JP2000302857A - Molding material for optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a molding material of polycarbonate having good moldability as well as a low birefringence by reacting 1,1'-bi-naphthol, 4,4'-[1,3- phenylenebis(1-methylethylidene)]bisphenol and a dihydric phenol with phosgene. SOLUTION: A polycarbonate resin has a unit represented by formula I, a unit represented by formula II and a unit derived from a divalent phenol represented by formula III wherein the amount of the structure unit represented by formula I is 5 to 40 mol% of all structure units and that represented by formula II is 10 to 90 mol% of all structure units, and the polycarbonate resin has an intrinsic viscosity of 0.30 to 0.50 dl/g (wherein (w) is represented by formula IV or the like; R1 to R4 are each H, halogen, a 1-10C alkyl group, a 6-12C aryl group, a 2-5C alkenyl group, a 1-5C alkoxy group or a 7-17C aralkyl group; Y is represented by formula V or the like; R5 and R6 are each H, a 1-10C alkyl group, a 2-10C alkenyl group, a 1-10C alkoxy group or a 6-12C aryl group; and (a) is 0 to 20). An additive for keeping stability and releasability is, if necessary, added to the molding material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to molding a polycarbonate resin optical recording medium having reduced moldability and reduced birefringence suitable for manufacturing optical recording media such as compact disks, laser disks, optical cards, MO disks, and the like. About the material.

[0002]

2. Description of the Related Art Bisphenol A type polycarbonate has recently been widely used as a base material for optical discs, taking advantage of its characteristics such as transparency, heat resistance, hydrolysis resistance and dimensional stability. However, there are some problems when using polycarbonate for optical disks.

Of the performance as an optical disk substrate, birefringence, which substantially weakens a laser beam used for reading and writing information, is the most important problem. For a material having a large birefringence, errors increase, and as a recording medium, Is inferior in reliability.

[0004] Various polycarbonate resin materials have been developed for the purpose of reducing the birefringence. (JP 6
However, in recent years, in the field of optical discs where the recording density has been increasing, the measures against birefringence cannot be said to be sufficient with these materials.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a molding material for an optical recording medium having both excellent moldability and low birefringence.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the conventional problems, the present inventors have found that a terpolymer polycarbonate resin derived from three specific types of bisphenols has a low degree of polymerization. The inventors have found that a high-quality optical recording medium molding material having both refractivity and good moldability can be obtained, and have completed the present invention.

[0007]

DETAILED DESCRIPTION OF THE INVENTION That is, the present invention has structural units represented by the general formulas (A), (B) and (C), and the structural units of the general formula (A) 5 in structural unit
It is a molding material for an optical recording medium comprising polycarbonate having an intrinsic viscosity of 0.30 to 0.50 dl / g.

[0008]

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[0009]

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[0010]

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(Where W is

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Wherein R _{1 to} R ₄ are each independently hydrogen,
Fluorine, chlorine, bromine, iodine, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or 7 to 17 carbon atoms Is an aralkyl group. However, when these groups have carbon, they are selected from alkyl groups having 1 to 5 carbon atoms, alkenyl groups having 2 to 5 carbon atoms, alkoxy groups having 1 to 5 carbon atoms, fluorine, chlorine, bromine and iodine. Also included are those substituted with a halogen, a dimethylpolysiloxy group, and an alkylarylpolysiloxy group. Y is

[0013]

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Wherein R ₅ and R ₆ are each independently hydrogen, an alkyl group having 1 to 10 carbon atoms, and 2 to 1 carbon atoms.
Represents an alkenyl group having 0, an alkoxy group having 1 to 10 carbon atoms, or an aryl group having 6 to 12 carbon atoms, or a group in which R ₅ and R ₆ are bonded together to form a carbocyclic or heterocyclic ring. However, when these groups contain carbon, they are substituted with an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, fluorine, chlorine, bromine, and iodine. Including those that have been done. a represents an integer of 0 to 20, and b represents an integer of 1 to 100. )

The polycarbonate of the present invention can be produced by a known method used for producing polycarbonate from bisphenol A, for example, a direct reaction of dihydric phenol with phosgene (phosgene method), or a reaction between dihydric phenol and bisaryl carbonate. , Etc. can be employed.

In the former phosgene method, 1,1'-bi-2-naphthol, which induces the general formula (A) of the present invention, and general formula (B), which are derived from the general formula (A), are usually prepared in the presence of an acid binder and a solvent. 4,4 '-[1,3-phenylenebis (1-methylethylidene)] bisphenol, and a dihydric phenol which leads to the general formula (C) are reacted with phosgene. As the acid binder, for example, pyridine, hydroxides of alkali metals such as sodium hydroxide and potassium hydroxide, and the like are used. As the solvent, for example, methylene chloride, chloroform, chlorobenzene, xylene and the like are used. Further, a tertiary amine catalyst such as triethylamine and a catalyst such as a quaternary ammonium salt are used to promote the polycondensation reaction, and phenol, pt-butylphenol and p-cumylphenol are used for controlling the degree of polymerization. A monofunctional compound such as a phenol represented by the general formula (D) is added as a molecular weight regulator.

[0017]

Embedded image (Wherein, R ₇ represents an alkyl group having 4 to 20 carbon atoms;
_{8 to} R ₉ each independently represent hydrogen, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms. Z represents an ester group, an ether group, a carbonyl group, or simply represents a bond. )

Further, if desired, an antioxidant such as sodium sulfite or hydrosulfite, phloroglucin, isatin bisphenol, 1,1,1-tris (4-hydroxyphenyl) ethane, α, α ′, α ″- A small amount of a branching agent such as tris (4-hydroxyphenyl) -1,3,5-triisopropylbenzene may be added.
C, preferably in the range of 5 to 40C. The reaction time depends on the reaction temperature, but is usually 0.5 minutes to 10 hours, preferably 1 minute to 2 hours.
During the reaction, it is desirable to maintain the pH of the reaction system at 10 or more.

On the other hand, in the latter transesterification method,
A mixture of 1,1'-bi-2-naphthol, 4,4 '-[1,3-phenylenebis (1-methylethylidene)] bisphenol, a dihydric phenol for deriving the general formula (C) and a bisaryl carbonate And react at elevated temperature under reduced pressure.
At this time, monofunctional compounds such as pt-butylphenol, p-cumylphenol and phenols represented by the general formula (D) may be added as a molecular weight regulator. The reaction is usually performed at a temperature in the range of 150 to 350 ° C., preferably 200 to 300 ° C., and the degree of reduced pressure is finally 1 mmHg.
Preferably, the phenols derived from the bisaryl carbonate generated by the transesterification reaction are distilled out of the system. The reaction time depends on the reaction temperature and the degree of pressure reduction, but is usually about 1 to 6 hours. The reaction is preferably performed in an atmosphere of an inert gas such as nitrogen or argon. Further, if desired, the reaction may be performed by adding an antioxidant or a branching agent.

In the phosgene method and the transesterification method, the phosgene method is preferred in consideration of the reactivity of the compound for deriving the structure of the general formula (A) and the compound for deriving the structure of the general formula (B).

The dihydric phenol derived from the general formula (C) used for the production of the polycarbonate in the present invention is specifically 4,4'-biphenyldiol, bis (4-hydroxyphenyl) methane, bis (4-hydroxyphenyl) methane, (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfoxide, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) ketone, 1,1-bis ( 4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A; BPA), 2,2-bis (4-hydroxyphenyl) butane, 1,1-bis (4-hydroxy Phenyl) cyclohexane (bisphenol Z; BPZ), 2,2-
Bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dichlorophenyl)
Propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3-chlorophenyl) propane, 2,2-bis (4-hydroxy-3-methylphenyl) Propane (dimethyl bisphenol A; DMBPA
), 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 1,1-bis (4-hydroxyphenyl) -1-
Phenylethane (bisphenol AP; BPAP), bis (4-hydroxyphenyl) diphenylmethane, 2,2-bis (4-hydroxyphenyl) hexafluoropropane, 2,
2-bis (4-hydroxy-3-allylphenyl) propane,
α, ω-bis [2- (p-hydroxyphenyl) ethyl] polydimethylsiloxane, α, ω-bis [3- (o-hydroxyphenyl) propyl] polydimethylsiloxane, 9,9-
Bis (3-methyl-4-hydroxyphenyl) fluorene,
2,2-bis (4-hydroxy-3-allylphenyl) propane, 3,3,5-trimethyl-1,1-bis (4-hydroxyphenyl) cyclohexane, 6,6′-dihydroxy-3,3,3 ', 3'-
Tetramethyl-1,1'-spirobiindane, 1,1,3-trimethyl-3- (4-hydroxyphenyl) -indan-5-ol, 6,6'-dihydroxy-4,4,4 ', 4'7 , 7'-Hexamethyl
-2,2'-spirobichroman and the like. They are,
Two or more types can be used in combination.

Among these, in particular, 1,1-bis (4-
(Hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl) diphenylmethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 9,9-bis (3-methyl-4-hydroxyphenyl) fluorene, 3,5-trimethyl-1,1-bis (4-hydroxyphenyl) cyclohexane, 6,6′-dihydroxy-3,3,3 ′, 3′-tetramethyl-1,
It is preferably selected from 1'-spirobiindane. These may be used in combination of two or more.

Further, as the molecular weight regulator of the present invention, a monohydric phenol represented by the general formula (D), which is expected to be effective in improving fluidity, is preferred. Specifically, n-butylphenol, octylphenol, nonylphenol, Long-chain alkyl-substituted phenols such as decanyl phenol, tetradecanyl phenol, heptadecanyl phenol, and octadecanyl phenol; butyl hydroxybenzoate;
Hydroxybenzoic acid long-chain alkyl esters such as octyl hydroxybenzoate, nonyl hydroxybenzoate, decanyl hydroxybenzoate, and heptadecanyl hydroxybenzoate; butoxyphenol, octyloxyphenol, nonyloxyphenol, decanyloxyphenol, tetradecanyloxyphenol And long-chain alkyloxyphenols such as heptadecanyloxyphenol and octadecanyloxyphenol.

When the phosgene method is employed in the present invention, it is preferable to add a small amount of a quaternary ammonium salt in order to carry out the reaction efficiently after the completion of the phosgene blowing.
Specific examples include tetramethylammonium chloride, trimethylbenzylammonium chloride, triethylbenzylammonium chloride, tetraethylammonium bromide, and tetra-n-butylammonium iodide. Of these, trimethylbenzylammonium chloride and triethylbenzylammonium chloride are preferred. This quaternary ammonium salt, based on all bisphenols used,
Generally, 0.0005 to 5 mol% is preferably used. Three to ten minutes after the addition of the quaternary ammonium salt, a tertiary amine such as triethylamine and a molecular weight regulator are preferably added for polymerization. The addition amount of the tertiary amine is
It is 0.01 to 1.0 mol% based on all bisphenols.
The amount of the molecular weight modifier to be added is 3 to 10 mol% based on all bisphenols.

The polycarbonate polymer synthesized by these reactions can be molded by a known molding method such as extrusion molding, injection molding, blow molding, compression molding, or wet molding. It is desirable that extrusion and injection molding can be easily performed, and in particular, in the case of precision molding for optical recording media, the intrinsic viscosity is preferably in the range of 0.30 to 0.50 dl / g.

In consideration of moldability, heat resistance and low birefringence, the structural unit of the general formula (A) of the present invention comprises all structural units.
5 to 40 mol% is preferred. 5 mol of structural units of general formula (A)
%, The effect of improving the birefringence is small, and if it exceeds 40 mol%, the molding conditions are narrowed due to an increase in the glass transition temperature, so that molding defects and an increase in birefringence due to molecular orientation are likely to occur.

Further, the content of the structural unit of the general formula (B) is preferably from 10 to 90 mol% in all the structural units. If the general formula (B) is less than 10 mol%, the effect of improving the fluidity is small, and if it exceeds 90 mol%, the fluidity is too high and the moldability is poor.

The polycarbonate molding material for an optical recording medium of the present invention is preferably molded by injection molding. If the fluidity is too large or too small, there is a problem in moldability. For example, Koka type flow tester (280 ° C, 160kgf / c
m ² , nozzle diameter 1mm x 10mm) measurement, 15 ~ 90 × 10 ^-2 cc / sec
Is preferable. If the flow rate is less than 15 × 10 ^-2 cc / sec, the fluidity is poor, and poor filling into the mold and flow marks may occur.If the flow rate exceeds 90 × 10 ^-2 cc / sec, mold release failure and warpage are likely to occur. .

The polycarbonate molding material for an optical recording medium of the present invention must be highly refined as in the case of a general polycarbonate for an optical disk. Specifically, dust having a diameter of 50 μm or more is substantially not detected, dust having a diameter of 0.5 to 50 μm is 3 × 10 ⁴ or less, inorganic and organic residual chlorine is 2 ppm or less, residual alkali metal is 2 ppm or less, and residual hydroxyl group Purification is performed so as to satisfy the criteria as low as possible, such as 200 ppm or less, residual nitrogen amount 5 ppm or less, and residual monomer 20 ppm or less. In some cases, post-treatment such as extraction is performed to remove low molecular weight substances or remove solvents.

The polycarbonate molding material for an optical recording medium may be a hindered phenol-based or phosphite-based antioxidant; silicone-based, fatty acid-based, if desired, in order to ensure the necessary stability and mold release during extrusion and injection molding. Lubricants and mold release agents such as ester, fatty acid, fatty acid glyceride, beeswax and other natural fats and oils; benzotriazole, benzophenone, dibenzoylmethane, and salicylate light stabilizers; polyalkylene glycol, fatty acid glyceride, etc. An antistatic agent or the like may be appropriately used in combination, and further, from the viewpoint of cost and the like, a general polycarbonate for optical recording media can be arbitrarily mixed and used as long as the performance is not impaired. The molding temperature for injection molding of the present molding material is preferably 280 to 360 ° C. from the viewpoint of fluidity.

[0031]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 To 58 liters of an aqueous 8.8% (w / v) sodium hydroxide solution was added 1,1'-
Bi-2-naphthol 2.86Kg (hereinafter abbreviated as BNP, 10mol)
6.92 kg of 4,4 '-[1,3-phenylenebis (1-methylethylidene)] bisphenol (hereinafter abbreviated as BPM, 20 mol) and 3.52 kg of bis (4-hydroxyphenyl) diphenylmethane (hereinafter abbreviated as BPBP, 10 mol) and Hydrosulfite 10g
Was added and dissolved. To this, 36 liters of methylene chloride was added, and 5 kg of phosgene was blown in over 50 minutes while stirring at 15 ° C. After completion of the blowing, 5 g (0.022 mol) of triethylbenzylammonium chloride was added, and the mixture was vigorously stirred for 5 minutes to emulsify the reaction solution. Then, 360 g of p-tert-butylphenol (hereinafter abbreviated as PTBP, 2.4 mol) was added.
Further, 20 ml of triethylamine (0.14 mol) was added, and about 1
After stirring for an hour, polymerization was carried out. The polymerization liquid was separated into an aqueous phase and an organic phase, the organic phase was neutralized with phosphoric acid, and the water washing was repeated until the conductivity of the washing liquid became 10 μS or less, to obtain a purified resin liquid.
The obtained purified resin liquid was slowly dropped into 45 ° C. hot water under vigorous stirring to solidify the polymer while removing the solvent. The solid was filtered and dried to obtain a white powdery polymer. This polymer has an intrinsic viscosity [η] at a temperature of 20 ° C. of a solution having a concentration of 0.5 g / dl using methylene chloride as a solvent.
It was 0.36 dl / g. The results obtained above polymer was analyzed from the infrared absorption spectrum, absorption by carbonyl group at the position in the vicinity of 1770 cm ^-1, observed absorption by ether bond position near 1240 cm ^-1, was confirmed to have a carbonate bond Was. Also, almost no absorption derived from hydroxyl groups was observed at the position of 3650 to 3200 cm ^-1 . When the monomers in this polycarbonate were measured by GPC analysis, all the monomers were 20 ppm or less. As a result of combining these, this polymer was recognized as a polycarbonate polymer composed of the following structural units.

[0033]

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[0034] 300 ppm of stearic acid monoglyceride was added to the obtained polycarbonate powder, and the resulting mixture was treated with a vented 50 mm extruder equipped with a 50 µm polymer filter.
C. and extruded to form a melt pellet. The obtained pellets were obtained at a resin temperature of 350 ° C., a mold temperature of 100 ° C., and an injection pressure of 29.4 MPa, with an outer diameter of 120 mm and a thickness of 1.
A 2 mm disk was injection molded, and after being left indoors for 2 days, the birefringence at 30 ° oblique incidence was measured. For the extruded pellets, the flow value (Q value) was measured and used as a measure of molding fluidity. For the polycarbonate powder, a cast film having a thickness of 50 μm was prepared, a load of 300 to 1100 g was applied, and the photoelastic sensitivity was measured. The results are shown in Table 1.

Example 2 The BNP was changed to 4,58 kg (16 mol), and 1,1-
Bis (4-hydroxyphenyl) cyclohexane 1.07Kg
(Hereinafter abbreviated as BPZ, 4 mol), and the same procedure as in Example 1 was carried out except that 797 g of p-heptadecanylphenol (hereinafter abbreviated as PHPDP, 2.4 mol) was used instead of PTBP. The intrinsic viscosity [η] of the obtained polymer was 0.37 dl / g, and the polymer was recognized as a polycarbonate polymer having the following structural units by infrared absorption spectrum analysis or the like. The results are shown in Table 1.

[0036]

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Example 3 BNP was changed to 2.29 kg (8 mol) and BPM was changed to 8.3 kg (24 mol), and instead of BPBP, 3.02 kg of 9,9-bis (3-methyl-4-hydroxyphenyl) fluorene (hereinafter BCF) was used. Abbreviated as 8mol)
The procedure was performed in the same manner as in Example 1 except that 466 g (hereinafter abbreviated as PHBB, 2.4 mol) of n-butyl p-hydroxybenzoate was used instead of PTBP. The intrinsic viscosity [η] of the obtained polymer was 0.35 dl / g, and the polymer was recognized as a polycarbonate polymer having the following structural units from infrared absorption spectra and the like. The results are shown in Table 1.

[0038]

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Example 4 BNP was changed to 1.14 kg (4 mol), BPM was changed to 11.07 kg (32 mol), and 6,6′-dihydroxy-3,3,3 ′, 3′- instead of BPBP.
1.23 kg of tetramethyl-1,1'-spirobiindane (hereinafter referred to as SPI
(Abbreviation: 4 mol). The intrinsic viscosity [η] of the obtained polymer was 0.35 dl / g, and the polymer was recognized as a polycarbonate polymer having the following structural units from infrared absorption spectra and the like. Table 1 shows the results
It was shown to.

[0040]

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Example 5 Instead of BPZ, 2.48 kg of 3,3,5-trimethyl-1,1-bis (4-hydroxyphenyl) cyclohexane (hereinafter abbreviated as TMZ, 8 mol) and 329 g (1.7 mol) of PHBB were used. The procedure was performed in the same manner as in Example 3 except for changing to. The intrinsic viscosity [η] of the obtained polymer was 0.48 dl / g, and the polymer was recognized as a polycarbonate polymer having the following structural unit from an infrared absorption spectrum or the like. The results are shown in Table 1.

[0042]

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Example 6 The BNP was changed to 2,86 kg (10 mol) and the BPM was changed to 3.46 kg (10 mol), and instead of BPBP, 5.80 kg (hereinafter referred to as 1,1-bis (4-hydroxyphenyl) -1-phenylethane) was used. Abbreviated as BPAP, 20mo
The procedure was the same as in Example 1 except that l) was used. The intrinsic viscosity [η] of the obtained polymer was 0.38 dl / g, and the polymer was recognized as a polycarbonate polymer having the following structural unit from an infrared absorption spectrum or the like. The results are shown in Table 1.

[0044]

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Comparative Example 1 In place of the polycarbonate of Example 1, 2,2-bis (4-hydroxyphenyl) propane (hereinafter referred to as a commercially available optical recording medium) was used.
BPA) type polycarbonate (Mitsubishi Gas Chemical Co., Ltd.)
Example 1 using H-4000 ([η] = 0.35dl / g).
The same test was performed. The results are shown in Table 1.

COMPARATIVE EXAMPLE 2 13.84 kg (40 mol) of BPM was used without using BNP or BPBP.
The procedure was performed in the same manner as in Example 1 except that PTBP was changed to 288 g (1.92 mol). The intrinsic viscosity [η] of the obtained polymer is 0.35 dl
/ g, the polymer was identified as a polycarbonate polymer having the following structural units from infrared absorption spectra and the like. The results are shown in Table 1.

[0047]

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Comparative Example 3 The same procedure as in Example 1 was carried out except that 11.44 kg (40 mol) of BNP was used without using BPBP or BPM. BNP has poor reactivity,
A large amount of unreacted monomer was generated. Intrinsic viscosity 0.25dl / g
And could not be molded due to insufficient strength.

[0049]

[Table 1]

[Explanation of Table 1] Birefringence: Automatic ellipsometer manufactured by Mizojiri Optical Co., Ltd.
Measurement wavelength: 632.8 nm. Flow value (Q value): Shimadzu Corporation's high-grade flow tester is used. Flow rate per unit time at 280 ° C, 160kgf / cm2, nozzle diameter 1mm x 10mm. (Unit × 10 ^-2 cc / sec) Photoelastic sensitivity: 300-1100g on a 50μm cast film
At a wavelength of 632.8 mm with an ellipsometer.
Measure photoelastic sensitivity. BNP: 1,1'-bi-2-naphthol BPM: 4,4 '-[1,3-phenylenebis (1-methylethylidene)] bisphenol BPBP: bis (4-hydroxyphenyl) diphenylmethane BPAP: 1,1- Bis (4-hydroxyphenyl) -1-phenylethane SPI: 6,6'-dihydroxy-3,3,3 ', 3'-tetramethyl-1,
1'-spirobiindane BCF: 9,9-bis (3-methyl-4-hydroxyphenyl) fluorene BPZ: 1,1-bis (4-hydroxyphenyl) cyclohexa TMZ: 3,3,5-trimethyl-1,1- Bis (4-hydroxyphenyl) cyclohexane BPA: 2,2-bis (4-hydroxyphenyl) propane BNP Concentration: Ratio of structural units of formula (A) to total structural units
(mol%). BPM concentration: The ratio of the formula (B) structural unit to all structural units
(mol%). Dihydric phenols: Dihydric phenols that derive the structural unit of the general formula (C). Intrinsic viscosity: 0.5g / 100cc dichloromethane resin solution at 20 ℃,
The intrinsic viscosity [η] (dl / g) was determined with a Huggins constant of 0.45.

[0051]

According to the present invention, it is possible to provide a molding material for an optical recording medium having both excellent moldability and low birefringence. In particular,
It is suitable for rewritable optical disks and magneto-optical disks that require high-density recording and reliability.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J029 AA09 AB07 AC02 AD01 AE05 BB13A BH04 DB07 DB10 DB13 HC01 JB171 JC021 5D029 KA07 KC07

Claims (6)

[Claims] 1. It has a structural unit represented by the general formula (A), the general formula (B) or the general formula (C), wherein the structural unit of the general formula (A) is 5 to 40 mol% in all the structural units. With intrinsic viscosity
A molding material for optical recording media comprising polycarbonate having a weight of 0.30 to 0.50 dl / g. Embedded image Embedded image Embedded image (W in the formula is R _{1 to} R ₄ are each independently hydrogen, fluorine, chlorine, bromine, iodine, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, An alkoxy group having 1 to 5 carbon atoms or 7 to 17 carbon atoms
Is an aralkyl group. However, when these groups have carbon, an alkyl group having 1 to 5 carbon atoms,
Substituted with an alkenyl group, an alkoxy group having 1 to 5 carbon atoms, a halogen selected from fluorine, chlorine, bromine and iodine, a dimethylpolysiloxy group and an alkylarylpolysiloxy group. Y is Wherein R ₅ and R ₆ are each independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or 6 to 12 carbon atoms.
Represents an aryl group, or R ₅ and R ₆ are linked together,
Represents a group forming a carbocyclic or heterocyclic ring. However, when these groups contain carbon, they are substituted with an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, fluorine, chlorine, bromine, and iodine. Including those that have been done. a is an integer of 0 to 20, b is 1 to 10
Represents an integer of 0. ) 2. The molding material for an optical recording medium according to claim 1, wherein the structural unit represented by the general formula (B) accounts for 10 to 90 mol% of all the structural units. 3. The structural unit represented by the general formula (C) is 1,1-
Bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl) diphenylmethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 9,9-bis (3-methyl-4-hydroxyphenyl) Fluorene, 3,
Claims derived from 3,5-trimethyl-1,1-bis (4-hydroxyphenyl) cyclohexane, 6,6'-dihydroxy-3,3,3 ', 3'-tetramethyl-1,1'-spirobiindane Item 1
The molding material for an optical recording medium according to the above. 4. The molding material for an optical recording medium according to claim 1, wherein the molecular terminal is derived from a monohydric phenol represented by the following general formula (D). Embedded image (Wherein, R ₇ represents an alkyl group having 4 to 20 carbon atoms;
_{8 to} R ₉ each independently represent hydrogen, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms. Z represents an ester group, an ether group, a carbonyl group, or simply represents a bond. ) 5. Blowing phosgene into bisphenols in the presence of an aqueous alkali solution and an organic solvent, adding a quaternary ammonium salt to start the polycondensation reaction, and then adding a monohydric phenol serving as a molecular weight regulator The method for producing a molding material for an optical recording medium according to claim 1, wherein a tertiary amine polymerization catalyst is further added to promote polycondensation. 6. The method for producing a molding material for an optical recording medium according to claim 5, wherein the quaternary ammonium salt is triethylbenzylammonium chloride or trimethylbenzylammonium chloride.