TW202116918A - Polycarbonate resin composition - Google Patents

Abstract

A polycarbonate resin composition comprising 0.1 to 10 parts by mass of a polycarbonate copolymer (B) having carbonate bonding between (B1) bisphenol A and (B2) poly-n-propylene glycol which may have a substituent, and 0.005 to 0.5 parts by mass of a phosphorus stabilizer (C), relative to 100 parts by mass of a polycarbonate resin (A).

Description

Polycarbonate resin composition

The present invention relates to a polycarbonate resin composition. Specifically, it relates to a polycarbonate resin composition that has excellent impact resistance, a good hue, and is excellent in transparency, and has minimal gas generation and mold contamination during molding. It is a molded product obtained by molding it.

In order to meet the requirements of thinner, lighter, labor-saving, and high-definition liquid crystal display devices used in personal computers, mobile phones, etc., surface light source devices are incorporated. In order to guide the incident light to the light liquid crystal display side uniformly and efficiently, the planar light source device is provided with a light guide plate with a wedge-shaped cross section and a flat light guide plate with the same inclined surface on one side. And some will form uneven patterns on the surface of the light guide plate to give light scattering function.

Such a light guide plate is obtained by injection molding of a thermoplastic resin, and the above-mentioned concave-convex pattern is imparted by the transfer of the concave-convex portion formed on the surface of the overmold. In the past, light guide plates were molded from resin materials such as polymethyl methacrylate (PMMA), but recently there is a demand for display devices that can map clearer images. Heat generated near the light source may cause problems in the equipment. Due to the tendency of high temperature, it is gradually replaced with polycarbonate resin material with higher heat resistance.

Polycarbonate resin has excellent mechanical properties, thermal properties, electrical properties, and weather resistance, but its light transmittance is lower than that of PMMA. Therefore, when a light guide plate made of polycarbonate resin and a light source form a surface light source body, There will be a problem of low brightness. Recently, it is required that the chromaticity difference between the light incident part of the light guide plate and the place far from the light incident part be small, but polycarbonate resin has the problem that it is more prone to yellowing than PMMA.

Patent Document 1 proposes a method to improve light transmittance and brightness by adding acrylic resin and alicyclic epoxy compound. Patent Document 2 proposes to modify the end of polycarbonate resin and make the light guide plate better As a method for improving the transferability of the uneven portion and making the brightness better, Patent Document 3 proposes a method for introducing a copolyester carbonate having an aliphatic segment to improve the transferability, thereby making the brightness better.

However, the method of Patent Document 1, because the addition of acrylic resin can make the hue good, but the light transmittance and brightness cannot be improved due to the white turbidity, the transmittance can be improved by adding an alicyclic epoxy compound, but the improvement of the hue cannot be confirmed effect. Patent Document 2 and Patent Document 3 are expected to improve fluidity and transferability, but they have the disadvantage of lowering heat resistance.

On the other hand, it is known that polyethylene glycol or poly(2-methyl)ethylene glycol is blended with thermoplastic resins such as polycarbonate resins. Patent Document 4 describes a polycarbonate containing it that is resistant to γ-ray irradiation. As an ester resin, Patent Document 5 describes a thermoplastic resin composition blended with PMMA or the like that has excellent antistatic properties and excellent surface appearance. In addition, Patent Document 6 proposes to improve transmittance and hue by blending polyalkylene glycol composed of linear alkyl groups. By blending polytetramethylene ether glycol, it was observed that the transmittance and the degree of yellowing (yellow index: YI) were improved. In addition, Patent Document 7 describes a method for producing a polycarbonate copolymer using a diol obtained by diesterizing a polyalkylene glycol as a raw material (comonomer). However, in this polycarbonate copolymer, The diester diol of polyalkylene glycol is unstable, has insufficient impact resistance, and is unsatisfactory in hue and heat discoloration resistance.

Especially in various portable terminals such as smart phones and tablet terminals, the thinning and large-scale optical parts such as light guide plates have been rapidly and remarkably progressed. The forming of light guide plates requires high barrel temperature and high-speed injection. Along with this, there is an increase in gas generated during molding, and there is a problem that the mold is easily contaminated. Therefore, the resin composition used in such molding needs not only excellent optical properties, but also less mold contamination caused by gas generation during high-temperature injection molding, and excellent impact resistance. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Laid-Open No. 11-158364 [Patent Document 2] Japanese Patent Application Publication No. 2001-208917 [Patent Document 3] Japanese Patent Application Publication No. 2001-215336 [Patent Document 4] Japanese Patent Laid-Open No. 1-22959 [Patent Document 5] Japanese Patent Application Laid-Open No. 9-227785 [Patent Document 6] Japanese Patent No. 5699188 [Patent Document 7] JP 2006-016497 A

(Problems to be solved by the invention)

In view of the foregoing, the present invention aims to provide a polycarbonate resin composition that has a good hue, excellent transparency, excellent impact resistance, and minimal gas generation during molding and mold contamination. (The way to solve the problem)

In order to achieve the above-mentioned problem, the inventors of the present invention made diligent research and found that: a specific polycarbonate made by using carbonate bonds by blending bisphenol A and poly-n-propylene glycol in a common polycarbonate resin at the same time in a specific amount The ester copolymer and the phosphorus stabilizer can obtain a polycarbonate resin composition with excellent impact resistance, good hue, excellent transparency, and minimal gas generation and mold contamination during molding. This completes the present invention. The present invention relates to the following polycarbonate resin compositions and molded products.

[1] A polycarbonate resin composition characterized by containing: 0.1-10 parts by mass of polycarbonate copolymer (B) based on 100 parts by mass of polycarbonate resin (A), and containing (B1) bisphenol A and (B2) may have substituent poly-n-propylene glycol formed by carbonate bond; and phosphorus stabilizer (C) 0.005 to 0.5 parts by mass. [2] The polycarbonate resin composition as in [1], the initial YI value of 300mm optical path length is 25 or less, the difference between the YI value of 300mm optical path length and the initial YI value after being kept at 95°C for 1000 hours (ΔYI) is 6 or less. [3] The polycarbonate resin composition according to [1] or [2], wherein the weight average molecular weight (Mw) of (B2) poly-n-propylene glycol constituting the polycarbonate copolymer (B) is 600-8000. [4] The polycarbonate resin composition according to any one of [1] to [3], wherein the weight average molecular weight (Mw) of the polycarbonate copolymer (B) is 5,000 to 40,000. [5] The polycarbonate resin composition of [1] to [4], wherein the mass ratio of (B1) bisphenol A and (B2) poly-n-propylene glycol constituting the polycarbonate copolymer (B) is ( The total of B1) and (B2) is based on 100% by mass. (B1) is 5% by mass or more and less than 50% by mass, and (B2) is more than 50% by mass and 95% by mass or less. [6] The polycarbonate resin composition according to any one of [1] to [5], wherein the notched Charpy impact strength of a molded article with a thickness of 3 mm according to ISO 179 is 25 kJ/m ² or more. [7] A molded product, which is a molded product of the polycarbonate resin composition of any one of [1] to [6]. [8] Molded products such as [7] are optical parts. [9] A polycarbonate resin composition characterized by containing 0.001 to 0.5 parts by mass of a stabilizer relative to 100 parts by mass of the polycarbonate resin (A), and having an initial YI value of 25 at an optical path length of 300 mm Hereinafter, the difference (ΔYI) between the YI value of the 300mm optical path length and the initial YI value after being kept at 95°C for 1000 hours is 6 or less. [10] The polycarbonate resin composition according to [9], wherein the stabilizer is a phosphorus stabilizer. [11] The polycarbonate resin composition of [9] or [10], wherein the notched Charpy impact strength of a molded article with a thickness of 3 mm according to ISO 179 is 25 kJ/m ² or more. (Effects of the invention)

The polycarbonate resin composition of the present invention has excellent impact resistance, good hue, excellent transparency, and minimal gas generation and mold contamination during molding. The molded product thus obtained has excellent impact resistance and is particularly suitable as Optical parts with good hue and transparency. In particular, the polycarbonate copolymer (B) of the present invention using (B2) poly-n-propylene glycol is compared to a copolymer obtained by replacing the same linear polytetramethylene glycol with polycarbonate resin ( A) has high compatibility and excellent transparency. In practical terms, the ratio that can be mixed with the polycarbonate copolymer (B) can be high, or a higher molecular weight polycarbonate copolymer (B) can be used. Therefore, It has a wide range of resin designs for various applications.

Hereinafter, the present invention will be described in detail with embodiments and exemplified materials. In addition, in this specification, "~", unless otherwise specified, is used with the meaning including the numerical value described before and after it as the lower limit and the upper limit.

The polycarbonate resin composition of the present invention is characterized in that: relative to 100 parts by mass of the polycarbonate resin (A), it contains 0.1-10 parts by mass of (B1) bisphenol A and (B2) which may also have substituents. Poly-n-propylene glycol is a polycarbonate copolymer (B) formed by a carbonate bond, and 0.005 to 0.5 parts by mass of a phosphorus stabilizer (C). Hereinafter, the components, optical parts, etc. constituting the polycarbonate resin composition of the present invention will be described in detail.

[Polycarbonate copolymer (B) formed from (B1) bisphenol A and (B2) poly-n-propylene glycol using carbonate linkages] The polycarbonate copolymer (B) used in the present invention is a polycarbonate copolymer formed from (B1) bisphenol A and (B2) poly-n-propylene glycol, which may also have substituents, using carbonate bonds.

The mass ratio of (B1) bisphenol A and (B2) poly-n-propylene glycol constituting the polycarbonate copolymer (B), based on the total of (B1) and (B2) 100% by mass, is preferably (B1) bisphenol A is 5 mass% or more and less than 50 mass%, (B2) poly-n-propylene glycol is more than 50 mass% and 95 mass% or less, preferably (B1) 5 mass% or more and 40 mass% or less, (B2) 60% by mass or more and 95% by mass or less, more preferably (B1) 5% by mass or more and 35% by mass or less, and (B2) 65% by mass or more and 95% by mass or less. (B2) When the poly-n-propylene glycol content is 50% by mass or less, the hue of the polycarbonate resin composition deteriorates, and when it exceeds 95% by mass, it tends to become cloudy.

式中，R_a ～R_f 各自獨立地表示氫原子或碳數1～3之烷基。m、n、l表示整數。The polycarbonate copolymer (B) is represented by the following general formula (1), and is a polycarbonate copolymer composed of polycarbonate units derived from bisphenol A and polycarbonate units derived from poly-n-propylene glycol. [化1]

In the formula, R _a to R _f each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. m, n, and l represent integers.

The polycarbonate copolymer (B) can be produced by conventional production methods such as interfacial polymerization and melt polymerization. For example, it can be produced by at least (B1) bisphenol A, (B2) poly-n-propylene glycol, phosgene, and two carbonic acid. It is produced by reacting phenyl ester and other carbonate precursors.

Regarding the poly-n-propylene glycol (B2) that may also have substituents, various poly-n-propylene glycols can be used, for example: the following general formula (2) may also have substituted poly-n-propylene glycols as a preferred example .

式中，R_a ～R_f 各自獨立地表示氫原子、碳數1～3之烷基，n表示6～600之整數。 就聚正丙二醇(B2)而言，宜為上述通式(2)中，R_b 係甲基且Ra、Rc、Rd、Re、Rf為氫之聚(2-甲基)正丙二醇、R_b 改為乙基之聚(2-乙基)正丙二醇、Rb、Re為甲基且Ra、Rc、Rd、Rf為氫之聚(2,2-二甲基)正丙二醇較理想，其中R_a ～R_f 皆為氫原子之聚正丙二醇(亦即聚丙二醇)又更佳。 本說明書中，聚正丙二醇有時記載為聚丙二醇，兩者係同義，係指同一化合物。[化2]

Wherein, R _a ~ R _f each independently represent a hydrogen atom, an alkyl group having 1 to 3 carbon atoms of, n-represents an integer of from 6 to 600. In terms of poly-n-propylene (B2), should the general formula (2), R _b and methyl-based Ra, Rc, Rd, Re, Rf is hydrogen of poly (2-methyl) n-propylene, R _b ethyl instead of poly (2-ethyl) n-propylene glycol, Rb, Re is methyl and Ra, Rc, Rd, Rf is hydrogen of poly (2,2-dimethyl) propylene glycol n-ideal, wherein R _a Poly-n-propylene glycol (ie, polypropylene glycol) in which R _{f is all hydrogen atoms is even more preferable.} In this specification, poly-n-propylene glycol is sometimes described as polypropylene glycol, and the two are synonymous and refer to the same compound.

The above general formula (2) represents the positive polypropylene glycol (B2), one kind may be a R _a ~ R _f composed of a homopolymer, a copolymer may be composed of different R _a ~ R _f.

Regarding the commercial products of the poly-n-propylene glycol (B2) represented by the above-mentioned general formula (2), the poly-n-propylene glycol in the above-mentioned general formula (2) where _Ra to _{Rf are} all hydrogen atoms, that is, polypropylene glycol The commercially available products can be named "VELVETOL" manufactured by ALLESSA.

The poly-n-propylene glycol (B2) represented by the above-mentioned general formula (2) may also be a direct combination with, for example, polyethylene glycol, polytetramethylene glycol, poly 1,5-pentanediol, and poly 1,6-hexanediol. A copolymer of chain polyalkylene glycol, but from the viewpoint of improving the transparency of the obtained molded product, polypropylene glycol, that is, a homopolymer of poly-n-propylene glycol, is preferred.

Poly-n-propylene glycol (B2) may also contain units selected from the following general formulas (4-1) to (4-4) in addition to the n-propyl ether unit (P1) represented by the following general formula (3) The branched alkylene ether unit (P2) of polyalkylene glycol copolymer.

式中，R_a ～R_f 同前述通式(2)之含義。[化3]

In the formula, R _a to R _{f have the} same meanings as in the aforementioned general formula (2).

式(4-1)～(4-4)中，R¹ ～R¹⁰ 各自獨立地表示氫原子或碳數1～3之烷基，式(4-1)～(4-4)中，R¹ ～R¹⁰ 之至少一者為碳數1～3之烷基。 就通式(4-1)～(4-4)表示之分支伸烷基醚單元而言，可為由通式(4-1)～(4-4)中任一結構之分支伸烷基醚單元構成之均聚物，也可為為多數結構之分支伸烷基醚單元構成之共聚物。[化4]

In the formulas (4-1) to (4-4), R ¹ to R ¹⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbons. In the formulas (4-1) to (4-4), R ^{At least one of 1} to R ¹⁰ is an alkyl group having 1 to 3 carbon atoms. Regarding the branched alkylene ether unit represented by the general formulas (4-1) to (4-4), it can be a branched alkylene ether unit of any structure from the general formulas (4-1) to (4-4) The homopolymer composed of ether units may also be a copolymer composed of branched alkylene ether units with multiple structures.

Regarding the n-propylidene unit represented by the above general formula (3), if it is described as a diol, it is n-propylene glycol. In addition to n-propylene glycol, ethylene glycol, butylene glycol, and 1,5-pentane can also be mixed diol, 1,6-hexanediol, propylene glycol n-but merely preferred, only for the above R _a ~ R _f n are both hydrogen atoms glycol (i.e., propylene glycol) better.

Propylene glycol can be manufactured industrially by the following methods: Hydroformylation of ethylene oxide to obtain 3-hydroxypropionaldehyde, a method of hydrogenating it, or hydration of acrolein to obtain 3-hydroxypropionaldehyde , The method of hydrogenation with Ni catalyst. In addition, recently, some people use the Bio method to reduce glycerol, glucose, starch, etc. by microorganisms to produce propylene glycol.

Regarding the branched alkylene ether unit represented by the above general formula (4-1), if it is described as a diol, (2-methyl)ethylene glycol, (2-ethyl)ethylene glycol, (2 , 2-dimethyl) ethylene glycol, etc., and these may be mixed, and (2-methyl) ethylene glycol and (2-ethyl) ethylene glycol are preferred.

Regarding the branched alkylene ether unit represented by the above general formula (4-2), if it is described as a diol, (2-methyl)propylene glycol, (3-methyl)propylene glycol, (2-ethyl) Propylene glycol, (3-ethyl) triethylene glycol, (2,2-dimethyl) propylene glycol (i.e. neopentyl glycol), (2,2-methylethyl) propylene glycol, (2,2-di Ethyl) propylene glycol, (3,3-dimethyl) propylene glycol, (3,3-methylethyl) propylene glycol, (3,3-diethyl) propylene glycol, etc. may also be mixed.

Regarding the branched alkylene ether unit represented by the above general formula (4-3), if it is described as a diol, (3-methyl)butanediol, (4-methyl)butanediol, and Alcohol, (3-ethyl)butanediol, (4-ethyl)butanediol, (3,3-dimethyl)butanediol, (3,3-methylethyl)butanediol Glycol, (3,3-diethyl)butanediol, (4,4-dimethyl)butanediol, (4,4-methylethyl)butanediol, (4,4 -Diethyl)butylene glycol, etc., which may be mixed, and (3-methyl)butylene glycol is preferred.

Regarding the branched alkylene ether unit represented by the above general formula (4-4), if it is described as a diol, (3-methyl)1,5-pentanediol, (4-methyl) ) 1,5-pentanediol, (5-methyl)1,5-pentanediol, (3-ethyl)1,5-pentanediol, (4-ethyl)1,5-pentanediol , (5-ethyl) 1,5-pentanediol, (3,3-dimethyl) 1,5-pentanediol, (3,3-methylethyl) 1,5-pentanediol, (3,3-Diethyl)1,5-pentanediol, (4,4-dimethyl)1,5-pentanediol, (4,4-methylethyl)1,5-pentanediol Alcohol, (4,4-diethyl)1,5-pentanediol, (5,5-dimethyl)1,5-pentanediol, (5,5-methylethyl)1,5- Pentylene glycol, (5,5-diethyl)1,5-pentanediol, etc., can also be mixed.

Above, the units represented by the general formulas (4-1) to (4-4) constituting the branched alkylene ether units are described simply by taking diols as examples, but they are not limited to these diols, and they may also be used. The alkylene oxide and their polyether-forming derivatives.

If a preferred example of the poly-n-propylene glycol copolymer (B2) is given, it is preferably a copolymer composed of n-propyl ether units and units represented by the aforementioned general formula (4-2), especially a copolymer composed of trimethylene ether units and 3- A copolymer composed of methyl trimethylene ether units is more desirable.

The poly-n-propylene glycol copolymer (B2) may also be a random copolymer or a block copolymer.

The n-propyl ether unit (P1) represented by the aforementioned general formula (3) of the poly-n-propylene glycol copolymer (B2) and the branched alkylene ether unit (P2) represented by the aforementioned general formulas (4-1) to (4-4) The copolymerization ratio is based on the molar ratio of (P1)/(P2), preferably 95/5 to 5/95, more preferably 93/7 to 40/60, and even more preferably 90/10 to 65 /35, it is better to be rich in n-propyl ether units (P1). In addition, the molar fraction was ^{measured using a 1} H-NMR measuring device and deuterated chloroform as a solvent.

Among the above, the particularly desirable poly-n-propylene glycol (B2) is an unsubstituted n-propylene glycol, that is, a homopolymer of propylene glycol.

Regarding the above-mentioned poly-n-propylene glycol (B2), the structure may also contain multiple elements derived from 1,4-butanediol, glycerin, sorbitol, benzenediol, bisphenol A, cyclohexanediol, and spirodiol. The structure of alcohol. By adding these polyols during polymerization of polyalkylene glycol, these organic groups can be imparted to the main chain. Particularly preferably, glycerin, sorbitol, bisphenol A and the like can be cited.

Poly-n-propylene glycol with organic groups in the structure, such as: Polypropylene glycol glyceryl ether, Poly (2-methyl) n-propylene glycol glyceryl ether, Poly-n-propylene glycol-poly(2-methyl) n-propylene glycol glyceryl ether, Poly-n-propylene glycol-poly(2-ethyl) poly-n-propylene glycol glyceryl ether, Poly-n-propylene glycol sorbitol ether, Poly (2-methyl) n-propylene glycol sorbitol ether, Poly-n-propylene glycol-poly(2-methyl)ethylene glycol sorbitol ether, Bisphenol A-bis (poly-n-propylene glycol) ether, Bisphenol A-bis(poly(2-methyl) n-propylene glycol) ether, bisphenol A-bis(poly-n-propylene glycol-poly(2-methyl)ethylene glycol) ether, Bisphenol A-bis(poly-n-propylene glycol-poly(2-ethyl)poly-n-propylene glycol) ether and the like are preferred examples.

The weight average molecular weight (Mw) of poly-n-propylene glycol (B2) is preferably 600-8000, more preferably 800 or more, more preferably 1000 or more, still more preferably 6000 or less, more preferably 5000 or less, especially 4000 the following. If the weight average molecular weight exceeds the above upper limit, compatibility tends to decrease. If the weight average molecular weight is less than the above lower limit, the impact of the composition will decrease. In addition, the weight average molecular weight (Mw) is a polystyrene conversion molecular weight measured by gel permeation chromatography (GPC) with the developing solvent chloroform. Specifically, a high-speed GPC device "HLC-8320" manufactured by Tosoh Corporation was used as the GPC, with a column: manufactured by Tosoh Corporation, HZ-M (4.6mm×150mm)×3 tandem, lysate: chloroform, poly Value obtained by styrene conversion molecular weight (weight average molecular weight).

Among the monomers used as the raw material of the polycarbonate copolymer (B), if a carbonate precursor is given as an example, carbonyl halide, carbonate, etc. can be used. In addition, one type of carbonate precursor may be used, or two or more types may be used in any combination and ratio.

Specific examples of the carbamide are: phosgene; dichloroformate of dihydroxy compound, monochloroformate of dihydroxy compound, etc. haloformate, etc.

Specific examples of carbonates include: diaryl carbonates such as diphenyl carbonate and xylenyl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; dicarbonate esters of dihydroxy compounds, dihydroxy Monocarbonate body, cyclic carbonate and other dihydroxy compound carbonate body, etc.

式(5)中，m、n、l表示整數。The polycarbonate copolymer (B) is preferably a bisphenol A-poly-n-propylene glycol copolymerized polycarbonate represented by the following formula (5). [化5]

In formula (5), m, n, and l represent integers.

The production method of the polycarbonate copolymer (B) is not particularly limited, and any known method can be adopted. Examples include interfacial polymerization, melt transesterification, pyridine, ring-opening polymerization of cyclic carbonate compounds, and solid-phase transesterification of prepolymers. Among them, the melt transesterification method and the interfacial polymerization method are more preferable, and the melt transesterification method is more preferable.

The weight average molecular weight (Mw) of the polycarbonate copolymer (B) is preferably 5,000 to 40,000, more preferably 6,000 or more, still more preferably 7,000 or more, more preferably 37,000 or less, still more preferably 35,000 or less, particularly preferably It is less than 30,000, preferably less than 25,000. If the weight average molecular weight (Mw) exceeds the above upper limit, compatibility tends to decrease. If the weight average molecular weight is lower than the above lower limit, there is a tendency for gas to be generated during molding.

The weight average molecular weight (Mw) of the polycarbonate copolymer (B) can be adjusted by selecting one of the comonomer diol raw materials (B2) poly-n-propylene glycol Mw and the adjustment of the ratio of the carbonate precursor, The addition of the stopper, the adjustment of the temperature and pressure during the polymerization, for example, in order to increase the Mw in the melt transesterification method, the ratio of the monomer raw materials can be adjusted so that the diphenyl carbonate, the carbonate precursor monomer, The reaction ratio with the diol monomer is close to 1, and the polymerization temperature is kept high to make the by-product phenol easily removed from the polymerization system, and the pressure is as low as possible, and the interface is renewed actively by stirring.

In addition, the weight average molecular weight (Mw) of the polycarbonate copolymer (B) is a polystyrene conversion molecular weight measured by GPC using the developing solvent chloroform. Specifically, a high-speed GPC device "HLC-8320" manufactured by Tosoh Corporation was used as the GPC, and a column: manufactured by Tosoh Corporation, HZ-M (4.6mm×150mm)×3 tandem, eluate: chloroform, Measurement temperature: 25°C, a value obtained by polystyrene conversion molecular weight (weight average molecular weight).

In the polycarbonate resin composition of the present invention, the content of the polycarbonate copolymer (B) relative to 100 parts by mass of the polycarbonate resin (A) is 0.1-10 parts by mass, preferably 0.15 parts by mass or more, more It is preferably 0.2 parts by mass or more, preferably 7 parts by mass or less, more preferably 5 parts by mass or less, still more preferably 3 parts by mass or less, particularly preferably 2 parts by mass or less, and most preferably 1 part by mass or less. If the content of the polycarbonate copolymer (B) is less than 0.1 part by mass in the aforementioned range, the hue and heat discoloration resistance will be insufficient, and if it exceeds 10 parts by mass, the material will become cloudy and lose transparency.

[Polycarbonate resin (A)] The polycarbonate resin (A) used in the present invention is not particularly limited as long as it is other than the above-mentioned polycarbonate copolymer (B), and various types can be used. Polycarbonate resins can be classified into aromatic polycarbonate resins in which the carbon directly bonded to the carbonic acid bond is aromatic carbon, and aliphatic polycarbonate resins in which aliphatic carbon is used, but both can be used. Among them, the polycarbonate resin (A) is preferably an aromatic polycarbonate resin from the viewpoint of heat resistance, mechanical properties, electrical properties, and the like.

Among the monomers that become the raw material of aromatic polycarbonate resins, for example, aromatic dihydroxy compounds, one can cite: Dihydroxybenzenes such as 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (that is, resorcinol), and 1,4-dihydroxybenzene; Dihydroxybiphenyls such as 2,5-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl, 4,4'-dihydroxybiphenyl, etc.;

2,2'-Dihydroxy-1,1'-binaphthalene, 1,2-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2, Dihydroxy naphthalenes such as 6-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 2,7-dihydroxynaphthalene;

2,2'-dihydroxydiphenyl ether, 3,3'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether Dihydroxy diaryl ethers such as phenyl ether, 1,4-bis(3-hydroxyphenoxy)benzene, 1,3-bis(4-hydroxyphenoxy)benzene;

2,2-bis(4-hydroxyphenyl)propane (also known as bisphenol A), 1,1-bis(4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis(3-methoxy-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-methoxy-4-hydroxyphenyl)propane, 1,1-bis(3-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis(3-cyclohexyl-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-cyclohexyl-4-hydroxyphenyl)propane, α,α’-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene, 1,3-bis[2-(4-hydroxyphenyl)-2-propyl]benzene, Bis(4-hydroxyphenyl)methane, Bis(4-hydroxyphenyl)cyclohexylmethane, Bis(4-hydroxyphenyl)phenylmethane, Bis(4-hydroxyphenyl)(4-propenylphenyl)methane, Bis(4-hydroxyphenyl)diphenylmethane, Bis (4-hydroxyphenyl) naphthyl methane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)-1-naphthylethane, 1,1-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentane, 1,1-bis(4-hydroxyphenyl)hexane, 2,2-bis(4-hydroxyphenyl)hexane, 1,1-bis(4-hydroxyphenyl)octane, 2,2-bis(4-hydroxyphenyl)octane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-bis(4-hydroxyphenyl)nonane, 1,1-bis(4-hydroxyphenyl)decane, 1,1-bis(4-hydroxyphenyl)dodecane, And other bis(hydroxyaryl)alkanes;

1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,4-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,5-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis(4-hydroxy-3,5-dimethylphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3-propyl-5-methylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3-tert-butyl-cyclohexane, 1,1-bis(4-hydroxyphenyl)-4-tert-butyl-cyclohexane, 1,1-bis(4-hydroxyphenyl)-3-phenylcyclohexane, 1,1-bis(4-hydroxyphenyl)-4-phenylcyclohexane, And other bis(hydroxyaryl) cycloalkanes;

9,9-Bis(4-hydroxyphenyl)sulfuric acid, 9,9-Bis(4-hydroxy-3-methylphenyl)pyridine and other bisphenols containing cardo structure;

4,4’-Dihydroxydiphenyl sulfide, Dihydroxy diaryl sulfides such as 4,4’-dihydroxy-3,3’-dimethyldiphenyl sulfide;

4,4’-dihydroxydiphenyl sulfene, 4,4’-dihydroxy-3,3’-dimethyldiphenyl sulfene and other dihydroxydiaryl sulfenes;

4,4’-Dihydroxydiphenyl sulfide, 4,4’-Dihydroxy-3,3’-dimethyldiphenyl sulfonate and other dihydroxydiaryl sulfonates; Wait.

Among them, bis(hydroxyaryl)alkanes are more desirable, and bis(4-hydroxyphenyl)alkanes are more desirable, especially considering impact resistance and heat resistance. 2,2-bis(4-hydroxy Phenyl) propane (ie, bisphenol A) is preferred. In addition, one type of aromatic dihydroxy compound may be used, or two or more types may be used in any combination and ratio.

Among the monomers used as the raw material of the polycarbonate resin, carbon halides, carbonates, etc. can be used as examples of carbonate precursors. In addition, one type of carbonate precursor may be used, or two or more types may be used in any combination and ratio.

Specific examples of the carbamide are: phosgene; dichloroformate of dihydroxy compound, monochloroformate of dihydroxy compound, etc. haloformate, etc.

Specific examples of carbonates include: diaryl carbonates such as diphenyl carbonate and xylenyl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; dicarbonate esters of dihydroxy compounds, dihydroxy Monocarbonate body, cyclic carbonate and other dihydroxy compound carbonate body, etc.

The production method of the polycarbonate copolymer (A) is not particularly limited, and any known method can be adopted. Examples include interfacial polymerization, melt transesterification, pyridine, ring-opening polymerization of cyclic carbonate compounds, and solid-phase transesterification of prepolymers. Among these, the interfacial polymerization method is particularly preferred.

The molecular weight of the polycarbonate resin (A) is the viscosity average molecular weight (Mv) calculated by using dichloromethane as a solvent and the solution viscosity measured at a temperature of 25°C, preferably 10,000-26,000, more preferably 10,500 or more, and It is more preferably 11,000 or more, particularly preferably 11,500 or more, most preferably 12,000 or more, more preferably 24,000 or less, and still more preferably 20,000 or less. When the viscosity average molecular weight is above the lower limit of the above range, the mechanical strength of the polycarbonate resin composition of the present invention can be improved. When the viscosity average molecular weight is below the upper limit of the above range, the present invention can be suppressed. The fluidity of the polycarbonate resin composition is decreased and can be improved, the molding processability can be improved, and the thin-wall molding process can be easily performed. In addition, two or more types of polycarbonate resins having different viscosity average molecular weights may be mixed. In this case, polycarbonate resins having a viscosity average molecular weight outside the above-mentioned ideal range may also be mixed.

In addition, the viscosity average molecular weight [Mv] refers to the use of dichloromethane as a solvent, the Ubbelohde viscometer is used to obtain the ultimate viscosity [η] (unit dl/g) at a temperature of 25°C, and the viscosity formula of Schnell is also That is, η=1.23×10 ^-4 Mv ^0.83 calculated value. In addition, the limiting viscosity [η] refers to the value of the specific viscosity [η _sp ] measured at the concentration [C] (g/dl) of each solution and calculated according to the following formula. [Number 1]

The terminal hydroxyl group concentration of the polycarbonate resin (A) is arbitrary and may be appropriately selected and determined, and it is usually 1,000 ppm or less, preferably 800 ppm or less, and more preferably 600 ppm or less. Thereby, the retention heat stability and color tone of the polycarbonate resin can be improved. In addition, the lower limit, especially for the polycarbonate resin produced by the melt transesterification method, is usually 10 ppm or more, preferably 30 ppm or more, and more preferably 40 ppm or more. Thereby, the decrease in molecular weight can be suppressed, and the mechanical properties of the resin composition can be improved.

In addition, the unit of the concentration of the terminal hydroxyl group is expressed in ppm by the mass of the terminal hydroxyl group relative to the mass of the polycarbonate resin (A). The measurement method is colorimetric quantification using the titanium tetrachloride/acetic acid method (method described in Macromol. Chem. 88 215 (1965)).

In addition, the polycarbonate resin (A) may contain a polycarbonate oligomer in order to improve the appearance and fluidity of the molded product. The viscosity average molecular weight [Mv] of the polycarbonate oligomer is usually 1,500 or more, preferably 2,000 or more, and usually 9,500 or less, preferably 9,000 or less. Furthermore, the polycarbonate oligomer contained is preferably 30% by mass or less of the polycarbonate resin (including the polycarbonate oligomer).

The polycarbonate resin (A) is not only a virgin raw material, but also a polycarbonate resin regenerated from a used product (so-called polycarbonate resin through material recycling). However, the recycled carbonate resin is preferably 80% by mass or less of the polycarbonate resin (A), and more preferably 50% by mass or less. The reason is that the recycled polycarbonate resin has a high possibility of being degraded by thermal deterioration, aging deterioration, etc. Therefore, if a larger amount of such polycarbonate resin than the aforementioned range is used, the hue and mechanical properties may decrease.

[Phosphorus stabilizer (C)] The polycarbonate resin composition of the present invention contains a phosphorus stabilizer (C). By containing the phosphorus stabilizer, the hue of the polycarbonate resin composition of the present invention becomes better, and the heat discoloration resistance is improved. As the phosphorus stabilizer, any known ones can be used. Specific examples include: phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, polyphosphoric acid and other phosphorus-containing oxygen acids; acidic sodium pyrophosphate, acidic potassium pyrophosphate, acidic calcium pyrophosphate and other acidic pyrophosphate metal salts; potassium phosphate , Sodium phosphate, cesium phosphate, zinc phosphate and other Group 1 or Group 2B metal phosphates; phosphate compounds, phosphite compounds, phosphonite compounds, etc., phosphite compounds are particularly preferred. By selecting the phosphite compound, a polycarbonate resin composition with higher discoloration resistance and continuous productivity can be obtained.

Here, the phosphite compound is a _{trivalent phosphorus compound represented by P(OR) 3} , and R represents a monovalent or divalent organic group. Such phosphite compounds, for example: triphenyl phosphite, ginseng (monononylphenyl) phosphite, ginseng (monononyl/dinonyl·phenyl) phosphite, ginseng (2,4- Di-tert-butylphenyl) phosphite, monooctyl diphenyl phosphite, dioctyl monophenyl phosphite, monodecyl diphenyl phosphite, didecyl monophenyl phosphite Phosphate, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, distearyl neopentyl erythritol diphosphite, bis(2,4-di-tert-butyl-4- Methyl phenyl) neopentyl erythritol phosphite, bis(2,6-di-tert-butylphenyl) octyl phosphite, 2,2-methylene bis(4,6-di-th Tributylphenyl)octyl phosphite, Si (2,4-di-tert-butylphenyl)-4,4'-biphenyl-diphosphite, 6-[3-(3 -Tert-butyl-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]- Dioxaphosphazepine and so on.

Among such phosphite compounds, the aromatic phosphite compound represented by the following formula (1) or (2) is preferable because the polycarbonate resin composition of the present invention can effectively improve the heat discoloration resistance.

式(1)中，R¹ 、R² 及R³ 可各相同也可不同，表示碳數6以上30以下之芳基。[化6]

In the formula (1), R ¹ , R ² and R ³ may be the same or different, and represent an aryl group having 6 to 30 carbon atoms.

式(2)中，R⁴ 及R⁵ 可各相同也可不同，表示碳數6以上30以下之芳基。[化7]

In the formula (2), R ⁴ and R ⁵ may be the same or different, and represent an aryl group having 6 to 30 carbon atoms.

Regarding the phosphite compound represented by the above formula (1), triphenyl phosphite, ginseng (nonylphenyl) phosphite, ginseng (2,4-di-tert-butylphenyl) phosphite Phosphate etc. are more desirable, among which (2,4-di-tert-butylphenyl) phosphite is more desirable. Specific examples of such organic phosphite compounds include "ADEKASTAB1178" manufactured by ADEKA, "SUMILIZER TNP" manufactured by Sumitomo Chemical Co., Ltd., "JP-351" manufactured by Johoku Chemical Industry Co., Ltd., "ADEKASTAB2112" manufactured by ADEKA, BASF Corporation "Irgafos 168", "JP-650" manufactured by Seonghoku Chemical Industry Co., Ltd., etc.

Regarding the phosphite compound represented by the above formula (2), bis(2,4-di-tert-butyl-4-methylphenyl) neopentylerythritol diphosphite, bis(2,6 -Di-tert-butyl-4-methylphenyl)neopentylerythritol diphosphite, bis(2,4-dicumylphenyl)neopentylerythritol diphosphite, etc. The structure of neopentylerythritol diphosphite is particularly preferred. Specific examples of such organic phosphite compounds include "ADEKASTAB PEP-24G" and "ADEKASTAB PEP-36" manufactured by ADEKA, and "Doverphos S-9228" manufactured by Doverchemical.

Among the phosphite compounds, the aromatic phosphite compound represented by the above formula (2) is particularly desirable because of its excellent color. In addition, the phosphorus-based stabilizer may contain one kind, or two or more kinds in any combination and ratio.

The content of the phosphorus stabilizer (C) is 0.005 to 0.5 parts by mass relative to 100 parts by mass of the polycarbonate resin (A), preferably 0.007 parts by mass or more, more preferably 0.008 parts by mass or more, and particularly preferably 0.01 parts by mass Parts or more, preferably 0.4 parts by mass or less, more preferably 0.3 parts by mass or less, still more preferably 0.2 parts by mass or less, and particularly preferably 0.1 parts by mass or less. When the content of the phosphorus stabilizer (C) is less than 0.005 parts by mass of the aforementioned range, the hue and heat discoloration resistance are insufficient. When the content of the phosphorus stabilizer (C) exceeds 0.5 parts by mass, not only the heat discoloration resistance deteriorates, and the heat and heat stability is stable. Sex also declines.

[Epoxy compound and/or oxetane compound (D)] The resin composition of the present invention may also preferably contain an epoxy compound and/or an oxetane compound (D). By containing the epoxy compound and/or the oxetane compound (D), the heat discoloration resistance can be improved. The content of the epoxy compound and/or the oxetane compound (D) is preferably 0.0005 to 0.2 parts by mass relative to 100 parts by mass of the polycarbonate resin (A).

As for the epoxy compound, a compound having one or more epoxy groups in one molecule can be used. Specifically, phenyl glycidyl ether, allyl glycidyl ether, tertiary butyl phenyl glycidyl ether, 3,4-epoxycyclohexylmethyl-3',4'-epoxy ring Hexyl carboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-3',4'-epoxy-6'-methylcyclohexylcarboxylate, 2,3-epoxycyclohexylmethyl -3',4'-epoxycyclohexyl carboxylate, 4-(3,4-epoxy-5-methylcyclohexyl) butyl-3',4'-epoxycyclohexyl carboxylate, 3,4-Epoxycyclohexyloxyethylene, cyclohexylmethyl 3,4-epoxycyclohexyl carboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-6'-methylcyclohexyl Carboxylic acid ester, bisphenol-A diglycidyl ether, tetrabromobisphenol-A glycidyl ether, diglycidyl phthalate, diglycidyl hexahydrophthalate, double Epoxy dicyclopentadienyl ether, diepoxyglycol, diepoxycyclohexyl adipate, butadiene diepoxide, tetraphenylethylene epoxide, octyl epoxy tallate ( octyl epoxy tallate), epoxidized polybutadiene, 3,4-dimethyl-1,2-epoxycyclohexane, 3,5-dimethyl-1,2-epoxycyclohexane, 3- Methyl-5-tert-butyl-1,2-epoxycyclohexane, octadecyl-2,2-dimethyl-3,4-epoxycyclohexyl carboxylate, N-butyl-2 ,2-Dimethyl-3,4-epoxycyclohexyl carboxylate, cyclohexyl-2-methyl-3,4-epoxycyclohexyl carboxylate, N-butyl-2-isopropyl- 3,4-Epoxy-5-methylcyclohexylcarboxylate, octadecyl-3,4-epoxycyclohexylcarboxylate, 2-ethylhexyl-3',4'-epoxycyclohexylcarboxylate Ester, 4,6-dimethyl-2,3-epoxycyclohexyl-3',4'-epoxycyclohexyl carboxylate, 4,5-epoxytetrahydrophthalic anhydride, 3- Tertiary butyl-4,5-epoxytetrahydrophthalic anhydride, 4,5-epoxy-cis-1,2-cyclohexyl dicarboxylic acid diethyl ester, di-n-butyl-3- Tributyl-4,5-epoxy-cis-1,2-cyclohexyl dicarboxylate, epoxidized soybean oil, epoxidized linseed oil, etc. are more ideal examples.

Among them, alicyclic epoxy compounds are more desirable, and 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexyl carboxylate is particularly preferred.

In addition, polyalkylene glycol derivatives having epoxy groups at a single end or both ends can also be preferably used. In particular, polyalkylene glycol having epoxy groups at both ends is preferred.

Polyalkylene glycol derivatives containing epoxy groups in the structure, for example: polyethylene glycol diglycidyl ether, poly(2-methyl)ethylene glycol diglycidyl ether, poly(2-ethyl) ) Ethylene glycol diglycidyl ether, polytetramethylene glycol diglycidyl ether, polyethylene glycol-poly(2-methyl)ethylene glycol diglycidyl ether, polytetramethylene glycol-poly( Polyalkylene glycol derivatives such as 2-methyl)ethylene glycol diglycidyl ether and polytetramethylene glycol-poly(2-ethyl)ethylene glycol diglycidyl ether are preferred examples.

The epoxy compound may be used alone or in combination of two or more kinds.

The ideal content of the epoxy compound is 0.0005 to 0.2 parts by mass relative to 100 parts by mass of the polycarbonate resin (A), more preferably 0.001 parts by mass or more, still more preferably 0.003 parts by mass or more, and particularly preferably 0.005 parts by mass or more , More preferably 0.15 parts by mass or less, still more preferably 0.1 parts by mass or less, and particularly preferably 0.05 parts by mass or less. When the content of the epoxy compound is less than 0.0005 parts by mass, the hue and heat discoloration resistance tend to be unsatisfactory. When the content exceeds 0.2 parts by mass, the heat discoloration resistance tends to deteriorate, and the hue and moisture-heat stability tend to decrease.

The oxetane compound can be used as long as it has more than one oxetanyl group in the molecule. There is one oxetanyl group in the molecule and one oxetane compound in the molecule. Polyoxetane compounds with two or more oxetanyl groups can be used. By containing an oxetane compound, it can make a good hue and a high degree of heat discoloration resistance better.

As far as monooxetane compounds are concerned, compounds represented by the following general formulas (3), (4) or (5), etc. are ideal examples.

[化9]

式(3)～(5)中，R¹ 表示烷基，R² 表示烷基或苯基，R³ 表示也可以有芳香環之2價有機基，n表示0或1。[化8]

[化9]

In formulas (3) to (5), R ¹ represents an alkyl group, R ² represents an alkyl group or a phenyl group, R ³ represents a divalent organic group that may have an aromatic ring, and n represents 0 or 1.

In the above general formulas (3), (4) and (5), R ¹ is an alkyl group, preferably an alkyl group having 1 to 6 carbon atoms, methyl or ethyl is more preferable, and ethyl is particularly preferable. In addition, R ² is an alkyl group or a phenyl group, preferably an alkyl group having 2 to 10 carbon atoms, and may be any of a chain alkyl group, a branched alkyl group, or an alicyclic alkyl group, or it may be an alkyl group. A chain or branched alkyl group with ether bonds (ether-based oxygen atoms) in the base chain. Specific examples of R ² include ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, 3-oxopentyl, cyclohexyl, benzene Base and so on. Among them, R ² is preferably 2-ethylhexyl, phenyl, or cyclohexyl.

Specific examples of the compound of general formula (3) include 3-hydroxymethyl-3-methyloxetane, 3-hydroxymethyl-3-ethyloxetane, 3-hydroxymethyl -3-propyloxetane, 3-hydroxymethyl-3-n-butyloxetane, 3-hydroxymethyl-3-propyloxetane, etc. are ideal examples. Among them, 3-hydroxymethyl-3-methyloxetane, 3-hydroxymethyl-3-ethyloxetane, etc. are particularly preferred. Specific examples of the compound of the general formula (4) are 3-ethyl-3-(2-ethylhexyloxymethyl)oxetane and the like.

In the general formula (5), R ³ is a divalent organic group that may also have an aromatic ring, and examples include ethylidene, propylidene, butylene, neopentyl, n-pentyl, and n-hexyl. Linear or branched alkylene and phenylene with carbon number 1-12, formula: -CH ² -Ph-CH ² -or -CH ² -Ph-Ph-CH ^2- (here, Ph It represents a divalent group represented by a phenyl group, a hydrogenated bisphenol A residue, a hydrogenated bisphenol F residue, a hydrogenated bisphenol Z residue, a cyclohexanedimethanol residue, a tricyclodecanedimethanol residue, and the like.

Specific examples of the compound of the general formula (5) include: bis(3-methyl-3-glycidylmethyl)ether, bis(3-ethyl-3-glycidylmethyl)ether, Bis(3-propyl-3-glycidylmethyl)ether, bis(3-butyl-3-glycidylmethyl)ether, 1,4-bis[(3-ethyl-3- Glycidyl methoxy) methyl] benzene, 3-ethyl-3 {[(3-ethyloxetan-3-yl) methoxy] methyl} oxetane, 4 ,4'-Bis[(3-ethyl-3-glycidyl)methoxymethyl]biphenyl, 1,4-bis[(3-ethyl-3-glycidyl)methoxy Methyl]benzene and the like are particularly good examples.

The oxetane compound may be used alone or in combination of two or more kinds.

The content when the oxetane compound is contained relative to 100 parts by mass of the polycarbonate resin (A) is preferably 0.0005 to 0.2 parts by mass, more preferably 0.001 parts by mass or more, and still more preferably 0.003 parts by mass or more, It is particularly preferably 0.005 parts by mass or more, more preferably 0.15 parts by mass or less, still more preferably 0.1 parts by mass or less, and particularly preferably 0.05 parts by mass or less. When the content of the oxetane compound is less than 0.0005 parts by mass, the hue and heat discoloration resistance are likely to be unsatisfactory, and when it exceeds 0.2 parts by mass, the heat discoloration resistance tends to deteriorate instead, and gas is likely to be generated during molding.

It is also desirable to contain both an epoxy compound and an oxetane compound. When both are contained, the total content is preferably 0.0005 to 0.2 parts by mass relative to 100 parts by mass of the polycarbonate resin (A).

[Polyalkylene glycol] It is also desirable that the resin composition of the present invention contains polyalkylene glycol.

As far as the polyalkylene glycol compound is concerned, it has a linear alkylene ether unit (P1) represented by the following general formula (2) and a branched extension selected from the units represented by the following general formulas (2A) to (2D) The polyalkylene glycol copolymer (CP) of the alkyl ether unit (P2) is a preferred example.

通式(2)中，t表示3～6之整數。[化10]

In the general formula (2), t represents an integer of 3-6.

[化11]

In the general formulas (2A) to (2D), R ³¹ to R ⁴⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. In the general formulas (2A) to (2D), ^{at least one of R 31} to R ⁴⁰ is an alkyl group having 1 to 3 carbon atoms.

Regarding the linear alkylene ether unit (P1) represented by the general formula (2), if it is described as a diol, propylene glycol with t being 3, butylene glycol with t being 4, and butylene glycol with t being 5 1,5-pentanediol, t is 6, 1,6-hexanediol. Propylene glycol and butylene glycol are preferred, and butylene glycol is particularly preferred.

Propylene glycol (ie n-propylene glycol) can be industrially obtained by hydrogenation of ethylene oxide to obtain 3-hydroxypropionaldehyde, which is hydrogenated, or acrolein (acrolein) is hydrated to obtain 3-hydroxypropanal Propionaldehyde is produced by hydrogenation using Ni catalyst. In addition, the Bio method can also be used to produce propylene glycol by reducing glycerol, glucose, starch, etc. by microorganisms.

Regarding the branched alkylene ether unit represented by the general formula (2A), if it is described as a diol, it can include: (2-methyl)ethylene glycol (that is, propylene glycol), (2-ethyl) Ethylene glycol (that is, butylene glycol), (2,2-dimethyl) ethylene glycol (that is, neopentyl glycol), etc.

Regarding the branched alkylene ether unit represented by the general formula (2B), if it is described as a diol, it may include: (2-methyl) propylene glycol, (3-methyl) propylene glycol, (2-ethyl) ) Propylene glycol, (3-ethyl) triethylene glycol, (2,2-dimethyl) propylene glycol, (2,2-methylethyl) propylene glycol, (2,2-diethyl) propylene glycol (i.e. Neopentyl glycol), (3,3-dimethyl)propanediol, (3,3-methylethyl)propanediol, (3,3-diethyl)propanediol, etc.

Regarding the branched alkylene ether unit represented by the general formula (2C), if it is described as a diol, (3-methyl) butylene glycol, (4-methyl) butylene glycol, (3-ethyl)butanediol, (4-ethyl)butanediol, (3,3-dimethyl)butanediol, (3,3-methylethyl)butanediol , (3,3-diethyl)butanediol, (4,4-dimethyl)butanediol, (4,4-methylethyl)butanediol, (4,4-di Ethyl) butylene glycol, etc., (3-methyl) butylene glycol is preferred.

Regarding the branched alkylene ether unit represented by the general formula (2D), if it is described as a diol, (3-methyl)1,5-pentanediol, (4-methyl)1, 5-pentanediol, (5-methyl)1,5-pentanediol, (3-ethyl)1,5-pentanediol, (4-ethyl)1,5-pentanediol, (5 -Ethyl) 1,5-pentanediol, (3,3-dimethyl) 1,5-pentanediol, (3,3-methylethyl) 1,5-pentanediol, (3, 3-Diethyl)1,5-pentanediol, (4,4-dimethyl)1,5-pentanediol, (4,4-methylethyl)1,5-pentanediol, ( 4,4-Diethyl)1,5-pentanediol, (5,5-dimethyl)1,5-pentanediol, (5,5-methylethyl)1,5-pentanediol , (5,5-Diethyl)1,5-pentanediol, etc.

In the above, the units represented by the general formulas (2A) to (2D) constituting the branched alkylene ether unit (P2) are simply described using diols as examples, but they are not limited to these diols, and may be of them. Alkylene oxide and their polyether forming derivatives.

Preferred examples of polyalkylene glycol copolymers (CP) include: copolymers composed of tetramethylene ether (ie, butylene glycol) units and units represented by the general formula (2A) are more desirable. Especially composed of tetramethylene ether (i.e. butylene glycol) units and 2-methyl ethylene ether (i.e. propylene glycol) units and/or (2-ethyl) ethylene glycol (i.e. butylene glycol) units The copolymer is preferred. A copolymer composed of a tetramethylene ether unit and a 2,2-dimethyl trimethylene ether unit, that is, a neopentyl glycol ether unit, is also ideal.

The method for producing a polyalkylene glycol copolymer (CP) having a linear alkylene ether unit (P1) and a branched alkylene ether unit (P2) is well-known, and it is usually possible to use an acid catalyst as described above It is manufactured by polycondensation of glycol, alkylene oxide or its polyether-forming derivative.

The polyalkylene glycol copolymer (CP) may also be a random copolymer or a block copolymer.

The terminal group of the polyalkylene glycol copolymer (CP) is preferably a hydroxyl group. Polyalkylene glycol copolymer (CP), even if its single or both ends are capped with alkyl ether, aryl ether, aralkyl ether, fatty acid ester, aryl ester, etc., its performance will not be affected. Ether compound or ester Compounds can also be used.

Regarding the alkyl group constituting the alkyl ether, it can be linear or branched. Examples include alkyl groups with 1 to 22 carbon atoms, such as methyl, ethyl, propyl, butyl, octyl, and lauryl. , Stearyl etc. Alkyl ethers include methyl ether, diethyl ether, butyl ether, lauryl ether, stearyl ether, etc. of polyalkylene glycol as preferred examples.

The aryl group constituting the aryl ether is preferably an aryl group having 6 to 22 carbon atoms, more preferably 6 to 12 carbon atoms, and still more preferably an aryl group having 6 to 10 carbon atoms, such as phenyl, tolyl, naphthyl, etc., phenyl , Tolyl, etc. are preferred. The aralkyl group is preferably an aralkyl group having 7 to 23 carbon atoms, more preferably 7 to 13 carbon atoms, and still more preferably an aralkyl group having 7 to 11 carbon atoms, such as benzyl, phenethyl, etc., and benzyl is particularly preferred.

The fatty acid constituting the fatty acid ester may be linear or branched, and may be saturated fatty acid or unsaturated fatty acid.

Examples of fatty acids constituting fatty acid esters include monovalent or divalent fatty acids having 1 to 22 carbon atoms. Monovalent saturated fatty acids, such as formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, heptanoic acid, caprylic acid, capric acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, Stearic acid, nonadenosic acid, arachidic acid, and behenic acid. Monovalent unsaturated fatty acids, for example: oleic acid, elaidic acid, linoleic acid, linolenic acid, arachidic acid and other unsaturated fatty acids. Divalent fatty acids with more than 10 carbon atoms, such as sebacic acid, undecanedioic acid, dodecanedioic acid, tetradecanedioic acid, tapsia acid and decanedioic acid, undecenedioic acid, dodecene Diacid.

The aryl group constituting the aryl ester preferably has 6 to 22 carbon atoms, more preferably 6 to 12 carbon atoms, more preferably 6 to 10 carbon aryl groups, such as phenyl, tolyl, naphthyl, etc., Phenyl, tolyl, etc. are preferred. The terminal sealing group, even if it is an aralkyl group, has good compatibility with the polycarbonate resin (A), so it can exhibit the same effect as an aryl group. The aralkyl group preferably has 7 to 23 carbon atoms, more preferably 7 to 13 carbon atoms, and even more preferably an aralkyl group with 7 to 11 carbon atoms, such as benzyl, phenethyl, etc., benzyl is particularly preferred .

Regarding the polyalkylene glycol copolymer (CP), the copolymer is composed of tetramethylene ether unit and 2-methylethylene ether unit, and is composed of tetramethylene ether unit and 3-methyltetramethylene ether. Copolymers composed of ether units, copolymers composed of tetramethylene ether units and 2,2-dimethyltrimethylene ether units are particularly preferred. Commercial products of such polyalkylene glycol copolymers include the product name "Polycerin DCB" manufactured by NOF Corporation, the product name "PTG-L" manufactured by Hodogaya Chemical Corporation, and the product name "PTG-L" manufactured by Asahi Kasei Textile Co., Ltd. PTXG" and so on.

A copolymer composed of a tetramethylene ether unit and a 2,2-dimethyltrimethylene ether unit can also be produced by the method described in Japanese Patent Application Laid-Open No. 2016-125038.

As for the polyalkylene glycol compound, a branched polyalkylene glycol compound represented by the following general formula (3A) or a linear polyalkylene glycol compound represented by the following general formula (3B) is also desirable example. The branched polyalkylene glycol compound represented by the following general formula (3A) or the linear polyalkylene glycol compound represented by the following general formula (3B) may also be a copolymer with other copolymerization components, but Homopolymers are preferred.

[化12]

In the general formula (3A), R represents an alkyl group having 1 to 3 carbon atoms. Q ¹ and Q ² each independently represent a hydrogen atom, an aliphatic acyl group having 1 to 23 carbons, or an alkyl group having 1 to 23 carbons. r represents an integer of 5 to 400.

[化13]

In the general formula (3B), Q ³ and Q ⁴ each independently represent a hydrogen atom, an aliphatic acyl group having 2 to 23 carbons, or an alkyl group having 1 to 23 carbons. p represents an integer of 2-6, and q represents an integer of 6-100.

In the general formula (3A), the integer (degree of polymerization) r is 5 to 400, preferably 10 to 200, more preferably 15 to 100, and particularly preferably 20 to 50. When the degree of polymerization r is less than 5, the amount of gas generated during molding increases, and the gas may cause molding defects, such as unfilled, gas burn, and poor transfer. When the polymerization degree r exceeds 400, there is a possibility that the effect of improving the hue of the pellets of the present invention may not be sufficiently obtained.

As far as the branched polyalkylene glycol compound is concerned, it is preferably a polypropylene glycol in the general formula (3A) where Q ¹ and Q ² are hydrogen atoms and R is a methyl group (that is, poly(2-methyl)ethylene two Alcohol), R-based polytetramethylene glycol (ie, poly(2-ethyl) ethylene glycol) is ideal, and particularly preferably polytetramethylene glycol (ie, poly(2-ethyl) ethylene glycol) alcohol).

In the general formula (3B), q (polymerization degree) is an integer of 6-100, preferably 8-90, more preferably 10-80. When the degree of polymerization q is less than 6, gas is generated during molding, which is undesirable. When the degree of polymerization q exceeds 100, the compatibility is lowered, which is undesirable.

The linear polyalkylene glycol compound includes polyethylene glycol in which Q ³ and Q ⁴ in the general formula (3B) are hydrogen atoms and p is 2, polypropylene glycol in which p is 3, and p is Polytetramethylene glycol 4, poly-1,5-pentanediol whose p is 5, and poly-1,6-hexanediol whose p is 6 are ideal examples, more preferably polypropylene glycol, polytetramethylene glycol or Esterification or etherification.

As far as the polyalkylene glycol compound is concerned, even if its single or both ends are blocked by fatty acids or alcohols, it does not affect its performance. Fatty acid esters or ethers can also be used. ^{Therefore, Q 1} to Q ⁴ in the general formulas (3A) and (3B) may also be aliphatic acyl groups or alkyl groups having 1 to 23 carbon atoms.

As far as fatty acid esters are concerned, either linear or branched fatty acid esters can be used. The fatty acid constituting the fatty acid ester may be a saturated fatty acid or an unsaturated fatty acid. Part of the hydrogen atoms can also be substituted with substituents such as hydroxyl groups.

Examples of fatty acids constituting fatty acid esters include monovalent or divalent fatty acids having 1 to 23 carbon atoms. Specific examples of monovalent saturated fatty acids include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, heptanoic acid, caprylic acid, capric acid, lauric acid, myristic acid, pentadecyl acid, and palmitic acid. , Seventeen acid, stearic acid, undecanoic acid, arachidic acid, behenic acid. Specific examples of monovalent unsaturated fatty acids include unsaturated fatty acids such as oleic acid, elaidic acid, linoleic acid, hypolinoleic acid, and arachidic acid. Specific examples of divalent fatty acids with carbon number 10 or more include sebacic acid, undecanedioic acid, dodecanedioic acid, tetradecanedioic acid, tapsia acid, decanedioic acid, undecenedioic acid, Dodecenedioic acid.

The fatty acid can be used 1 type or in combination of 2 or more types. Fatty acids also include fatty acids with one or more hydroxyl groups in the molecule.

Desirable specific examples of the fatty acid esters of branched polyalkylene glycols include: in the general formula (3A), R is a methyl group, and Q ¹ and Q ² are polypropylene glycol stearyl esters with a carbon number of 18 aliphatic groups. Polypropylene glycol behenate in which R is methyl, and Q ¹ and Q ² are aliphatic acyl groups with 22 carbon atoms. Desirable specific examples of the fatty acid ester of linear polyalkylene glycol include: polyalkylene glycol monopalmitate, polyalkylene glycol dipalmitate, polyalkylene glycol mono Stearate, polyalkylene glycol distearate, polyalkylene glycol (monopalmitic acid, monostearic acid) ester, polyalkylene glycol behenate, etc.

The alkyl group constituting the alkyl ether of the polyalkylene glycol can be linear or branched, such as methyl, ethyl, propyl, butyl, octyl, lauryl, stearyl, etc. Carbon number 1 ～23 of the alkyl group. As the polyalkylene glycol compound, alkyl methyl ether, diethyl ether, butyl ether, lauryl ether, stearyl ether and the like of polyalkylene glycol can be mentioned as ideal examples.

Commercial products of the branched polyalkylene glycol compound represented by the general formula (3A) include the product names "UNIOL D-1000" and "UNIOL PB-1000" manufactured by NOF Corporation.

Polyalkylene glycol copolymer (CP), branched polyalkylene glycol compound represented by general formula (3A), linear polyalkylene glycol compound represented by general formula (3B), etc. The number average molecular weight of the base diol compound is preferably 200 to 5000, more preferably 300 or more, still more preferably 500 or more, more preferably 4000 or less, more preferably 3000 or less, particularly preferably 2000 or less, particularly preferably no Up to 1000, ideally less than 800. If the number average molecular weight exceeds the above upper limit, compatibility tends to decrease. If the number average molecular weight is less than the above lower limit, there is a tendency for gas to be generated during molding. The number average molecular weight of the polyalkylene glycol compound is the number average molecular weight calculated based on the hydroxyl value measured in accordance with JIS K1577.

These polyalkylene glycol compounds may be used individually by 1 type, and may use 2 or more types together.

When the resin composition of the present invention contains a polyalkylene glycol compound, its content relative to 100 parts by mass of the polycarbonate resin (A) is preferably 0.001 to 1.0 parts by mass, more preferably 0.01 to 0.8 parts by mass, and most preferably It is 0.1 to 0.5 parts by mass. The content of the polyalkylene glycol compound does not reach the above lower limit or exceeds the above upper limit, the resulting molded article tends to have poor hue

[Release Agent] It is also desirable that the resin composition of the present invention contains a mold release agent. Release agents, such as: aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds with a number average molecular weight of 200 to 15,000, polysiloxane-based polysiloxane oils, etc.

Aliphatic carboxylic acids, such as saturated or unsaturated aliphatic mono-, di- or tri-carboxylic acids. Here, aliphatic carboxylic acids also include alicyclic carboxylic acids. Among them, the ideal aliphatic carboxylic acid is a monovalent or divalent carboxylic acid having 6 to 36 carbon atoms, and an aliphatic saturated monovalent carboxylic acid having 6 to 36 carbon atoms is more preferable. Specific examples of this aliphatic carboxylic acid include palmitic acid, stearic acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, hexanoic acid, triacontan Tetraacid, octadecanoic acid, adipic acid, azelaic acid, etc.

As the aliphatic carboxylic acid in the ester of aliphatic carboxylic acid and alcohol, for example, the same aliphatic carboxylic acid can be used. On the other hand, alcohols are, for example, saturated or unsaturated monohydric or polyhydric alcohols. These alcohols may have substituents such as a fluorine atom and an aryl group. Among them, mono- or polyvalent saturated alcohols with a carbon number of 30 or less are more preferable, and aliphatic saturated monohydric alcohols or aliphatic saturated polyols with a carbon number of 30 or less are more preferable. In addition, here, the aliphatic system is used in terms that also include alicyclic compounds.

Specific examples of the alcohol include: octanol, decyl alcohol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, neopentyl erythritol, 2,2-dihydroxy all Fluoropropanol, neopentyl glycol, di(trimethylol)propane, dineopentylerythritol, etc.

In addition, the above-mentioned ester may contain aliphatic carboxylic acid and/or alcohol as impurities. In addition, the above-mentioned ester may be a pure substance or a mixture of a plurality of compounds. In addition, the aliphatic carboxylic acid and alcohol which are bonded to form one ester may be used individually by 1 type, and may use 2 or more types together in arbitrary combinations and ratios.

Specific examples of esters of aliphatic carboxylic acids and alcohols include: beeswax (a mixture with triacontan palmitate as the main component), stearyl stearate, behenyl behenate, and behenic acid Stearyl ester, glyceryl monopalmitate, glyceryl monostearate, glyceryl distearate, glyceryl tristearate, neopentyl erythritol monopalmitate, neopentyl erythritol monostearate , Neopentaerythritol Distearate, Neopentaerythritol Tristearate, Neopentaerythritol Tetrastearate, etc.

Aliphatic hydrocarbons with a number average molecular weight of 200 to 15,000, such as fluidized paraffin, paraffin, microcrystalline wax, polyethylene wax, Fischer-Tropsch wax, alpha-olefin oligomers with 3-12 carbons, etc. Here, aliphatic hydrocarbons also include alicyclic hydrocarbons. In addition, these hydrocarbons may also be partially oxidized. Among them, paraffin wax, polyethylene wax, or partial oxide of polyethylene wax is preferable, and paraffin wax and polyethylene wax are even more preferable. In addition, the number average molecular weight of the aforementioned aliphatic hydrocarbon is preferably 5,000 or less. In addition, the aliphatic hydrocarbon may be a single substance, but even a mixture of constituents and molecular weights that are different from each other can be used as long as the main component is within the above-mentioned range.

Polysiloxane based silicone oil, such as: dimethyl silicone oil, methyl phenyl silicone oil, diphenyl silicone oil, fluorinated alkyl silicone, etc.

Moreover, the said mold release agent may contain 1 type, and may contain 2 or more types by arbitrary combinations and ratios.

The content of the release agent is usually 0.001 parts by mass or more, preferably 0.01 parts by mass or more, and usually 2 parts by mass or less, preferably 1 part by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). When the content of the mold release agent does not reach the lower limit of the aforementioned range, the effect of mold release is sometimes insufficient. When the content of the mold release agent exceeds the upper limit of the aforementioned range, the hydrolysis resistance may decrease, and the mold during injection molding may occur. Pollution etc.

[Additives etc.] The polycarbonate resin composition of the present invention may contain additives other than the above, such as antioxidants, ultraviolet absorbers, fluorescent brighteners, pigments, dyes, polymers other than polycarbonate resins, and flame retardants , Impact modifiers, antistatic agents, plasticizers, solubilizers and other additives. These additives can be blended with one kind or two or more kinds. However, when it contains polymers other than polycarbonate resin (A) and polycarbonate copolymer (B), the content is relative to 100 parts by mass of the total of polycarbonate resin (A) and polycarbonate copolymer (B) It is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, still more preferably 5 parts by mass or less, and particularly preferably 3 parts by mass or less.

[Manufacturing method of polycarbonate resin composition] The production method of the polycarbonate resin composition of the present invention is not limited, and the known production methods of polycarbonate resin composition can be widely used, for example, polycarbonate resin (A), polycarbonate copolymer (B) and phosphorus It is a stabilizer (C), and other ingredients blended as necessary. After pre-mixing with various mixers such as rolling machines, Henschel mixers, etc., use Banbury mixers, rollers, Brabender, and single-shaft kneading and extruding. The method of melting and kneading by a mixer such as a press, a biaxial kneading extruder, and a kneading machine. In addition, the temperature of melt-kneading is not particularly limited, but it is usually in the range of 240 to 320°C.

[Polycarbonate resin composition] The polycarbonate resin composition of the present invention is excellent in hue, so it is excellent in YI (yellow discoloration), the initial YI value of 300mm optical path length is preferably 25 or less, and the heat discoloration resistance is excellent, so after keeping at 95°C for 1000 hours The difference (ΔYI) between the YI value of the 300mm optical path length and the initial YI value is preferably 6 or less. The initial YI value is more preferably 24 or less, more preferably 22 or less, and still more preferably 20 or less. ΔYI is more preferably 5 or less, and still more preferably 4 or less. In addition, the initial YI value and ΔYI are measured by molding a long optical path molded product (300mm×7mm×4mm) at a resin temperature of 340°C and a mold temperature of 80°C, and measuring the optical path length of 300mm at C light source, 2° The YI value (initial YI value) under visual field conditions is then measured after being kept at 95°C for 1000 hours, and the difference ΔYI of the initial YI value is summed.

The polycarbonate resin composition of the present invention has excellent impact resistance. Therefore, the notched Charpy impact strength of a 3mm thick molded article based on ISO179 is preferably 25kJ/m ² or more, more preferably 30kJ/m ² or more. More preferably, it is 35 kJ/m ² or more.

In addition, the present invention further provides the following polycarbonate resin composition. That is, a polycarbonate resin composition characterized by containing 0.001 to 0.5 parts by mass of a stabilizer relative to 100 parts by mass of the polycarbonate resin (A), and an initial YI value of less than 25 for an optical path length of 300 mm. The difference (ΔYI) between the YI value of the 300mm optical path length and the initial YI value after being kept at 95°C for 1000 hours is 6 or less. The initial YI value is preferably 24 or less, more preferably 22 or less, and even more preferably 20 or less. ΔYI is preferably 5 or less, more preferably 4 or less. The stabilizer at this time is preferably a phosphorus stabilizer. The phosphorus stabilizer is as described above. Further, the polycarbonate resin composition, based on ISO179 attachment notch of 3mm thick molded article of the impact strength of summer Pi 25kJ / m ² or more preferably, more preferably 30kJ / m ² or more, and more preferably 35kJ / m ² or more.

[Optical Parts] In the polycarbonate resin composition of the present invention, the above-mentioned polycarbonate resin composition can be pelletized into pellets and then molded by various molding methods to manufacture optical parts. It is also possible to directly shape the resin melted and kneaded by the extruder into optical parts without using pellets.

The polycarbonate resin composition of the present invention has excellent fluidity, hue, and minimal gas generation and mold contamination during molding. Therefore, it is particularly suitable for molding optical parts by injection molding, especially thin-walled optical parts that are prone to mold contamination. The resin temperature during injection molding, especially in the case of thin-walled molded products, should be molded at a higher resin temperature than 260-300°C, which is generally suitable for polycarbonate resin injection molding, which is 305-400°C. The resin temperature is better. The resin temperature is more preferably 310°C or higher, even more preferably 315°C or higher, particularly preferably 320°C or higher, and more preferably 390°C or lower. When using a conventional polycarbonate resin composition, if the resin temperature during molding is increased in order to mold a thin-walled molded product, there is a problem that yellowing of the molded product is likely to occur. However, by using the resin composition of the present invention , Even in the above temperature range, molded products with good hue and high transparency can be produced, especially thin-walled optical parts. In addition, when it is difficult to directly measure the resin temperature, set the barrel temperature.

Here, a thin-walled molded product generally refers to a molded product having a plate-shaped portion with a wall thickness of 1 mm or less, preferably 0.8 mm or less, and more preferably 0.6 mm or less. Here, the plate-shaped portion may be a flat plate or a curved plate, and may be a flat surface, or the surface may have unevenness, etc., and the cross-section may have an inclined surface or a wedge-shaped cross-section.

Optical parts include parts of equipment and appliances that directly or indirectly use light sources such as LEDs, organic EL, incandescent light bulbs, fluorescent lamps, and cathode tubes. Typical examples include light guide plates and surface light-emitting members. The light guide plate is used to guide light from light sources such as LEDs in the liquid crystal backlight unit, various display devices, and lighting devices, so that the light entering from the side or back surface is diffused by the unevenness usually provided on the surface. And emit uniform light. The shape is usually flat, and the surface may or may not have irregularities. The forming of the light guide plate is usually preferably performed by injection molding method, ultra-high-speed injection molding method, injection compression molding method, melt extrusion molding method (for example, T-die molding method), etc. The light guide plate formed by using the resin composition of the present invention will not have white turbidity and decrease in transmittance, can exhibit good hue and high transparency, and has less molding defects due to mold contamination.

The light guide plate using the polycarbonate resin composition of the present invention is suitable for use in the fields of liquid crystal backlight units, various display devices, and lighting devices. Such devices, such as mobile phones, portable notebooks, Internet books, slate PCs, tablet PCs, smart phones, tablet terminals and other portable terminals, cameras, clocks, notebook computers , Various displays, lighting equipment, etc.

In addition, the shape of the optical component may be a film or a sheet, and specific examples thereof include a light guide film.

In addition, as optical parts, light guides, lenses, etc., which guide light from light sources such as LEDs, are also suitable for use in vehicle headlights (headlights) or taillights, fog lights, etc., for automobiles, locomotives, etc., and are also suitable for use in they.

The light guide plate using the polycarbonate resin composition of the present invention is suitable for use in the fields of liquid crystal backlight units, various display devices, and lighting devices. Such devices include various portable terminals such as mobile phones, portable notebooks, Internet books, tablet computers, tablet computers, smart phones, tablet terminals, cameras, clocks, notebook computers, various displays, lighting equipment, etc. [Example]

The following examples illustrate the present invention in more detail. However, the present invention is not limited to the following examples and explained. The raw materials used in the following examples and comparative examples are shown in Table 1.

以末端結構為以下表示之對第三丁基苯基之 雙酚A作為出發原料之界面聚合法獲得之芳香族聚碳酸酯樹脂 三菱工程塑膠公司製、商品名「H-4000F」 Mv：16,000 A2

以末端結構為以下表示之對第三丁基苯基之 雙酚A作為出發原料之界面聚合法獲得之芳香族聚碳酸酯樹脂 三菱工程塑膠公司製、商品名「H-7000F」 Mv：14,000 A3

以末端結構為以下表示之對第三辛基苯基之 雙酚A作為出發原料之界面聚合法獲得之芳香族聚碳酸酯樹脂 三菱瓦斯化學公司製、商品名「T-3700」 Mv：17,500 A4

以末端結構為以下表示之對第三辛基苯基之 雙酚A作為出發原料之界面聚合法獲得之芳香族聚碳酸酯樹脂 三菱瓦斯化學公司製、商品名「T-3841」 Mv：13,500 聚碳酸酯共聚物(B) B1 製造例1製造之聚碳酸酯共聚物 雙酚A：聚正丙二醇=15質量%：85質量% Mw：15,400 B2 製造例2製造之聚碳酸酯共聚物 雙酚A：聚正丙二醇=15質量%：85質量% Mw：18,800 B3 製造例3製造之聚碳酸酯共聚物 雙酚A：聚正丙二醇=15質量%：85質量% Mw：22,800 B4 製造例4製造之聚碳酸酯共聚物 雙酚A：聚正丙二醇=15質量%：85質量% Mw：34,100 聚伸烷基二醇 X1 聚伸丁二醇 三菱化學公司製、商品名「PTMG3000」、Mw：11,900 X2 聚伸丁二醇 三菱化學公司製、商品名「PTMG1500」、Mw：5,400 X3 聚伸丁二醇 三菱化學公司製、商品名「PTMG650」、Mw：1,950 X4 聚正丙二醇 Allesa公司製、商品名「Velvetol H2000」、Mw：6,900 X5 聚丙二醇亦即聚(2-甲基)乙二醇 日油公司製、商品名「UNIOL D-2000」、Mw：3,200 X6 聚氧四亞甲基-聚氧丙二醇 亦即聚氧四亞甲基-聚氧(2-甲基)乙二醇 日油公司製、商品名「Polycerin DCB-2000」、Mw：4,500 其他 聚碳酸酯 共聚物 Y1 製造例5製造之聚碳酸酯共聚物 雙酚A：聚伸丁二醇=15質量%：85質量% Mw：22,800 磷系 安定劑(C) C1 雙(2,6-二-第三丁基-4-甲基苯基)新戊四醇二亞磷酸酯 ADEKA公司製、商品名「ADEKASTAB PEP-36」 C2 參(2,4-二ー第三丁基苯基)亞磷酸酯 ADEKA公司製、商品名「ADEKASTAB2112」 C3 雙(2,4-二異丙苯基苯基)新戊四醇二亞磷酸酯 Doverchemical公司製、商品名「Doverphos S-9228PC」 環氧或 氧雜環丁烷 化合物(D) D1 3,4-環氧環己基甲基-3’，4’-環氧環己烷羧酸酯 Daicel公司製、商品名「Celloxide 2021P」 D2 3-乙基-3｛[(3-乙基氧雜環丁烷-3-基)甲氧基]甲基｝氧雜環丁烷 東亞合成公司製、商品名「ARON OXETANE OXT- 221」 脫模劑(E) E1 甘油單硬脂酸酯 理研維他命公司製、商品名「RIKEMAL S-100A」 [Table 1] ingredient Abbreviation Polycarbonate resin (A) A1

Aromatic polycarbonate resin obtained by the interfacial polymerization method using bisphenol A whose end structure is the following p-tert-butylphenyl group as the starting material, manufactured by Mitsubishi Engineering Plastics Co., Ltd., trade name "H-4000F" Mv: 16,000 A2

Aromatic polycarbonate resin obtained by the interfacial polymerization method using bisphenol A whose terminal structure is the following p-tert-butylphenyl group as the starting material, manufactured by Mitsubishi Engineering Plastics Corporation, trade name "H-7000F" Mv: 14,000 A3

An aromatic polycarbonate resin obtained by the interfacial polymerization method using bisphenol A whose terminal structure is the p-tertyl phenyl group shown below as the starting material, manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "T-3700" Mv: 17,500 A4

Aromatic polycarbonate resin obtained by the interfacial polymerization method using bisphenol A whose terminal structure is the p-tertyl phenyl group shown below as the starting material, manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "T-3841" Mv: 13,500 Polycarbonate copolymer (B) B1 The polycarbonate copolymer bisphenol A produced in Production Example 1: Poly-n-propylene glycol = 15% by mass: 85% by mass Mw: 15,400 B2 Production Example 2 Polycarbonate copolymer Bisphenol A: Poly-n-propylene glycol = 15% by mass: 85% by mass Mw: 18,800 B3 Production Example 3 Polycarbonate copolymer bisphenol A: Poly-n-propylene glycol = 15% by mass: 85% by mass Mw: 22,800 B4 The polycarbonate copolymer bisphenol A produced in Production Example 4: Poly-n-propylene glycol = 15% by mass: 85% by mass Mw: 34,100 Polyalkylene glycol X1 Polytetramethylene glycol manufactured by Mitsubishi Chemical Corporation, trade name "PTMG3000", Mw: 11,900 X2 Polytetramethylene glycol manufactured by Mitsubishi Chemical Corporation, brand name "PTMG1500", Mw: 5,400 X3 Polytetramethylene glycol manufactured by Mitsubishi Chemical Corporation, trade name "PTMG650", Mw: 1,950 X4 Polypropylene glycol manufactured by Allesa, trade name "Velvetol H2000", Mw: 6,900 X5 Polypropylene glycol, also known as poly(2-methyl)ethylene glycol, manufactured by NOF Corporation, trade name "UNIOL D-2000", Mw: 3,200 X6 Polyoxytetramethylene-polyoxypropylene glycol, also known as polyoxytetramethylene-polyoxy(2-methyl)ethylene glycol, manufactured by NOF Corporation, trade name "Polycerin DCB-2000", Mw: 4,500 Other polycarbonate copolymers Y1 Production Example 5 Polycarbonate copolymer bisphenol A: polytetramethylene glycol = 15% by mass: 85% by mass Mw: 22,800 Phosphorus stabilizer (C) C1 Bis(2,6-di-tert-butyl-4-methylphenyl)neopentylerythritol diphosphite manufactured by ADEKA Corporation, trade name "ADEKASTAB PEP-36" C2 Ginseng (2,4-di-tert-butylphenyl) phosphite manufactured by ADEKA Corporation, trade name "ADEKASTAB2112" C3 Bis(2,4-dicumylphenyl)neopentylerythritol diphosphite manufactured by Doverchemical Co., trade name "Doverphos S-9228PC" Epoxy or oxetane compound (D) D1 3,4-Epoxycyclohexylmethyl-3',4'-epoxycyclohexanecarboxylate manufactured by Daicel Corporation, trade name "Celloxide 2021P" D2 3-Ethyl-3{[(3-ethyloxetane-3-yl)methoxy]methyl}oxetane manufactured by Toagosei Co., Ltd., trade name "ARON OXETANE OXT - 221" Release agent (E) E1 Glycerol monostearate manufactured by Riken Vitamin Co., brand name "RIKEMAL S-100A"

In addition, in Table 1 above, the polycarbonate copolymers (B1) to (B4) and other polycarbonate copolymers (Y1) were manufactured in accordance with the following manufacturing examples 1 to 5. [Production Example 1 of Polycarbonate Copolymer (B1)] In a polymerization device equipped with a 1L three-necked flask, an equivalent of 85% by mass was added as poly-n-propylene glycol (ie, polypropylene glycol) manufactured by ALLESSA under the trade name "VELVETOL H500""(Mw: 1700), 15% by mass equivalent of bisphenol A, 1.16 diphenyl carbonate in molar ratio to diol. An aqueous solution _{of Cs 2} CO ₃ as a catalyst with 1 mol of diol being 11 μmol (in terms of Cs) was added. After the system was dried for 1 hour, the pressure in the polymerization apparatus was recompressed with nitrogen. After the recompression, the polymerization device is immersed in the oil bath as the start of the polymerization, and proceed according to the heating and decompression program shown in Table 2 below. The final temperature is 217°C and the vacuum pump full vacuum (FV) is reduced to less than 0.13kPaA. Keep under the conditions, and 140 minutes from the start of the polymerization is regarded as the end of the polymerization. The weight average molecular weight (Mw) of the obtained bisphenol A-poly-n-propylene glycol-polycarbonate copolymer (B1) was 15,400.

[Table 2] Time (min) Set temperature (℃) Set pressure (kPaA) 0 200 97 10 200 → 217 97 → 27 20 27 → 24 30 24 → 20 40 20 → 17 50 17 → 13 60 13 → 6 70 6 → 0 140 the end

[Production Example 2 of Polycarbonate Copolymer (B2)] In a polymerization device equipped with a 1L three-necked flask, an equivalent of 85% by mass was added as poly-n-propylene glycol (ie, polypropylene glycol) manufactured by ALLESSA under the trade name "VELVETOL H500""(Mw: 1700), 15% by mass equivalent of bisphenol A, and 1.11 diphenyl carbonate in molar ratio to diol. An aqueous solution _{of Cs 2} CO ₃ that is 5.0 μmol (in terms of Cs) for 1 mol of diol is added as a catalyst. After the system was dried for 1 hour, the pressure in the polymerization apparatus was recompressed with nitrogen. After the recompression, the polymerization device is immersed in the oil bath as the start of polymerization, and proceed according to the heating and decompression program shown in Table 3 below. The final temperature is 217°C and the vacuum pump full vacuum (FV) is reduced to 0.13kPaA or less. The conditions were maintained, and 320 minutes from the start of the polymerization was regarded as the end of the polymerization. The weight average molecular weight (Mw) of the obtained bisphenol A-poly-n-propylene glycol-polycarbonate copolymer (B2) was 18,800.

[table 3] Time (min) Set temperature (℃) Set pressure (kPaA) 0 200 97 10 200 → 217 97 → 27 80 27 → 24 150 24 → 20 190 20 → 17 210 17 → 13 230 13 → 6 250 6 → 0 320 the end

[Manufacturing Example 3 of Polycarbonate Copolymer (B3)] In a polymerization device equipped with a 1L three-necked flask, an equivalent of 85% by mass was added as poly-n-propylene glycol (ie, polypropylene glycol) manufactured by ALLESSA under the trade name "VELVETOL H500""(Mw: 1700), 15% by mass equivalent of bisphenol A, and 1.10 diphenyl carbonate in molar ratio to diol. An aqueous solution _{of Cs 2} CO ₃ that is 4.9 μmol (in terms of Cs) for 1 mol of diol is added as a catalyst. After the system was dried for 1 hour, the pressure in the polymerization apparatus was recompressed with nitrogen. After the recompression, the polymerization device is immersed in the oil bath as the start of polymerization, and proceed according to the heating and decompression program shown in Table 4 below. The final temperature is 217°C and the vacuum pump full vacuum (FV) is reduced to 0.13kPaA or less. The conditions were maintained, and 350 minutes from the start of the polymerization was regarded as the end of the polymerization. The weight average molecular weight (Mw) of the obtained bisphenol A-poly-n-propylene glycol-polycarbonate copolymer (B3) was 22,800.

[Table 4] Time (min) Set temperature (℃) Set pressure (kPaA) 0 200 97 10 200 → 217 97 → 27 80 27 → 24 170 24 → 20 210 20 → 17 230 17 → 13 260 13 → 6 280 6 → 0 350 the end

[Production Example 4 of Polycarbonate Copolymer (B4)] In a polymerization device equipped with a 1L three-necked flask, an equivalent of 85% by mass was added as poly-n-propylene glycol (ie, polypropylene glycol) manufactured by ALLESSA under the trade name "VELVETOL H500""(Mw: 1700), 15% by mass equivalent of bisphenol A, and diphenyl carbonate with a molar ratio of 1.07 relative to diol. An aqueous solution _{of Cs 2} CO ₃ that is 4.9 μmol (in terms of Cs) for 1 mol of diol is added as a catalyst. After the system was dried for 1 hour, the pressure in the polymerization apparatus was recompressed with nitrogen. After the recompression, the polymerization device is immersed in the oil bath as the start of the polymerization, and proceed according to the heating and decompression program shown in Table 5 below, at a final temperature of 217°C and a vacuum pump full vacuum (FV) of less than 0.13kPaA. The conditions were maintained, and 310 minutes from the start of the polymerization was regarded as the end of the polymerization. The weight average molecular weight (Mw) of the obtained bisphenol A-poly-n-propylene glycol-polycarbonate copolymer (B4) was 34,100.

[table 5] Time (min) Set temperature (℃) Set pressure (kPaA) 0 200 97 10 200 → 213 97 → 27 50 27 → 24 60 213 → 217 twenty four 140 24 → 20 180 20 → 17 200 17 → 13 220 13 → 6 240 6 → 0 310 the end

[Production Example 5 of Polycarbonate Copolymer (Y1)] In a polymerization device equipped with a 1L three-necked flask, an equivalent of 85% by mass was added as polytetramethylene glycol, the trade name "PTMG650" manufactured by Mitsubishi Chemical Corporation (Mw: 1950), 15% by mass equivalent of bisphenol A, and 1.15 diphenyl carbonate in molar ratio to diol. An aqueous solution _{of Cs 2} CO ₃ that is 9.9 μmol (in terms of Cs) as a catalyst for 1 mol of diol is added. After the system was dried for 1 hour, the pressure in the polymerization apparatus was recompressed with nitrogen. After the recompression, the polymerization device is immersed in the oil bath as the start of the polymerization. Follow the heating and decompression program shown in Table 6 below. The final temperature is 217°C and the vacuum pump full vacuum (FV) is reduced to less than 0.13kPaA. Keep under the conditions, and 140 minutes from the start of the polymerization is regarded as the end of the polymerization. The weight average molecular weight (Mw) of the obtained bisphenol A-polytetramethylene glycol-polycarbonate copolymer (Y1) was 22,800.

[Table 6] Time (min) Set temperature (℃) Set pressure (kPaA) 0 200 97 10 200 → 217 97 → 27 20 27 → 24 30 24 → 20 40 20 → 17 50 17 → 13 60 13 → 6 70 6 → 0 140 the end

(Examples 1 to 19, Comparative Examples 1 to 5) [Manufacturing of resin composition pellets] The above ingredients are blended in the proportions (parts by mass) listed in the following Table 7-9, mixed with a rolling machine for 20 minutes, and then a single-screw extruder with a vent hole with a screw diameter of 40 mm (manufactured by Tanabe Plastic Machinery Co., Ltd. "VS -40”), set the cylinder temperature to 240°C for melting and kneading, and use strand cutting to obtain pellets.

[Strand transparency at the time of manufacturing resin composition pellets] The transparency of the strands obtained by melt-kneading and extruding with an extruder in the manufacturing step of the above-mentioned resin composition pellets was determined visually based on the following criteria. A: The extruded strand has extremely high transparency, and the compatibility of polycarbonate resin with polycarbonate copolymer (B), polytetramethylene glycol, and other polycarbonate copolymers is extremely good. B: The extruded strand has high transparency, and the compatibility of polycarbonate resin with polycarbonate copolymer (B), polytetramethylene glycol, and other polycarbonate copolymers is good. C: The strand obtained by extrusion is slightly cloudy, and the compatibility of the polycarbonate resin with the polycarbonate copolymer (B), polytetramethylene glycol, and other polycarbonate copolymers is poor. D: Extruded strands are strongly cloudy, and the compatibility of polycarbonate resin with polycarbonate copolymer (B), polytetramethylene glycol, and other polycarbonate copolymers is extremely poor.

[Evaluation of fluidity (Q value)] After the obtained pellets are dried at 120°C for more than 5 hours, the composition is measured at 280°C and a load of 160kgf using a Koka type flow tester according to the method described in Appendix C of JIS K7210 The outflow Q value of the material per unit time (unit: ×10 ^-2 cm ³ /sec), and evaluate the fluidity. In addition, for the orifice, a diameter of 1 mm × a length of 10 mm was used. The higher the Q value, the better the liquidity.

[Impact resistance evaluation (Xiapi impact strength)] After drying the obtained pellets at 120°C for 5 hours, use an injection molding machine (NEX80III manufactured by Nissei Plastic Industries Co., Ltd.) at a cylinder temperature of 250°C and a mold temperature of 80°C. Under the conditions of ℃ and a molding cycle of 45 seconds, an impact resistance test piece with a thickness of 3mm based on ISO179-1 and 2 was produced. The obtained test piece was subjected to notch cutting with R0.25mm/depth of 2mm, and the notched Charpy impact strength (kJ/m ² ) was measured in a temperature environment of 23°C.

[Evaluation of mold contamination (mold adhesion)] Pollution evaluation of injection molding (mold contamination) After drying the pellets obtained above at 120°C for 5 hours, use an injection molding machine ("SE7M" manufactured by Sumitomo Heavy Industries, Ltd.), using a drop-shaped mold as shown in Figure 1, with a cylinder temperature of 340°C, and a molding cycle 10 seconds, the mold temperature is 40 ℃, 200 times of injection molding are performed, and the contamination state caused by the white adhesion on the metal mirror surface on the fixed side of the mold is judged by visual evaluation according to the following criteria. A: There are very few mold attachments, and the mold contamination resistance is extremely good. B: There are few mold attachments, but some mold contamination is observed. C: There are slightly more mold attachments, and mold contamination is observed. D: There are many mold attachments, and mold contamination is conspicuously observed.

In addition, the drop-shaped mold in FIG. 1 is designed to introduce a resin composition from the gate G and generate gas to easily stay at the tip P part. The gate G has a width of 1mm and a thickness of 1mm. In Figure 1, the width h1 is 14.5mm, the length h2 is 7mm, the length h3 is 27mm, and the thickness of the forming part is 3mm.

[Hue (YI) and ΔYI (evaluation of heat discoloration resistance)] After drying the obtained pellets at 120°C in a hot-air circulation dryer for 5-7 hours, they are molded into a long light path using an injection molding machine ("HSP100A" manufactured by Sodick) at a resin temperature of 340°C and a mold temperature of 80°C. Molded product (300mm×7mm×4mm). For this long optical path molded product, the YI (yellowness) was measured at an optical path length of 300mm. For the measurement, a long optical path spectrophotometer ("ASA 1" manufactured by Nippon Denshoku Kogyo Co., Ltd., C light source, 2° field of view) was used. Then, after the long optical path molded product was kept at 95°C for 1000 hours, the YI value was measured at an optical path length of 300 mm, and the difference ΔYI from the initial YI value was obtained, and the thermal discoloration resistance was evaluated.

The above evaluation results are shown in Table 7-9 below.

[Table 7] Example 1 2 3 4 5 6 7 8 9 10 Polycarbonate resin (A) A1 100 80 80 80 80 80 80 80 80 80 A2 20 20 20 20 20 20 20 20 20 A3 A4 Polycarbonate copolymer (B) B1 0.3 B2 0.35 0.35 0.35 0.35 0.35 0.35 0.35 B3 0.35 B4 0.35 Polyalkylene glycol X1 X2 X3 X4 X5 X6 Other polycarbonate copolymers Y1 Phosphorus stabilizer (C) C1 0.05 0.05 0.05 0.05 0.05 0.05 C2 0.05 0.05 0.05 C3 0.05 Epoxy or oxetane compound (D) D1 0.03 0.03 D2 0.03 0.03 Release agent (E) E1 Q value (×10 ^-2 cm ³ /sec) 41.5 48.5 47.2 46.9 48.3 48.8 48.6 48.0 48.7 47.3 Strand transparency A A A A A A A A A A Charpy impact strength with notch (kJ/m ² ) 40 38 33 40 37 36 39 38 35 40 Gas generation during molding (evaluation of mold contamination) A A A A A A A A A A YI(300mm) 19.3 19.5 18.2 19.1 19.0 19.1 20 19.8 20.1 19.5 ΔYI(300mm) 5.8 5.9 5.5 5.3 2.8 3.4 3.3 2.3 2.6 5.0

[Table 8] Example 11 12 13 14 15 16 17 18 19 Polycarbonate resin (A) A1 80 80 80 80 80 80 80 90 A2 20 20 20 20 20 20 20 10 A3 43 A4 57 Polycarbonate copolymer (B) B1 B2 0.35 0.35 0.35 0.35 0.35 0.35 0.35 B3 B4 0.94 0.94 Polyalkylene glycol X1 X2 0.1 X3 X4 0.1 X5 0.1 X6 0.1 Other polycarbonate copolymers Y1 Phosphorus stabilizer (C) C1 0.02 0.02 0.05 0.05 0.05 0.05 0.05 0.05 0.05 C2 0.03 0.03 C3 Epoxy or oxetane compound (D) D1 0.03 D2 0.03 Release agent (E) E1 0.03 Q value (×10 ^-2 cm ³ /sec) 49.1 48.6 47.6 49.8 49.6 50.0 49.7 47.1 68.0 Strand transparency A A A A A A A A A Charpy impact strength with notch (kJ/m ² ) 38 37 40 33 35 29 32 34 30 Gas generation during molding (evaluation of mold contamination) A A A A A A A A A YI(300mm) 19.4 19.6 19.5 18.7 18.8 19.5 18.6 16.5 22.1 ΔYI(300mm) 3.4 4.2 3.7 5.1 4.1 4.0 5.2 3.1 4.0

[Table 9] Comparative example 1 2 3 4 5 Polycarbonate resin (A) A1 95 100 100 100 80 A2 5 20 A3 A4 Polycarbonate copolymer (B) B1 B2 B3 B4 Polyalkylene glycol X1 0.3 X2 0.3 X3 0.3 X4 X5 X6 Other polycarbonate copolymers Y1 0.94 Phosphorus stabilizer (C) C1 0.05 0.05 0.05 0.05 0.05 C2 C3 Epoxy or oxetane compound (D) D1 D2 Release agent (E) E1 Q value (×10 ^-2 cm ³ /sec) 42.0 42.0 42.5 44.1 47.8 Strand transparency A D A A C Impact strength of Charpy with notch (kJ/m ² ) 38 18 15 12 35 Gas generation during molding (evaluation of mold contamination) A B C D A YI(300mm) 28.9 18.7 18.5 18.1 15.2 ΔYI(300mm) 3.0 6.3 6.2 6.1 8.2 [Industrial Utilization]

The polycarbonate resin composition of the present invention has excellent impact resistance, good hue, and excellent transparency, and has very little gas generation and mold contamination during molding. Therefore, it is extremely suitable for use in various molded products, especially optical parts.

h1: wide h2, h3: long G: Gate P: Tip

Fig. 1 is a top view of a drop-type mold used in the evaluation of mold contamination in the embodiment.

Claims (11)

A polycarbonate resin composition, characterized in that: relative to 100 parts by mass of polycarbonate resin (A), it contains: 0.1-10 parts by mass of polycarbonate copolymer (B), consisting of (B1) bisphenol A and ( B2) Poly-n-propylene glycol, which may also have a substituent, is formed by a carbonate bond; and a phosphorus stabilizer (C) 0.005 to 0.5 parts by mass. For example, the polycarbonate resin composition of claim 1, the initial YI value of 300mm optical path length is 25 or less, and the difference between the YI value of 300mm optical path length and the initial YI value (ΔYI) after being kept at 95°C for 1000 hours It is 6 or less. The polycarbonate resin composition of claim 1 or 2, wherein the weight average molecular weight (Mw) of (B2) poly-n-propylene glycol constituting the polycarbonate copolymer (B) is 600-8000. The polycarbonate resin composition of claim 1 or 2, wherein the weight average molecular weight (Mw) of the polycarbonate copolymer (B) is 5,000 to 40,000. Such as the polycarbonate resin composition of claim 1 or 2, wherein the mass ratio of (B1) bisphenol A and (B2) poly-n-propylene glycol constituting the polycarbonate copolymer (B) is as follows: (B1) and (B2) ) Is based on a total of 100% by mass: (B1) is 5% by mass or more and less than 50% by mass, and (B2) is more than 50% by mass and 95% by mass or less. Such as the polycarbonate resin composition of claim 1 or 2, wherein the notched Charpy impact strength of a molded product with a thickness of 3 mm according to ISO 179 is 25 kJ/m ² or more. A molded product is a molded product of the polycarbonate resin composition according to any one of claims 1 to 6. For example, the molded product of claim 7 is an optical component. A polycarbonate resin composition characterized in that it contains 0.001-0.5 parts by mass of stabilizer relative to 100 parts by mass of polycarbonate resin (A), and has an initial YI value of less than 25 at an optical path length of 300 mm. The difference (ΔYI) between the YI value of the 300mm optical path length and the initial YI value after being kept at 95°C for 1000 hours is 6 or less. The polycarbonate resin composition of claim 9, wherein the stabilizer is a phosphorus stabilizer. For example, the polycarbonate resin composition of claim 9 or 10, wherein the notched Charpy impact strength of a molded product with a thickness of 3 mm according to ISO 179 is 25 kJ/m ² or more.

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