CN111630108B

CN111630108B - Aromatic polycarbonate resin composition and optical molded article

Info

Publication number: CN111630108B
Application number: CN201980009426.4A
Authority: CN
Inventors: 长尾厚史; 永野圭哉; 榊阳一郎; 加藤善彦
Original assignee: Sumika Polycarbonate Ltd
Current assignee: Sumika Polycarbonate Ltd
Priority date: 2018-01-26
Filing date: 2019-01-24
Publication date: 2022-12-27
Anticipated expiration: 2039-01-24
Also published as: JP2020125438A; TWI785194B; KR20200105950A; KR102577972B1; WO2019146693A1; TW201936782A; CN111630108A; JPWO2019146693A1; JP2021088712A; JP6894585B2; JP7026682B2

Abstract

Disclosed is an aromatic polycarbonate resin composition comprising an aromatic polycarbonate resin (A), a polyester derivative (B) and a specific aromatic compound (C), wherein the aromatic polycarbonate resin composition comprises the polyester derivative (B) in an amount of 0.1-2.0 parts by weight and the aromatic compound (C) in an amount of 0.0001 to 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 optical molded article

Technical Field

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

Background

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

For example, patent document 1 discloses an aromatic polycarbonate resin composition for a light guide plate, which is prepared by blending an aromatic polycarbonate resin having a specific molecular weight and a specific molecular weight distribution with a stabilizer and a release agent.

Patent document 2 discloses a polycarbonate resin composition for optical molded articles, which comprises a polycarbonate resin and a fluorescent whitening agent blended therein, wherein the resin component comprises a specific amount of a bead-like crosslinked acrylic resin having a specific diameter.

In addition, for example, as disclosed in patent documents 3 to 6, various resin compositions using a polycarbonate resin and another material in combination have been proposed for obtaining excellent light transmittance and improving the brightness of an optical member.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open No. 2007-204737

Patent document 2: japanese laid-open patent publication No. H09-020860

Patent document 3: japanese patent laid-open publication No. 2011-133647

Patent document 4: japanese patent laid-open publication No. H11-158364

Patent document 5: japanese patent laid-open No. 2001-215336

Patent document 6: japanese laid-open patent publication No. 2004-051700

Disclosure of Invention

Problems to be solved by the invention

However, the polycarbonate resin compositions disclosed in patent documents 3 to 6 do not sufficiently satisfy the recent requirements as materials for light guide plates (in particular, there is no reduction in light transmittance even when molding is performed at high temperatures for thin-wall molding).

In recent years, there has been a growing demand for a material which is less susceptible to deterioration in transparency (less cloudiness or coloration) even when a thin molded article (for example, a light guide plate) of about 0.3mm obtained by molding is exposed to a high temperature condition caused by light irradiation or the like for an extremely long period of time.

An object of the present invention is to provide an aromatic polycarbonate resin composition which has excellent thermal stability and high light transmittance without impairing the properties such as heat resistance and mechanical strength inherent in polycarbonate resins, and which is hardly deteriorated in transparency (hardly causes cloudiness or coloration) even when a thin molded article (for example, a light guide plate) of about 0.3mm obtained by molding is exposed to a high temperature due to light irradiation or the like for an extremely long period of time.

Means for solving the problems

The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that an aromatic polycarbonate resin composition comprising an aromatic polycarbonate resin (a), a polyether derivative (B) and a specific aromatic compound (C) in predetermined amounts is excellent in thermal stability and high in light transmittance without impairing the properties such as heat resistance and mechanical strength inherent in polycarbonate resins, and that a thin molded article (for example, a light guide plate) of about 0.3mm obtained by molding is less likely to suffer from deterioration in transparency (is less likely to cause cloudiness or coloration) even when exposed to high-temperature conditions caused by light source irradiation or the like for a long period of time, and have completed the present invention.

That is, the present invention provides an aromatic polycarbonate resin composition comprising an aromatic polycarbonate resin (a), a polyether derivative (B), and an aromatic compound (C) represented by the following formula, wherein the aromatic polycarbonate resin composition comprises the polyether derivative (B) in an amount of 0.1 to 2.0 parts by weight and the aromatic compound (C) in an amount of 0.0001 to less than 0.05 part by weight, based on 100 parts by weight of the aromatic polycarbonate resin (a), and an optical molded article obtained by molding the aromatic polycarbonate resin composition.

Formula (II):

[ chemical formula 1]

Effects of the invention

The polycarbonate resin composition of the present invention is excellent in thermal stability and high in light transmittance without impairing the properties inherent in polycarbonate resins, such as heat resistance and mechanical strength, and the obtained molded article is less likely to be deteriorated in transparency (less likely to be clouded or colored) even when exposed to high temperature conditions caused by a burning sun environment and/or light irradiation for a long period of time. Therefore, even a thin molded article (light guide plate) having a thickness of, for example, about 0.3mm is not likely to suffer from a change in hue and deterioration (degradation) in appearance, and is not likely to suffer from a reduction in transparency (is not likely to suffer from cloudiness or coloration) even when exposed to a high temperature condition caused by an external environment or a light source for a long time, and is extremely high in industrial utilization value.

Detailed Description

The embodiments are described in detail below. However, the above detailed description may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description becoming unnecessarily lengthy and readily understandable to those skilled in the art.

The present inventors have provided the following description to fully understand the present invention by those skilled in the art, and do not intend to limit the subject matter described in the scope of claims by these descriptions.

The aromatic polycarbonate resin composition according to the embodiment of the present invention comprises an aromatic polycarbonate resin (a), a polyether derivative (B), and a specific aromatic compound (C), and may contain a phosphorus antioxidant (D), an epoxy compound (E), and/or other components, if necessary.

In the embodiment of the present invention, the "aromatic polycarbonate resin (a)" is not particularly limited as long as it is a polycarbonate resin based on an aromatic compound and can obtain an aromatic polycarbonate resin composition targeted by the present invention. Examples of the aromatic polycarbonate resin include various polymers obtained by a phosgene method in which a dihydroxy diaryl compound is reacted with phosgene, or a transesterification method in which a dihydroxy diaryl compound is reacted with a carbonic acid ester such as diphenyl carbonate. Representative examples include polycarbonate resins made from 2, 2-bis (4-hydroxyphenyl) propane (bisphenol A).

Examples of the dihydroxy diaryl compound include, in addition to bisphenol a: bis (4-hydroxyphenyl) methane, 1-bis (4-hydroxyphenyl) ethane, 2-bis (4-hydroxyphenyl) butane, and 2, 2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2-bis (4-hydroxyphenyl-3-methylphenyl) propane bis (hydroxyaryl) alkanes such as 1, 1-bis (4-hydroxy-3-tert-butylphenyl) propane, 2-bis (4-hydroxy-3-bromophenyl) propane, 2-bis (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; dihydroxy diaryl sulfides such as 4,4' -dihydroxy diphenyl 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. They may be used alone or in combination. In addition to these, piperazine, dipiperidinohydroquinone, resorcinol, 4' -dihydroxybiphenyl, and the like may be used in combination.

Further, the dihydroxy diaryl compound may be used in combination with an aromatic compound having a valence of 3 or more, for example, as shown below.

Examples of the above-mentioned phenol compound having a valence of 3 or more include: phloroglucinol, 4, 6-dimethyl-2, 4, 6-tris- (4-hydroxyphenyl) -heptene, 2,4, 6-dimethyl-2, 4, 6-tris- (4-hydroxyphenyl) -heptane, 1,3, 5-tris- (4-hydroxyphenyl) -benzene, 1-tris- (4-hydroxyphenyl) -ethane, and 2, 2-bis- [4,4- (4, 4' -dihydroxydiphenyl) -cyclohexyl ] -propane, and the like.

The viscosity average molecular weight of the aromatic polycarbonate resin (A) is preferably 10000 to 100000, more preferably 12000 to 30000. When producing the aromatic polycarbonate resin (a), a molecular weight modifier, a catalyst, or the like may be used as necessary.

In the embodiment of the present invention, the polyether derivative (B) is not particularly limited as long as it is a derivative of a polyether compound and the aromatic polycarbonate resin composition targeted by the present invention can be obtained. Such a polyether derivative includes, as a representative example, a polyether derivative represented by the following formula (1).

Formula (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 represents a linear or branched alkylene group having 2 to 4 carbon atoms, Y represents a linear or branched alkylene group having 2 to 5 carbon atoms, X and Y may be the same or different, and m and n each independently represents 3 to 60, and m + n represents 6 to 120.)

The weight average molecular weight of the polyether derivative represented by formula (1) is preferably 500 to 8000, more preferably 1000 to 4000.

The polyether derivative represented by the formula (1) may be a commercially available product.

The polyether derivative represented by the formula (1) may be

The following formula (1-1):

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 represents a linear alkylene group having 2 to 4 carbon atoms, Y represents a branched alkylene group having 2 to 5 carbon atoms, and m and n each independently represent 3 to 60, and m + n represents 8 to 90.)

The polyether derivative shown.

The weight average molecular weight of the polyether derivative represented by the formula (1-1) is preferably 500 to 8000, more preferably 1000 to 4000.

The polyether derivative represented by the formula (1-1) may be any commercially available one.

The polyether derivative represented by the formula (1) may be

The following formula (1-2):

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 represents a linear alkylene group having 2 to 4 carbon atoms, Y represents a linear 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 100.)

The polyether derivative shown.

The weight average molecular weight of the polyether derivative represented by the formula (1-2) is preferably 500 to 8000, more preferably 1000 to 4000.

The polyether derivative represented by the formula (1-2) may be any commercially available one.

The polyether derivative represented by the formula (1) may be

The following formula (1-3):

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 branched alkylene group having 2 to 4 carbon atoms, Y represents 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 polyether derivative shown.

The weight average molecular weight of the polyether derivative represented by the formula (1-3) is preferably 500 to 8000, more preferably 1000 to 4000.

The polyether derivatives represented by the formula (1-3) may be commercially available ones.

The polyether derivative represented by the formula (1) preferably contains at least 1 selected from the group consisting of a polyether derivative represented by the following formula (2), a polyether derivative represented by the formula (3), a polyether derivative represented by the formula (4), a polyether derivative represented by the formula (5), a polyether derivative represented by the formula (6), a polyether derivative represented by the formula (7), a polyether derivative represented by the formula (8), a polyether derivative represented by the formula (9), and a polyether derivative represented by the formula (10).

The polyether derivative represented by the formula (1-1) preferably contains at least 1 selected from the group consisting of a polyether derivative represented by the following formula (2), a polyether derivative represented by the formula (3), a polyether derivative represented by the formula (4), a polyether derivative represented by the formula (5), and a polyether derivative represented by the formula (6).

The polyether derivative represented by the formula (1-2) preferably contains at least 1 selected from the polyether derivative represented by the formula (7) and the polyether derivative represented by the formula (8).

The polyether derivative represented by the formula (1-3) preferably contains at least 1 selected from the polyether derivative represented by the formula (9) and the polyether derivative represented by the formula (10).

Formula (2):

HO－(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)n－H

(wherein m and n each independently represent 3-60, m + n represents 8-90.)

The polyether derivative represented by formula (2) is preferably a modified diol containing a tetramethylene glycol unit and a propylene glycol unit. As such a polyether derivative, commercially available products can be used, and examples thereof include Polyserine DCB-1000 (weight average molecular weight 1000), polyserine DCB-2000 (weight average molecular weight 2000), polyserine DCB-4000 (weight average molecular weight 4000) and the like manufactured by Nichiya Kogyo Co., ltd.

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

Formula (3):

HO－(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH ₂ CH(CH ₃ )CH ₂ O)n－H

(wherein m and n each independently represent 3-60, m + n represents 8-90.)

The polyether derivative represented by formula (3) is preferably a modified diol containing a tetramethylene glycol unit and a 2-methyltetramethylene glycol unit. As such a polyether derivative, commercially available products can be used, and for example, PTG-L1000 (weight average molecular weight 1000), PTG-L2000 (weight average molecular weight 2000), PTG-L3000 (weight average molecular weight 3000) and the like manufactured by Gekko Gum chemical industry, ltd.

The weight average molecular weight of the polyether derivative represented by formula (3) is preferably 500 to 8000, more preferably 1000 to 4000.

Formula (4):

HO－(CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)n－H

(in the formula, m and n each independently represent 3-60, m + n represents 8-90.)

The polyether derivative represented by the formula (4) is preferably a modified diol containing ethylene glycol units and propylene glycol units. As such a polyether derivative, commercially available products can be used, and examples thereof include Unilube50 DE-25 (weight average molecular weight 1750) and Unilube 75DE-25 (weight average molecular weight 1400) manufactured by Nichida oil Co., ltd.

The weight average molecular weight of the polyether derivative represented by formula (4) is preferably 500 to 8000, more preferably 1000 to 4000.

Formula (5):

RO－(CH ₂ CH ₂ 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 represent 3 to 60, and m + n represents 8 to 90.)

The polyether derivative represented by formula (5) is preferably a modified diol containing a tetramethylene glycol unit and a propylene glycol unit and having a butyl group at one end or a stearyl group at one end. As such a polyether derivative, commercially available products can be used, and examples thereof include Polyserine BC-1000 (having a butyl group at one end and a weight average molecular weight of 1000) and Polyserine SC-1000 (having a stearyl group at one end and a weight average molecular weight of 1000) manufactured by Nichiya oil Co., ltd.

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

Formula (6):

RO－(CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)n－H

The polyether derivative represented by formula (6) is preferably a modified diol which contains ethylene glycol units and propylene glycol units and has a butyl group at one end or a stearyl group at one end. As such a polyether derivative, commercially available products can be used, and examples thereof include Unilube50 MB-11 (one end is a butyl group and the weight average molecular weight is 1000), unilube50MB-26 (one end is a butyl group and the weight average molecular weight is 2000), unilube50 MB-72 (one end is a butyl group and the weight average molecular weight is 3000), unilube 10MS-250KB (one end is a stearyl group and the weight average molecular weight is 2000) manufactured by Nichiya Kogyo Co., ltd.

The weight average molecular weight of the polyether derivative represented by formula (6) is preferably 500 to 8000, more preferably 1000 to 4000.

Formula (7):

HO－(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH ₂ O)n－H

The polyether derivative represented by the formula (7) is preferably a modified diol containing tetramethylene glycol units and ethylene glycol units. As such a polyether derivative, commercially available products can be used, and examples thereof include Polyserine DC3000E (weight average molecular weight 3000) and Polyserine DC1800E (weight average molecular weight 1800) manufactured by Nichiya oil Co., ltd.

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

Formula (8):

HO－(CH ₂ CH ₂ CH ₂ CH ₂ O)p－H

(wherein p represents 6 to 100.)

The polyether derivative represented by the formula (8) is preferably polytetramethylene glycol. As such a polyether derivative, commercially available products can be used, and for example, PTG-650SN (weight average molecular weight 650), PTG-850SN (weight average molecular weight 850), PTG-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 manufactured by Sakuwa chemical industry, ltd.

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

Formula (9):

formula (II): HO- (CH) ₃ )CH ₂ O)q－H

(wherein q represents 7 to 120.)

The polyether derivative represented by formula (9) is preferably polypropylene glycol. As such a polyether derivative, commercially available products can be used, and examples thereof include Polyglycol P2000P (weight average molecular weight 2000) manufactured by Dow chemical, 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) manufactured by Nichiki Kasei corporation.

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

Formula (10):

HO－(CH(C ₂ H ₅ )CH ₂ O)r－H

(wherein r represents 6 to 100.)

The polyether derivative represented by the formula (10) is preferably polytetramethylene glycol. As such a polyether derivative, commercially available products can be used, and examples thereof include Uniol PB-500 (weight average molecular weight 500), uniol PB-1000 (weight average molecular weight 1000), and Uniol PB-2000 (weight average molecular weight 2000) manufactured by Nichisu oil Co., ltd.

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

The polyether derivative represented by the general formula (1) has high heat resistance as a whole, and a molded article obtained by molding an aromatic polycarbonate resin composition containing the polyether derivative at high temperature has high brightness and high light transmittance.

The polyether derivatives represented by the above formulae (1) to (10) may contain a repeating unit other than the repeating units described in the formulae, as long as the aromatic polycarbonate resin composition and the optical molded article targeted by the present invention can be obtained. Examples of such a repeating unit include: a repeating unit based on impurities which may be contained in the starting material of the polyether derivative, a repeating unit based on an initiator (polymerization initiator) used at the time of polymerization, and the like.

When a polymerization initiator is used, the following compounds can be exemplified as the polymerization initiator. Examples thereof include hydrogenated bisphenol A, isosorbide, glycerin, pentaerythritol, sorbitol, and glucose.

As such a polyether derivative containing a repeating unit derived from a polymerization initiator, there can be exemplified Polyserine 60DB-2000H (manufactured by Nichikoku corporation) (see formula 2-2) which corresponds to the above formula (2).

Formula (2-2):

[ chemical formula 2]

(wherein m1+ m2 corresponds to m of formula (2) and n1+ n2 corresponds to n of formula (2))

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

Further, the polyether derivative (B) used in the present invention has appropriate lipophilicity and therefore has excellent compatibility with the aromatic polycarbonate resin (a), and therefore, the transparency of a molded article obtained from an aromatic polycarbonate resin composition containing the polyether derivative (B) is not lowered and the transparency can be maintained. The weight average molecular weight of the polyether derivative (B) is preferably 500 to 8000, more preferably 1000 to 4000.

The CPR (unit: dimensionless) (Controlled Polymerization Rate: an index showing the amount of basic substances in the polyether derivative, measured in accordance with JIS K1557-4) of the polyether derivative (B) used in the present invention is preferably 2.0 or less, more preferably 1.0 or less. When the CPR is 2.0 or less, the polyether derivative (B) has excellent compatibility with the polycarbonate resin, is suppressed in decomposition and deterioration, has excellent storage stability, and is less likely to adversely affect the hue of the obtained polycarbonate resin composition. For example, the CPR of Polyserine DCB-2000 corresponding to polyether derivative (B) represented by formula (2) is less than 1.0, the CPR of Polyserine 60DB-2000H (manufactured by Nichiya oil Co., ltd.) corresponding to polyether derivative (B) represented by formula (2) is less than 1.0, and the CPR of PTG-1000SN (manufactured by Sagittaria chemical industry Co., ltd.) corresponding to polyether derivative (B) represented by formula (8) is less than 1.0.

The polyether derivative (B) used in the present invention preferably has a pH (measured according to JIS K1557-5) of 5.0 or more and less than 7.5, more preferably 6.0 or more and less than 7.0. When the pH of the polyether derivative (B) is 5.0 or more and less than 7.5, decomposition and deterioration are suppressed, the storage stability is excellent, and the bad influence on the hue of the obtained polycarbonate resin composition is not easily caused. For example, the pH of Polyserine DCB-2000 corresponding to the polyether derivative (B) represented by the above formula (2) was 6.7, the pH of Polyserine 60DB-2000H (manufactured by Nichiya oil Co., ltd.) corresponding to the polyether derivative (B) represented by the above formula (2) was 6.8, and the pH of PTG-1000SN (manufactured by Saoku chemical industry Co., ltd.) corresponding to the polyether derivative (B) represented by the above formula (8) was 6.7.

The temperature at which 90% by weight of the polyether derivative (B) used in the present invention (or the temperature at which the weight loss rate is 10%) is measured by thermogravimetry according to JIS K7120 is preferably 300 ℃ or more, and more preferably 330 ℃ or more. When the temperature at which the polyether derivative (B) becomes 90% by weight is 300 ℃ or more, decomposition and deterioration are suppressed, the storage stability is excellent, and the hue of the obtained polycarbonate resin composition is not easily affected. For example, the temperature corresponding to 90% by weight of the Polyserine DCB-2000 of the polyether derivative (B) represented by the above formula (2) is 330 ℃ and the temperature corresponding to 90% by weight of the Polyserine 60DB-2000H (manufactured by Nichiou oil Co., ltd.) of the polyether derivative (B) represented by the above formula (2) is 400 ℃.

The amount of the polyether derivative is 0.1 to 2.0 parts by weight, preferably 0.3 to 1.8 parts by weight, based on 100 parts by weight of the aromatic polycarbonate resin (A). When the amount of the polyether derivative is less than 0.1 part by weight, the effect of improving the light transmittance and the hue may be insufficient. In contrast, in the case where the amount of the polyether derivative is more than 2.0 parts by weight, the fogging rate may increase and the light transmittance may decrease.

The aromatic polycarbonate resin composition according to the embodiment of the present invention contains a polyether derivative (B) and an aromatic compound (C) represented by the following formula as essential components. By using the polyether derivative (B) and the aromatic compound (C) in combination as described above, it is possible to prevent deterioration such as deterioration due to the use state of a molded article comprising the obtained aromatic polycarbonate resin composition, aging deterioration, and the like while maintaining excellent optical characteristics required for an optical molded article.

For example, it is possible to effectively prevent thermal deterioration (cloudiness or coloration) of an optical molded article molded from the aromatic polycarbonate resin composition due to long-term illumination with a light source (such as an LED light source). When an optical molded article is subjected to severe conditions such as sun exposure and/or is continuously irradiated with light for a long time, the temperature of the surface of the molded article may increase, and thermal degradation of the aromatic polycarbonate resin (a) contained in the aromatic polycarbonate resin composition may progress. Further, the polyether derivative (B) in the resin composition may be modified to impair the transparency (brightness or light transmittance) expected for an aromatic polycarbonate resin composition used in a general optical molded article, and the surface of the molded article may be clouded or colored (light to dark).

The present inventors have conducted intensive studies in view of the above problems, and as a result, have completed the present invention with attention paid to the following ideas: the specific aromatic compound (C) of the following formula is particularly effective as a compound for suppressing deterioration such as modification of the polyether derivative (B), and by adding the specific aromatic compound (C) to the polyether derivative (B) in advance or adding the specific aromatic compound (C) before melt-kneading for obtaining the aromatic polycarbonate resin composition, deterioration of the polyether derivative (B) in a molded article can be suppressed to reduce or alleviate the phenomenon of cloudiness or coloring (light to dark coloring).

Formula (II):

[ chemical formula 3]

The amount of the aromatic compound (C) used in the embodiment of the present invention is 0.0001 to less than 0.05 part by weight, preferably 0.0005 to 0.003 part by weight, based on 100 parts by weight of the aromatic polycarbonate resin (a). When the amount of the aromatic compound (C) is less than 0.0001 part by weight, the effect of suppressing cloudiness or coloring is insufficient. On the other hand, when the amount of the aromatic compound (C) is 0.05 parts by weight or more, high levels of light transmittance and hue required for the optical molded article may not be achieved, which is not desirable.

The aromatic polycarbonate resin composition according to the embodiment of the present invention may further contain a phosphorus antioxidant (D). As described above, when the aromatic polycarbonate resin composition contains the polyether derivative (B), the specific aromatic compound (C) and the phosphorus antioxidant (D) in combination, it is possible to prevent deterioration such as deterioration due to the use state and deterioration due to aging, without deteriorating the initial optical properties of a molded article containing the obtained aromatic polycarbonate resin composition in particular, while maintaining the improvement in the excellent optical properties required for an optical molded article.

The phosphorus-based antioxidant is not particularly limited as long as the aromatic polycarbonate resin composition targeted by the present invention can be obtained, but preferably contains a phosphite ester compound having the following phosphite ester structure.

[ chemical formula 4]

In the aromatic polycarbonate resin composition according to the embodiment of the present invention, the phosphorus antioxidant (D) preferably contains at least 1 or more compounds selected from the group consisting of a phosphite ester compound represented by the following formula (11), a phosphite ester compound represented by the following formula (12), a phosphite ester compound represented by the following formula (13) and a phosphite ester compound represented by the following formula (14).

The phosphorus-based antioxidant (D) preferably contains a compound represented by the following formula (11), for example.

Formula (11):

[ chemical formula 5]

(in the formula, R ¹ Represents an alkyl group having 1 to 20 carbon atoms, and a representsAn integer of 0 to 3)

In the above formula (11), R ¹ An alkyl group having 1 to 20 carbon atoms is preferable, and an alkyl group having 1 to 10 carbon atoms is more preferable.

Examples of the compound represented by the formula (11) include: triphenyl phosphite, tricresyl phosphite, tris (2, 4-di-t-butylphenyl) phosphite, trisnonylphenyl phosphite, and the like. Among them, tris (2, 4-di-t-butylphenyl) phosphite is particularly preferable, and is commercially available, for example, in the form of Irgafos 168 (Irgafos, a registered trademark of BASF Societas Europaea) manufactured by BASF corporation.

The phosphorus-based antioxidant (D) preferably contains a compound represented by the following formula (12), for example.

Formula (12):

[ chemical formula 6]

(in the formula, 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, an alkylcycloalkyl group having 6 to 12 carbon atoms, 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 an alkylene group having 1 to 8 carbon atoms or formula: * -COR ⁸ - (herein, 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 an alkyl group having 1 to 8 carbon atoms. )

In the formula (12), 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, an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group.

Here, examples of the alkyl group having 1 to 8 carbon atoms include: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-pentyl, isooctyl, tert-octyl, 2-ethylhexyl, and the like. Examples of the cycloalkyl group having 5 to 8 carbon atoms include: cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, and the like. Examples of the alkylcycloalkyl group having 6 to 12 carbon atoms include: 1-methylcyclopentyl, 1-methylcyclohexyl, 1-methyl-4-isopropylcyclohexyl, and the like. Examples of the aralkyl group having 7 to 12 carbon atoms include: benzyl, α -methylbenzyl, α -dimethylbenzyl, and the like.

R is as defined above ² 、R ³ And R ⁵ Each independently is preferably 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 Each independently of the other, a tertiary alkyl group such as a tert-butyl group, a tert-amyl group or a tert-octyl group, a cyclohexyl group or a 1-methylcyclohexyl group is preferred. In particular, R ³ An alkyl group having 1 to 5 carbon atoms such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, or a tert-pentyl group is preferable, and a methyl group, a tert-butyl group, or a tert-pentyl group is more preferable.

R is as defined above ⁶ The alkyl group 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 more preferably an alkyl group having 1 to 5 carbon atoms such as a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, or a tert-pentyl group.

In the formula (12), 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 those mentioned above for R ² 、R ³ 、R ⁵ And R ⁶ The alkyl group exemplified in the description of (1). In particular, R ⁴ 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 (12), X represents a single bond, a sulfur atom or a formula: -CHR ⁷ -a group as shown. Here, the formula: -CHR ⁷ R in (A-C) ⁷ Represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms. The alkyl group having 1 to 8 carbon atoms and the cycloalkyl group having 5 to 8 carbon atoms may be, for example, eachAre exemplified in the above R ² 、R ³ 、R ⁵ And R ⁶ Alkyl and cycloalkyl groups exemplified in the description of (1). In particular, X is preferably a single bond, a methylene group, or a methylene group substituted with a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, or the like, and more preferably a single bond.

In the formula (12), A represents an alkylene group having 1 to 8 carbon atoms or a formula: * -COR ⁸ -a group as shown. Examples of the alkylene group having 1 to 8 carbon atoms include: methylene, ethylene, propylene, butylene, pentamethylene, hexamethylene, octamethylene, 2-dimethyl-1, 3-propylene and the like, preferably propylene. In addition, the formula: * -COR ⁸ R in (a-C) ⁸ Represents a single bond or an alkylene group having 1 to 8 carbon atoms. As a representation of R ⁸ Examples of the alkylene group having 1 to 8 carbon atoms include the alkylene groups exemplified in the description of A. R ⁸ Preferably a single bond or ethylene. In addition, the formula: * -COR ⁸ -is a bond on the oxygen side, meaning that the carbonyl group is bonded to the oxygen atom of the phosphite group.

In the formula (12), 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 an alkyl group having 1 to 8 carbon atoms. Examples of the alkoxy group having 1 to 8 carbon atoms include: methoxy, ethoxy, propoxy, tert-butoxy, pentoxy and the like. Examples of the aralkyloxy group having 7 to 12 carbon atoms include: benzyloxy, α -methylbenzyloxy, α -dimethylbenzyloxy, and the like. Examples of the alkyl group having 1 to 8 carbon atoms include those mentioned above for R ² 、R ³ 、R ⁵ And R ⁶ The alkyl group exemplified in the description of (1).

Examples of the compound represented by the formula (12) include: 2,4,8,10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy ] dibenzo [ d, f ] [1,3,2] dioxaphosphepin, 6- [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propoxy ] -2,4,8,10-tetra-tert-butylbenzo [ d, f ] [1,3,2] dioxaphosphepin, 6- [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propoxy ] -4, 8-di-tert-butyl-2, 10-dimethyl-12H-dibenzo [ d, g ] [1,3,2] dioxaphosphepin, 6- [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyloxy ] -4, 8-di-tert-butyl-2, 10-dimethyl-12H-dibenzo [ d, g ] [1,3,2] dioxaphosphepin, and the like. Among them, in particular, in the case of using the obtained aromatic polycarbonate resin composition in the field where optical characteristics are required, 2,4,8,10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy ] dibenzo [ d, f ] [1,3,2] dioxaphosphepin is preferable, and for example, it can be commercially obtained in the form of Sumilizer GP ("Sumilizer" is a registered trademark) manufactured by sumitomo chemical corporation.

The phosphorus-based antioxidant (D) preferably contains a compound represented by the following formula (13), for example.

Formula (13):

[ chemical formula 7]

(in the formula, R ⁹ And R ¹⁰ Each independently represents an alkyl group having 1 to 20 carbon atoms or an aryl group optionally substituted with an alkyl group, and b and c each independently represent an integer of 0 to 3. )

Examples of the compound represented by formula (13) include: bis (2, 4-di-t-butylphenyl) pentaerythritol diphosphite, phenyl bisphenol A pentaerythritol diphosphite, and the like. Bis (2, 4-di-t-butylphenyl) pentaerythritol diphosphite is commercially available under the product name "ADK STAB PEP-24G" manufactured by the company ADEKA. Commercially available as ADK STAB PEP-36 (ADK STAB is a registered trademark) manufactured by ADEKA corporation.

The phosphorus-based antioxidant (D) preferably contains a compound represented by the following formula (14), for example.

Formula (14):

[ chemical formula 8]

(wherein R is ¹¹ ～R ¹⁸ Each independently represents 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 Optionally bonded to each other to form a ring. R ¹⁹ ～R ²² Each independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms. d to g are each independently an integer of 0 to 5. X ¹ ～X ⁴ Each independently represents a single bond or a carbon atom. X ¹ ～X ⁴ In the case of a single bond, R is excluded from the general formula (14) ¹¹ ～R ²² A functional group attached to the single bond. )

Specific examples of the compound represented by the formula (14) include bis (2, 4-dicumylphenyl) pentaerythritol diphosphite. It is commercially available under the trade name "Doverphos (registered trade name) S-9228" manufactured by Dover Chemical company and under the trade name "ADK STAB PEP-45" (bis (2, 4-dicumylphenyl) pentaerythritol diphosphite) manufactured by ADEKA company.

The above aromatic polycarbonate resin composition preferably satisfies at least 1 selected from the following cases:

the phosphite ester compound represented by the above formula (11) comprises tris (2, 4-di-t-butylphenyl) phosphite;

the phosphite ester compound represented by the above formula (12) comprises 2,4,8, 10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy ] dibenzo [ d, f ] [1,3,2] dioxaphosphepin;

the phosphite ester compound represented by the above formula (13) comprises 3, 9-bis (2, 6-di-t-butyl-4-methylphenoxy) -2,4,8, 10-tetraoxa-3, 9-diphosphaspiro [5,5] undecane; and

the phosphite compound represented by the above formula (14) comprises bis (2, 4-dicumylphenyl) pentaerythritol diphosphite.

The amount of the phosphorus antioxidant (D) is preferably 0.5 parts by weight or less, more preferably 0.02 to 0.2 parts by weight, based on 100 parts by weight of the aromatic polycarbonate resin (A).

In addition to the above components, in the aromatic polycarbonate resin composition of the embodiment, for example, an ultraviolet absorber which is a component for further improving the weather resistance of the obtained aromatic polycarbonate resin composition can be suitably used according to the use of a molded article obtained by molding the aromatic polycarbonate resin composition.

As the ultraviolet absorber, for example, ultraviolet absorbers generally blended in polycarbonate resins such as benzotriazole compounds, triazine compounds, benzophenone compounds, and oxalic anilide compounds can be used alone or in combination of 2 or more kinds thereof.

Examples of the benzotriazole-based compound include: 2- (2-hydroxy-5-tert-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-benzotriazol-2-yl) -4-methyl-6- (3, 4,5, 6-tetrahydrophthalimidomethyl) phenol, 2- (2-hydroxy-4-octyloxyphenyl) -2H-benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) -2H-benzotriazole, 2- [2 '-hydroxy-3, 5-bis (1, 1-dimethylbenzyl) phenyl ] -2H-benzotriazole, 2' -methylenebis [6- (2H-benzotriazol-2-yl) 4- (1, 3-tetramethylbutyl) phenol ], and the like. Among them, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole and the like are particularly preferable, and for example, TINUVIN 329 (TINUVIN is a registered trademark) manufactured by BASF corporation, seesorb 709 manufactured by Shipro chemical corporation, kemisorb P79 manufactured by Chemipro chemical corporation and the like are commercially available.

Examples of the triazine compound include: 2, 4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3, 5-triazine, 2- [4, 6-bis (2, 4-dimethylphenyl) -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 corporation, and the like are commercially available.

Examples of the oxalanilide compound include sanduvo VSU manufactured by clariant japan (ltd.) and the like, which are commercially available.

Examples of the benzophenone-based compound include: 2, 4-dihydroxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, and the like.

The amount of the ultraviolet absorber is 0 to 1.0 part by weight, 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 is more than 1.0 part by weight, the initial hue of the obtained aromatic polycarbonate resin composition may be lowered. 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 effectively exhibited.

The aromatic polycarbonate resin composition according to the embodiment of the present invention may contain an epoxy compound (E). As described above, when the aromatic polycarbonate resin composition contains the polyether derivative (B), the specific aromatic compound (C) and the epoxy compound (E) together, it is possible to prevent deterioration such as deterioration due to the use state and deterioration due to aging without deteriorating the initial optical characteristics of a molded article containing the obtained aromatic polycarbonate resin composition while maintaining the improvement in excellent optical characteristics required for an optical molded article.

The epoxy compound (E) is not particularly limited as long as it has at least 1 epoxy group in the molecule and can give the aromatic polycarbonate resin composition targeted by the present invention. The epoxy compound (E) may include, for example, 3, 4-epoxycyclohexanecarboxylic acid 3',4' -epoxycyclohexylmethyl ester, epoxidized soybean oil, epsilon-caprolactone-modified 3, 4-epoxycyclohexanecarboxylic acid 3',4' -epoxycyclohexylmethyl ester, epoxy group-containing acrylic/styrenic polymer, 2-bis (4-hydroxycyclohexyl) propane-diglycidyl ether, and the like. The epoxy compound (E) preferably comprises 3, 4-epoxycyclohexanecarboxylic acid 3',4' -epoxycyclohexylmethyl ester.

The aromatic polycarbonate resin composition of the embodiment of the present invention preferably contains the epoxy compound (E) in an amount of 0.001 to 0.2 parts by mass, more preferably 0.002 to 0.1 parts by mass, and particularly preferably 0.005 to 0.05 parts by mass, based on 100 parts by mass of the aromatic polycarbonate resin (a).

When the aromatic polycarbonate resin composition according to the embodiment of the present invention contains 0.001 to 0.2 part by mass of the epoxy compound (E) per 100 parts by mass of the aromatic polycarbonate resin (a), the initial optical properties (the integrated transmittance and the yellowness) of a molded article containing the obtained aromatic polycarbonate resin composition can be improved while maintaining the improvement in the excellent optical properties required for the optical molded article, and the deterioration such as deterioration or aged deterioration due to the use state can be prevented.

In the aromatic polycarbonate resin composition of the embodiment, various additives such as a heat stabilizer, other antioxidant, colorant, mold release agent, softener, antistatic agent, impact modifier, and the like, and polymers other than the aromatic polycarbonate resin (a) may be appropriately blended within a range not to impair the effects of the present invention.

The aromatic polycarbonate resin composition according to the embodiment of the present invention may be produced by mixing the aromatic polycarbonate resin (a), the polyether derivative (B) and the specific aromatic compound (C), and if necessary, mixing the phosphorus antioxidant (D), the epoxy compound (E), the various additives, and a polymer other than the aromatic polycarbonate resin (a). The production method is not particularly limited as long as the aromatic polycarbonate resin composition targeted by the present invention can be obtained, and the kinds and amounts of the respective components may be appropriately adjusted. The method of mixing the components is not particularly limited, and examples thereof include a method of mixing by a known mixer such as a tumbler and a ribbon blender, and a method of melt-kneading by an extruder. By these methods, pellets of the aromatic polycarbonate resin composition can be easily obtained. The specific aromatic compound (C) may be mixed before melt-kneading, or may be added to or mixed with the polyether derivative (B) in advance.

The shape and size of the pellets of the aromatic polycarbonate resin composition obtained as described above are not particularly limited, and may be those of general resin pellets. For example, the shape of the pellet includes: elliptical cylinder, cylindrical, etc. The size of the pellet is preferably about 2 to 8mm in length, and in the case of an elliptic cylinder, the major diameter of the sectional ellipse is preferably about 2 to 8mm, and the minor diameter is preferably about 1 to 4mm, and in the case of a cylindrical shape, the diameter of the sectional circle is preferably about 1 to 6 mm. The size of each of the obtained pellets may be 1 pellet, the size of all the pellets forming the pellet aggregate may be the same, or the average value of the pellet aggregates may be the same, and is not particularly limited.

The optical molded article according to the 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 targeted by the present invention can be obtained, and examples thereof include a method of molding an aromatic polycarbonate resin composition by a known injection molding method, compression molding method, or the like.

The optical molded article of the present invention is suitable for use as a light guide plate, a surface light emitting material, a light guide film, a light guide for a vehicle, a sign, or 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 be applied to an embodiment in which modifications, substitutions, additions, omissions, and the like are appropriately made.

Examples

The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, "part" and "%" are based on weight, respectively.

As the raw material, the following materials were used.

1. Aromatic polycarbonate resin (a):

polycarbonate resin synthesized from bisphenol A and phosgene

Viscosity average molecular weight: 15000 SD POLYCA200-80 (trade name) manufactured by Sunghua Polycarbonate, inc. ("SD POLYCA") is a registered trademark of Sunghua Polycarbonate, hereinafter also referred to as "PC" or (A1)

2. Polyether derivative (B):

2-1. modified diol comprising tetramethylene glycol units and propylene glycol units (random copolymerization)

Weight average molecular weight: 2000, pH:6.7 (JIS K1557-5) Polyserine DCB-2000 (trade name) manufactured by Nichisu oil Co., ltd., hereinafter also referred to as (B1)

2-2. Modified diol comprising tetramethylene glycol units and propylene glycol units (random copolymerization)

Weight average molecular weight: 1000, pH:6.8 (JIS K1557-5) Polyserine DCB-1000 (trade name) manufactured by Nichisu oil Co., ltd., hereinafter also referred to as (B2)

2-3. Modified diols comprising tetramethylene glycol units and ethylene glycol units (random copolymerization)

Weight average molecular weight: 3000 Polyserine DC-3000E (trade name) manufactured by Nichiya oil Co., ltd., hereinafter also referred to as (B3)

2-4. Modified diol comprising tetramethylene glycol units and propylene glycol units, one end of which is butyl (random copolymerization)

Weight average molecular weight: 1000 Polyserine BC-1000 (trade name) manufactured by Nichiya oil Co., ltd., hereinafter also referred to as (B4)

2-5. Modified diols comprising ethylene glycol units and propylene glycol units (random copolymerization)

Weight average molecular weight: 1750 Unilube50 DE-25 (trade name) manufactured by Nichida oil Co., ltd., hereinafter referred to as (B5)

2-6. Modified diol comprising ethylene glycol units and propylene glycol units and having a butyl group at one end (random copolymerization)

Weight average molecular weight: 2000, unilube50MB-26 (trade name) manufactured by Nichioji oil Co., ltd, hereinafter also referred to as (B6)

2-7. Polypropylene glycol

Weight average molecular weight: 2000, polyglycol P2000P (trade name) manufactured by Dow chemical, hereinafter also referred to as (B7)

2-8. Polytetramethylene glycol

Weight average molecular weight: 1000 PTG-1000SN manufactured by Baotai chemical industry Co., ltd. (trade name), hereinafter also referred to as (B8)

2-9. Modified diols comprising tetramethylene glycol units and 2-methyltetramethylene glycol units (random copolymerization)

Weight average molecular weight: 2000, PTG-L2000 (trade name) manufactured by Baotu chemical industry Co., ltd., hereinafter also referred to as (B9)

3. Aromatic compound (C):

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

[ manufactured by Wako pure chemical industries, ltd., hereinafter also referred to as "C1 ]

4. Phosphorus antioxidant (D):

4-1. tris (2, 4-di-tert-butylphenyl) phosphite of the formula

[ chemical formula 9]

Irgafos 168 (trade name) manufactured by BASF corporation, hereinafter also referred to as (D1)

4-2. 2,4,8,10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy ] dibenzo [ d, f ] [1,3,2] dioxaphosphepin diene of the formula

[ chemical formula 10]

[ Sumilizer GP (trade name) manufactured by Sumitomo chemical Co., ltd., hereinafter also referred to as "D2" ]

4-3. Bis (2, 4-dicumylphenyl) pentaerythritol diphosphite (IUPAC name: 3, 9-bis [2, 4-bis (. Alpha.,. Alpha. -dimethylbenzyl) phenoxy ] -2,4,8, 10-tetraoxa-3, 9-diphosphaspiro [5.5] undecane) represented by the following formula

[ chemical formula 11]

[ Doverphos S-9228 (trade name) manufactured by Dover Chemical Co., ltd., hereinafter also referred to as "D3" ]

4-4. 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) of the formula

[ chemical formula 12]

[ ADK STAB PEP-36 (trade name) manufactured by ADEKA, hereinafter also referred to as "D4" ]

5. Epoxy compound (E)

3, 4-Epoxycyclohexanecarboxylic acid 3',4' -epoxycyclohexylmethyl ester

Celloxide 2021P (trade name) manufactured by Daicel chemical industry, hereinafter also referred to as "E1" ]

(examples 1 to 33 and comparative examples 1 and 2)

The above raw materials were charged into a tumbler at the ratios shown in tables 1 to 4, and dry-mixed for 10 minutes, and then melt-kneaded at a melting temperature of 220 ℃ using a twin-screw extruder (TEX 30 α, manufactured by japan steel corporation) to obtain pellets of the aromatic polycarbonate resin compositions of examples 1 to 33 and comparative examples 1 and 2.

In example 7, the compound (C) and the compound (B) were previously mixed and then mixed with other raw materials to obtain pellets of the aromatic polycarbonate resin composition of example 7.

The pellets obtained in examples and comparative examples were each substantially in the shape of an elliptical cylinder, and the average length of each aggregate including 100 pellets was about 5.1mm to about 5.4mm, the average major diameter of the cross-sectional ellipse was about 4.1mm to about 4.3mm, and the average minor diameter was about 2.2mm to about 2.3mm.

Using the obtained pellets, test pieces for evaluation were produced by the following methods and subjected to evaluation. The results are shown in tables 1 to 4.

(method for producing test piece)

The obtained pellets were dried at 120 ℃ for 4 hours or more, and then a multifunctional test piece type A (168 mm in total length. Times.4 mm in thickness) specified in JIS K71399 "Plastic test piece" was prepared at a molding temperature of 360 ℃ and a mold temperature of 80 ℃ using an injection molding machine (ROBOSHOT S2000i100A, manufactured by Fanuc corporation). The end face of the test piece was cut, and the cut end face was mirror-finished using a resin plate end face mirror machine (PLA-BEAUTY PB-500 manufactured by MEGARO TECHNICA Co., ltd.).

(method of evaluating cumulative transmittance)

A long-optical-path measurement fixture was installed in a spectrophotometer (UH 4150, manufactured by Hitachi, ltd.) and the spectral transmittance of each test piece at a wavelength of 380 to 780nm was measured over the entire length of the test piece using a 50W halogen lamp as a light source and a photomask of 5.6mm × 2.8mm and a photomask of 6.0mm × 2.8mm for the sample. The measured spectral transmittances were integrated, and the integrated transmittances were obtained by rounding off tens. The cumulative transmittance was good at 31000 or more (expressed as "excellent" in the table), acceptable at less than 31000 and at 25000 or more (expressed as "o" in the table), and poor at less than 25000 (expressed as "x" in the table).

(method of evaluating yellowness index)

Based on the spectral transmittance measured in the cumulative transmittance evaluation method, the yellowness (hereinafter referred to as YI) of each was determined in a field of view of 10 degrees using a standard light source D65. In addition, YI is set to be good at 15 or less (indicated as ∈ in the table), usable at more than 15 and 30 or less (indicated as ≈ in the table), and defective at more than 30 (indicated as × in the table).

(evaluation of molded article in heating test)

The test piece prepared in the above was placed in an inert oven IPHH-201M manufactured by ESPEC, and subjected to a heating test at 200 ℃ for 72 hours.

Next, the surface of each test piece was visually observed. The state after the heat test was evaluated according to the following criteria. The results are shown in tables 1 to 4.

Very good: is colorless and transparent.

O: transparent, workable, but slightly colored.

X: opaque or there is a dark coloration.

Tables 1 to 4 show the raw materials, the mixing ratios, and the evaluation results of the examples and comparative examples.

[ Table 1]

a) The method comprises the following steps Mixing the (C1) and the (B1) and then mixing with other raw materials.

[ Table 2]

[ Table 3]

b) The method comprises the following steps White turbidity occurred.

c) The method comprises the following steps No test was performed.

[ Table 4]

The aromatic polycarbonate resin compositions of examples 1 to 33 comprise an aromatic polycarbonate resin (a), a polyether derivative (B) and a specific aromatic compound (C), and if necessary, a phosphorus antioxidant (D) and the like in specific proportions. Therefore, the test piece obtained by molding the aromatic polycarbonate resin composition has a high cumulative transmittance and a small yellowness, and is hardly deteriorated even after the heat test.

Further, a molded article obtained by molding such an aromatic polycarbonate resin composition has a small yellowness, is excellent in hue, and is hardly deteriorated even after a heat test.

In contrast, the aromatic polycarbonate resin compositions of comparative examples 1 and 2 had a large amount of the polyether derivative (compound B1), and therefore had a low cumulative transmittance and a large yellow index. Thus, the molded article obtained by molding the aromatic polycarbonate resin composition of comparative example 1 had poor brightness and hue. Also, the results after the heat test were also not good.

As described above, the embodiments have been described as an example of the technique of the present invention. A detailed description is provided for this purpose.

Therefore, the components described in the detailed description include not only components necessary for solving the problem but also components unnecessary for solving the problem for exemplifying the above-described technology. Therefore, these non-essential components should not be described in the detailed description, but should be directly identified as essential.

Further, the above-described embodiments are intended to exemplify the technique of the present invention, and various modifications, substitutions, additions, omissions, and the like can be made within the scope of the claims and the equivalent thereof.

Industrial applicability

The aromatic polycarbonate resin composition of the present invention is excellent in thermal stability and weather resistance without impairing the properties such as heat resistance and mechanical strength inherent in polycarbonate resins, and is excellent in appearance and optical properties even when a molded article comprising the aromatic polycarbonate resin composition of the present invention is heated. Therefore, even when the light guide plate is used for such applications as a continuous heating state by long-term irradiation onto the surface of the light guide plate of a thin light guide light source having a thickness of about 0.3mm, the obtained light guide plate does not change in hue, does not deteriorate in appearance and optical characteristics, and has an extremely high industrial utility value.

RELATED APPLICATIONS

Note that the present application claims priority based on application numbers 2018-11641 proposed in japan on 26 th of year 1 of 2018 and application numbers 2018-156195 proposed in japan on 23 th of year 8 of 2018 according to article 4 of the paris convention. The contents of these prior applications are incorporated by reference into this specification.

Claims

1. An aromatic polycarbonate resin composition comprising an aromatic polycarbonate resin A, a polyether derivative B and an aromatic compound C represented by the following formula,

comprising 0.1 to 2.0 parts by weight of a polyether derivative B and 0.0001 to 0.003 part by weight of an aromatic compound C, based on 100 parts by weight of an aromatic polycarbonate resin A,

formula (II):

2. the aromatic polycarbonate resin composition of claim 1, wherein said polyether derivative B comprises a polyether derivative represented by the following formula (1) having a weight average molecular weight of 500 to 8000,

formula (1):

RO－(X－O)m(Y－O)n－R’

in formula (1), R and R' 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 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 independently represent 3 to 60, m + n represents 6 to 120.

3. The aromatic polycarbonate resin composition according to claim 2, wherein the polyether derivative represented by formula (1) comprises at least 1 selected from the group consisting of a polyether derivative represented by formula (2), a polyether derivative represented by formula (3), a polyether derivative represented by formula (4), a polyether derivative represented by formula (5), a polyether derivative represented by formula (6), a polyether derivative represented by formula (7), a polyether derivative represented by formula (8), a polyether derivative represented by formula (9) and a polyether derivative represented by formula (10),

formula (2):

HO－(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)n－H

in formula (2), m and n independently represent 3-60, and m + n represents 8-90;

formula (3):

HO－(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH ₂ CH(CH ₃ )CH ₂ O)n－H

in formula (3), m and n independently represent 3-60, and m + n represents 8-90;

formula (4):

HO－(CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)n－H

in formula (4), m and n each independently represent 3-60, m + n represents 8-90;

formula (5):

RO－(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)n－H

in formula (5), R represents an alkyl group having 1 to 30 carbon atoms, m and n each independently represent 3 to 60, m + n represents 8 to 90;

formula (6):

RO－(CH ₂ CH ₂ O)m(CH(CH ₃ )CH ₂ O)n－H

in formula (6), R represents alkyl with 1-30 carbon atoms, m and n each independently represent 3-60, m + n represents 8-90;

formula (7):

HO－(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH ₂ O)n－H

in formula (7), m and n independently represent 3-60, and m + n represents 8-90;

formula (8):

HO－(CH ₂ CH ₂ CH ₂ CH ₂ O)p－H

in the formula (8), p represents 6 to 100;

formula (9):

HO－(CH(CH ₃ )CH ₂ O)q－H

in the formula (9), q represents 7 to 120;

and

formula (10):

HO－(CH(C ₂ H ₅ )CH ₂ O)r－H

in the formula (10), r is 6 to 100.

4. The aromatic polycarbonate resin composition according to any one of claims 1 to 3, wherein the CPR of polyether derivative B measured according to JIS K1557-4 is 2.0 or less.

5. The aromatic polycarbonate resin composition according to any one of claims 1 to 3, wherein the polyether derivative B has a pH of 5.0 or more and less than 7.5 as measured in accordance with JIS K1557-5.

6. The aromatic polycarbonate resin composition according to any one of claims 1 to 3, wherein the temperature at which the polyether derivative B becomes 90% by weight or the temperature at which the weight loss rate becomes 10% as measured by thermogravimetric measurement according to JIS K7120 is 300 ℃ or more.

7. The aromatic polycarbonate resin composition according to any one of claims 1 to 3, wherein the aromatic compound C is contained in an amount of 0.0005 part by weight or more and 0.003 part by weight or less based on 100 parts by weight of the aromatic polycarbonate resin A.

8. The aromatic polycarbonate resin composition according to any one of claims 1 to 3, which further comprises 0.5 part by weight or less of a phosphorus antioxidant D per 100 parts by weight of the aromatic polycarbonate resin A.

9. The aromatic polycarbonate resin composition according to claim 8, wherein said phosphorus antioxidant D comprises a phosphite compound having a phosphite structure,

10. the aromatic polycarbonate resin composition according to claim 9, wherein the phosphorus antioxidant D comprises at least 1 or more compound selected from phosphite ester compounds represented by the following formulae (11), (12), (13) and (14),

formula (11):

in the formula (11), 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 (12):

in the formula (12), 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, an alkylcycloalkyl group having 6 to 12 carbon atoms, 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, and X represents a single bond, a sulfur atom or a formula: -CHR ⁷ -a group represented by, herein, 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 an alkylene group having 1 to 8 carbon atoms or formula: * -COR ⁸ -a group represented by, herein, R ⁸ Represents a single bond or an alkylene group having 1 to 8 carbon atoms, 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 an alkyl group having 1 to 8 carbon atoms;

formula (13):

in the formula (13), R ⁹ 、R ¹⁰ Represents an alkyl group having 1 to 20 carbon atoms or an aryl group optionally substituted with an alkyl group, and b and c each independently represent an integer of 0 to 3;

formula (14):

in the formula (14), R ¹¹ ～R ¹⁸ Each independently represents 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 Optionally bonded to each other to form a ring, R ¹⁹ ～R ²² Each independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, d to g each independently represents an integer of 0 to 5, X ¹ ～X ⁴ Each independently represents a single bond or a carbon atom, X ¹ ～X ⁴ In the case of a single bond, R is excluded from formula (14) ¹¹ ～R ²² To the single bond.

11. The aromatic polycarbonate resin composition according to claim 10, which satisfies at least 1 selected from the following cases:

the phosphite compound represented by formula (11) comprises tris (2, 4-di-tert-butylphenyl) phosphite;

the phosphite ester compound represented by formula (12) comprises 2,4,8, 10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy ] dibenzo [ d, f ] [1,3,2] dioxaphosphepin;

the phosphite ester compound represented by the formula (13) comprises 3, 9-bis (2, 6-di-tert-butyl-4-methylphenoxy) -2,4,8, 10-tetraoxa-3, 9-diphosphaspiro [5,5] undecane; and

the phosphite compound represented by formula (14) comprises bis (2, 4-dicumylphenyl) pentaerythritol diphosphite.

12. The aromatic polycarbonate resin composition according to any one of claims 1 to 3, which further comprises 0.001 to 0.2 parts by weight of an epoxy compound E per 100 parts by weight of the aromatic polycarbonate resin A.

13. The aromatic polycarbonate resin composition of claim 12, wherein said epoxy compound E comprises 3, 4-epoxycyclohexanecarboxylic acid 3',4' -epoxycyclohexylmethyl ester.

14. The aromatic polycarbonate resin composition according to any one of claims 1 to 3, further comprising at least 1 selected from a heat stabilizer, an antioxidant, a colorant, a mold release agent, a softener, an antistatic agent and an impact modifier.

15. An optical molded article comprising the aromatic polycarbonate resin composition according to any one of claims 1 to 14.

16. The optical molded article according to claim 15, wherein the optical molded article comprises a molded article selected from a light guide plate, a surface light emitting material, a light guide film, a light guide for a vehicle, and a sign.

17. A method for producing an optical molded article, which comprises molding the aromatic polycarbonate resin composition according to any one of claims 1 to 14.

18. A pellet of the aromatic polycarbonate resin composition according to any one of claims 1 to 14.

19. The pellet of claim 18, which is used to obtain an optical molded article.

20. A process for producing an optical molded article, which comprises molding the pellet as defined in claim 19.