JP3454080B2 - Aromatic polycarbonate resin composition and optical product member comprising the same - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[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 by using an aromatic diol represented by 2,2-bis (4-hydroxyphenyl) propane is excellent in 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, it has many uses as an optical product member due to its excellent transparency. However, the conventional polycarbonate resin has a drawback that it has a large birefringence as an optical material, and in recent years, the demand for its reduction has been increasing. In particular, when it is used as an optical information material utilizing digital signals, for example, in a digital audio disc, a digital video disc, and a disc for reading and writing information, not only transparency but also optical distortion and birefringence The demand for reduction is strict, and in particular, in the magneto-optical recording system, the birefringence (perpendicular birefringence) in the substrate cross-sectional direction is required to be 5 × 10 ⁻⁵ or less. On the other hand, in order to reduce optical distortion in injection molding that is usually performed, methods such as increasing the molten resin temperature to improve the melt fluidity are adopted. Since various problems occur due to the deterioration of, the solution is not sufficient.

On the other hand, various polycarbonate resin materials have been developed for the purpose of reducing birefringence. For example, 9,9-, which also has heat resistance as a diol component,
A polycarbonate resin using bis (4-hydroxyphenyl) fluorene is known, but this resin has a problem of being difficult to mold although it has a remarkable effect of reducing birefringence. For example, US Pat. No. 5,486,577 In the book, in order to solve this point, 2,2-bis (4-
It has been proposed to mix a polycarbonate resin with hydroxyphenyl) propane. However, as far as the present inventor knows, this composition has low birefringence, but on the other hand, it has problems with transparency and optical homogeneity, and also has poor moldability. Further, JP-A-2-304741 discloses that the fluorene and an aromatic diol such as 2,2-bis (4-hydroxyphenyl) propane or 1,1-bis (4-hydroxyphenyl) -1-phenylethane. Although a polycarbonate copolymer copolymerized with components is described, in this case as well, as far as the present inventors know, although a birefringence reducing effect is recognized, transparency, optical homogeneity is insufficient, Also, 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 in an optical material. It is an object of the present invention to provide an aromatic polycarbonate resin composition having excellent optical properties such as dynamic homogeneity and low birefringence, and also excellent in moldability, and an optical product member comprising the aromatic polycarbonate resin composition.

[0005]

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

[0006]

[Chemical 4] (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)

[0007]

[Chemical 5] (In the formula, 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. A structural unit represented by the following general formula (III)

[0008]

[Chemical 6] (In the formula, X represents an ether bond, a thioether bond, or a sulfone bond, and each benzene ring may have a substituent.), 90 to 4
0 mol% of a copolymer, wherein the peak intensity (Φ) of ¹³ C-NMR derived from a carbonate bond between the structural units represented by the general formula (I) is represented by the general formula (I). And a structural unit represented by the general formula (II) or (I
The ratio (Φ /) to the ¹³ C-NMR peak intensity (Ψ) derived from a carbonate bond with the structural unit represented by II).
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 unit represented by the general formula (I) is When it is contained as a copolymerization component, its content is less than 10 mol%.) 99 to 1% by weight

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The constitutional unit represented by the general formula (I) of the component (A) in the present invention (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. Then, specific examples of the aromatic diol for obtaining the constitutional unit represented by the general formula (I) are:
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- Dichlorofluorene and the like can be mentioned, among which 9,9-bis (4-hydroxyphenyl) fluorene and 9,9-bis (3-methyl-
4-hydroxyphenyl) fluorene is preferred.

Further, as R ¹ and R ² in the constitutional unit represented by the general formula (II), a hydrogen atom, a methyl group,
C1-C1 such as ethyl, propyl, and butyl groups
And the phenyl group may form a cycloalkylene ring with R ¹ and R ² , and the benzene ring has a substituent represented by the above formula (I).
Is the same as in. Then, as a specific example of the aromatic diol for obtaining the constitutional unit represented by the general formula (II), at least one of R ^{1 and} R ^{2 is} a phenyl group which may have a substituent. (Hereinafter, the constituent unit derived from this aromatic diol may be abbreviated as “TP unit”.), And bis (4-hydroxyphenyl) phenylmethane and bis (3-methyl-4-hydroxyphenyl) phenylmethane. , Bis (3-t-butyl-
4-hydroxyphenyl) phenylmethane, bis (2,2
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 and the like, among which 1,1-bis (4-hydroxyphenyl) -1-phenylethane and 1,1-bis (3
-Methyl-4-hydroxyphenyl) -1-phenylethane is preferred.

Further, as a specific example of the aromatic diol for obtaining the constitutional unit represented by the general formula (II), R ¹
And R ² is a hydrogen atom or an alkyl group which may have a substituent (hereinafter, the constituent unit derived from the aromatic diol may be abbreviated as “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 , 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 which 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.

Further, an aromatic diol for obtaining a constitutional unit represented by the general formula (III) (hereinafter, the constitutional unit derived from the aromatic diol may also be abbreviated as "BP unit") Specific examples include 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl sulfide and the like. In addition, as the component (A) in the present invention, as long as the characteristics are not impaired,
Structural units derived from aromatic diols and aliphatic diols other than the above may be copolymerized. In the above, as the aromatic polycarbonate copolymer resin of the component (A) in the present invention, the structural unit (FL unit) derived from the aromatic diol represented by the general formula (I) and the general It is preferable that at least one of R ^{1 and} R ^{2 in} the formula (II) is composed of a structural unit (TP unit) derived from the aromatic diol, which is a phenyl group which may have a substituent.

The constituent unit (FL unit) derived from the aromatic diol represented by the general formula (I) in the aromatic polycarbonate copolymer resin as the component (A), and the general formula (II) and / or The constitutional ratio with the constitutional 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
-60 mol%, the latter 90-40 mol% is essential, the former 10-45 mol%, the latter 90-55.
It is preferably mol%, the former is 10 to 30 mol%,
It is particularly preferable that the latter is 90 to 70 mol%. FL
If the unit is less than 10 mol%, the effect of reducing birefringence as a composition is not recognized, and if it exceeds 60 mol%, the transparency and optical homogeneity as a composition are deteriorated, and further the moldability is further improved. Also causes problems.

[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- derived from a carbonate bond of the structural unit represented by the general formula (I) and the structural unit represented by the general formula (II) or (III) in the peak intensity (Φ) of C-NMR.
It is essential that the ratio (Φ / Ψ) to the peak intensity (Ψ) of NMR (hereinafter, this may be referred to as “FL unit block degree”) is 2 or less, and 0.5 or less. It is preferably 0.25 or less, and particularly preferably 0.25 or less. When the FL unit block degree is larger than 2, the transparency and optical homogeneity of the composition are lowered, and the effect of reducing birefringence is also reduced. The FL unit block degree was determined by ¹³ C-NMR to be 2 with chloroform as a solvent.
It is measured at 5 ° C. The aromatic polycarbonate copolymer resin as the component (A) in the present invention has a methylene chloride solution and an intrinsic viscosity [η] at 20 ° C.
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.

The aromatic polycarbonate resin as the component (B) in the present invention is a structural unit (TP unit and / or TP unit) represented by the general formula (II) and / or (III) used in the component (A). BP unit) is essential, and its constituent unit is preferably 80 mol% or more. As another constituent unit at that time, aroma other than the FL unit in the component (A) is used. Structural units derived from group diols and aliphatic diols are used. When the FL unit is contained as a copolymerization component, its content is less than 10 mol%, but a unit consisting only of the BP unit is preferably used. In addition, the aromatic polycarbonate resin as the component (B) in the present invention is an intrinsic viscosity [η] at 20 ° C. in a methylene chloride solution.
Is preferably in the range of 0.26 to 0.64 dl / g, and the glass transition temperature is approximately 140 to 190 ° C.

The aromatic polycarbonate resin of each of the component (A) and the component (B) in the aromatic polycarbonate resin composition of the present invention is basically a known method used industrially, for example, a known method. Using the catalyst described above, a method by interfacial polymerization from the aromatic diol and phosgene (phosgene method or interfacial polymerization method), or a method by transesterification of the aromatic diol with carbonic acid ester such as diphenyl carbonate (transesterification 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 the specified range, the above formula (II) and / or (III) A method of producing a polycarbonate oligomer having a constitutional unit represented by the following, and then performing interfacial polymerization by adding an alkaline aqueous solution of an aromatic diol for obtaining the constitutional unit represented by the general formula (I) to the oligomer. It is preferable to take.

The aromatic polycarbonate resin composition of the present invention comprises, as a combination of the aromatic polycarbonate copolymer resin as the component (A) and the aromatic polycarbonate resin as the component (B), specifically the following: Can be illustrated. -FL unit / TP unit copolymer + BP unit copolymer-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 copolymer-FL unit / BP unit copolymer + TP unit copolymer-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 + FL unit polymer / FL unit / TP unit / BP unit copolymer + BP unit / TP unit copolymer Polymer / FL unit / TP unit / BP unit copolymer + FL unit / TP unit copolymer as the component (A) in the BP unit / FL unit copolymer,
As the component (B), a combination of BP unit polymers is suitable.

The composition ratio of the component (A) to the component (B) in the aromatic polycarbonate resin composition of the present invention is such that the component (A) is 1 to 99% by weight and the component (B) is 99 to 1% by weight. It is preferable that the component (A) is 5 to 60% by weight and the component (B) is 95 to 40% by weight. Ingredient (A) is 1
If it is less than wt%, the effect of reducing birefringence as a composition will not be recognized, and if it exceeds 99 wt%, there will be a problem in moldability as a composition. Further, 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 150 to 165 ° C. If the glass transition temperature is less than 145 ° C, the mechanical properties and heat resistance inherent in the aromatic polycarbonate resin are lost, and if it exceeds 170 ° C, there is a problem in the moldability of the composition.

In the aromatic polycarbonate resin composition of the present invention, the component (A) and the component (B) are mixed with each other, for example, by mixing respective powders or granules with a mixer such as a super mixer, a Henschel mixer and a tumbler. It can be produced 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 form. Incidentally, the aromatic polycarbonate resin composition of the present invention, in order to impart the required thermal stability, mold release property, antistatic property, etc. when used as a molding material,
For example, phosphite-based and hindered phenol-based antioxidants, benzotriazole-based, benzophenone-based, light stabilizers such as dibenzoylmethane-based and salicylate-based, silicon-based, fatty acid-based, fatty acid ester-based, fatty acid glyceride-based A lubricant such as beeswax and a release agent, an antistatic agent such as polyalkylene glycol and fatty acid glyceride can be added.

To mold an optical product member or the like using the aromatic polycarbonate resin composition of the present invention, extrusion molding,
Although known molding methods such as injection molding, blow molding, compression molding, and injection compression molding can be used, injection compression molding is suitable for molding the optical product member which is one of 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 optical lenses, LCD substrates, PDP substrates, projection TV screens, retardation films, and the like.

[0022]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded. Production Example 1 of Aromatic Polycarbonate Resin Production Example 1 70 parts by weight of 1,1-bis (4-hydroxyphenyl) -1-phenylethane for TP unit, 24 parts by weight of sodium hydroxide, 800 parts by weight of water, and 300 parts of methylene chloride. A mixture with 1 part by weight is charged into a reactor equipped with a stirrer, stirred at 800 rpm, and 30 parts by weight of phosgene is blown into this for 50 minutes for interfacial polymerization, and only a methylene chloride solution containing a polycarbonate oligomer after the reaction is completed. Was collected. The methylene chloride solution of the obtained oligomer was analyzed by the following method, and the following results were obtained. -Oligomer concentration (measured by evaporation to dryness); 23.9% by weight-Terminal chloroformate group concentration (aniline hydrochloride obtained by reacting with aniline was titrated by neutralization with 0.2N sodium hydroxide aqueous solution) 1.20 normal concentration of terminal phenolic hydroxyl group (titanium tetrachloride, color development when dissolved in acetic acid solution at 546 nm for colorimetric determination);
0.050 normal, and 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, and 5
After stirring at 50 rpm, 7.5 parts by weight of 25% by weight sodium hydroxide was added to 9,9-bis (4
-Hydroxyphenyl) fluorene 9,9-bis (4-hydroxyphenyl) obtained by dissolving 6.5 parts by weight
Fluorene sodium salt 14.0 parts by weight, sodium hydroxide 4% by weight aqueous solution 28 parts by weight, and triethylamine 2% by weight aqueous solution 0.57 parts by weight were added, and after performing interfacial polymerization for 7 hours, the reaction product was separated, Methylene chloride solution containing polycarbonate resin, sodium hydroxide aqueous solution,
The resin was collected by washing with an aqueous hydrochloric acid solution and water in this order, and finally by evaporating methylene chloride. The FL block degree Φ / Ψ of this resin is 0.00, and the intrinsic viscosity [η] is 0.31 dl.
/ G, the glass transition temperature was 178 ° C. The above results are shown in Table 1.

Production Examples 2 to 4 An oligomer was produced in the same manner as in Production Example 1 except that the conditions were changed as shown in Table 1, and its solution was analyzed.
Further, a polycarbonate resin was produced and its 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 unit, 1 for TP unit
A mixture of 11.3 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 it for 1 hour to carry out interfacial polymerization. After the reaction was completed, only the methylene chloride solution containing the polycarbonate oligomer was collected, and subsequently 100 parts by weight of this oligomer solution. , 3-pentadecylphenol (1.8 parts by weight), and methylene chloride (140 parts by weight) were charged to a reactor equipped with a stirrer.
Stir at 50 rpm, 48 parts by weight of a 4% by weight aqueous solution of sodium hydroxide, and 2% by weight of triethylamine.
A polycarbonate resin was produced in the same manner as in Production Example 1 except that 0.27 part by weight of an aqueous solution was added and interfacial polymerization was carried out for 7 hours, and then the reaction product was separated, and its physical properties were measured. The above results are shown in Table 2.

Production Examples 6 to 10 An oligomer was produced in the same manner as in Production Example 5 except that the conditions were changed as shown in Table 2, and the solution thereof was analyzed.
Further, a polycarbonate resin was produced and its 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 FL unit, 1 for TP unit
71.3 parts by weight of 1-bis (4-hydroxyphenyl) -1-phenylethane, diphenyl carbonate 75.1
In a 30-liter tank, parts by weight, and an amount corresponding to 1 × 10 ^-6 molar ratio of the rare earth compound to the diol based on the amount of metal as a base, and an amount of cocatalyst corresponding to 10 × 10 ^-6 molar ratio are used. The reactor was charged, the atmosphere was replaced with nitrogen gas, the temperature was gradually raised, the reaction mixture was dissolved, stirring was started, and the temperature was further raised to start the polymerization. The pressure was 100 mmHg and the temperature was 21 mm.
After holding at 0 ℃, gradually reduce the pressure and raise the temperature to 1 mmH
After the temperature was set to 280 ° C. and the temperature was 280 ° C., the produced phenol was distilled off to complete the polymerization in a total polymerization time of 3 to 4 hours. After the pressure in the tank was restored, it was extruded into a water tank in a strand shape and cut into pellets. The FL block degree Φ / Ψ of this resin is 0.20, and the intrinsic viscosity [η] is 0.29 dl /
g, glass transition temperature was 187 ° C. The above results are shown in Table 2.

Examples 1 to 8 and Comparative Examples 1 to 11 Polycarbonate resins obtained in Production Examples 1 to 11 and polycarbonate resins consisting only of constituent units derived from 2,2-bis (4-hydroxyphenyl) propane (Supplied by Mitsubishi Gas Chemical Co., Inc., Iupilon H4000, intrinsic viscosity [η] 0.36 dl / g, glass transition temperature 145 ° C.) at a blending ratio shown in Tables 3 and 4, and then mixed with a super mixer. Resin temperature of 30 using a screw extruder
A resin composition was manufactured by melt-kneading under a temperature condition of 0 to 320 ° C. The glass transition temperature was measured for each resin composition. Further, the obtained resin composition was injection compression molded using an injection compression molding machine (disk 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. The optical disc substrates thus obtained were evaluated for total light transmittance, optical homogeneity, birefringence, and molding transferability by the following methods, and the results are shown in Tables 3 and 4.

Total light transmittance: Measured according to ASTM D1003 using Σ80 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 the ratio to the amplitude value of "Iupilon H4000". The format was a magneto-optical disk having a capacity of 4.6 GB. -Using a birefringence oak manufacturing company ADR-130N, radius 27-6
Diagonal 30 mm with a laser of 632 nm wavelength in the range of 2 mm
The value obtained by measuring the incident angle is shown as the average value of vertical birefringence. -Judging from the depth ratio and shape of the substrate replica and the glass master in the mold transfer pit, the following criteria were used for evaluation. ◎: Very good ○: Good △; Insufficient ×: Very bad

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

[0030]

[Table 1]

[0031]

[Table 2]

[0032]

[Table 3]

[0033]

[Table 4]

[0034]

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

Continuation of front page (56) Reference JP-A-7-268197 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C08G 64/00-64/42 C08L 69/00

Claims (6)

(57) [Claims] 1. A composition comprising the following component (A) and component (B), having a glass transition temperature of 145 to 170 ° C.
An aromatic polycarbonate resin composition, characterized in that Component (A); General formula (I) below: (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) (In the formula, 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. 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.), 90 to 4
0 mol% of a copolymer, wherein the peak intensity (Φ) of ¹³ C-NMR derived from a carbonate bond between the structural units represented by the general formula (I) is represented by the general formula (I). And a structural unit represented by the general formula (II) or (I
The ratio (Φ /) to the ¹³ C-NMR peak intensity (Ψ) derived from a carbonate bond with the structural unit represented by II).
Aromatic polycarbonate copolymer resin having a Ψ) of 2 or less 1 to 99% by weight Component (B); Aromatic polycarbonate comprising a majority of the structural units represented by the general formulas (II) and / or (III) Resin (however, when the constitutional unit represented by the general formula (I) is contained as a copolymerization component, the content thereof is 1
It is less than 0 mol%. ) 99-1% by weight 2. The component (A) is represented by the general formula (I).
Constituent units and R ¹Or R²At least one of
The above general formula which is a phenyl group which may have a substituent
And a component (B),
R¹And R²Has a hydrogen atom or a substituent
A structure represented by the general formula (II), which is an alkyl group
The aromatic polycarbonate according to claim 1, which comprises a unit.
Resin composition. 3. The constituent unit represented by the general formula (I) in the component (A) is 10 to 30 mol%, and the general formula (I)
The structural unit represented by I) and / or (III) is 90 to
It is 70 mol%, The aromatic polycarbonate resin composition of Claim 1 or 2. 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 any one of claims 1 to 4. 6. The optical product member according to claim 5, wherein the optical product member is a substrate for an optical disk.