JP2018095803A - Polycarbonate resin composition for optical components - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polycarbonate resin composition for optical components that solves the problem of cracking of a molding during a molding process, especially, significantly decrease a rate of cracking even when molding a thin molding at high temperature, has an excellent hue and also has excellent flowability and high light transmittance.SOLUTION: A polycarbonate resin composition for optical components contains, relative to a polycarbonate resin (A) 100 pts.mass, a polyalkylene glycol (B) of 0.1-4 pts.mass, an alkyl alcohol (C) containing no ester or ether group in the structure of 0.005-1 pts.mass, and a phosphorous stabilizer (D) of 0.005-0.5 pts.mass.SELECTED DRAWING: None

Description

  The present invention relates to a polycarbonate resin composition for optical parts, and more particularly to a polycarbonate resin composition for optical parts having a good hue and improved cracking problems during molding.

  A surface light source device is incorporated in a liquid crystal display device used for a personal computer, a cellular phone and the like in order to meet demands for thinning, lightening, labor saving, and high definition. The planar light source device includes a flat light guide plate for the purpose of uniformly and efficiently guiding incident light to the liquid crystal display side.

  Such a light guide plate is obtained by injection molding of a thermoplastic resin. Conventionally, the light guide plate has been molded from a resin material such as polymethylmethacrylate (PMMA). Recently, however, a display device that displays a clearer image has been demanded, and the temperature inside the device is increased by heat generated near the light source. Therefore, it is being replaced with a polycarbonate resin material having higher heat resistance.

  Polycarbonate resin is excellent in mechanical properties, thermal properties, electrical properties, and weather resistance, but its light transmittance is lower than that of PMMA, etc., so that a surface light source body is formed from a light guide plate made of polycarbonate resin and a light source. When configured, there is a problem that the luminance is low. Recently, it has been demanded to reduce the difference in chromaticity between the light incident portion of the light guide plate and a location away from the light incident portion, but there is a problem that the polycarbonate resin is more easily yellowed than the PMMA resin.

Patent Document 1 discloses a method for improving light transmittance and luminance by adding an acrylic resin and an alicyclic epoxy, and Patent Document 2 describes a transfer property of a concavo-convex portion to a light guide plate by modifying a polycarbonate resin terminal. A method for improving the brightness by increasing the brightness, and Patent Document 3 propose a method for improving the brightness by introducing a copolyester carbonate having an aliphatic segment to improve the transferability.
However, although the method of Patent Document 1 improves the hue by adding an acrylic resin, it cannot be increased in light transmittance and brightness due to white turbidity, and the transmittance is improved by adding an alicyclic epoxy. Although there is a possibility, the effect of improving the hue is not recognized. In the case of Patent Document 2 and Patent Document 3, although an improvement effect of fluidity and transferability can be expected, there is a disadvantage that heat resistance is lowered.

On the other hand, it is known in Patent Document 4, Patent Document 5, and the like that polyethylene glycol or poly (2-methyl) ethylene glycol is blended with a thermoplastic resin such as a polycarbonate resin. And in this patent document, the present applicant has the formula: X—O— [CH (—R) —CH ₂ —O] _n —Y (wherein R is a hydrogen atom or an alkyl having 1 to 3 carbon atoms). The proposal which improves the transmittance | permeability and a hue was carried out by mix | blending the polyethyleneglycol or poly (2-alkyl) ethyleneglycol represented by group.

  However, in recent years, various types of mobile terminals such as smartphones and tablet terminals have been made increasingly thin and large-sized, and the required specifications for such high-end light guide plates are increasing. Sophisticated.

JP-A-11-158364 JP 2001-208917 A JP 2001-215336 A JP-A-1-22959 JP-A-9-227785 Japanese Patent No. 4069364

However, the polycarbonate resin composition blended with the polyalkylene glycol as described above is an ultrathin wall having a thickness of, for example, 0.4 mm for a high-end light guide plate, and the molding temperature is as high as 300 ° C. or higher. In addition, the cycle time has been shortened from the viewpoint of productivity, and it has been found that when molding is performed under such conditions, cracking of the molded product frequently occurs during molding.
The subject (object) of this invention is providing the polycarbonate resin composition for optical components in which the problem of the crack of the molded article at the time of shaping | molding was eliminated, having favorable hue.

As a result of intensive investigations to achieve the above-mentioned problems, the present inventors have found that a polycarbonate resin composition in which an alkyl alcohol is blended with a polyalkylene glycol and a phosphorous stabilizer is blended has an excellent hue. However, the present inventors have found that there is no problem of cracking of a molded product at the time of molding, and have completed the present invention.
The present invention relates to the following polycarbonate resin composition for optical parts.

[1] 0.1 to 4 parts by mass of polyalkylene glycol (B) with respect to 100 parts by mass of polycarbonate resin (A), 0.005 to 0.55 of alkyl alcohol (C) not containing an ester group or ether group in the structure A polycarbonate resin composition for optical parts, comprising 1 part by mass and 0.005 to 0.5 parts by mass of a phosphorus stabilizer (D).
[2] The polycarbonate resin composition for optical parts according to [1], further containing 0.0005 to 0.2 parts by mass of the epoxy compound (E) with respect to 100 parts by mass of the polycarbonate resin (A).
[3] The polycarbonate resin composition for optical components according to the above [1] or [2], wherein the molecular weight of the alkyl alcohol (C) is 100 or more and less than 500.
[4] The polycarbonate resin composition for optical parts according to any one of the above [1] to [3], wherein the alkyl alcohol (C) is a monoalcohol.
[5] The polycarbonate resin composition for optical components according to any one of [1] to [4], wherein the polyalkylene glycol (B) has a number average molecular weight of 500 or more and 5000 or less.
[6] An optical component comprising the polycarbonate resin composition for optical components according to any one of [1] to [5].

  The polycarbonate resin composition for optical parts of the present invention is improved in the problem of cracking of a molded product at the time of molding, and particularly when a thin molded product is molded at a high temperature, the crack occurrence rate is remarkably low and has a good hue. Furthermore, it has excellent fluidity and high light transmittance.

Hereinafter, the present invention will be described in detail with reference to embodiments and examples.
In the present specification, “to” is used in the sense of including the numerical values described before and after the lower and upper limits unless otherwise specified.

The polycarbonate resin composition for optical parts of the present invention is 0.1 to 4 parts by mass of polyalkylene glycol (B) with respect to 100 parts by mass of the polycarbonate resin (A), and the alkyl does not contain an ester group or an ether group in the structure. It contains 0.005 to 1 part by mass of alcohol (C) and 0.005 to 0.5 part by mass of phosphorus stabilizer (D).
Hereafter, each component etc. which comprise the polycarbonate resin composition for optical components of this invention are demonstrated in detail.

[Polycarbonate resin (A)]
The polycarbonate resin is a polymer having a basic structure having a carbonic acid bond represented by the formula: — [— O—X—O—C (═O) —] —. In the formula, X is generally a hydrocarbon, but for imparting various properties, X into which a hetero atom or a hetero bond is introduced may be used.

  The polycarbonate resin can be classified into an aromatic polycarbonate resin in which carbon directly bonded to a carbonic acid bond is aromatic carbon and an aliphatic polycarbonate resin in which aliphatic carbon is aliphatic carbon, either of which can be used. Of these, aromatic polycarbonate resins are preferred from the viewpoints of heat resistance, mechanical properties, electrical characteristics, and the like.

  Although there is no restriction | limiting in the specific kind of polycarbonate resin, For example, the polycarbonate polymer formed by making a dihydroxy compound and a carbonate precursor react is mentioned. At this time, in addition to the dihydroxy compound and the carbonate precursor, a polyhydroxy compound or the like may be reacted. Further, a method of reacting carbon dioxide with a cyclic ether using a carbonate precursor may be used. The polycarbonate polymer may be linear or branched. Further, the polycarbonate polymer may be a homopolymer composed of one type of repeating unit or a copolymer having two or more types of repeating units. At this time, the copolymer can be selected from various copolymerization forms such as a random copolymer and a block copolymer. In general, such a polycarbonate polymer is a thermoplastic resin.

Among monomers used as raw materials for aromatic polycarbonate resins, examples of aromatic dihydroxy compounds include:
Dihydroxybenzenes such as 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (ie, resorcinol), 1,4-dihydroxybenzene;
Dihydroxybiphenyls such as 2,5-dihydroxybiphenyl, 2,2′-dihydroxybiphenyl, 4,4′-dihydroxybiphenyl;

2,2′-dihydroxy-1,1′-binaphthyl, 1,2-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, , 7-dihydroxynaphthalene, dihydroxynaphthalene such as 2,7-dihydroxynaphthalene;

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

2,2-bis (4-hydroxyphenyl) propane (ie, 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) naphthylmethane,
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,
Bis (hydroxyaryl) alkanes such as;

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,
Bis (hydroxyaryl) cycloalkanes such as;

9,9-bis (4-hydroxyphenyl) fluorene,
Cardio structure-containing bisphenols such as 9,9-bis (4-hydroxy-3-methylphenyl) fluorene;

4,4′-dihydroxydiphenyl sulfide,
Dihydroxydiaryl sulfides such as 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfide;

Dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide;

4,4′-dihydroxydiphenyl sulfone,
Dihydroxydiaryl sulfones such as 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfone;
Etc.

Among these, bis (hydroxyaryl) alkanes are preferable, and bis (4-hydroxyphenyl) alkanes are particularly preferable, and 2,2-bis (4-hydroxyphenyl) propane (especially from the viewpoint of impact resistance and heat resistance). That is, bisphenol A) is preferred.
In addition, 1 type may be used for an aromatic dihydroxy compound and it may use 2 or more types together by arbitrary combinations and a ratio.

In addition, when an example of a monomer that is a raw material of the aliphatic polycarbonate resin is given,
Ethane-1,2-diol, propane-1,2-diol, propane-1,3-diol, 2,2-dimethylpropane-1,3-diol, 2-methyl-2-propylpropane-1,3- Alkanediols such as diol, butane-1,4-diol, pentane-1,5-diol, hexane-1,6-diol, decane-1,10-diol;

  Cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane-1,4-diol, 1,4-cyclohexanedimethanol, 4- (2-hydroxyethyl) cyclohexanol, 2,2,4, Cycloalkanediols such as 4-tetramethyl-cyclobutane-1,3-diol;

  Glycols such as ethylene glycol, 2,2'-oxydiethanol (ie, diethylene glycol), triethylene glycol, propylene glycol, spiro glycol and the like;

  1,2-benzenedimethanol, 1,3-benzenedimethanol, 1,4-benzenedimethanol, 1,4-benzenediethanol, 1,3-bis (2-hydroxyethoxy) benzene, 1,4-bis ( 2-hydroxyethoxy) benzene, 2,3-bis (hydroxymethyl) naphthalene, 1,6-bis (hydroxyethoxy) naphthalene, 4,4′-biphenyldimethanol, 4,4′-biphenyldiethanol, 1,4- Aralkyl diols such as bis (2-hydroxyethoxy) biphenyl, bisphenol A bis (2-hydroxyethyl) ether, bisphenol S bis (2-hydroxyethyl) ether;

  1,2-epoxyethane (ie ethylene oxide), 1,2-epoxypropane (ie propylene oxide), 1,2-epoxycyclopentane, 1,2-epoxycyclohexane, 1,4-epoxycyclohexane, 1-methyl And cyclic ethers such as -1,2-epoxycyclohexane, 2,3-epoxynorbornane, and 1,3-epoxypropane;

  Among the monomers used as the raw material for the polycarbonate resin, carbonyl halides, carbonate esters and the like are used as examples of the carbonate precursor. In addition, 1 type may be used for a carbonate precursor and it may use 2 or more types together by arbitrary combinations and a ratio.

  Specific examples of carbonyl halides include phosgene; haloformates such as bischloroformate of dihydroxy compounds and monochloroformate of dihydroxy compounds.

  Specific examples of the carbonate ester include diaryl carbonates such as diphenyl carbonate and ditolyl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; biscarbonate bodies of dihydroxy compounds, monocarbonate bodies of dihydroxy compounds, and cyclic carbonates. And carbonate bodies of dihydroxy compounds such as

  The method for producing the polycarbonate resin is not particularly limited, and any method can be adopted. Examples thereof include an interfacial polymerization method, a melt transesterification method, a pyridine method, a ring-opening polymerization method of a cyclic carbonate compound, and a solid phase transesterification method of a prepolymer.

The molecular weight of the polycarbonate resin (A) is preferably a viscosity average molecular weight (Mv) of 10000 to 18000, more preferably 10500 or more, further preferably 11000 or more, particularly preferably 11500 or more, and most preferably 12000 or more. More preferably 17500 or less, further preferably 17000 or less, and particularly preferably 16500 or less. By making the viscosity average molecular weight more than the lower limit of the above range, the mechanical strength of the polycarbonate resin composition of the present invention can be further improved, and by making the viscosity average molecular weight not more than the upper limit of the above range, The fluidity of the polycarbonate resin composition of the invention can be suppressed and improved, and the molding processability can be improved and the thin-wall molding process can be easily performed.
The polycarbonate resin (A) may be used by mixing two or more kinds of polycarbonate resins having different viscosity average molecular weights. In this case, the polycarbonate resin having a viscosity average molecular weight outside the above preferred range is mixed. May be.

In the present invention, the viscosity average molecular weight Mv of the polycarbonate resin is determined by using methylene chloride as a solvent and obtaining an intrinsic viscosity η (unit: dl / g) at a temperature of 20 ° C. using an Ubbelohde viscometer. It means the value calculated from the formula.
η = 1.23 × 10 ⁻⁴ Mv ^0.83
The intrinsic viscosity η is a value calculated from the following equation by measuring the specific viscosity η _sp at each solution concentration [C] (g / dl).

  The polycarbonate resin is a polycarbonate resin alone (the polycarbonate resin alone is not limited to an embodiment containing only one type of polycarbonate resin, and is used in a sense including an embodiment containing a plurality of types of polycarbonate resins having different monomer compositions and molecular weights, for example. .), Or an alloy (mixture) of a polycarbonate resin and another thermoplastic resin may be used in combination. Further, for example, for the purpose of further improving flame retardancy and impact resistance, a polycarbonate resin is copolymerized with an oligomer or polymer having a siloxane structure; for the purpose of further improving thermal oxidation stability and flame retardancy A monomer, oligomer or polymer having a copolymer; a copolymer with a monomer, oligomer or polymer having a dihydroxyanthraquinone structure for the purpose of improving thermal oxidation stability; Copolymers with oligomers or polymers having an olefinic structure; copolymers with polyester resin oligomers or polymers for the purpose of improving chemical resistance; Good.

  Further, in order to improve the appearance of the molded product and improve the fluidity, the polycarbonate resin may contain a polycarbonate oligomer. The viscosity average molecular weight (Mv) of this polycarbonate oligomer is usually 1500 or more, preferably 2000 or more, and is usually 9500 or less, preferably 9000 or less. Furthermore, the polycarbonate ligomer contained is preferably 30% by mass or less of the polycarbonate resin (including the polycarbonate oligomer).

Further, the polycarbonate resin may be not only a virgin raw material but also a polycarbonate resin regenerated from a used product (so-called material-recycled polycarbonate resin).
However, the regenerated polycarbonate resin is preferably 80% by mass or less of the polycarbonate resin, and more preferably 50% by mass or less. Recycled polycarbonate resin is likely to have undergone deterioration such as heat deterioration and aging deterioration, so when such polycarbonate resin is used more than the above range, hue and mechanical properties can be reduced. It is because there is sex.

[Polyalkylene glycol compound (B)]
The polycarbonate resin composition for optical components of the present invention contains 0.1 to 4 parts by mass of the polyalkylene glycol (B) with respect to 100 parts by mass of the polycarbonate resin (A).

  As the polyalkylene glycol (B), various polyalkylene glycols can be used. For example, a branched polyalkylene glycol represented by the following general formula (1) or a linear polyalkylene glycol represented by the following general formula (2) An alkylene glycol is mentioned as a preferable thing. The branched polyalkylene glycol represented by the following general formula (1) or the linear polyalkylene glycol represented by the following general formula (2) may be a copolymer with another copolymer component. Although it is good, it is preferably a homopolymer.

Wherein R represents an alkyl group having 1 to 3 carbon atoms, and X and Y are each independently a hydrogen atom, an aliphatic acyl group having 1 to 23 carbon atoms, an alkyl group having 1 to 23 carbon atoms, carbon An aryl group having 6 to 22 carbon atoms or an aralkyl group having 7 to 23 carbon atoms, and m represents an integer of 10 to 400.
The branched polyalkylene glycol represented by the general formula (1) may be a homopolymer composed of one kind of R or a copolymer composed of different Rs.

(In the formula, X and Y are each independently a hydrogen atom, an aliphatic acyl group having 2 to 23 carbon atoms, an alkyl group having 1 to 23 carbon atoms, an aryl group having 6 to 22 carbon atoms, or 7 to 23 carbon atoms. (Wherein p represents an integer of 2 to 6 and r represents an integer of 6 to 100).
The linear polyalkylene glycol represented by the general formula (2) may be a homopolymer composed of a single p or a copolymer composed of a different p.

  As the branched polyalkylene glycol, in the general formula (1), (2-methyl) ethylene glycol in which X and Y are hydrogen atoms and R is a methyl group or (2-ethyl) ethylene glycol in which an ethyl group is preferable is preferable. .

  As the linear polyalkylene glycol, in general formula (2), X and Y are hydrogen atoms, p is 2, polyethylene glycol, p is 3, polytrimethylene glycol, and p is 4, polytetramethylene. Preferable examples include glycol, polypentamethylene glycol having p of 5, and polyhexamethylene glycol having p of 6, more preferably polytrimethylene glycol and polytetramethylene glycol.

  The polyalkylene glycol (B) is selected from linear alkylene ether units (P1) represented by the following general formula (3) and units represented by the following general formulas (4-1) to (4-4). A polyalkylene glycol copolymer having a branched alkylene ether unit (P2) is also preferred.

(In formula (3), p represents an integer of 2 to 6)
As a linear alkylene ether unit represented by General formula (3), the single unit which consists of 1 type of p, or the several unit which consists of different p may mix.

(In formulas (4-1) to (4-4), R ^{1 to} R ¹⁰ each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and each of formulas (4-1) to (4- In 4), at least one of R ^{1 to} R ¹⁰ is an alkyl group having 1 to 3 carbon atoms.)

  As the linear alkylene ether unit (P1) represented by the general formula (3), when describing it as glycol, ethylene glycol in which p is 2, trimethylene glycol in which p is 3, and tetra in which p is 4 Examples thereof include methylene glycol, pentamethylene glycol having p of 5, and hexamethylene glycol having p of 6, which may be mixed, preferably trimethylene glycol and tetramethylene glycol, and tetramethylene glycol is particularly preferable.

  Trimethylene glycol is industrially obtained by hydroformylating ethylene oxide to obtain 3-hydroxypropionaldehyde and hydrogenating it or hydrogenating 3-hydroxypropionaldehyde obtained by hydrating acrolein with a Ni catalyst. Manufactured by the method. Recently, trimethylene glycol is also produced by reducing glycerin, glucose, starch and the like to microorganisms by a bio method.

  As the branched alkylene ether unit represented by the general formula (4-1), when this is described as glycol, (2-methyl) ethylene glycol, (2-ethyl) ethylene glycol, (2,2-dimethyl) ethylene glycol, etc. These may be mixed, and (2-methyl) ethylene glycol and (2-ethyl) ethylene glycol are preferred.

  As a branched alkylene ether unit represented by the above general formula (4-2), when described as glycol, (2-methyl) trimethylene glycol, (3-methyl) trimethylene glycol, (2-ethyl) trimethylene glycol , (3-ethyl) triethylene glycol, (2,2-dimethyl) trimethylene glycol, (2,2-methylethyl) trimethylene glycol, (2,2-diethyl) trimethylene glycol (ie neopentyl glycol) , (3,3-dimethyl) trimethylene glycol, (3,3-methylethyl) trimethylene glycol, (3,3-diethyl) trimethylene glycol and the like, and these may be mixed.

  As a branched alkylene ether unit represented by the above general formula (4-3), when this is described as glycol, (3-methyl) tetramethylene glycol, (4-methyl) tetramethylene glycol, (3-ethyl) tetramethylene glycol , (4-ethyl) tetramethylene glycol, (3,3-dimethyl) tetramethylene glycol, (3,3-methylethyl) tetramethylene glycol, (3,3-diethyl) tetramethylene glycol, (4,4-dimethyl) ) Tetramethylene glycol, (4,4-methylethyl) tetramethylene glycol, (4,4-diethyl) tetramethylene glycol, and the like. These may be mixed, and (3-methyl) tetramethylene glycol is preferable.

  As a branched alkylene ether unit represented by the above general formula (4-4), when described as glycol, (3-methyl) pentamethylene glycol, (4-methyl) pentamethylene glycol, (5-methyl) pentamethylene glycol , (3-ethyl) pentamethylene glycol, (4-ethyl) pentamethylene glycol, (5-ethyl) pentamethylene glycol, (3,3-dimethyl) pentamethylene glycol, (3,3-methylethyl) pentamethylene glycol (3,3-diethyl) pentamethylene glycol, (4,4-dimethyl) pentamethylene glycol, (4,4-methylethyl) pentamethylene glycol, (4,4-diethyl) pentamethylene glycol, (5,5 -Dimethyl) pentamethylene glycol (5,5-methylethyl) pentamethylene glycol, (5,5-diethyl) such as pentamethylene glycol, and the like, it may also be these mixtures.

  As described above, the units represented by the general formulas (4-1) to (4-4) constituting the branched alkylene ether unit have been described with glycol as an example for convenience. However, the present invention is not limited to these glycols, and these alkylene oxides. Alternatively, these polyether-forming derivatives may be used.

  Preferable examples of the polyalkylene glycol copolymer include a copolymer composed of a tetramethylene ether unit and a unit represented by the general formula (4-3), particularly a tetramethylene ether unit and 3-methyltetramethylene. A copolymer comprising an ether unit is more preferable. Further, a copolymer comprising a tetramethylene ether unit and a unit represented by the general formula (4-1) is also preferable, in particular, a copolymer comprising a tetramethylene ether unit and a 2-methylethylene ether unit, and tetramethylene ether. A copolymer composed of units and 2-ethylethylene ether units is more preferred. Furthermore, a copolymer composed of a tetramethylene ether unit and the above general formula (4-2) is also preferable, and a copolymer composed of a 2,2-dimethyltrimethylene ether unit, that is, a neopentyl glycol ether unit is also preferable.

  The polyalkylene glycol copolymer may be a random copolymer or a block copolymer.

The linear alkylene ether unit (P1) represented by the general formula (3) and the branched alkylene ether unit (P2) represented by the general formulas (4-1) to (4-4) of the polyalkylene glycol copolymer. ) Is a molar ratio of (P1) / (P2), preferably 95/5 to 5/95, more preferably 93/7 to 40/60, and still more preferably 90/10. It is more preferable that the linear alkylene ether unit (P1) is rich.
The mole fraction is measured using a ¹ H-NMR measuring apparatus and deuterated chloroform as a solvent.

  Among the above-mentioned, particularly preferable polyalkylene glycol (B) includes homopolymers such as polytrimethylene glycol, poly (2-methyl) ethylene glycol, poly (2-ethyl) ethylene glycol, polytetramethylene glycol, and polytetramethylene glycol. Methylene glycol-polyethylene glycol, polytetramethylene glycol-polytrimethylene glycol, polytetramethylene glycol-poly (2-methyl) ethylene glycol, polytetramethylene glycol-poly (3-methyl) tetramethylene glycol, polytetramethylene glycol- Poly (2-ethyl) ethylene glycol, polytetramethylene glycol-polyneopentyl glycol, polyethylene glycol-polytrimethylene glycol, polyethylene glycol Le - poly (2-methyl) copolymers such as ethylene glycol.

  Further, as polyalkylene glycol (B), even if one or both ends thereof are blocked with carboxylic acid or alcohol, there is no influence on the performance expression, and esterified products or etherified products can be used in the same manner. Therefore, X and / or Y in the general formulas (1) and (2) is an aliphatic acyl group having 2 to 23 carbon atoms, an alkyl group having 1 to 23 carbon atoms, an aryl group having 6 to 22 carbon atoms, or the number of carbon atoms. It may be a 7-23 aralkyl group.

Examples of the esterified product include fatty acid esters, and 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. Also, those in which some hydrogen atoms are substituted with a substituent such as a hydroxyl group can be used.
The fatty acid constituting the fatty acid ester is a monovalent or divalent fatty acid having 1 to 23 carbon atoms, such as a monovalent saturated fatty acid, specifically formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid. , Enanthic acid, caprylic acid, capric acid, lauric acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, nonadecanoic acid, arachidic acid, behenic acid and monovalent unsaturated fatty acids, specifically, Unsaturated fatty acids such as oleic acid, elaidic acid, linoleic acid, linolenic acid and arachidonic acid, and divalent fatty acids having 10 or more carbon atoms, specifically sebacic acid, undecanedioic acid, dodecanedioic acid, tetradecanedioic acid , Tapsia and decenedioic acid, undecenedioic acid, dodecenedioic acid.
These fatty acids can be used alone or in combination. The fatty acid also includes a fatty acid having one or more hydroxyl groups in the molecule.

  Preferable specific examples of the fatty acid ester of polyalkylene glycol include polypropylene glycol stearate in which R is a methyl group, X and Y are aliphatic acyl groups having 18 carbon atoms in general formula (1), R is a methyl group, X And polypropylene glycol behenate in which Y is an aliphatic acyl group having 22 carbon atoms. Preferable specific examples of fatty acid esters of linear polyalkylene glycol include polyalkylene glycol monopalmitate, polyalkylene glycol dipalmitate, polyalkylene glycol monostearate, polyalkylene glycol distearate, polyalkylene glycol (Monopalmitic acid / monostearic acid) ester, polyalkylene glycol behenate and the like.

  The alkyl group constituting the alkyl ether of the polyalkylene glycol may be either linear or branched, for example, carbon number such as methyl group, ethyl group, propyl group, butyl group, octyl group, lauryl group, stearyl group, etc. Examples of such a polyalkylene glycol include alkylmethyl ether, ethyl ether, butyl ether, lauryl ether, stearyl ether and the like of polyalkylene glycol.

  The aryl group constituting the aryl ether of the polyalkylene glycol is preferably an aryl group having 6 to 22 carbon atoms, more preferably 6 to 12 carbon atoms, still more preferably 6 to 10 carbon atoms, such as a phenyl group or tolyl. Group, naphthyl group and the like, and phenyl group, tolyl group and the like are preferable. In addition, even if the end-capping group is an aralkyl group, it exhibits good compatibility with polycarbonate, so that it can exhibit the same action as an aryl group. The aralkyl group preferably has 7 to 23 carbon atoms. An aralkyl group having 7 to 13 carbon atoms, more preferably 7 to 11 carbon atoms is preferable, and examples thereof include a benzyl group and a phenethyl group, and a benzyl group is particularly preferable.

The number average molecular weight of the polyalkylene glycol (B) is preferably 500 to 5000, more preferably 600 or more, further preferably 700 or more, more preferably 4000 or less, still more preferably 3000 or less, particularly preferably. 2000 or less. Exceeding the upper limit of the above range is not preferable because the compatibility is lowered, and if it is lower than the lower limit of the above range, gas is easily generated during molding, which is not preferable.
The number average molecular weight of the polyalkylene glycol is a number average molecular weight calculated based on the hydroxyl value measured in accordance with JIS K1577.

  Polyalkylene glycol (B) may be used individually by 1 type, or may use 2 or more types together.

  The content of the polyalkylene glycol (B) is 0.1 to 4 parts by mass with respect to 100 parts by mass of the polycarbonate resin (A) as described above, preferably 0.15 parts by mass or more, more preferably 0.2 parts by mass or more, more preferably 0.25 parts by mass or more, preferably 3.5 parts by mass or less, more preferably 3 parts by mass or less, still more preferably 2.5 parts by mass or less, especially 2 parts by mass. Hereinafter, it is particularly preferably 1.5 parts by mass or less, and particularly preferably 1 part by mass or less.

[Alkyl alcohol (C) containing no ester group or ether group in the structure]
The polycarbonate resin composition for optical parts of the present invention contains an alkyl alcohol (C) that does not contain an ester group or an ether group in the structure.
The alkyl alcohol (C) used in the present invention is not limited as long as it does not contain an ester group or an ether group in the structure, and it is an alcohol having a valence of 4 or more, whether it is divalent or trivalent. However, it is preferably a monovalent monoalcohol.

The molecular weight of the alkyl alcohol (C) is preferably 100 or more and less than 500.
The alkyl group constituting the alkyl alcohol (C) may be linear and branched, and is preferably a saturated alkyl group. The alkyl group preferably has 8 to 40 carbon atoms, more preferably 8 to 30, more preferably 8 to 26, and particularly preferably 10 to 26. When the alkyl group has less than 8 carbon atoms, volatile components may adhere to the mold during molding, and bubbles are easily generated in the molded product, which is not preferable.

  Specific examples of the alkyl group include octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, cetyl group, heptadecyl group, octadecyl group, nonadecyl group, aralkyl group, heicosanyl group, Examples include behenyl group, lignoceryl group, seryl group, heptacosanyl group, montanyl group, nonacosanyl group, myricyl group, etc., undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, cetyl group, heptadecyl group, octadecyl group, nonadecyl group Group, aralkyl group, henicosanyl group, and behenyl group are preferable, and branched groups thereof are also preferable.

  Specific examples of preferable alkyl alcohol (C) include, for example, capryl alcohol (octanol), lauryl alcohol (dodecyl alcohol), myristyl alcohol (tetradecyl alcohol), cetanol (palmityl alcohol), hexyl decanol, stearyl alcohol (octadecyl alcohol), Examples include isostearyl alcohol, arachidyl alcohol, octyldodecanol, behenyl alcohol, and lignoceryl alcohol.

  Content of alkyl alcohol (C) is 0.005-1 mass part with respect to 100 mass parts of polycarbonate resin (A), Preferably it is 0.01 mass part or more, More preferably, it is 0.02 mass part or more, More preferably, it is 0.03 mass part or more, Preferably it is 0.7 mass part or less, More preferably, it is 0.5 mass part or less, More preferably, it is 0.4 mass part or less. When the content of the alkyl alcohol (C) is less than 0.005 parts by mass, the effect of improving the cracking of the molded product at the time of molding becomes insufficient, and when it exceeds 1 part by mass, the cracking rate is deteriorated.

[Phosphorus stabilizer (D)]
The polycarbonate resin composition for optical parts of the present invention further contains a phosphorus stabilizer. By containing the polyalkylene glycol (B), the above alkyl alcohol (C) and the phosphorus stabilizer (D) in combination, the hue of the polycarbonate resin composition of the present invention is further improved, and the heat discoloration resistance is improved. Further improve.
Any known phosphorous stabilizer can be used. Specific examples include phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, polyphosphoric acid; acidic pyrophosphate metal salts such as acidic sodium pyrophosphate, acidic potassium pyrophosphate, and acidic calcium pyrophosphate; phosphoric acid Phosphates of Group 1 or Group 2B metals such as potassium, sodium phosphate, cesium phosphate, and zinc phosphate; phosphate compounds, phosphite compounds, phosphonite compounds and the like can be mentioned, and phosphite compounds are particularly preferred. By selecting a phosphite compound, a polycarbonate resin composition having higher discoloration resistance and continuous productivity can be obtained.

Here, the phosphite compound is a trivalent phosphorus compound represented by the general formula: P (OR) ₃ , and R represents a monovalent or divalent organic group.
Examples of such phosphite compounds include triphenyl phosphite, tris (monononylphenyl) phosphite, tris (monononyl / dinonyl phenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphine. Phyto, monooctyl diphenyl phosphite, dioctyl monophenyl phosphite, monodecyl diphenyl phosphite, didecyl monophenyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, distearyl pentaerythritol diphosphite, Bis (2,4-di-tert-butyl-4-methylphenyl) pentaerythritol phosphite, bis (2,6-di-tert-butylphenyl) octyl phosphite, 2,2-methylene (4,6-di-tert-butylphenyl) octyl phosphite, tetrakis (2,4-di-tert-butylphenyl) -4,4′-biphenylene-diphosphite, 6- [3- (3-tert- Butyl-hydroxy-5-methylphenyl) propoxy] -2,4,8,10-tetra-tert-butyldibenzo [d, f] [1,3,2] -dioxaphosphine.

  Among such phosphite compounds, an aromatic phosphite compound represented by the following formula (5) or (6) is more preferable because the heat discoloration of the polycarbonate resin composition of the present invention is effectively enhanced.

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

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

  As the phosphite compound represented by the above formula (5), triphenyl phosphite, tris (monononylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite and the like are preferable. Tris (2,4-di-tert-butylphenyl) phosphite is more preferred. Specific examples of such organic phosphite compounds include, for example, “ADEKA STAB 1178” manufactured by ADEKA, “SUMILIZER TNP” manufactured by Sumitomo Chemical Co., Ltd., “JP-351” manufactured by Johoku Chemical Industry Co., Ltd., “ADEKA STAB manufactured by ADEKA 2112 "," Irgaphos 168 "manufactured by BASF," JP-650 "manufactured by Johoku Chemical Industry Co., Ltd., and the like.

  Examples of the phosphite compound represented by the above formula (6) include bis (2,4-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite and bis (2,6-di-tert-butyl). Those having a pentaerythritol diphosphite structure such as -4-methylphenyl) pentaerythritol diphosphite and bis (2,4-dicumylphenyl) pentaerythritol diphosphite are particularly preferred. Specific examples of such an organic phosphite compound include “Adeka Stub PEP-24G”, “Adeka Stub PEP-36” manufactured by Adeka, “Doverphos S-9228” manufactured by Doverchemical, and the like.

Among the phosphite compounds, the aromatic phosphite compound represented by the above formula (6) is more preferable because the hue is more excellent.
In addition, 1 type may contain phosphorus stabilizer and 2 or more types may contain it by arbitrary combinations and a ratio.

  Content of a phosphorus stabilizer (D) is 0.005-0.5 mass part with respect to 100 mass parts of polycarbonate resin (A), Preferably it is 0.007 mass part or more, More preferably, it is 0.00. 008 parts by mass or more, particularly preferably 0.01 parts by mass 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, particularly 0 .1 part by mass or less. When the content of the phosphorus stabilizer (D) is less than 0.005 parts by mass, the hue and the heat discoloration are insufficient, and when it exceeds 0.5 parts by mass, the heat discoloration is only deteriorated. In addition, the wet heat stability is also reduced.

[Epoxy compound (E)]
It is also preferable that the resin composition of the present invention further contains an epoxy compound (E). By containing the epoxy compound (E) together with the components (B), (C), and (D), the heat discoloration can be further improved.

As the epoxy compound (E), a compound having one or more epoxy groups in one molecule is used. Specifically, phenyl glycidyl ether, allyl glycidyl ether, t-butylphenyl glycidyl ether, 3,4-epoxycyclohexylmethyl-3 ′, 4′-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl -3 ', 4'-epoxy-6'-methylcyclohexyl carboxylate, 2,3-epoxycyclohexylmethyl-3', 4'-epoxycyclohexyl carboxylate, 4- (3,4-epoxy-5-methylcyclohexyl) Butyl-3 ′, 4′-epoxycyclohexylcarboxylate, 3,4-epoxycyclohexylethylene oxide, cyclohexylmethyl 3,4-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-6 ′ -Methylsiloxyl carboxylate, bisphenol-A diglycidyl ether, tetrabromobisphenol-A glycidyl ether, diglycidyl ester of phthalic acid, diglycidyl ester of hexahydrophthalic acid, bis-epoxy dicyclopentadienyl ether, bis- Epoxyethylene glycol, bis-epoxycyclohexyl adipate, butadiene diepoxide, tetraphenylethylene epoxide, octyl epoxytalate, epoxidized polybutadiene, 3,4-dimethyl-1,2-epoxycyclohexane, 3,5-dimethyl-1,2, -Epoxycyclohexane, 3-methyl-5-t-butyl-1,2-epoxycyclohexane, octadecyl-2,2-dimethyl-3,4-epoxycyclohexylcarboxy N-butyl-2,2-dimethyl-3,4-epoxycyclohexyl carboxylate, cyclohexyl-2-methyl-3,4-epoxycyclohexyl carboxylate, N-butyl-2-isopropyl-3,4-epoxy -5-methylcyclohexyl carboxylate, octadecyl-3,4-epoxycyclohexylcarboxylate, 2-ethylhexyl-3 ', 4'-epoxycyclohexylcarboxylate, 4,6-dimethyl-2,3-epoxycyclohexyl-3', 4′-epoxycyclohexylcarboxylate, 4,5-epoxytetrahydrophthalic anhydride, 3-tert-butyl-4,5-epoxytetrahydrophthalic anhydride, diethyl 4,5-epoxy-cis-1,2-cyclohexyldicarboxylate Rate, j-n-b Le -3-t-butyl-4,5-epoxy - cis-1,2-cyclohexyl dicarboxylate, epoxidized soybean oil, can be preferably exemplified such as epoxidized linseed oil.
Epoxy compounds may be used alone or in combination of two or more.

  Of these, alicyclic epoxy compounds are preferably used, and 3,4-epoxycyclohexylmethyl-3 ', 4'-epoxycyclohexylcarboxylate is particularly preferable.

  The preferable content of the epoxy compound (E) is 0.0005 to 0.2 parts by mass with respect to 100 parts by mass of the polycarbonate resin (A), more preferably 0.001 parts by mass or more, and still more preferably 0.00. 003 parts by mass or more, 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.

[Additives, etc.]
The polycarbonate resin composition for optical parts of the present invention is made of other additives other than those described above, such as mold release agents, antioxidants, ultraviolet absorbers, fluorescent brighteners, pigments, dyes, and polycarbonate resins. It can contain additives such as polymers, flame retardants, impact modifiers, antistatic agents, plasticizers, compatibilizers and the like. These additives may be used alone or in combination of two or more.

[Production Method of Polycarbonate Resin Composition]
There is no restriction | limiting in the manufacturing method of the polycarbonate resin composition for optical components of this invention, The manufacturing method of a well-known polycarbonate resin composition can be employ | adopted widely, and polycarbonate resin (A), polyalkylene glycol (B), alkyl alcohol (C) And phosphorus stabilizer (D), and other components to be blended as needed, for example, using various mixers such as a tumbler or Henschel mixer, then Banbury mixer, roll, Brabender, uniaxial Examples thereof include a melt kneading method using a kneading extruder, a twin screw kneading extruder, a kneader or the like. The temperature for melt kneading is not particularly limited, but is usually in the range of 240 to 320 ° C.

  The polycarbonate resin composition of the present invention can produce various molded articles by molding pellets obtained by pelletizing the above-described polycarbonate resin composition by various molding methods. Further, the resin melt-kneaded by an extruder can be directly molded into a molded product without going through the pellets.

The polycarbonate resin composition of the present invention is improved in the problem of cracking of a molded product at the time of molding, particularly when a thin molded product is molded at a high temperature, the crack occurrence rate is remarkably low, and has a good hue. Since it has excellent fluidity and high light transmittance, it is suitably used for molding optical parts, particularly thin-walled optical parts by injection molding. The resin temperature at the time of injection molding is preferably molded at a resin temperature higher than 260 to 300 ° C., which is a temperature generally applied to the injection molding of polycarbonate resin, particularly in the case of a thin molded product. A resin temperature of ˜400 ° C. is preferred. The resin temperature is preferably 310 ° C. or higher, more preferably 315 ° C. or higher, particularly preferably 320 ° C. or higher, and more preferably 390 ° C. or lower. When the conventional polycarbonate resin composition is used, there is a problem that when the resin temperature at the time of molding is increased in order to mold a thin molded product, the molded product is likely to be yellowed. By using the composition, it becomes possible to produce a molded product having a good hue, particularly a thin-walled optical component, even in the above temperature range. In addition, reducing the molecular weight of the polycarbonate resin in order to form a thin molded product has been conventionally performed, but the polycarbonate resin composition of the present invention has good fluidity, so that it can be molded without reducing the molecular weight. Thus, a molded product having higher strength can be obtained.
The resin temperature is grasped as the barrel set temperature when it is difficult to directly measure the resin temperature.

  Here, the thin-walled molded article refers to a molded article having a plate-like portion with a thickness of usually 1 mm or less, preferably 0.8 mm or less, more preferably 0.6 mm or less. Here, the plate-like portion may be a flat plate or a curved plate, may be a flat surface, may have irregularities on the surface, and the cross section has an inclined surface. Or a wedge-shaped cross section.

Examples of the optical parts include parts of devices and instruments that directly or indirectly use light sources such as LEDs, organic EL, incandescent bulbs, fluorescent lamps, and cathode tubes.
Optical parts using the polycarbonate resin composition for optical parts of the present invention can be suitably used in the fields of liquid crystal backlight units, various display devices, and lighting devices. Examples of such devices include mobile phones, mobile notebooks, netbooks, slate PCs, tablet PCs, smartphones, tablet terminals, and other portable terminals, cameras, watches, notebook computers, various displays, lighting devices, and the like. It is done.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not construed as being limited to the following examples.
The raw materials and evaluation methods used in the following examples and comparative examples are as follows.

(Examples 1-13, Comparative Examples 1-4)
[Production of resin composition pellets]
Each component described in Table 1 was blended in the proportions (parts by mass) shown in Table 2 below, mixed for 20 minutes with a tumbler, and then a single screw extruder with a vent with a screw diameter of 40 mm (manufactured by Tanabe Plastic Machinery Co., Ltd.). “VS-40”) was melt-kneaded at a cylinder temperature of 240 ° C., and pellets were obtained by strand cutting.

[Measurement of Hue (YI)]
The obtained pellets were dried at 120 ° C. for 5 to 7 hours with a hot air circulating dryer, and then with an injection molding machine (“EC100SX-2A” manufactured by Toshiba Machine Co., Ltd.) at a resin temperature of 340 ° C. and a mold temperature of 80 ° C. A long optical path molded product (300 mm × 7 mm × 4 mm) was molded.
About this long optical path molded product, YI (yellowing degree) was measured at an optical path length of 300 mm. For the measurement, a long optical path spectral transmission color meter (“ASA 1” manufactured by Nippon Denshoku Industries Co., Ltd., C light source, 2 ° visual field) was used.

[Molded product cracking rate (unit:%)]
The obtained pellets were dried at 120 ° C. for 5 to 7 hours with a hot-air circulating dryer, and then injected with an injection molding machine (“HSP100A” manufactured by Sodick) at a resin temperature of 380 ° C. and a mold temperature of 60 ° C., 112 mm × 100 molded articles of 61 mm × 0.4 mm were molded. The number of molded products with cracks during molding was counted, and the crack generation rate (%) was calculated.
The above evaluation results are shown in Table 2 below.

  The polycarbonate resin composition for optical parts of the present invention is improved in the problem of cracking of a molded product at the time of molding, and particularly when a thin molded product is molded at a high temperature, the crack occurrence rate is remarkably low and has a good hue. Furthermore, since it is a polycarbonate resin material having excellent fluidity and high light transmittance, it can be suitably used for various optical components.

Claims (6)

  0.1 to 4 parts by mass of polyalkylene glycol (B) and 0.005 to 1 part by mass of alkyl alcohol (C) containing no ester group or ether group in the structure with respect to 100 parts by mass of the polycarbonate resin (A) A polycarbonate resin composition for optical parts, containing 0.005 to 0.5 parts by mass of a phosphorus stabilizer (D).   Furthermore, the polycarbonate resin composition for optical components of Claim 1 which contains an epoxy compound (E) 0.0005-0.2 mass part with respect to 100 mass parts of polycarbonate resin (A).   The polycarbonate resin composition for optical components according to claim 1 or 2, wherein the molecular weight of the alkyl alcohol (C) is 100 or more and less than 500.   The polycarbonate resin composition for optical parts according to any one of claims 1 to 3, wherein the alkyl alcohol (C) is a monoalcohol.   The polycarbonate resin composition for optical components according to any one of claims 1 to 4, wherein the number average molecular weight of the polyalkylene glycol (B) is 500 or more and 5000 or less.   An optical component comprising the polycarbonate resin composition for an optical component according to claim 1.