the like.

The aromatic polycarbonate resin (A) preferably has a viscosity average molecular weight of 10000 to 100000, more preferably 12000 to 30000. On the other hand, when manufacturing such an aromatic polycarbonate resin (A), a molecular weight modifier, a catalyst, and the like can be used as necessary.

Although the phosphorus-based antioxidant (B) in the embodiment of the present invention is not particularly limited as long as the aromatic polycarbonate resin composition for which the present invention is intended is obtained, those containing a phosphorous acid ester compound having the following phosphorous acid ester structure desirable.

In the aromatic polycarbonate resin composition of the embodiment of the present invention, the phosphorus-based antioxidant (B) is a phosphorous acid ester compound represented by the following formula (1), a phosphorous acid ester compound represented by the following formula (2), and the following formula (3) It is preferable to contain at least one compound selected from the phosphorous acid ester compound represented by and the phosphorous acid ester compound represented by the following formula (4). The phosphorus antioxidant (B) works together with the fatty acid ester (C) and the specific aromatic compound (D) described below, and thermal stability is obtained without impairing properties such as heat resistance and mechanical strength of the resulting polycarbonate resin composition. This excellent, light transmittance is high, and even if the molded article (light guide plate) of about 0.3 mm molded and processed is exposed over a long period of time under high temperature conditions by light source irradiation or the like, the reduction in transparency is reduced (white or colored). Ingredients).

It is preferable that phosphorus antioxidant (B) contains the compound represented by following formula (1), for example.

Equation (1):

(In the formula, 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, but more preferably, it is 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. Can. Among these, tris(2,4-di-t-butylphenyl)phosphite is particularly suitable, and for example, monovalent 168 ("mongafos" manufactured by BASF is a registered trademark of BSF Societas Europia). ) As commercially available.

It is preferable that phosphorus antioxidant (B) contains the compound represented by following formula (2), for example.

Equation (2):

(In the formula, R ⁹ and R ¹⁰ each independently 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 independently represent an integer of 0 to 3).

As a compound represented by Formula (2), bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, phenyl bisphenol A pentaerythritol diphosphite, etc. are mentioned, for example. Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite is commercially available from ADEKA, under the trade name "Adeka Stab PEP-24G". Adeka Stab PEP-36 (registered trademark of "Adeka Stab") manufactured by ADEKA Co., Ltd. is commercially available.

It is preferable that phosphorus antioxidant (B) contains the compound represented by following formula (3), for example.

Equation (3):

(In the formula, 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, an alkylcycloalkyl group having 6 to 12 carbon atoms, or 7 to 12 carbon atoms. R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms X is a single bond, a sulfur atom or a formula: -CHR ⁷ -(where R ⁷ is a hydrogen atom, 1 to 1 carbon atoms A group represented by an alkyl group of 8 or a cycloalkyl group having 5 to 8 carbon atoms A is an alkylene group having 1 to 8 carbon atoms or a formula: *-COR ^8- (where R ⁸ is a single bond or 1 to 1 carbon atoms. 8 represents an alkylene group and * represents a group represented by an oxygen-side bonding group) Y and Z are either hydroxyl groups, 1 to 8 carbon atoms alkoxy groups, or 7 to 12 carbon atoms aralkyloxy. Group, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.)

In formula (3), 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, an alkylcycloalkyl group having 6 to 12 carbon atoms, a carbon number 7-12 Aralkyl group or phenyl group.

Here, as the alkyl group having 1 to 8 carbon atoms, for example, 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, i-octyl group, t-octyl group, 2-ethylhexyl group, etc. are mentioned. Examples of the cycloalkyl group having 5 to 8 carbon atoms include cyclopentyl group, cyclohexyl group, cycloheptyl group, and cyclooctyl group. Examples of the alkylcycloalkyl group having 6 to 12 carbon atoms include 1-methylcyclopentyl group, 1-methylcyclohexyl group, and 1-methyl-4-i-propylcyclohexyl group. Examples of the aralkyl group having 7 to 12 carbon atoms include benzyl group, α-methylbenzyl group, α,α-dimethylbenzyl group, and the like.

It is preferable that 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, it is preferable that R ² and R ⁵ are 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 has 1 to 5 carbon atoms such as methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group and t-pentyl group. It is preferably an alkyl group, and 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, i-propyl group, n-butyl group, i- It is more preferable that it is a C1-C5 alkyl group, such as a butyl group, a sec-butyl group, a t-butyl group, and a t-pentyl group.

In 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 alkyl groups exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ above. In particular, 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 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 cycloalkyl group having 5 to 8 carbon atoms include, for example, the alkyl groups and cycloalkyl groups exemplified in the descriptions of R ² , R ³ , R ⁵ and R ⁶ , respectively. In particular, X is preferably a methylene group substituted with a single bond, a methylene group, or a methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group, and the like. It is more preferred to be a bond.

In Formula (3), A represents a C1-C8 alkylene group or a group represented by Formula: *-COR ⁸ -. Examples of the alkylene group having 1 to 8 carbon atoms include, for example, methylene group, ethylene group, propylene group, butylene group, pentamethylene group, hexamethylene group, octamethylene group, and 2,2-dimethyl-1,3-propylene group. Etc. are mentioned, Preferably it is a propylene group. Further, 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, for example, alkylene groups exemplified in the description of A above. R ⁸ is preferably a single bond or an ethylene group. Note that * in the formula: *-COR ⁸ -is an oxygen-side bond, and indicates that the carbonyl group is bonded to the oxygen atom of the phosphite group.

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

As the compound represented by 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]dioxaphosphine, 6-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propoxy]-2, 4,8,10-tetra-t-butyldibenzo[d,f][1,3,2]dioxaphosphine, 6-[3-(3,5-di-t-butyl-4-hydroxy Phenyl)propoxy]-4,8-di-t-butyl-2,10-dimethyl-12H-dibenzo[d,g][1,3,2]dioxaphosphocin, 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, in the case where an aromatic polycarbonate resin composition obtained is used in a field requiring optical properties, 2,4,8,10-tetra-t-butyl-6-[3-(3-methyl-4-hydride) Roxy-5-t-butylphenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphosphine is suitable, for example, Sumitomo Chemical Co., Ltd. smizerizer GP (' Smillizer” is commercially available as a registered trademark.

It is preferable that phosphorus antioxidant (B) contains the compound represented by following formula (4), for example.

Equation (4):

(In the formula, 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 are mutually R ¹⁹ to R ²² each independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, and d to g are each independently an integer of 0 to ^5. X ^{1 to} X ⁴ are Each independently represents a single bond or a carbon atom. When X ^{1 to} X ⁴ are a single bond, functional groups linked to the single bond among R ¹¹ to R ²² are excluded from the formula (4).)

As a specific example of the compound represented by Formula (4), bis(2,4-dicumylphenyl) pentaerythritol diphosphite is mentioned, for example. This was manufactured by Dover Chemical, trade name "Doverphos (registered trademark) S-9228", manufactured by ADEKA, and trade name "Adeka Stab PEP-45" (bis(2,4-dicumylphenyl) pentaerythritol diphosphite). It is commercially available.

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

It is preferable that the phosphorus-based antioxidant (B) contains at least one compound selected from phosphorous acid ester compounds represented by formulas (1) and (2).

It is preferable to satisfy at least one selected from the following.

The phosphorous acid ester compound represented by the formula (1) contains tris(2,4-di-t-butylphenyl)phosphite; And

The phosphorous acid ester compound represented by the formula (2) is 3,9-bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9- Diphospha spiro [5,5] containing 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 formula (1). In this case, the amount of the compound represented by the formula (1) is preferably 20 to 90% by mass, more preferably 30 to 80% by mass, and more preferably 40 to 70% by mass, of the total amount of the phosphorus-based antioxidant (B). It is particularly preferred to be.

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

The fatty acid ester (C) works together with the phosphorus-based antioxidant (B) and a specific aromatic compound (D) to be described later, and thermal stability without impairing properties such as heat resistance and mechanical strength of the resulting polycarbonate resin composition. Excellent, high light transmittance, and even when the molded article (light guide plate) of about 0.3 mm molded and processed is exposed over a long period of time under high temperature conditions due to light irradiation or the like, to reduce transparency (to cause cloudiness or coloring). It is an ingredient that makes it difficult)

For example, thermal deterioration (cloudiness or coloring) caused by long-term light irradiation of an optically molded article molded from an aromatic polycarbonate resin composition with a light source (such as an LED light source) is effectively prevented. The optical molded article, under severe conditions such as salty weather and/or continued to be irradiated for a long time, may increase the temperature of the surface of the molded article, and the aromatic polycarbonate resin (A) contained in the aromatic polycarbonate resin composition may Thermal degradation may proceed little by little. In addition, the fatty acid ester (C) in the resin composition may be gradually denatured, impairing the transparency (brightness or light transmittance) expected of the aromatic polycarbonate resin composition used in a conventional optical molded article, and clouding the molded article surface or Coloring (light to dark coloring) may occur.

The present inventors studied in earnest in light of this problem, and as a result of the deterioration of the fatty acid ester (C), such as deterioration and coloring caused by it, the specific aromatic compound (D) of the following formula is particularly effective, and specific aromatic By adding the compound (D) before melt-kneading to obtain an aromatic polycarbonate resin composition, deterioration of the fatty acid ester (C) in the molded article is suppressed to reduce or alleviate cloudiness or coloring (light to dark coloring). The present invention was completed with the idea of being able to.

expression:

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

Examples of the aliphatic carboxylic acid include saturated or unsaturated monocarboxylic acids, dicarboxylic acids, and tricarboxylic acids. On the other hand, alicyclic carboxylic acid is also contained in the said aliphatic carboxylic acid. 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 carbon number of the carboxylic acid is preferably 8 to 32, more preferably 10 to 28, and particularly preferably 12 to 24.

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, lignoseric acid, serotic acid, melisic acid, And tetratriacontanic acid, montanic acid, glutaric acid, adipic acid, and azelaic acid.

As said alcohol, saturated or unsaturated monohydric alcohol and polyhydric alcohol are mentioned, These alcohols may have substituents, such as a fluorine atom, a chlorine atom, a bromine atom, and an aryl group. Among these, saturated alcohols having 30 or less carbon atoms are preferable, and aliphatic saturated monohydric alcohols and aliphatic saturated polyhydric alcohol having 30 or fewer carbon atoms are more preferable. On the other hand, alicyclic alcohol is also contained in aliphatic alcohol. It is preferable that carbon number of alcohol is 26 or less, and it is more preferable that it is 22 or less.

As specific examples of the alcohol, for example, octanol, decanol, dodecanol, tetradecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2, 2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, dipentaerythritol, and the like.

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

As specific examples of the fatty acid ester (C), for example, behenyl behenate, octyldodecyl behenate, stearyl stearate, glycerin monopalmitate, glycerin monostearate, glycerin monooleate, glycerin distearate, glycerin Tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, pentaerythritol tetrastearate, etc., alone or in combination of two The above can be used in combination. Among these, stearic acid esters such as glycerin monostearate and pentaerythritol distearate are suitable. For example, Riquemal S-100A (trade name) manufactured by Rikenvitamin Co., Ltd. or Nichiyu Co., Ltd. Unister H476DP (registered trademark of "Unice") 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, and more preferably 0.05 to 0.2 parts by weight based on 100 parts by weight of the polycarbonate resin (A). When the amount of the fatty acid ester (C) is less than 0.01 part by weight, the effect of suppressing yellowing and improving color is insufficient. Conversely, even when the amount of the fatty acid ester (C) exceeds 0.5 parts by weight, the effect of improving color becomes insufficient.

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 an aromatic compound (D) represented by the following formula. Accordingly, as an aromatic polycarbonate resin composition that may contain a polyether derivative (E), an epoxy compound (F), and/or other additives, properties such as heat resistance and mechanical strength of the aromatic polycarbonate resin composition inherently obtained thereby are obtained. Even without damage, excellent thermal stability, high light transmittance, and even if a molded article (light guide plate) of about 0.3 mm thin by molding is exposed over a long period of time under high temperature conditions, such as by irradiation with a light source, there is a decrease in transparency. Less (it becomes difficult to cause cloudiness or coloring).

expression:

For example, thermal deterioration (cloudiness or coloring) caused by long-term light irradiation of an optically molded article molded from an aromatic polycarbonate resin composition with a light source (such as an LED light source) is effectively prevented. In the case of optical molded articles, under severe conditions such as salty weather and/or when light irradiation is continued for a long time, the temperature of the molded article may increase, and fatty acid ester (C) or polyether derivative (E) as required The thermal deterioration of the aromatic polycarbonate resin (A) included in the aromatic polycarbonate resin composition is deteriorated by the influence of heating.

The present inventors studied in earnest in light of this problem, and as a result of the deterioration of the fatty acid ester (C) or the deterioration of the polyether derivative (E), if necessary, the specific aromatic compound (D) of the above formula Particularly effective, by adding a specific aromatic compound (D) in advance or before melt kneading to obtain an aromatic polycarbonate resin composition, a fatty acid ester (C) in a molded article or a polyether derivative (E) as required The present invention was completed with the idea that the deterioration of) can be suppressed to reduce or alleviate cloudiness or coloring (light to dark coloring).

The amount of the specific aromatic compound (D) used in the embodiment of the present invention is preferably 0.0001 to less than 0.05 parts by weight, and preferably 0.0005 to more than 0.003 parts by weight based on 100 parts by weight of the aromatic polycarbonate resin (A). When the amount of the aromatic compound (D) is less than 0.0001 parts by weight, the effect of suppressing cloudiness or coloring is insufficient. Conversely, when the amount of the aromatic compound (C) is 0.05 parts by weight or more, it is not preferable because the high level of light transmittance and color required for the optical molded body may not be achieved.

In the embodiment of the present invention, as described above, a polyether derivative (E) may be further included as necessary. The polyether derivative is a derivative of the polyether compound and is not particularly limited as long as the aromatic polycarbonate resin composition for which the present invention is intended can be obtained. Such a polyether derivative contains a polyether derivative represented by the following formula (5) as a representative example.

Equation (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 is a straight chain alkylene group having 2 to 4 carbon atoms or branched alkylene group, and Y is a straight chain alkylene group having 2 to 5 carbon atoms. Or 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) is preferably 500 to 8000, and more preferably 1000 to 4000.

A commercially available product can be used for the polyether derivative represented by Formula (5).

It is preferable that the polyether derivative represented by Formula (5) is the following Formula (5-1).

The following formula (5-1):

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 is a straight chain alkylene group having 2 to 4 carbon atoms, Y is a branched alkylene group having 2 to 5 carbon atoms, 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 500 to 8000, more preferably 1000 to 4000.

A commercially available product can be used for the polyether derivative represented by Formula (5-1).

It is preferable that the polyether derivative represented by Formula (5) is the following Formula (5-2).

The following formula (5-2):

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 is a straight chain alkylene group having 2 to 4 carbon atoms, Y is a straight chain alkylene group having 2 to 5 carbon atoms, and 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 100.)

The weight average molecular weight of the polyether derivative represented by formula (5-2) is preferably 500 to 8000, and more preferably 1000 to 4000.

A commercially available product can be used for the polyether derivative represented by Formula (5-2).

It is preferable that the polyether derivative represented by Formula (5) is the following Formula (5-3).

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 is a branched alkylene group having 2 to 4 carbon atoms, Y is a branched alkylene group having 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 500 to 8000, more preferably 1000 to 4000.

A commercially available product can be used for the polyether derivative represented by Formula (5-3).

The polyether derivative represented by Formula (5) includes the polyether derivative represented by Formula (6), the polyether derivative represented by Formula (7), and the polyether derivative represented by Formula (8), Polyether derivative represented by formula (9), polyether derivative represented by formula (10), polyether derivative represented by formula (11), polyether derivative represented by formula (12), formula ( It is preferable to contain at least 1 sort(s) 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 is preferable to contain at least one member selected from the group containing a derivative, a polyether derivative represented by formula (9), and a polyether derivative represented by formula (10).

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

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

Equation (6):

HO-(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)nH

(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 formula (6), a modified glycol composed of a tetramethylene glycol unit and a propylene glycol unit is suitable. Commercially available products can be used as such a polyether derivative, for example, Nichiyu Co., Ltd., polyserine DCB-1000 (weight average molecular weight 1000), polyserine DCB-2000 (weight average molecular weight 2000), Polyserine DCB-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 formula (6) is preferably 500 to 8000, more preferably 1000 to 4000.

Equation (7):

HO-(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH ₂ CH(CH ₃ )CH ₂ O)nH

(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 formula (7), a modified glycol composed of a tetramethylene glycol unit and a 2-methyl tetramethylene glycol unit is preferable. As such a polyether derivative, a commercial item 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) or the like can be used.

The weight average molecular weight of the polyether derivative represented by formula (7) is preferably 500 to 8000, and more preferably 1000 to 4000.

Equation (8):

HO-(CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)nH

(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 formula (8), a modified glycol composed of an ethylene glycol unit and a propylene glycol unit is preferable. As such a polyether derivative, a commercial item can be used, for example, Nichiyu Co., Ltd., UniLube 50DE-25 (weight average molecular weight 1750), UniLube 75DE-25 (weight average molecular weight 1400), etc. Can be used.

The weight average molecular weight of the polyether derivative represented by formula (8) is preferably 500 to 8000, and more preferably 1000 to 4000.

Equation (9):

RO-(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)nH

(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, which is a single-ended butyl group or a single-ended stearyl group, is suitable. As such a polyether derivative, a commercial item can be used, for example, Nichiyu Co., Ltd., polyserine BC-1000 (one terminal butyl group, weight average molecular weight 1000), polyserine SC-1000 (one Terminal stearyl group, weight average molecular weight 1000), and the like.

The weight average molecular weight of the polyether derivative represented by formula (9) is preferably 500 to 8000, more preferably 1000 to 4000.

Equation (10):

RO-(CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)nH

(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, which is a single-ended butyl group or a single-ended stearyl group, is suitable. As such a polyether derivative, a commercial item can be used, for example, Nichiyu Co., Ltd., UniLube 50MB-11 (one-end butyl group, weight average molecular weight 1000), UniLube 50MB-26 Terminal butyl group, weight average molecular weight 2000), UniLube 50MB-72 (one terminal butyl group, weight average molecular weight 3000), UniLube 10MS-250KB (one terminal stearyl group, weight average molecular weight 2000) can be used.

The weight average molecular weight of the polyether derivative represented by formula (10) is preferably 500 to 8000, and more preferably 1000 to 4000.

Equation (11):

HO-(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH ₂ O) nH

(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 formula (11), a modified glycol composed of a tetramethylene glycol unit and an ethylene glycol unit is preferable. As such a polyether derivative, a commercial item can be used, for example, Nichiyu Co., Ltd., polyserine DC3000E (weight average molecular weight 3000), polyserine DC1800E (weight average molecular weight 1800), or the like can be used. .

The weight average molecular weight of the polyether derivative represented by formula (11) is preferably 500 to 8000, and more preferably 1000 to 4000.

Equation (12):

HO-(CH ₂ CH ₂ CH ₂ CH ₂ O) pH

(In the formula, p represents 6 to 100.)

As the polyether derivative represented by formula (12), polytetramethylene glycol is preferable. As such a polyether derivative, a commercial item can be used, for example, PTG-650SN (weight average molecular weight 650), PTG-850SN (weight average molecular weight 850), PTG- manufactured by Hodogaya Chemical Industries, 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 Formula (12) is preferably 500 to 8000, and more preferably 1000 to 4000.

Equation (13):

Formula: HO-(CH(CH ₃ )CH ₂ O)qH

(In the formula, q represents 7 to 120.)

As the polyether derivative represented by formula (13), polypropylene glycol is preferable. As such a polyether derivative, a commercial item can be used, for example, polyglycol P2000P (weight average molecular weight 2000) manufactured by Dow Chemical, Nichiyu Co., Ltd., and Uniol D-1000 (weight average molecular weight). 1000), Uniol D-2000 (weight average molecular weight 2000), and Uniol D-4000 (weight average molecular weight 4000).

The weight average molecular weight of the polyether derivative (polypropylene glycol) represented by formula (13) is preferably 500 to 8000, and more preferably 1000 to 4000.

Equation (14):

HO-(CH(C ₂ H ₅ )CH ₂ O)rH

(In the formula, r represents 6 to 100.)

As the polyether derivative represented by formula (14), polybutylene glycol is preferred. As such a polyether derivative, a commercial item can be used, for example, manufactured by Nichiyu Co., Ltd., Uniol PB-500 (weight average molecular weight 500), Uniol PB-1000 (weight average molecular weight 1000), Uniol PB-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 500 to 8000, and more preferably 1000 to 4000.

The polyether derivative represented by the formula (5) is generally high in heat resistance, and the molded article formed by molding the aromatic polycarbonate resin composition containing the polyether derivative at high temperature has high luminance or 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), and therefore, the aromatic polycarbonate containing the polyether derivative (B) The transparency of the molded article obtained from the resin composition is not reduced, and improvement in light transmittance and color can be expected. The weight average molecular weight of such a polyether derivative (B) is preferably 500 to 8000, and more preferably 1000 to 4000.

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

It is preferable that 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: conforming to JIS K-1557 6.8) is preferably 2.0 or less. And, more preferably, CPR is 1.0 or less. After the purification treatment with the adsorbent, the polyether derivative adjusted so that the CPR becomes such a range is more excellent in compatibility with the polycarbonate resin, and also prevents decomposition or deterioration, and thus has better 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, more preferably 6.0 to less than 7.0. Although the pH of commercially available polyether derivatives may change depending on the storage conditions, etc., the polyether derivatives adjusted to approximately 5.0 to less than 7.5 are prevented from decomposing or deteriorating to provide better storage stability, and the resulting polycarbonate resin It does not adversely affect the color of the composition. For example, it becomes 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 optically molded article, without deteriorating the initial optical properties of the molded article made of the obtained aromatic polycarbonate resin composition Deterioration such as deterioration or aging deterioration caused by the situation can be prevented.

The epoxy compound (F) is not particularly limited as long as it has at least one epoxy group in the molecule and the aromatic polycarbonate resin composition for which the present invention is intended is obtained. The epoxy compound (F) is, for example, 3',4'-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate, epoxidized soybean oil, ε-caprolactone modified 3',4'-epoxycyclo Hexylmethyl-3,4-epoxycyclohexane carboxylate, acrylic-styrene polymer containing an epoxy group, 2,2-bis(4-hydroxycyclohexyl)propane-diglycidyl ether, and the like. It is preferable that the epoxy compound (F) contains 3',4'-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.

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), and 0.002 to 0.1 parts by mass, based on 100 parts by mass of the aromatic polycarbonate resin (A). It is more preferable, and it is particularly preferable to contain 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), excellent optical properties required for the optical molded article are maintained. While improving, the initial optical properties (integrated transmittance and yellowness) of the molded article made of the obtained aromatic polycarbonate resin composition can be improved, and deterioration such as deterioration or aging deterioration due to the use situation can be prevented.

Moreover, in the range which does not impair the effect in this invention to the aromatic polycarbonate resin composition which concerns on embodiment, For example, heat stabilizers, other antioxidants, colorants, mold release agents, softeners, antistatic agents, impact modifiers, etc. Various additives, polymers other than the aromatic polycarbonate resin (A), and the like may be appropriately blended.

In 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 resulting aromatic polycarbonate resin composition, is suitably used depending on the use of a molded article obtained by molding the aromatic polycarbonate resin composition. Can.

As the ultraviolet absorber, for example, ultraviolet absorbers usually blended with polycarbonate resins such as benzotriazole-based compounds, triazine-based compounds, benzophenone-based compounds, and oxalic acid anilide-based compounds, alone or in combination of two or more thereof, It can be used in combination.

As a benzotriazole type compound, for example, 2-(2-hydroxy-5-t-octylphenyl)benzotriazole, 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-dimethylbenzyl)phenyl]-2H-benzotriazole, 2,2'-Methylenbis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3- tetramethylbutyl)phenol]. Among them, 2-(2-hydroxy-5-t-octylphenyl)benzotriazole and the like are particularly suitable, for example, TINUVIN 329 manufactured by BASF (TINUVIN is a registered trademark), manufactured by Cipro Chemical Co., Ltd. Seesov 709 of Kemipro Chemical Co., Ltd. chemisob 79 and the like are commercially available.

As the triazine-based compound, for example, 2,4-diphenyl-6-(2-hydroxyphenyl-4-hexyloxyphenyl)-1,3,5-triazine, 2-[4,6-bis (2,4-dimethylphenyl)-1,3,5-triazine-2-yl]-5-(octyloxy)phenol, 2-(4,6-diphenyl-1,3,5-triazine- 2-yl)-5-[(hexyl)oxy]phenol, and the like, for example, TINUVIN 1577 manufactured by BASF, etc. are commercially available.

As the oxalic acid anilide-based compound, for example, Sanduvor VSU manufactured by Clariant Japan Co., Ltd. is commercially available.

As a benzophenone type compound, 2,4-dihydroxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone etc. are mentioned, for example.

The amount of the ultraviolet absorber is 0 to 1.0 part by weight, and preferably 0 to 0.5 part by weight based on 100 parts by weight of the aromatic polycarbonate resin (A). When the amount of the ultraviolet absorber exceeds 1.0 part by weight, there is a fear that the initial color of the resulting aromatic polycarbonate resin composition is lowered. In addition, when the amount of the ultraviolet absorber is 0.1 part by weight or more, in particular, the effect of further improving the weather resistance of the aromatic polycarbonate resin composition is large.

In the aromatic polycarbonate resin composition of the embodiment of the present invention, an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C) and a specific aromatic compound (D) are mixed, and if necessary, polyether The method of mixing a derivative (E), an epoxy compound (F), the above various additives, and a polymer other than the aromatic polycarbonate resin (A) and the like can be exemplified. As long as the aromatic polycarbonate resin composition aimed at by the present invention can be obtained, the production method thereof is not particularly limited, and the type and amount of each component can be appropriately adjusted. 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, or 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 or mixed to a fatty acid ester (C) or a polyether derivative (E) in advance.

The shape and size of the pellet of the aromatic polycarbonate resin composition obtained as described above are not particularly limited, and may be any shape and size of the general resin pellet. For example, as a shape of a pellet, an elliptical column shape, a column shape, etc. are mentioned. As the size of the pellets, it is suitable that the length is about 2 to 8 mm, and in the case of an elliptical column shape, it is preferable that the major diameter of the short side ellipse is about 2 to 8 mm and the short diameter is about 1 to 4 mm. It is suitable that the diameter of the cross-section circle is about 1 to 6 mm. On the other hand, each of the obtained pellets may have such a size, or all pellets forming the pellet aggregate may have such a size, and the average value of the pellet aggregate may have such a size, and is not particularly limited.

The molded article for optics of the embodiment of the present invention can be obtained by molding the above aromatic polycarbonate resin composition.

As long as the optical molded article of the present invention can be obtained, the method for producing the optical molded article is not particularly limited, and for example, a method of molding the aromatic polycarbonate resin composition by a known injection molding method, compression molding method, or the like. Can be lifted.

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

As described above, the embodiment has been described as an example of the present invention. However, the technology in the present invention is not limited to this, and can be applied to embodiments in which modifications, substitutions, omissions, and the like are appropriately performed.

[Example]

The present invention will be specifically described by way of Examples below, but the present invention is not limited to these Examples. On the other hand, unless otherwise specified, "parts" and "%" are each on a weight basis.

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 Polycar" are registered trademarks of Sumika Polycarbonate Co., Ltd., hereinafter referred to as "PC" or (A1). .

2. Phosphorus antioxidant (B):

2-1. Tris(2,4-di-t-butylphenyl)phosphite represented by the following formula

[The monolithic force 168 (trade name) manufactured by BASF, hereinafter also referred to as (B1)]

2-2. Bis(2,4-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite represented by the following formula (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 (brand name) made by ADEKA, also referred to as (B2) below]

3. Fatty acid ester (C):

Glycerin monostearate

Rickemal S-100A

(Product name, manufactured by Riken Vitamin Co., hereinafter referred to as ``GM'' or (C1))

4. Aromatic Compound (D):

3,5-di-t-butyl-4-hydroxytoluene

[Wako Junyaku Industrial Co., Ltd., hereinafter referred to as (D1)]

5. Polyether derivative (E):

5-1. Modified glycol composed of tetramethylene glycol unit and propylene glycol unit (random copolymerization)

Weight average molecular weight: 2000, polyserine DCB-2000 (trade name) manufactured by Nichiyu Co., Ltd., hereinafter also referred to as (E1).

5-2. Modified glycol composed of ethylene glycol unit and propylene glycol unit (random copolymerization)

Weight average molecular weight: 1750, UniLube 50DE-25 (trade name) manufactured by Nichiyu Co., Ltd., hereinafter referred to as (E2).

5-3. Polytetramethylene glycol

Weight average molecular weight: 1000, PTG-1000SN (trade name) manufactured by Hodogaya Chemical Industries, Ltd., hereinafter also referred to as (E3)

6. Epoxy compound (F)

3',4'-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate

[Celloxide 2021P (trade name) manufactured by Daicel Chemical Co., Ltd., hereinafter also referred to as (F1)]

(Examples 1 to 11 and Comparative Examples 1 to 5)

Each of the above raw materials was put into a tumbler at a ratio shown in Tables 1 to 2, and dry-mixed for 10 minutes, and then, using a twin-screw extruder (Nippon Steel Co., Ltd., TEX30α), at a melting temperature of 220°C. The melt-kneading was performed to obtain pellets of each of the aromatic polycarbonate resin compositions of Examples 1 to 11 and Comparative Examples 1 to 5.

On the other hand, the pellets obtained in Examples and Comparative Examples are almost elliptical, and the aggregates consisting of 100 pellets each have an average length of about 5.1 mm to about 5.4 mm, and an average value of the major diameter of the cross-section ellipse is about 4.1 mm to about 4.3 mm. , The average value of the short diameter was about 2.2 mm to about 2.3 mm.

Using the obtained pellets, each test piece for evaluation was produced and provided for evaluation according to the following method. The results are shown in Tables 1 to 2.

(How to make a test piece)

After drying the obtained pellet at 120°C for 4 hours or more, using an injection molding machine (manufactured by Fanak Co., Ltd., ROBOSHOT S2000i100A), at a molding temperature of 280°C and a mold temperature of 80°C, specified in JIS K 7139 ``Plastic-test piece'' A multipurpose test piece A (length 168 mm×thickness 4 mm) was produced. The end face of this test piece was cut, and the cut end surface was mirror-finished using a resin plate cross-section mirror (manufactured by Megarotechnica Co., Ltd., Plasticity PB-500).

(Evaluation method of integrated transmittance)

A long light path measurement accessory was installed on a spectrophotometer (Hitachi Co., Ltd., UH4150), and a 50W halogen lamp was used as a light source, and the mask before light source was 5.6mm×2.8mm and the mask before sample was 6.0mm×2.8mm. In the state of use, the spectral transmittance of each test piece for every 1 nm in the region of wavelength 380 to 780 nm was measured with respect to the full length direction of the test piece. Each integrated transmittance was determined by integrating the measured spectral transmittance and rounding the tens digit. On the other hand, the cumulative transmittance of 32000 or more was good (in the table, indicated by ◎), less than 32000 or more, 30000 or more can be used (in the table, indicated by ○), and less than 30000 was regarded as bad (in the table, indicated by ×).

(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 field of view using a standard light source D65. On the other hand, YI of 12 or less was good (in the table, indicated by ◎), more than 12 and 13 or less can be used (in the table, indicated by ○), and when it exceeds 13, it was regarded as defective (in the table, indicated by ×).

(Evaluation of heating test for molded products)

The test piece produced above was installed in an inner oven IPHH-201M manufactured by SPECK, and subjected to a heating test at 200°C for 72 hours.

Next, the surface of each test piece was visually observed. According to the following criteria, the state after the heating test was evaluated. The results are shown in Tables 1 to 3.

◎: Colorless and transparent.

○: Transparent and usable, but slightly colored.

X: There is an opaque or dark coloring.

In Tables 1 to 2, raw materials and blending ratios of each of Examples and Comparative Examples and evaluation results are also shown.

The aromatic polycarbonate resin composition of Examples 1-11 contains the aromatic polycarbonate resin (A), phosphorus antioxidant (B), fatty acid ester (C), and a specific aromatic compound (D), and polyether as needed. The derivative (E) and the epoxy compound (F) are each contained in a specific ratio. Therefore, the test piece molded from the aromatic polycarbonate resin composition has a high integrated transmittance, a small yellowness, and little deterioration after the heating test.

In addition, the molded article formed by molding such an aromatic polycarbonate resin composition has excellent yellow color and excellent color, and there is little deterioration after the heating test.

On the other hand, the molded article obtained by molding the aromatic polycarbonate resin compositions of Comparative Examples 1 to 5 was inferior in at least one of luminance, color, and results after the heating test.

As described above, the embodiment has been described as an example of the technology in the present invention. Provided a detailed description for him.

Therefore, among the components described in the detailed description, not only essential components for solving the problem, but also components not necessary for solving the problem may be included in order to exemplify the technology. For that reason, those non-essential components are described in the detailed description, and immediately, it is not to be admitted that non-essential components are essential.

In addition, since the above-described embodiment is for exemplifying the technology in the present invention, various changes, substitutions, additions, omissions, and the like can be made in the claims or equivalent ranges thereof.

The aromatic polycarbonate resin composition of the present invention does not impair properties such as heat resistance and mechanical strength inherent to the polycarbonate resin, has excellent thermal stability and weather resistance, and further contains the aromatic polycarbonate resin composition of the present invention. Even when the molded article 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 a thin light guide light source having a thickness of about 0.3 mm to the surface of the light guide plate, the color of the resulting light guide plate is not changed, and the appearance and optical properties are not reduced. The industrial use value is extremely high.

Claims (16)

An aromatic polycarbonate resin composition comprising an aromatic polycarbonate resin (A), a phosphorus antioxidant (B), a fatty acid ester (C), and an aromatic compound (D) represented by the following formula, wherein the aromatic polycarbonate resin (A) is 100 wt. Aromatic, characterized in that it contains 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 0.0001 parts by weight or more and less than 0.05 parts by weight of aromatic compound (D) with respect to parts. Polycarbonate resin composition.
expression:

According to claim 1,
An aromatic polycarbonate resin composition, wherein the phosphorus-based antioxidant (B) contains a phosphorous acid ester compound having the following phosphorous acid ester structure.

According to claim 1,
The aromatic polycarbonate resin composition, wherein the phosphorus antioxidant (B) contains at least one compound selected from phosphorous acid ester compounds represented by the following formulas (1) and (2).
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 represent integers 0 to 3] The method of claim 3,
An aromatic polycarbonate resin composition satisfying at least one selected from the following.
The phosphorous acid ester compound represented by the formula (1) contains tris(2,4-di-t-butylphenyl)phosphite; And
The phosphorous acid ester compound represented by the formula (2) is 3,9-bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9- Diphospha spiro [5,5] containing undecane. The method of claim 3 or 4,
The phosphorus-based antioxidant (B) includes at least a compound represented by the formula (1), and the amount of the compound represented by the formula (1) is 20 to 100% by mass of the total amount of the phosphorus-based antioxidant (B), Aromatic polycarbonate resin composition. The method of claim 3 or 4,
The phosphorus-based antioxidant (B) includes at least two compounds, and at least one of the at least two compounds is a compound represented by formula (1), and the amount of the compound represented by formula (1) is phosphorus-based oxidation The aromatic polycarbonate resin composition which is 20-90 mass% of the total amount of inhibitor (B). The method according to any one of claims 1 to 6,
The fatty acid ester (C), an aromatic polycarbonate resin composition containing a condensation compound of an aliphatic carboxylic acid and an alcohol. The method of claim 7,
The fatty acid ester (C) is an aromatic polycarbonate resin composition comprising an ester of 6 to 36 carbon atoms, an aliphatic monocarboxylic acid and an aliphatic dicarboxylic acid, and an aliphatic saturated monohydric alcohol and an aliphatic saturated polyhydric alcohol having 30 or less carbon atoms. The method of claim 8,
The fatty acid ester (C) is glycerin monostearate, aromatic polycarbonate resin composition. The method according to any one of claims 1 to 9,
With respect to 100 parts by weight of the aromatic polycarbonate resin (A), 0.1 parts by weight or more and 2.0 parts by weight of the polyether derivative (E) having a weight average molecular weight of 500 to 8000 represented by the following formula (5) , Aromatic polycarbonate resin composition.
Equation (5):
RO-(XO)m(YO)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 straight chain alkylene group having 2 to 4 carbon atoms or branched alkylene group, and Y is a straight chain alkyl having 2 to 5 carbon atoms. It represents a alkylene group or 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 method according to any one of claims 1 to 10,
The aromatic polycarbonate resin composition further contains 0.001 to 0.2 parts by mass of the epoxy compound (F) with respect to 100 parts by weight of the aromatic polycarbonate resin (A). The method of claim 11,
Aromatic polycarbonate resin composition, wherein the epoxy compound (F) contains 3',4'-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate. The method according to any one of claims 1 to 12,
An aromatic polycarbonate resin composition further containing at least one member selected from the group containing a heat stabilizer, antioxidant, colorant, mold release agent, softener, antistatic agent and impact modifier. A molded article for optics containing the aromatic polycarbonate resin composition according to any one of claims 1 to 13. The method of claim 14,
A molded article for optics, wherein the molded article for optics contains a molded article selected from a light guide film, a vehicle light guide, and a name plate. A method for producing a molded article for optics, comprising molding the aromatic polycarbonate resin composition according to any one of claims 1 to 13.