JPH10324796A - Aromatic polycarbonate resin composition and optical product member comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition excellent in both optical characteristics such as transparency, optical uniformity and low double refraction and moldability and processability, comprising a specific component, by specifying a glass transition temperature. SOLUTION: This composition comprises (A) 1-99 wt.% of an aromatic polycarbonate copolymer which is a copolymer composed of (i) 10-60 mol.% of a constituent unit of formula I and 90-40 wt.% of (ii) a constituent unit of formula II [R<1> and R<2> are each H, a (substituted) alkyl, phenyl, etc.] and/or a constituent unit of formula III (X is an ether bond, a thioether bond, etc.) and has the ratio (Φ/Ψ) of the peak intensity of (Φ)<13> C-NMR derived from a carbonate bond of mutual constituent units of formula I to the peak intensity of (Ψ)<13> C-NMR derived from a carbonate bond of the constituent unit of formula I and a constituent unit of formula II or formula III of <=2 and (B) 99-1 wt.% of an aromatic polycarbonate resin composed of more than half of the constituent unit of formula II and/or formula III and has 145-170 deg.C glass transition temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an aromatic polycarbonate resin composition having excellent optical properties such as transparency, optical homogeneity, and low birefringence, and also having excellent moldability. The present invention relates to an optical product member comprising the same.

[0002]

2. Description of the Related Art Conventionally, aromatic polycarbonate resins, for example, bisphenol A as a diol component,
That is, an aromatic polycarbonate resin obtained using an aromatic diol represented by 2,2-bis (4-hydroxyphenyl) propane has excellent transparency, mechanical properties, heat resistance, dimensional stability, and the like. Therefore, it is widely used in many fields as an engineering plastic, and in particular, has many uses as an optical product member because of its excellent transparency. However, the conventional polycarbonate resin has a drawback of having a large birefringence as an optical material, and in recent years, a demand for reduction thereof has been increasing. In particular, when used as an optical information material utilizing a digital signal, for example, a digital audio disc, a digital video disc, and a disc for information reading and writing, not only transparency, but also optical distortion and birefringence. The requirement for reduction is strict, and among them, in the magneto-optical recording system, it is required that the birefringence (perpendicular birefringence) in the cross-sectional direction of the substrate be 5 × 10 ⁻⁵ or less. On the other hand, in order to reduce optical distortion in injection molding which is usually performed, a method of increasing the molten resin temperature to improve the melt fluidity is adopted, but when the resin temperature is increased, the resin is increased. Various troubles have occurred due to the deterioration of, and it has not been a sufficient solution.

On the other hand, various polycarbonate resin materials have been developed for the purpose of reducing birefringence. For example, as a diol component, 9,9-
A polycarbonate resin using bis (4-hydroxyphenyl) fluorene is known, but this resin has a significant birefringence reduction effect, but has a problem that molding is difficult. For example, U.S. Pat. No. 5,486,577. In order to solve this point, the book states that 2,2-bis (4-
It has been proposed to mix a polycarbonate resin using (hydroxyphenyl) propane. However, as far as the inventor knows, this composition has low birefringence, but has problems in transparency and optical homogeneity, and has insufficient moldability. JP-A-2-304741 discloses the above-mentioned fluorene and aromatic diols such as 2,2-bis (4-hydroxyphenyl) propane and 1,1-bis (4-hydroxyphenyl) -1-phenylethane. Although a polycarbonate copolymer obtained by copolymerizing the component with the component is described, also in this case, as far as the present inventor knows, although the effect of reducing birefringence is recognized, transparency, optical homogeneity is insufficient, In addition, there is a problem in moldability.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems in using an aromatic polycarbonate resin for an optical material. It is an object of the present invention to provide an aromatic polycarbonate resin composition having excellent optical properties such as mechanical homogeneity and low birefringence, and also excellent in moldability, and an optical product member comprising the same.

[0005]

The present invention provides an aromatic polycarbonate resin composition having the following components (A) and (B), and having a glass transition temperature of 145 to 170 ° C. And an optical product member comprising the same. Component (A); the following general formula (I)

[0006]

Embedded image (Wherein each benzene ring may have a substituent), and 10 to 60 mol% of a structural unit represented by the following general formula (II)

[0007]

Embedded image (Wherein, R ¹ and R ² represent a hydrogen atom, an alkyl group which may have a substituent, or a phenyl group which may have a substituent, and each benzene ring has a substituent. And / or a structural unit represented by the following general formula (III):

[0008]

Embedded image (In the formula, X represents an ether bond, a thioether bond, or a sulfone bond, and each benzene ring may have a substituent.)
0 mol%, and a peak intensity (Φ) of ¹³ C-NMR derived from a carbonate bond between the structural units represented by the general formula (I), which is represented by the general formula (I) And a structural unit represented by the general formula (II) or (I
II) The ratio (Φ / φ) to the ¹³ C-NMR peak intensity (Ψ) derived from the carbonate bond with the structural unit represented by
1) to 99% by weight of an aromatic polycarbonate copolymer resin having Ψ) of 2 or less

Component (B): an aromatic polycarbonate resin comprising a majority of the structural units represented by the general formulas (II) and / or (III) (provided that the structural units represented by the general formula (I)) Is contained as a copolymer component, the content is less than 10 mol%.) 99 to 1% by weight

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The structural unit of the component (A) in the present invention represented by the general formula (I) (hereinafter referred to as "FL unit")
May be abbreviated. Examples of the substituent of the benzene ring in ()) include an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a phenyl group, a nitro group, and a halogen atom. Specific examples of the aromatic diol for obtaining the structural unit represented by the general formula (I) include:
9,9-bis (4-hydroxyphenyl) fluorene,
9,9-bis (3-methyl-4-hydroxyphenyl)
Fluorene, 9,9-bis (3,5-dimethyl-4-hydroxyphenyl) fluorene, 9,9-bis (3-ethyl-4-hydroxyphenyl) fluorene, 9,9-
Bis (3-methoxy-4-hydroxyphenyl) fluorene, 9,9-bis (3-phenyl-4-hydroxyphenyl) fluorene, 9,9-bis (3-chloro-4-
(Hydroxyphenyl) fluorene, 9,9-bis (3-
Trichloromethyl-4-hydroxyphenyl) fluorene, 9,9-bis (4-hydroxyphenyl) -3,6
-Dimethylfluorene, 9,9-bis (4-hydroxyphenyl) -4,5-dimethylfluorene, 9,9-bis (4-hydroxyphenyl) -3,6-dichlorofluorene, 9,9-bis (4- Hydroxyphenyl)-
3,6-diphenylfluorene, 9,9-bis (3-methyl-4-hydroxyphenyl) -3,6-dimethylfluorene, 9,9-bis (3-methyl-4-hydroxyphenyl) -3,6- Examples thereof include dichlorofluorene. Among them, 9,9-bis (4-hydroxyphenyl) fluorene and 9,9-bis (3-methyl-
4-Hydroxyphenyl) fluorene is preferred.

Further, R ¹ and R ² in the structural unit represented by the general formula (II) are a hydrogen atom, a methyl group,
C 1 to C 1 such as an ethyl group, a propyl group, and a butyl group
And a phenyl group and the like. Further, R ¹ and R ² may form a cycloalkylene ring, and the substituent of the benzene ring may be the same as the general formula (I)
The same as in. Specific examples of the aromatic diol for obtaining the structural unit represented by the general formula (II) include those in which at least one of R ^{1 and} R ^{2 is} a phenyl group which may have a substituent. (Hereinafter, the structural unit derived from the aromatic diol may be abbreviated as “TP unit”.) Bis (4-hydroxyphenyl) phenylmethane, bis (3-methyl-4-hydroxyphenyl) phenylmethane , Bis (3-t-butyl-
4-hydroxyphenyl) phenylmethane, bis (2
6-dimethyl-4-hydroxyphenyl) phenylmethane, bis (3,5-dimethyl-4-hydroxyphenyl) phenylmethane, bis (2,3,5-trimethyl-
4-hydroxyphenyl) phenylmethane, bis (3-
Phenyl-4-hydroxyphenyl) phenylmethane,
Bis (3-fluoro-4-hydroxyphenyl) phenylmethane, bis (3-bromo-4-hydroxyphenyl) phenylmethane, bis (3-fluoro-4-hydroxyphenyl) -4-fluorophenylmethane, bis (4- (Hydroxyphenyl) -4-fluorophenylmethane, bis (4-hydroxyphenyl) -4-chlorophenylmethane, bis (4-hydroxyphenyl) -4-
Bromophenylmethane, bis (3,5-dimethyl-4-
(Hydroxyphenyl) -4-fluorophenylmethane,
1,1-bis (4-hydroxyphenyl) -1-phenylethane, 1,1-bis (3-methyl-4-hydroxyphenyl) -1-phenylethane, 1,1-bis (3-
t-butyl-4-hydroxyphenyl) -1-phenylethane, 1,1-bis (3-phenyl-4-hydroxyphenyl) -1-phenylethane, 1,1-bis (4-
(Hydroxyphenyl) -1- (4-nitrophenyl) ethane, 1,1-bis (3-bromo-4-hydroxyphenyl) -1-phenylethane, 1,1-bis (4-hydroxyphenyl) -1-phenyl Propane, bis (4-
Hydroxyphenyl) diphenylmethane, among which 1,1-bis (4-hydroxyphenyl) -1-phenylethane and 1,1-bis (3
-Methyl-4-hydroxyphenyl) -1-phenylethane is preferred.

Further, as specific examples of the aromatic diol for obtaining the structural unit represented by the general formula (II), R ¹
And those in which R ² is a hydrogen atom or an alkyl group which may have a substituent (hereinafter, a structural unit derived from the aromatic diol may be abbreviated as a “BP unit”). (4-hydroxyphenyl) methane, bis (3-methyl-4-hydroxyphenyl) methane, 1,1-bis (3-methyl-4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl)
Propane, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (3-methyl-4-hydroxyphenyl) propane, 2,2-bis (3-ethyl-4-hydroxyphenyl) propane, , 2-bis (3-isopropyl-4-hydroxyphenyl) propane, 2,2
-Bis (3-s-butyl-4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyphenyl) hexafluoropropane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis ( 4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) pentane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 2,2-bis (4-
Hydroxyphenyl) hexane, 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4
-Hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl) dibenzylmethane and the like. Among them, bis (4-hydroxyphenyl) methane,
2,2-bis (4-hydroxyphenyl) propane,
2,2-bis (3-methyl-4-hydroxyphenyl)
Propane and 2,2-bis (4-hydroxyphenyl) hexafluoropropane are preferred, and 2,2-bis (4-hydroxyphenyl) propane is particularly preferred.

The aromatic diol for obtaining the structural unit represented by the general formula (III) (hereinafter, the structural unit derived from the aromatic diol may be abbreviated as “BP unit”). Specific examples include 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenylsulfone, and 4,4'-dihydroxydiphenylsulfide. In addition, as the component (A) in the present invention, as long as its properties are not impaired,
Structural units derived from aromatic diols and aliphatic diols other than those described above may be copolymerized. Among the above, as the aromatic polycarbonate copolymer resin of the component (A) in the present invention, a structural unit (FL unit) derived from the aromatic diol represented by the general formula (I), It is preferable that at least one of R ^{1 and} R ^{2 in} the formula (II) is a phenyl group which may have a substituent and a structural unit (TP unit) derived from the aromatic diol.

In the aromatic polycarbonate copolymer resin of the component (A), a structural unit (FL unit) derived from the aromatic diol represented by the general formula (I) and the general formula (II) and / or The structural ratio with the structural unit (TP unit and / or BP unit) derived from the aromatic diol represented by (III) is based on the total amount of the FL unit and the TP unit and / or BP unit. The former is 10
６０60 mol%, the latter must be 90〜40 mol%, the former is 10４５45 mol%, and the latter is 90〜55 mol%.
Mol%, preferably the former is 10 to 30 mol%,
It is particularly preferred that the latter is from 90 to 70 mol%. FL
If the unit is less than 10 mol%, the effect of reducing the birefringence of the composition will not be recognized, and if it exceeds 60 mol%, the transparency and optical homogeneity of the composition will be reduced, and furthermore, the moldability will be reduced. Problems also arise.

[0015] Aromatic polycarbonate copolymer resin as component (A) in the present invention is derived from the carbonate bond of the structural unit each other represented by the general formula (I) ^13
13 C-NMR peak intensity (Φ) derived from the carbonate bond between the structural unit represented by the general formula (I) and the structural unit represented by the general formula (II) or (III)
It is essential that the ratio (Φ / Ψ) to the peak intensity (Ψ) of NMR (hereinafter sometimes referred to as “FL unit block degree”) is 2 or less, and 0.5 or less. It is particularly preferably 0.25 or less. When the FL unit block degree is larger than 2, the transparency and optical homogeneity of the composition decrease, and the effect of reducing birefringence also decreases. The FL unit block degree was determined by ¹³ C-NMR using chloroform as a solvent.
It was measured at 5 ° C. The aromatic polycarbonate copolymer resin as the component (A) in the present invention has a limiting viscosity [η] at 20 ° C. of a methylene chloride solution.
It is preferably in the range of 0.20 to 0.46 dl / g, and the glass transition temperature is about 155 to 220 ° C.

As the aromatic polycarbonate resin of the component (B) in the present invention, the structural unit represented by the general formula (II) and / or (III) used in the component (A) (TP unit and / or (BP unit) is essential, and the constitutional unit is preferably at least 80 mol%, and the other constitutional unit at that time may be an aromatic compound other than the FL unit in the component (A). Structural units derived from aliphatic diols and aliphatic diols are used. When the FL unit is contained as a copolymer component, the content is less than 10 mol%, but a unit composed of only the BP unit is suitably used. Further, the aromatic polycarbonate resin as the component (B) in the present invention is a methylene chloride solution, an intrinsic viscosity at 20 ° C. [η].
Is preferably in the range of 0.26 to 0.64 dl / g, and the glass transition temperature is about 140 to 190 ° C.

The aromatic polycarbonate resin of each of the components (A) and (B) in the aromatic polycarbonate resin composition of the present invention is basically prepared by a known method used in industry, for example, a known method. By the interfacial polymerization (phosgene method or interfacial polymerization method) from the aromatic diol and phosgene using the above catalyst, or a method by transesterification of the aromatic diol with a carbonate ester such as diphenyl carbonate (ester exchange method). , Or a melt polymerization method). However, in the production of the aromatic polycarbonate copolymer resin of the component (A), in order to keep the FL unit block degree within a prescribed range, the resin is represented by the general formula (II) and / or (III). A method of producing a polycarbonate oligomer comprising the structural unit represented by the formula, and then adding an alkaline aqueous solution of an aromatic diol to the oligomer to obtain the structural unit represented by the general formula (I), followed by interfacial polymerization. It is preferred to take.

The aromatic polycarbonate resin composition of the present invention is specifically composed of the following combination of an aromatic polycarbonate copolymer resin as the component (A) and an aromatic polycarbonate resin as the component (B). Can be exemplified.・ FL unit / TP unit copolymer + BP unit polymer ・ FL unit / TP unit copolymer + BP unit / TP unit copolymer ・ FL unit / TP unit copolymer + BP unit / FL unit copolymer・ FL unit / BP unit copolymer + BP unit polymer ・ FL unit / BP unit copolymer + TP unit polymer ・ FL unit / BP unit copolymer + BP unit / TP unit copolymer ・ FL unit / BP unit copolymer + BP unit / FL unit copolymer ・ FL unit / TP unit / BP unit copolymer + BP unit polymer ・ FL unit / TP unit / BP unit copolymer + BP unit / TP unit copolymer Polymer-FL unit / TP unit / BP unit copolymer + BP unit / FL unit copolymer In component (A), FL unit / TP unit copolymer,
As the component (B), a combination of a BP unit polymer is preferable.

The composition ratio of component (A) to component (B) in the aromatic polycarbonate resin composition of the present invention is such that component (A) is 1 to 99% by weight and component (B) is 99 to 1% by weight. Preferably, component (A) is 5 to 60% by weight and component (B) is 95 to 40% by weight. Component (A) is 1
When the amount is less than 100% by weight, the effect of reducing the birefringence of the composition is not recognized. In addition, the aromatic polycarbonate resin composition of the present invention must have a glass transition temperature of 145 to 170 ° C as a composition,
It is preferably from 150 to 165 ° C. If the glass transition temperature is lower than 145 ° C, the mechanical properties and heat resistance inherent in the aromatic polycarbonate resin are lost. If the glass transition temperature is higher than 170 ° C, there is a problem in the moldability of the composition.

The aromatic polycarbonate resin composition of the present invention is obtained by mixing the component (A) and the component (B), for example, by mixing the respective powders or granules with a mixer such as a super mixer, a Henschel mixer or a tumbler. It can be manufactured by a known method such as a method of melt-kneading with a twin-screw extruder, a kneader, a roll, or the like, or a method of mixing in a solution state. Incidentally, the aromatic polycarbonate resin composition of the present invention, in order to impart the required thermal stability, release properties, antistatic properties and the like when used as a molding material,
For example, antioxidants such as phosphites and hindered phenols, light stabilizers such as benzotriazoles, benzophenones, dibenzoylmethane, and salicylates, silicones, fatty acids, fatty acid esters, and fatty acid glycerides And beeswax-based lubricants and release agents, and polyalkylene glycol-based and fatty acid glyceride-based antistatic agents and the like can be added.

To mold optical product members and the like using the aromatic polycarbonate resin composition of the present invention, extrusion molding,
Known molding methods such as injection molding, blow molding, compression molding, and injection compression molding can be used, but injection compression molding is suitable for molding the optical product member according to the present invention. Specific examples of the optical product member molded using the aromatic polycarbonate resin composition of the present invention include a high-density optical disk substrate, an optical disk pickup lens,
Examples include an optical lens, an LCD substrate, a PDP substrate, a television screen for projection, and a retardation film.

[0022]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the scope of the present invention. Production of Aromatic Polycarbonate Resin Production Example 1 70 parts by weight of 1,1-bis (4-hydroxyphenyl) -1-phenylethane for TP units, 24 parts by weight of sodium hydroxide, 800 parts by weight of water, and 300 parts of methylene chloride Parts by weight was charged into a reactor equipped with a stirrer, stirred at 800 rpm, and 30 parts by weight of phosgene was blown into the mixture for 50 minutes to perform interfacial polymerization. After the reaction, only a methylene chloride solution containing a polycarbonate oligomer was added. Was collected. The obtained methylene chloride solution of the oligomer was analyzed by the following method, and the following results were obtained. -Oligomer concentration (measured by evaporating to dryness); 23.9% by weight-Terminal chloroformate group concentration (Neutralization titration of aniline hydrochloride obtained by reacting with aniline with 0.2N aqueous sodium hydroxide) 1.20 rules ・ Terminal phenolic hydroxyl group concentration (colorimetric determination at 546 nm when dissolved in titanium tetrachloride, acetic acid solution);
0.050 N Subsequently, 183 parts by weight of this oligomer solution, pt
-A mixture of 2.0 parts by weight of butylphenol and 150 parts by weight of methylene chloride was charged into a reactor equipped with a stirrer,
The mixture was stirred at 50 rpm, and further mixed with 9,9-bis (4
9,9-bis (4-hydroxyphenyl) obtained by dissolving 6.5 parts by weight of (-hydroxyphenyl) fluorene
14.0 parts by weight of fluorene sodium salt, 28 parts by weight of a 4% by weight aqueous solution of sodium hydroxide, and 0.57 parts by weight of a 2% by weight aqueous solution of triethylamine were added, and after interfacial polymerization was carried out for 7 hours, the reaction product was separated. Methylene chloride solution containing polycarbonate resin, sodium hydroxide aqueous solution,
The resin was washed with an aqueous hydrochloric acid solution and water in that order, and finally, methylene chloride was evaporated to collect the resin. The FL block degree Φ / Ψ of this resin is 0.00, and the intrinsic viscosity [η] is 0.31 dl.
/ G, glass transition temperature was 178 ° C. Table 1 shows the above results.

Production Examples 2 to 4 An oligomer was produced and the solution was analyzed in the same manner as in Production Example 1 except that the conditions were changed as shown in Table 1.
Furthermore, a polycarbonate resin was manufactured, and its various physical properties were measured. They are shown in Table 1.

Production Example 5 28.7 parts by weight of 9,9-bis (4-hydroxyphenyl) fluorene for FL units and 1,8.7 parts for TP units
A mixture of 71.3 parts by weight of 1-bis (4-hydroxyphenyl) -1-phenylethane, 41 parts by weight of sodium hydroxide, 620 parts by weight of water, and 290 parts by weight of methylene chloride was charged into a reactor equipped with a stirrer, The mixture was stirred at 800 rpm, and 63 parts by weight of phosgene was blown into the mixture for 1 hour to carry out interfacial polymerization. After the completion of the reaction, only the methylene chloride solution containing the polycarbonate oligomer was collected. , 3-pentadecylphenol 1.8 parts by weight and methylene chloride 140 parts by weight were charged into a reactor equipped with a stirrer,
Stir at 50 rpm, further add 48 parts by weight of a 4% by weight aqueous solution of sodium hydroxide, and 2% by weight of triethylamine.
After adding 0.27 parts by weight of an aqueous solution and conducting interfacial polymerization for 7 hours, a polycarbonate resin was produced in the same manner as in Production Example 1 except that the reaction product was separated, and its physical properties were measured. Table 2 shows the above results.

Production Examples 6 to 10 An oligomer was produced and the solution was analyzed in the same manner as in Production Example 5 except that the conditions were changed as shown in Table 2.
Furthermore, a polycarbonate resin was manufactured, and its various physical properties were measured. They are shown in Table 2.

Production Example 11 28.7 parts by weight of 9,9-bis (4-hydroxyphenyl) fluorene for the FL unit, and 18.7 parts for the TP unit
71.3 parts by weight of 1-bis (4-hydroxyphenyl) -1-phenylethane, 75.1 parts of diphenyl carbonate
Bath of parts, and the amount of the rare earth compound corresponding to 1 × 10 ^-6 mole ratio relative to the diol as a base over scan the metal content, the amount of 30 liters of further corresponding cocatalyst to 10 × 10 ^-6 mole ratio After the reactor was charged and purged with nitrogen gas, the temperature was gradually raised to dissolve the reaction mixture, stirring was started, and then the temperature was further raised to start polymerization, pressure 100 mmHg, temperature 21
After maintaining the temperature at 0 ° C., the pressure was gradually reduced and the temperature was increased to 1 mmH
g, and the temperature was set to 280 ° C., and the resulting phenol was distilled off to terminate the polymerization in a total polymerization time of 3 to 4 hours. After restoring the pressure in the tank, it was extruded into a water tank in a strand shape and cut into pellets. FL block degree Φ / 度 of this resin is 0.20, intrinsic viscosity [η] is 0.29 dl /
g, glass transition temperature was 187 ° C. Table 2 shows the above results.

Examples 1 to 8, Comparative Examples 1 to 11 Polycarbonate resins obtained in Production Examples 1 to 11 and polycarbonate resins comprising only structural units derived from 2,2-bis (4-hydroxyphenyl) propane (Mitsubishi Gas Chemical Co., Ltd., Iupilon H4000, intrinsic viscosity [η] 0.36 dl / g, glass transition temperature 145 ° C.), and after mixing with a supermixer in the mixing ratios shown in Tables 3 and 4, Resin temperature 30 using a screw extruder
The resin composition was produced by melt-kneading at a temperature of 0 to 320 ° C. The glass transition temperature of each resin composition was measured. Further, the obtained resin composition was subjected to injection compression molding using an injection compression molding machine (Disc 5AM3) manufactured by Sumitomo Heavy Industries, Ltd. to form an optical disk substrate having a diameter of 130 mm and a thickness of 1.2 mm. For each of the obtained optical disc substrates, the total light transmittance, optical homogeneity, birefringence, and mold transferability were evaluated by the following methods, and the results are shown in Tables 3 and 4.

The total light transmittance was measured according to ASTM D1003 using # 80 manufactured by Nippon Denshoku Co., Ltd. -Optical homogeneity Tester manufactured by PULSTEC (optical system: laser wavelength 6)
(80 nm, NA = 0.6), the focus error signal (FES) was measured in the tracking ON state, and the ratio was shown as a ratio to the amplitude value of the “Iupilon H4000”. The format was a 4.6 GB magneto-optical disk. -Birefringence Use ADR-130N manufactured by Oak Works, radius 27-6
The range of 2 mm is obliquely 30
The average value of the perpendicular birefringence measured at the incident angle is shown. -Mold transferability Judgment was made based on the depth ratio and shape between the substrate replica and the glass master in the pit, and evaluated based on the following criteria. ◎; very good ○; good △; insufficient ×; very bad

Comparative Example 12 As the component (A), 28% by weight of the resin obtained in Production Example 8
And a mixture of 72% by weight of the resin obtained in Production Example 9 (intrinsic viscosity [η] 0.30 dl / g, glass transition temperature 1
87 ° C.), except that a resin composition was produced in the same manner as in Examples 1 to 8 and the like. The results are shown in Table 4.

[0030]

[Table 1]

[0031]

[Table 2]

[0032]

[Table 3]

[0033]

[Table 4]

[0034]

The present invention provides an aromatic polycarbonate resin composition having excellent optical properties such as transparency, optical homogeneity, and low birefringence, and also having excellent moldability. An optical product member can be provided.

Claims (6)

[Claims] 1. A composition comprising the following components (A) and (B), having a glass transition temperature of 145 to 170 ° C.
An aromatic polycarbonate resin composition characterized by the following. Component (A); the following general formula (I): (In the formula, each benzene ring may have a substituent.) 10 to 60 mol% of a structural unit represented by the following general formula (II): (Wherein, R ¹ and R ² represent a hydrogen atom, an alkyl group which may have a substituent, or a phenyl group which may have a substituent, and each benzene ring has a substituent. And / or a structural unit represented by the following general formula (III): (In the formula, X represents an ether bond, a thioether bond, or a sulfone bond, and each benzene ring may have a substituent.)
0 mol%, and a peak intensity (Φ) of ¹³ C-NMR derived from a carbonate bond between the structural units represented by the general formula (I), which is represented by the general formula (I) And a structural unit represented by the general formula (II) or (I
II) The ratio (Φ / φ) to the ¹³ C-NMR peak intensity (Ψ) derived from the carbonate bond with the structural unit represented by
1) to 99% by weight of an aromatic polycarbonate copolymer resin having Ψ) of 2 or less. Component (B); Aromatic polycarbonate comprising a majority of the structural units represented by formulas (II) and / or (III). Resin (however, when the structural unit represented by the general formula (I) is contained as a copolymer component, the content is 1
Less than 0 mol%. ) 99-1% by weight 2. Component (A) represented by the above general formula (I)
A structural unit represented by R ¹Or R^TwoAt least one of
The general formula which is a phenyl group which may have a substituent
It comprises a structural unit represented by (II), wherein component (B) is
R¹And R^TwoHas a hydrogen atom or a substituent,
A structure represented by the general formula (II), which is an alkyl group;
2. The aromatic polycarbonate according to claim 1, comprising an aromatic unit.
Resin composition. 3. The composition according to claim 1, wherein the component (A) comprises 10 to 30 mol% of the structural unit represented by the general formula (I).
When the structural unit represented by (I) and / or (III) is 90 to
The aromatic polycarbonate resin composition according to claim 1, wherein the amount is 70 mol%. 4. The aromatic polycarbonate resin composition according to claim 1, wherein the component (A) is 5 to 60% by weight and the component (B) is 95 to 40% by weight. 5. An optical product member comprising the aromatic polycarbonate resin composition according to claim 1. Description: 6. The optical product member according to claim 5, wherein the optical product member is a substrate for an optical disk.