JP2000281888A - Polycarbonate resin composition, optical component and method for producing the same - Google Patents

Abstract

(57) [Summary] The following general formula (1-a) and general formula (1)
A resin composition containing a polycarbonate copolymer containing the structural unit represented by -b) and an aliphatic compound, an optical component obtained by molding the resin composition, and a method for producing the same. (Wherein, R ₁ represents an alkyl group, an alkoxy group, a nitro group or a halogen atom, R ₂ and R ₃ represent a hydrogen atom or an alkyl group, R ₄ represents an alkyl group, an alkoxy group or a halogen atom, and k represents 0 to 3) Is an integer of 0 to 2) Effect: The resin composition is excellent in melt fluidity, retention stability, mold release property and the like at the time of molding processing, and the molded article obtained therefrom has transparency. It is excellent in mechanical properties, heat resistance, etc. and has low birefringence, so that it is useful for optical components such as optical disc substrates, pickup lenses, plastic substrates for liquid crystal cells, prisms, and optical fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polycarbonate resin composition containing a polycarbonate copolymer containing a specific repeating unit and an aliphatic compound, and further relates to an optical resin obtained by molding the resin composition. The present invention relates to a component and a method for manufacturing the same. The resin composition of the present invention is excellent in transparency, mechanical properties, heat resistance, etc., and has low birefringence, and further has good melt fluidity, retention heat stability, mold release properties and good moldability. It is useful for optical components such as optical disk substrates, pickup lenses, plastic substrates for liquid crystal cells, prisms, and optical fibers.

[0002]

2. Description of the Related Art Polycarbonate is widely used as an engineering plastic in the fields of automobiles, electricity, and optics. At present, polycarbonates widely used are usually produced from 2,2-bis (4'-hydroxyphenyl) propane (hereinafter referred to as bisphenol A) and carbonyl halide compounds such as phosgene. Polycarbonate produced from bisphenol A is a resin having well-balanced properties such as transparency, heat resistance, low moisture permeability, impact resistance, and dimensional stability, and is widely used. Particularly in recent years, it has been used in the field of optical components such as optical disk substrates. In an optical disk used as an information recording medium, since a laser beam passes through the disk main body, the disk substrate is of course transparent, and optical homogeneity is strongly required to reduce reading errors. .

[0003] However, for example, bisphenol A
When using polycarbonate manufactured from a resin substrate, the laser beam is generated by thermal stress, molecular orientation, residual stress due to volume change near the glass transition point, etc., generated during the cooling and flowing processes of the resin during molding of the disk substrate. When passing through, birefringence occurs. The large optical non-uniformity due to the birefringence is a fatal defect for an optical component such as an optical disk substrate, for example, causing an error in reading recorded information. Further, because the polycarbonate has a high viscosity at the time of melting, for example,
There is a problem in moldability such as it is very difficult to obtain a disk substrate having a smaller pit diameter by injection molding in order to increase the recording density.

[0004] As a method of solving such a problem,
Various new polymers have been proposed, for example, spirobiindanol alone in folicarbonate or a copolymerized polycarbonate of spirobiindanol and bisphenol A (Japanese Patent Application Laid-Open No. 63-314235). However, although the former polycarbonate has low birefringence, it has poor transparency and mechanical strength, for example, cracks are formed in a molded product during molding, and thus has a practical problem. Further, the latter polycarbonate, as the content of bisphenol A increases, transparency and mechanical properties are improved, but the birefringence increases,
There has been a problem in using it as an optical component such as an information recording medium as described above. Further, these polycarbonates have a somewhat lower viscosity at the time of melting than polycarbonates manufactured from existing bisphenol A, but have the above-mentioned discs for information recording media that require the precision workability described above. In practice, it is difficult to say that the substrate has sufficient melt fluidity to obtain by injection molding the substrate,
The solution of these problems has been strongly desired.

The present inventors have overcome the above problems and have good transparency, mechanical properties, heat resistance, etc. useful for optical parts, low birefringence, and As a resin having good fluidity and excellent moldability, a polycarbonate copolymer containing a repeating structural unit represented by the following general formulas (1-a) and (2-a) has been found, Application has already been filed (Japanese Patent Application No. Hei 10-110361)
issue).

As described above, in order to form a high recording density disk substrate or the like having a narrower track width and a shorter track length, it is necessary to enhance transferability.
In order to prevent errors in recording / reading / writing, it is necessary to further reduce birefringence. When the releasability of the resin is poor, not only the transferability is deteriorated, but also the stress is applied and the distortion remains, thereby increasing the birefringence. Therefore, it has been required to improve the releasability of the resin.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned problems, to have excellent transparency, mechanical properties, heat resistance, etc., to have a low birefringence, and to obtain a melt fluidity during molding. An object of the present invention is to provide a polycarbonate resin composition which is excellent in residence stability and mold release properties and can be molded at lower temperatures, an optical component obtained by molding the polycarbonate resin composition, and a method for producing the same.

[0008]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention. That is, the present invention relates to a polycarbonate copolymer containing a repeating structural unit represented by the following general formulas (1-a) and (2-a) (formula 2), and 100% by weight of the copolymer. The present invention relates to a polycarbonate resin composition containing 0.0005 to 5 parts by weight of an aliphatic compound per part by weight.

[0009]

Embedded image (Wherein, R ₁ each independently represents an alkyl group, an alkoxy group, a nitro group or a halogen atom, R ₂ and R ₃ each independently represent a hydrogen atom or an alkyl group, R ₄ each independently represent an alkyl group, Represents an alkoxy group or a halogen atom, k independently represents an integer of 0 to 3, and 1 represents each independently an integer of 0 to 2)

In the present invention, the polycarbonate copolymer may be present in an amount of from 5 to 90 mol% in the total repeating structural units represented by the general formulas (1-a) and (2-a). The weight average molecular weight of the above resin composition containing the repeating structural unit represented by 1-a) is 100.
Wherein the polycarbonate resin composition is from 00 to 150,000, an optical component obtained by molding any of the resin compositions of the above-mentioned, in producing an optical component using the resin composition of any of the above- The present invention relates to a method for producing an optical component, wherein injection molding is performed at a resin temperature of 240 to 360 ° C and a mold temperature of 50 to 150 ° C.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The polycarbonate resin composition of the present invention contains a polycarbonate copolymer containing a repeating structural unit represented by the general formula (1-a) and the general formula (2-a), and an aliphatic compound. It is characterized by the following. The polycarbonate copolymer used in the resin composition of the present invention (hereinafter also referred to as the polycarbonate copolymer of the present invention) comprises a dihydroxy compound represented by the general formula (1) (formula 3) and a general formula (2) ) Which is obtained by reacting a dihydroxy compound represented by the formula (3) with a carbonate precursor to copolymerize the compound, and which is derived from a compound represented by the general formula (1) and a carbonate precursor. Both a repeating structural unit represented by the formula (1-a) and a repeating structural unit represented by the general formula (2-a) derived from the compound represented by the general formula (2) and a carbonate precursor It is a copolymer having a repeating structural unit as an essential repeating structural unit, and may be any of a random copolymer, an alternating copolymer, and a block copolymer.

[0012]

Embedded image (Wherein R ₁ , R ₂ , R ₃ , R ₄ , k and l are the same as above)

Among these polycarbonate copolymers, considering the balance of various properties such as heat resistance and mechanical properties, all repeating structural units represented by the general formulas (1-a) and (2-a) The proportion of the repeating structural unit represented by the general formula (1-a) contained therein is preferably from 5 to 5.
90 mol%, more preferably 10 to 80 mol%
And more preferably 20 to 70 mol%.

In the general formula (1-a), R ₁ each independently represents an alkyl group, an alkoxy group, a nitro group or a halogen atom, preferably a linear, branched or cyclic group which may have a substituent. Represents an alkyl group, a linear, branched or cyclic alkoxy group, a nitro group or a halogen atom which may have a substituent, preferably a straight-chain having 1 to 20 carbon atoms which may have a substituent. It is a chain, branched or cyclic alkyl group, a linear, branched or cyclic alkoxy group having 1 to 20 carbon atoms which may have a substituent, a nitro group or a halogen atom.

Preferably, R ₁ is an unsubstituted straight-chain or branched alkyl group having 1 to 10 carbon atoms, an unsubstituted straight-chain or branched alkoxy group having 1 to 10 carbon atoms or a chlorine atom. Represents a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, a methoxy group, an ethoxy group, and n
-A propoxy group, an isopropoxy group, an n-butoxy group,
It is an isobutoxy group, a tert-butoxy group or a chlorine atom. As the substituent R _1, a methyl group or a chlorine atom is particularly preferred. In the general formula (1-a), k independently represents an integer of 0 to 3, preferably 0,
It is 1 or 2, more preferably 0 or 1. As k, the integer 0 is particularly preferred.

In the general formula (2-a), R ₂ and R
₃ each independently represents a hydrogen atom or an alkyl group. R ₂ and R ₃ are preferably a hydrogen atom or a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, more preferably a hydrogen atom or a linear alkyl group having 1 to 4 carbon atoms. Yes, a methyl group is particularly preferred as R ₂ and R ₃ .

R ₄ each independently represents an alkyl group, an alkoxy group or a halogen atom, preferably a straight-chain, branched or cyclic alkyl group which may have a substituent, Represents a straight-chain, branched or cyclic alkoxy group or a halogen atom, preferably a straight-chain having 1 to 20 carbon atoms which may have a substituent,
It represents a branched or cyclic alkyl group, a linear, branched or cyclic alkoxy group having 1 to 20 carbon atoms which may have a substituent or a halogen atom.

Preferably, R ₄ is an unsubstituted linear or branched alkyl group having 1 to 10 carbon atoms, an unsubstituted linear or branched alkoxy group having 1 to 10 carbon atoms, or a fluorine or chlorine atom. More preferably, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group, methoxy group,
Ethoxy, n-propoxy, isopropoxy, n
- butoxy, isobutoxy, tert- butoxy group, a fluorine atom or a chlorine atom, as a substituent R _4, a methyl group, a fluorine atom is particularly preferred. In the general formula (2-a), 1 independently represents an integer of 0 to 2, and is preferably 0 or 1. As l
The integer 0 is particularly preferred.

In the repeating structural unit represented by the general formula (1-a), the substitution position of the carbonate bond is 4, 5 or 4 on the benzene ring in the spirobiindane structure, respectively.
It is at position 6 or 7, or at position 4 ', 5', 6 'or 7'.
Among the repeating structural units represented by the general formula (1-a), a repeating structural unit represented by the following formula (1-a-A) (formula 4) is also represented by a general formula (2-a). Among the repeating structural units represented by the following formula (2-a-A)
The repeating structural unit represented by the formula (4) is particularly preferable.

[0020]

Embedded image (Wherein R ₁ , R ₂ , R ₃ , R ₄ , k and l are the same as above)

As described above, the polycarbonate copolymer according to the present invention is obtained by allowing the dihydroxy compound represented by the general formula (1) and the dihydroxy compound represented by the general formula (2) to act on a carbonate precursor. It is obtained by copolymerization (Japanese Patent Application No. 10-110361).
The dihydroxy compound represented by the general formula (1) and the dihydroxy compound represented by the general formula (2) are known compounds, respectively, and are preferably produced by a known method. The dihydroxy compound represented by the general formula (1) can be prepared by a known method, for example, a method described in JP-A-62-10030, that is, 2,2-bis (4-hydroxyphenyl) propane is converted to perfluoroalkane sulfone. It is preferably produced by a method of performing a heat treatment in the presence of an acid. The dihydroxy compound represented by the general formula (2) can be prepared by a known method, for example, a method described in JP-B-8-13770, that is, α, α in the presence of an acid catalyst such as an ion exchange resin. It is preferably produced by a method of reacting a compound such as' -dihydroxydiisopropylbenzene or diisopropenylbenzene with a phenol.

Examples of the method for producing the polycarbonate copolymer according to the present invention include various known polycarbonate polymerization methods [for example, Experimental Chemistry Course, 4th Edition, (28) Polymer Synthesis, pp. 231-242, Maruzen Publishing (1988) ), For example, a solution polymerization method, a transesterification method, or an interfacial polymerization method] is used. Typically, a dihydroxy compound represented by the general formula (1) and a dihydroxy compound represented by the general formula (2) are added to a carbonate precursor (for example, a diester carbonate compound such as dimethyl carbonate, diethyl carbonate, or diphenyl carbonate, or phosgene). And the like) are used.

Although the molecular weight of the polycarbonate copolymer according to the present invention is not particularly limited, the weight average molecular weight is usually a molecular weight in terms of standard polystyrene measured by GPC (gel permeation chromatography). 5,000 to 200,000, preferably 10,000 to 150,000, and more preferably 15,000 to 120,000. The polydispersity index expressed as a ratio between the weight average molecular weight and the number average molecular weight is not particularly limited, but is preferably 1.5 to 20.0, more preferably 2. 0 to 15.0, and more preferably,
2.0 to 10.0.

The polycarbonate copolymer according to the present invention is a repeating unit represented by the general formula (1-a) or (2-a), and comprises a plurality of different repeating structural units. It may be a polymer. Also, a polycarbonate containing another repeating structural unit other than the repeating structural unit represented by the general formula (1-a) or the general formula (2-a) as long as the desired effects of the present invention are not impaired. It may be a copolymer.

Formula (1-a) or Formula (2-a)
The other repeating structural unit other than the repeating structural unit represented by is a repeating structural unit derived from another dihydroxy compound other than the dihydroxy compound represented by the general formula (1) or (2), Examples of the dihydroxy compound include various known aromatic dihydroxy compounds or aliphatic dihydroxy compounds.

Specific examples of the aromatic dihydroxy compound include bis (4-hydroxyphenyl) methane,
1,1-bis (4′-hydroxyphenyl) ethane, 1,2-bis (4′-hydroxyphenyl) ethane, bis (4-hydroxyphenyl) phenylmethane, bis (4-hydroxyphenyl) diphenylmethane, bis (4 -Hydroxyphenyl) -1-naphthylmethane, 1,1-bis (4′-hydroxyphenyl) -1-phenylethane, 2,2-bis (4′-hydroxyphenyl) propane [“bisphenol A”], 2- (4'-
Hydroxyphenyl) -2- (3′-hydroxyphenyl) propane, 2,2-bis (4′-hydroxyphenyl) butane,
1,1-bis (4'-hydroxyphenyl) butane, 2,2-bis (4'-hydroxyphenyl) -3-methylbutane, 2,2-bis (4'-hydroxyphenyl) pentane, 3,3-bis (4'-hydroxyphenyl) pentane, 2,2-bis (4'-hydroxyphenyl) hexane, 2,2-bis (4'-hydroxyphenyl) octane, 2,2-bis (4'-hydroxyphenyl)- 4-methylpentane, 2,2-bis (4'-hydroxyphenyl) heptane, 4,4-bis (4'-hydroxyphenyl) heptane, 2,
2-bis (4'-hydroxyphenyl) tridecane, 2,2-bis (4'-hydroxyphenyl) octane, 2,2-bis (3'-
Methyl-4'-hydroxyphenyl) propane, 2,2-bis (3'-ethyl-4'-hydroxyphenyl) propane,
2-bis (3'-n-propyl-4'-hydroxyphenyl)
Propane, 2,2-bis (3'-isopropyl-4'-hydroxyphenyl) propane, 2,2-bis (3'-sec-butyl-4'-hydroxyphenyl) propane, 2,2-bis (3 ' −
tert-butyl-4′-hydroxyphenyl) propane, 2,2-bis (3′-cyclohexyl-4′-hydroxyphenyl) propane, 2,2-bis (3′-allyl-4′-hydroxyphenyl) propane, 2,2-bis (3'-methoxy-4 '
-Hydroxyphenyl) propane, 2,2-bis (3 ', 5'-dimethyl-4'-hydroxyphenyl) propane, 2,2-bis (2', 3 ', 5', 6'-tetramethyl-4 '-Hydroxyphenyl) propane, bis (4-hydroxyphenyl) cyanomethane, 1-cyano-3,3-bis (4'-hydroxyphenyl) butane, 2,2-bis (4'-hydroxyphenyl) hexafluoropropane, etc. Bis (hydroxyaryl) alkanes of

1,1-bis (4'-hydroxyphenyl) cyclopentane, 1,1-bis (4'-hydroxyphenyl) cyclohexane, 1,1-bis (4'-hydroxyphenyl) cycloheptane, 1,1 -Bis (3'-methyl-4'-hydroxyphenyl) cyclohexane, 1,1-bis (3 ', 5'-dimethyl-
4'-hydroxyphenyl) cyclohexane, 1,1-bis (3 ', 5'-dichloro-4'-hydroxyphenyl) cyclohexane, 1,1-bis (3'-methyl-4'-hydroxyphenyl) -4- Methylcyclohexane, 1,1-bis (4'-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 2,
2-bis (4'-hydroxyphenyl) norbornane, 2,2-
Bis (hydroxyaryl) cycloalkanes such as bis (4'-hydroxyphenyl) adamantane, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,
Bis (hydroxyaryl) ethers such as 3'-dimethyldiphenylether and ethylene glycol bis (4-hydroxyphenyl) ether, 4,4'-dihydroxydiphenylsulfide, 3,3'-dimethyl-4,4'-dihydroxydiphenylsulfide , 3,3'-Dicyclohexyl-
Bis (hydroxyaryl) sulfides such as 4,4'-dihydroxydiphenyl sulfide and 3,3'-diphenyl-4,4'-dihydroxydiphenyl sulfide;

Bis (hydroxyaryl) sulfoxides such as 4,4'-dihydroxydiphenylsulfoxide and 3,3'-dimethyl-4,4'-dihydroxydiphenylsulfoxide, 4,4'-dihydroxydiphenylsulfone, 4,4 ' -
Bis (hydroxyaryl) sulfones such as dihydroxy-3,3'-dimethyldiphenylsulfone, bis (4-hydroxyphenyl) ketone, bis (4-hydroxy-3-
Bis (hydroxyaryl) ketones such as methylphenyl) ketone, and 7,7′-dihydroxy-3,3 ′,
4,4'-tetrahydro-4,4,4 ', 4'-tetramethyl-2,2'-spirobi (2H-1-benzopyran), trans-2,3-bis (4'-hydroxyphenyl) -2 -Butene, 9,9-bis (4'-hydroxyphenyl) fluorene, 3,3-bis (4 '
-Hydroxyphenyl) -2-butanone, 1,6-bis (4'-
Hydroxyphenyl) -1,6-hexanedione, α, α,
α ', α'-tetramethyl-α, α'-bis (4-hydroxyphenyl) -p-xylene, α, α, α', α'-
Tetramethyl-α, α′-bis (4-hydroxyphenyl) -m-xylene, 4,4′-dihydroxybiphenyl, hydroquinone, resorcin and the like. Further, an aromatic dihydroxy compound containing an ester bond which can be produced, for example, by reacting 2 mol of bisphenol A with 1 mol of isophthaloyl chloride or terephthaloyl chloride is also useful.

Specific examples of the aliphatic dihydroxy compound include 1,2-dihydroxyethane, 1,3-dihydroxypropane, 1,4-dihydroxybutane and 1,5-dihydroxybutane.
Dihydroxypentane, 3-methyl-1,5-dihydroxypentane, 1,6-dihydroxyhexane, 1,7
-Dihydroxyheptane, 1,8-dihydroxyoctane, 1,9-dihydroxynonane, 1,10-dihydroxydecane, 1,11-dihydroxyundecane, 1,
12-dihydroxydodecane, dihydroxyneopentyl, 2-ethyl-1,2-dihydroxyhexane, 2-
Dihydroxyalkanes such as methyl-1,3-dihydroxypropane, 1,3-dihydroxycyclohexane,
Examples thereof include dihydroxycycloalkanes such as 1,4-dihydroxycyclohexane and 2,2-bis (4′-hydroxycyclohexyl) propane. Further, o-dihydroxyxylylene, m-dihydroxyxylylene, p-dihydroxy Xylylene, 1,4-bis (2′-hydroxyethyl) benzene, 1,4-bis (3′-hydroxypropyl) benzene, 1,4-bis (4′-hydroxybutyl) benzene, 1,4-bis (5′-hydroxypentyl) benzene, 1,4-bis (6′-hydroxyhexyl) benzene, 2,2-bis [4 ′-(2 ″ -hydroxyethyloxy) phenyl]
Examples include dihydroxy compounds such as propane.

Further, as a repeating structural unit other than the repeating structural unit represented by the general formula (1-a) or (2-a), two repeating units other than the above-mentioned dihydroxy compound are used.
It may contain a repeating structural unit derived from a functional compound. That is, examples of the bifunctional compound other than the dihydroxy compound include compounds such as aromatic dicarboxylic acids, aliphatic dicarboxylic acids, aromatic diamines, aliphatic diamines, aromatic diisocyanates, and aliphatic diisocyanates. By using these bifunctional compounds, in addition to the carbonate group, an imino group, an ester group, an ether group, an imide group, an amide group, a urethane group, a polycarbonate copolymer containing a group such as a urea group is obtained, The present invention also includes such a polycarbonate copolymer.

Formula (1-a) or Formula (2-a)
When other repeating structural units other than the repeating structural unit represented by are contained, the general formula (1)
The proportion occupied by the repeating structural units represented by -a) and the general formula (2-a) is not particularly limited as long as the desired effect of the present invention is not impaired.
Mol% or more, preferably 70 mol% or more, more preferably 90 mol% or more. In order to obtain the maximum effect of the present invention, only the repeating structural units represented by the general formulas (1-a) and (2-a) are contained without containing other repeating structural units. Copolymers are particularly preferred.

In the polycarbonate copolymer according to the present invention, the terminal group is a hydroxy group, a haloformate group,
It may be a reactive terminal group such as a carbonate group, or may be an inert terminal group sealed with a molecular weight regulator. The amount of the terminal group in the polycarbonate copolymer according to the present invention is not particularly limited, but is usually 0.001 to 10 mol%, preferably 0.01 to 10 mol%, based on the total number of moles of the structural units. 5 mol%, more preferably 0.1 mol%.
1 to 3 mol%.

When the polycarbonate copolymer according to the present invention is produced by polymerization according to the above-mentioned method, it is preferable to carry out the polymerization in the presence of a molecular weight regulator for the purpose of controlling the molecular weight. Such a molecular weight regulator is not particularly limited, and may be any of various known molecular weight regulators used in a known polycarbonate polymerization.
For example, monovalent hydroxyaliphatic compounds or hydroxyaromatic compounds or derivatives thereof (eg, monovalent hydroxyaliphatic compounds or alkali metal or alkaline earth metal salts of hydroxyaromatic compounds, monovalent hydroxyaliphatic compounds or A haloformate compound of a hydroxyaromatic compound, a monovalent hydroxyaliphatic compound or a carbonate of a hydroxyaromatic compound, a monovalent carboxylic acid or a derivative thereof (eg, an alkali metal or alkaline earth metal of a monovalent carboxylic acid) Salts, acid halides of monovalent carboxylic acids, esters of monovalent carboxylic acids, and the like). The amount of the molecular weight modifier used is not particularly limited, and may be used as desired to adjust the molecular weight to a target. Usually, the amount is 0.001 to 10 based on the total number of moles of the dihydroxy compound to be polymerized. Mol%
And preferably 0.01 to 5 mol%.

The resin composition of the present invention is characterized by containing the above-mentioned polycarbonate copolymer of the present invention and an aliphatic compound. The aliphatic compound contained in the resin composition of the present invention is added to 100 parts by weight of the polycarbonate copolymer containing the repeating structural units represented by the general formulas (1-a) and (2-a). On the other hand, the content is 0.0005 to 5 parts by weight, preferably 0.1 to 5 parts by weight.
001 to 3 parts by weight, more preferably 0.01 to 2 parts by weight.

The aliphatic compound used in the present invention is a compound having an aliphatic chain, which is a compound containing no aromatic chain, and the aliphatic chain may be linear, branched or cyclic. The aliphatic compound includes a halogen atom, a carboxyl group, an alkylcarbonyl group, an alkoxycarbonyl group, an aminocarbonyl group, an alkylaminocarbonyl group, a hydroxyl group, an alkoxy group, a cyano group, a nitro group, an amino group, an aminoalkyl group, and a sulfo group. It may be substituted with a group or the like. Further, among these substituents, two or more same or different substituents may be contained in the molecule.

When the compound has a substituent, the substituent and the metal may form a salt. As the aliphatic compound,
Preferably, an unsubstituted aliphatic compound or a compound substituted with a carboxyl group, an alkylcarbonyl group, an alkoxycarbonyl group, an aminocarbonyl group, an alkylaminocarbonyl group, a hydroxyl group, an alkoxy group, or the like, wherein the substituent and the metal form a salt And the like. More preferably, a carboxyl group, an alkylcarbonyl group,
It is a compound substituted with an alkoxycarbonyl group, an aminocarbonyl group, an alkylaminocarbonyl group, a hydroxyl group, an alkoxy group, or the like, or a compound in which the substituent and a metal form a salt.

Preferred specific examples include aliphatic hydrocarbons, fatty acid compounds, fatty acid ester compounds, fatty acid metal salt compounds, fatty acid amide compounds, fatty alcohols, and the like. More preferably, fatty acid compounds, fatty acid ester compounds, fatty acid It is a metal salt compound, a fatty acid amide compound or an aliphatic alcohol. Known compounds can be used as the aliphatic compound.

Examples of the aliphatic hydrocarbon include liquid paraffin, montan wax, beeswax, low-polymerized polyethylene,
And hydrogenated polybutene. Specific examples of the fatty acid compound include linear saturated fatty acids, cyclic saturated fatty acids, branched saturated fatty acids, unsaturated fatty acids, and unsaturated fatty acids having a hydroxyl group. Examples of the C ₆ -C ₃₂ linear saturated fatty acids include caproic acid (C ₆ ), enanthic acid (C ₇ ), caprylic acid (C ₈ ), pelargonic acid (C ₉ ), capric acid (C ₁₀ ), Undecylic acid (C ₁₁ ), lauric acid (C ₁₂ ), tridecylic acid (C ₁₃ ), myristic acid (C ₁₄ ), pentadecylic acid (C
₁₅ ), palmitic acid (C ₁₆ ), heptadecylic acid (C ₁₇ ), stearic acid (C ₁₈ ), nonadecanoic acid (C ₁₉ ), arachidic acid (C ₂₀ ), henicosanoic acid (C ₂₁ ), behenic acid (C ₂₂ ), trichosanoic acid (C ₂₃ ), lignoceric acid (C ₂₄ ), pentacosanoic acid (C ₂₅ ), cellotic acid (C ₂₆ ), heptacosanoic acid (C ₂₇ ), montanic acid (C ₂₈ ), nonacosanoic acid (C ₂₉₎ ), Melisic acid (C ₃₀ ), hentriacontanic acid (C ₃₁ ), laccelic acid (C ₃₂ ) and the like.

Examples of the cyclic saturated fatty acid include naphthenic acid and the like, examples of the branched saturated fatty acid include 2-ethylhexoic acid, isodecanoic acid, and the like, and examples of the unsaturated fatty acid include oleic acid, elaidic acid, cetreic acid, and erucic acid. Acids, pracidic acid, sorbic acid, linoleic acid, linolenic acid, arachidonic acid and the like can be mentioned, and unsaturated fatty acids having a hydroxyl group include ricinoleic acid. The fatty acid compound is preferably a C ₁₁ -C ₂₂ linear saturated fatty acid, naphthenic acid, oleic acid, erucic acid, sorbic acid, linoleic acid, linolenic acid or ricinoleic acid, and more preferably undecylic acid (C ₁₁ ), lauric acid (C ₁₂ ), tridecylic acid (C ₁₃ ), myristic acid (C
₁₄ ), palmitic acid (C ₁₆ ), stearic acid (C ₁₈ ),
Behenic acid (C ₂₂ ), oleic acid, erucic acid or sorbic acid, more preferably myristic acid (C _22
14 ), palmitic acid (C ₁₆ ), stearic acid (C ₁₈ ),
Behenic acid (C ₂₂ ), and particularly preferably stearic acid (C ₁₈ ).

Examples of the fatty acid ester compound include ester compounds of the above-mentioned fatty acids and alcohols. As the alcohol, a straight-chain monovalent alcohols C ₁ -C _22, include a polyhydric alcohol. Specific examples of C ₁ -C ₂₂ linear monohydric alcohols include methanol, ethanol, propanol, butanol, pentyl alcohol, hexyl alcohol, heptyl alcohol, octyl alcohol, nonyl alcohol, decyl alcohol (C ₁₀ ), undecyl alcohols (C _11), lauryl alcohol (C _12), tridecyl alcohol (C _13), myristyl alcohol (C _14), pentadecyl alcohol (C _15), cetyl alcohol (C _16), heptadecyl alcohol (C ₁₇₎ , stearyl alcohol (C _18), nonadecyl alcohol (C _19), eicosyl alcohol (C _20), and the like.

Examples of polyhydric alcohols include glycerin, sorbitol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol,
Tripropylene glycol, polypropylene glycol, trimethylolpropane, pentaerythritol,
1,3-butanediol and the like. In the case of an ester of a monovalent fatty acid and a polyhydric alcohol, y (y is an integer of 1 or more and x or less) of x hydroxyl groups of the x-valent alcohol form an ester bond, and (x- y) hydroxyl groups may remain as they are.

Specific examples include stearyl undecylate, stearyl laurate, stearyl tridecylate,
Stearyl myristate, stearyl palmitate, butyl stearate, lauryl stearate, butyl arachidate, butyl behenate, butyl oleate, pentaerythritol tetrastearate, ethylene glycol monostearate, polyethylene glycol dilaurate, polyethylene glycol monooleate, Polyethylene glycol dioleate, butyl ricinoleate, glycerin monocaprylate, glycerin monocaprate, glycerin monolaurate, glycerin monomyristate, glycerin monopalmitate, glycerin monostearate, glycerin monooleate, glycerin monoelcate, glycerin Monolinoleate, glycerin trilaurate, glycerin trimiristate,
Glycerin tripalmitate, glycerin tristearate, glycerin trioleate and the like can be mentioned.

The fatty acid ester compound is preferably stearyl laurate, stearyl myristate,
Stearyl palmitate, butyl stearate, pentaerythritol tetrastearate, ethylene glycol monostearate, polyethylene glycol dilaurate, polyethylene glycol monooleate, glycerin monopalmitate, glycerin monostearate, more preferably stearyl laurate, myristine Stearyl acid, stearyl palmitate, ethylene glycol monostearate, polyethylene glycol dilaurate, polyethylene glycol monooleate,
Glycerin monostearate, more preferably stearyl myristate, stearyl palmitate, ethylene glycol monostearate, and glycerin monostearate, particularly preferably glycerin monostearate.

Examples of the fatty acid metal salt compounds include salts of the above-mentioned fatty acids with the following metals. As metal,
Examples include lithium, magnesium, calcium, strontium, barium, zinc, cadmium, aluminum, tin, and lead, preferably calcium and zinc, and particularly preferably calcium. Specific examples of the fatty acid metal salt compound include lithium stearate, magnesium stearate, calcium stearate, calcium laurate, calcium ricinoleate,
Strontium stearate, barium stearate,
Barium laurate, barium ricinoleate, cadmium stearate, cadmium laurate, cadmium ricinoleate, cadmium naphthenate, cadmium 2-ethylhexoate, zinc stearate, zinc laurate, zinc ricinoleate, 2-ethylhexoate, lead stearate And lead naphthenate. Preferred are magnesium stearate, calcium stearate and zinc stearate, more preferred are calcium stearate and zinc stearate, and particularly preferred is calcium stearate.

As the fatty acid amide compound, RCONH
Compounds represented by _2, RCONH-CH ₂ -NHCOR
A methylenebisamide compound represented by
Ethylenebis amide represented by NH-CH ₂ CH ₂ -NHCOR, and the like, an amide compound obtained carboxylic acid compound and each represented by RCOOH, ammonia, diamine, ethylenediamine. As the carboxylic acid compound represented by RCOOH,
The above-mentioned fatty acids are exemplified. Specific examples of the fatty acid amide compound include palmitylamide, stearylamide, oleylamide, methylenebisstearamide, ethylenebisstearamide, and the like, preferably palmitylamide and stearylamide, and stearylamide. Is more preferred.

As the aliphatic alcohol, monohydric alcohol
And polyhydric alcohols. Monohydric alcohol
Then C₈~ C₃₂Straight chain monohydric alcohols,
As a specific example, octyl alcohol (C₈), Nonyl
Alcohol (C₉), Decyl alcohol (C_Ten)
Decyl alcohol (C₁₁), Lauryl alcohol
(C ₁₂), Tridecyl alcohol (C₁₃), Myristille
Alcohol (C₁₄), Pentadecyl alcohol
(C_Fifteen), Cetyl alcohol (C₁₆), Heptadecylua
Lucor (C₁₇), Stearyl alcohol (C₁₈) 、 ノ
Nadecyl alcohol (C₁₉), Eicosyl alcohol
(C₂₀), Seryl alcohol (C₂₆), Merisil Arco
(C₃₀) And the like.

As the polyhydric alcohol, glycerin, sorbitol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol,
Tripropylene glycol, polypropylene glycol, trimethylolpropane, pentaerythritol,
1,3-butanediol and the like.

Preferred are C ₈ -C ₂₀ linear monohydric alcohols, glycerin, ethylene glycol, diethylene glycol and polyethylene glycol, more preferably nonyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, glycerin. , Ethylene glycol, diethylene glycol and polyethylene glycol, more preferably cetyl alcohol and stearyl alcohol, and stearyl alcohol is particularly preferred.

Among the aliphatic compounds used in the present invention,
Preferably, C ₁₁ -C ₂₂ linear saturated fatty acids, naphthenic acid, oleic acid, erucic acid, sorbic acid, linoleic acid,
Linolenic acid or ricinoleic acid (fatty acid compound), stearyl laurate, stearyl myristate, stearyl palmitate, butyl stearate, pentaerythritol tetrastearate, ethylene glycol monostearate, polyethylene glycol dilaurate,
Polyethylene glycol monooleate, glycerin monopalmitate, glycerin monostearate (fatty acid ester compound), magnesium stearate, calcium stearate, zinc stearate (fatty acid metal salt compound), palmitylamide, stearylamide (fatty acid amide compound), linear monohydric alcohols C ₈ -C _20, glycerin, ethylene glycol, diethylene glycol, polyethylene glycol (fatty alcohol).

More preferably, undecylic acid (C ₁₁ ),
Lauric acid (C _12), tridecyl acid (C _13), myristic acid (C _14), palmitic acid (C _16), stearic acid (C _18), behenic acid (C _22), oleic acid, erucic acid or sorbic, Acid (fatty acid compound), stearyl laurate, stearyl myristate, stearyl palmitate, ethylene glycol monostearate, polyethylene glycol dilaurate, polyethylene glycol monooleate, glycerin monostearate (fatty acid ester compound), magnesium stearate, calcium stearate , Zinc stearate (fatty acid metal salt compound), palmitylamide, stearylamide (fatty acid amide compound), nonyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol , Glycerin, an ethylene glycol, diethylene glycol, polyethylene glycol (fatty alcohol), more preferably, myristic acid (C _14), palmitic acid (C _16), stearic acid (C _18), behenic acid (C ₂₂₎ ( Fatty acid compound), stearyl myristate, stearyl palmitate, ethylene glycol monostearate, glycerin monostearate (fatty acid ester compound), calcium stearate, zinc stearate (fatty acid metal salt compound), stearylamide (fatty acid amide compound), cetyl Alcohol, stearyl alcohol (aliphatic alcohol), particularly preferably stearic acid (fatty acid compound),
Glycerin monostearate (fatty acid ester compound), calcium stearate (fatty acid metal salt compound)
It is. The aliphatic compounds contained in the resin composition of the present invention can be used alone or in combination of two or more.

The method for producing the polycarbonate resin composition of the present invention is not particularly limited, and can be generally carried out by various known methods for producing a resin composition.
(1) After the polymerization reaction, after adding and mixing the above-mentioned aliphatic compound to a polycarbonate solution obtained through a post-treatment / purification step, the polymer is converted into a solid (for example, powder or pellets). Separation method (solution blending method), (2) Once the polycarbonate is isolated as a solid from the polycarbonate solution, the aliphatic compound is added to the solid, and further, various known mixing devices (for example, (3) Dispersion and mixing with a turn bull mixer, Henschel mixer, ribbon blender, super mixer, etc., or (3) as described above, after dispersing and mixing with various mixers, melt-kneading with an extruder, Banbury mixer, roll, etc. And the like. Also, these methods may be used in combination.

The polycarbonate resin composition of the present invention comprises:
To the extent that the desired effects of the present invention are not impaired, at the time of production or molding, further known various additives, for example, ultraviolet absorbers, lubricants, organic halogen compound flame retardants, pigments, dyes, flow improvers , An antistatic agent, a filler (calcium carbonate, clay, silica, glass fiber, glass beads, carbon fiber, etc.) and the like can be added together.
In particular, it is preferable to add an antioxidant or a heat stabilizer (for example, phenol type, hindered phenol type, phosphite type, sulfur type, metal phosphate, metal phosphite).

The polycarbonate resin composition of the present invention comprises:
As long as the desired effect is not impaired, it can be used as a molding material by blending it with an aromatic polycarbonate derived from 2,2-bis (4'-hydroxyphenyl) propane during production or molding. is there.
Further, it can be used as a molding material in combination with another polymer. Other polymers include polyethylene, polypropylene, polystyrene, ABS resin, polymethyl methacrylate, polytrifluoroethylene, polytetrafluoroethylene, polyacetal, polyphenylene oxide, polybutylene terephthalate,
Examples include polyethylene terephthalate, polyamide, polyimide, polyamideimide, polyetherimide, polysulfone, polyethersulfone, paraoxybenzoyl-based polyester, polyarylate, and polysulfide.

The polycarbonate resin composition of the present invention is thermoplastic and can be subjected to injection molding, extrusion molding, blow molding, impregnation into fillers and the like in a molten state.
It can be easily molded by various known molding methods such as compression molding and solution casting. The polycarbonate resin composition of the present invention can be used as a molding material for chassis and housing materials for electric equipment, etc., electronic components, automobile parts, substrates for information recording media such as optical disks, optical materials such as lenses for cameras and glasses, and building materials in place of glass. Etc. can be formed. In particular, the polycarbonate resin composition of the present invention has excellent transparency, mechanical properties, heat resistance, low birefringence, and excellent melt fluidity, and is therefore a molding material for various optical components. Very useful as.

The optical components of the present invention include various optical components such as optical recording medium substrates such as optical disk substrates and magneto-optical disk substrates, optical lenses such as pickup lenses, plastic substrates for liquid crystal cells, and prisms. These optical components can be obtained by molding the resin composition of the present invention using various conventionally known molding methods as described above (typically,
It can be suitably manufactured by molding by injection molding or the like. The polycarbonate copolymer according to the present invention has a characteristic that it has low birefringence and good fluidity at the time of melting as compared with general-purpose bisphenol A polycarbonate, and can be molded at a relatively low temperature. It becomes possible.

The optical component of the present invention has a resin temperature of 220 to 3
It can be manufactured by molding at a temperature of 80 ° C and a mold temperature of 40 to 160 ° C. A preferred method for producing the optical component of the present invention is a resin temperature of 240 to 360 ° C and a mold temperature of 5 ° C.
It is a method of injection molding in the range of 0 to 150 ° C, more preferably, a resin temperature of 250 to 340 ° C and a mold temperature of 60 to
140 ° C., and even more preferably, a resin temperature of 26 ° C.
0-330 ° C, mold temperature 70-130 ° C.

If the resin temperature during molding is too high, decomposition and coloring of the resin become unavoidable, and the transparency is reduced. On the other hand, if the resin temperature is too low, sufficient melt fluidity cannot be obtained, or the transferability of the mold becomes poor,
There are problems such as an increase in birefringence. Further, if the mold temperature at the time of molding is too high, problems such as a large deformation at the time of mold release occur, and if it is too low, problems such as a large birefringence of the obtained optical component occur. The optical component of the present invention thus obtained has low birefringence and various performances (for example, optical recording characteristics as an optical disc,
Durability) and very useful.

[0058]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples. The physical properties of the polycarbonate copolymers produced in the following Production Examples and Comparative Production Examples were measured by the following methods. [Measurement of molecular weight] A 0.2% by weight chloroform solution of a polycarbonate copolymer was subjected to GPC (gel permeation chromatography) [Sys, manufactured by Showa Denko KK]
tem-11], weight average molecular weight (Mw)
I asked. The measured value is a value in standard polystyrene conversion. [Melt viscosity] Shimadzu Koka type flow tester (CFT500
A) was measured using an orifice with a load of 100 kg and a diameter of 0.1 cm and a length of 1 cm using A).

Production Example 1 A stirrer equipped with a lattice blade, a reflux condenser, and a dip tube for blowing phosgene (carbonyl chloride) were provided in a baffled flask having a content of 2 liters. In this flask, 154 g of 6,6′-dihydroxy-3,3,3 ′, 3′-tetramethyl-1,1′-spirobiindane represented by the following formula (1-1) (Formula 5) as a raw material monomer ( 0.5 mol)
And 173 g (0.5 mol) of α, α′-bis (4-hydroxyphenyl) -1,3-diisopropylbenzene represented by the following formula (2-1) (formula 5), 112 g of sodium hydroxide (2 .8 mol), 4-tert.
An aqueous solution was prepared by charging 5.16 g (3.43 mol% to diol component) of butylphenol and 1.2 liters of deionized water. Then, the aqueous solution
Add liter of dichloromethane to make a two-phase mixture,
While stirring the two-phase mixture, phosgene 1 was added to the mixture.
19 g (1.2 mol) were fed at a feed rate of 10 g / min.

[0060]

Embedded image

After the supply of phosgene was completed, 0.16 g of triethylamine was added to the reaction mixture, and the mixture was further stirred and mixed for 90 minutes. Thereafter, the stirring was stopped, the reaction mixture was separated, the dichloromethane phase was neutralized with an aqueous hydrochloric acid solution, and washed with deionized water until no electrolyte was substantially detected in the aqueous washing solution. Thereafter, dichloromethane is evaporated from the dichloromethane phase by evaporation to obtain the following formulas (1-a-1) and (2-a-1).
A polycarbonate copolymer (random copolymer) containing a repeating structural unit represented by the formula was obtained as a white powdery solid. The weight average molecular weight was 54,000. With a scanning calorimeter (DSC-3100, manufactured by Mac Science), 0
Differential thermal analysis was performed at a temperature in the range of ° C to 300 ° C. The melt viscosity at 240 ° C. was 4,600 poise.

[0062]

Embedded image

¹ H-NMR (400%) of a 1% by weight solution of the obtained polycarbonate copolymer in deuterated chloroform.
MHz) are shown below. ¹ H-NMR δ (CDCl ₃ ): 1.3 (s, 12
H), 1.4 (s, 12H), 2.3 (m, 8H),
3.9-4.5 (m, 8H), 6.3-7.2 (m, 1
2H) IR (KBr method): 1780 cm ^-1 [-OC (=
O) -O-] In the above-mentioned ¹ H-NMR measurement, the integral ratio between the methyl group on the spiroobiindane ring and the methyl group contained in the isopropylidene group was determined, whereby the formula (1) in the obtained polycarbonate copolymer was obtained. It was confirmed that the molar ratio of the repeating structural unit represented by -a-1) to the repeating structural unit represented by formula (2-a-1) was 50:50.

Comparative Production Example 1 A known polycarbonate was produced from bisphenol A and phosgene according to a conventional method (interfacial polymerization method). That is,
A 2-liter baffled flask was equipped with a stirrer equipped with a lattice blade, a reflux condenser, and a dip tube for blowing phosgene. In this flask, 114 g (0.50 mol)
Of bisphenol A, 56 g (1.40 mol) of sodium hydroxide, 2.58 g of 4-tert-butylphenol and 600 ml of deionized water were prepared to prepare an aqueous solution. Thereafter, 600 ml of dichloromethane was added to the aqueous solution to form a two-phase mixture. While stirring the two-phase mixture, 59.4 g (0.6%) was added to the mixture.
0 mol) of phosgene at a feed rate of 9.9 g / min. After the supply of phosgene was completed, 0.08 g of triethylamine was added to the reaction mixture, and the mixture was further stirred and mixed for 90 minutes. Stirring was then stopped, the reaction mixture was separated, the dichloromethane phase was neutralized with aqueous hydrochloric acid, and washed with deionized water until substantially no electrolyte was detected in the aqueous wash. Thereafter, dichloromethane was evaporated from the dichloromethane phase by distillation to obtain a solid aromatic polycarbonate. Weight average molecular weight is 5100
The melt viscosity at 300 ° C. was 5,400 poise.

Comparative Production Example 2 A polycarbonate copolymer of bisphenol A and spirobiindanol (molar ratio: 50:50) was produced according to the method described in Example 7 of JP-A-63-314235. The weight average molecular weight is 44,800 and 280 ° C.
Was 4,800 poise.

Example 1 100 parts by weight of the polycarbonate copolymer produced in Production Example 1 and 0.1 part by weight of calcium stearate were mixed in a Henschel mixer, and then mixed with a single screw extruder (65 mm). Was obtained.

Example 2 In Preparation Example 1, 100 parts by weight of a dichloromethane solution of a polycarbonate copolymer washed with deionized water until no electrolyte was substantially detected in an aqueous washing solution (polymer concentration: 22% by weight, That is, 0.22 parts by weight of stearyl alcohol (1 part by weight with respect to 100 parts by weight of the polymer solid) was added to 22 parts by weight of the polymer solid, and the mixture was stirred at room temperature for 30 minutes. Thereafter, the same operation as in Production Example 1 was performed except that the polycarbonate solution was discharged into 500 parts by weight of methanol to obtain a polymer as a white powdery solid. As a result of HPLC analysis of the Soxhlet extract, the resin composition of the obtained polycarbonate copolymer was found to contain 0.08 parts by weight of stearyl alcohol based on 100 parts by weight of the polycarbonate copolymer.

Example 3 Pellets were obtained in the same manner as in Example 1, except that glycerin monostearate was used instead of calcium stearate.

Example 4 Pellets were obtained in the same manner as in Example 1, except that magnesium stearate was used instead of calcium stearate.

Example 5 Pellets were obtained in the same manner as in Example 1 except that stearylamide was used instead of 0.1 part by weight of calcium stearate.

Example 6 Example 1 was repeated except that stearyl laurate was used instead of calcium stearate.
In the same manner as in the above, pellets were obtained.

Example 7 Pellets were obtained in the same manner as in Example 1, except that stearic acid was used instead of calcium stearate.

Example 8 Pellets were obtained in the same manner as in Example 1, except that zinc stearate was used instead of calcium stearate.

Comparative Example 1 The polycarbonate copolymer 10 produced in Comparative Production Example 1
After mixing 0 parts by weight and 0.1 parts by weight of glycerin monostearate with a Henschel mixer, pellets were obtained with a single screw extruder (65 mm).

Comparative Example 2 The polycarbonate copolymer 10 produced in Comparative Production Example 2
After mixing 0 parts by weight and 0.1 parts by weight of glycerin monostearate with a Henschel mixer, pellets were obtained with a single screw extruder (65 mm).

Comparative Example 3 Pellets were obtained in the same manner as in Example 1 except that calcium stearate was not used.

The following evaluation items (1) and (2) were evaluated using the pellets produced in each of the examples and comparative examples, and (3) and (4) were evaluated using the sample (A) below as (B) The evaluation test of (5) was performed using the sample of (5). The evaluation results and the molding temperatures of (A) and (B) are shown in Table 1 below. (A) Molding of a sample for measuring optical properties Injection molding was carried out using a 40-t molding machine to a thickness of 2.0 m.
m, 40 × 80 mm plate (mold temperature 95
° C). (B) Molding of disk-shaped sample Injection molding was performed using a 40t molding machine, and the thickness was 0.6 m.
m, a simple disk-shaped substrate having a diameter of 120 mm was obtained (mold temperature: 95 ° C.).

[Evaluation Methods] (1) Release Resistance A molding test of a cup mold was performed in accordance with JIS K-6911, and the release resistance (maximum value) at the time of release was measured (molding condition: molding temperature: 280 ° C.). , Mold temperature 50 ° C). (2) Melt index (MI) Measured at 280 ° C according to the ASTM D-1283 method. (3) Haze, total light transmittance According to the ASTM D-1003 method, 2 m of the above (A) was used.
The haze and total light transmittance of the plate having a thickness of m were measured. (4) Yellowness index (YI) According to the ASTM D-1925 method, 2 m of the above (A)
The measurement was performed on an m-thick plate. (5) Birefringence Using a precision strain meter (Toshiba Glass Co., Ltd., SVP-30-II), it was measured by the Babinet compensator method. The maximum value in the simple disk type substrate (B) was determined.

[0079]

[Table 1]

[0080]

The resin composition of the present invention containing a polycarbonate copolymer and an aliphatic compound is excellent in melt fluidity, retention stability, mold release property and the like at the time of molding processing. It is excellent in transparency, mechanical properties, heat resistance, etc. and has low birefringence, so that it is useful for optical components such as optical disk substrates, pickup lenses, plastic substrates for liquid crystal cells, prisms, and optical fibers.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) G11B 7/24 526 G11B 7/24 526G (72) Inventor Hiromasa Marubayashi 1190 Kasama-cho, Sakae-ku, Yokohama, Kanagawa Mitsui Within Chemical Co., Ltd. EG026 EG036 EG046 EH036 EH046 EH056 EP016 EP026 GP00 5D029 KA07 KC04 KC07 KC13

Claims (5)

[Claims] 1. The following general formula (1-a) and general formula (2)
-A) a polycarbonate copolymer containing the repeating structural unit represented by the chemical formula (1), and 0.0005 to 5 parts by weight of an aliphatic compound based on 100 parts by weight of the copolymer. A polycarbonate resin composition, characterized in that: Embedded image (Wherein, R ₁ each independently represents an alkyl group, an alkoxy group, a nitro group or a halogen atom, R ₂ and R ₃ each independently represent a hydrogen atom or an alkyl group, R ₄ each independently represent an alkyl group, Represents an alkoxy group or a halogen atom, k independently represents an integer of 0 to 3, and 1 represents each independently an integer of 0 to 2) 2. The polycarbonate copolymer has 5 to 90 mol% of the general formula (1-a) in all the repeating structural units represented by the general formulas (1-a) and (2-a). The polycarbonate resin composition according to claim 1, comprising a repeating structural unit represented by the formula: 3. The polycarbonate resin composition according to claim 1, wherein the weight average molecular weight of the polycarbonate copolymer is 10,000 to 150,000. 4. An optical component obtained by molding the polycarbonate resin composition according to claim 1. 5. In producing an optical component using the polycarbonate resin composition according to claim 1, the resin temperature is 240 to 360 ° C. and the mold temperature is 50 to 15.
A method for producing an optical component, comprising injection molding at 0 ° C.