JP2000319376A - Molding material for optical recording media - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding material for an optical recording medium having excellent moldability and low birefringence. SOLUTION: The intrinsic viscosity obtained by reacting a compound having a general formula (A), 2,2-bis (4-hydroxyphenyl) propane and a phenolic hydroxyl group having three or more functional groups with a carbonate-forming compound is 0.3 to 0.3. 0.5 dl / g polycarbonate molding material for optical recording media. Embedded image (Wherein, R _{1 to} R ₄ are each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms,
Represents an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms or an aralkyl group having 7 to 17 carbon atoms. )

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 The present inventors have conducted intensive studies in order to solve the conventional problems, and as a result, have found that a copolymer derived from a specific bisphenol and a compound having a phenolic hydroxyl group having three or more functional groups. The present inventors have found that a polycarbonate resin is a high-quality optical recording medium molding material having both low birefringence and good moldability, and have completed the present invention.

[0007]

DETAILED DESCRIPTION OF THE INVENTION That is, the present invention provides a compound represented by the general formula (A):
The intrinsic viscosity obtained by reacting 2,2-bis (4-hydroxyphenyl) propane and a compound having three or more functional phenolic hydroxyl groups with a carbonate-forming compound has a limiting viscosity of 0.3 to 0.1.
It is a molding material for optical recording media made of polycarbonate, characterized by having a flow rate of 5 dl / g.

Embedded image (Wherein, R _{1 to} R ₄ are each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms,
Represents an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms or an aralkyl group having 7 to 17 carbon atoms. )

The present invention also relates to a compound having a general formula (A), 2,2-bis (4-hydroxyphenylene) propane and a compound having three or more phenolic hydroxyl groups in the presence of an alkaline aqueous solution and an organic solvent. After blowing phosgene, a quaternary ammonium salt is added to start a polycondensation reaction, and then a monohydric phenol as a molecular weight regulator is added.
A method for producing a molding material for an optical recording medium, comprising adding a secondary amine polymerization catalyst to promote polycondensation.

Examples of the carbonate-forming compound include phosgene, diphenyl carbonate, di-p-tolyl carbonate, phenyl-p-tolyl carbonate,
Examples include bisaryl carbonates such as di-p-chlorophenyl carbonate and dinaphthyl carbonate. These compounds can be used in combination of two or more.

Specific examples of the compound represented by the general formula (A) of the present invention include 9,9-bis (4-hydroxyphenyl) fluorene and 9,9-bis (3-methyl-4 -Hydroxyphenyl) fluorene, 3,6-dimethyl-9,9-bis (4-hydroxyphenyl) fluorene, 9,9- (3-methoxy-4-hydroxyphenyl) fluorene, 9,9-bis (3 -Ethoxy-4-hydroxyphenyl) fluorene, 9,9- (3-ethyl-4-hydroxyphenyl) fluorene, 4,5-dimethyl-
9,9-bis (4-hydroxyphenyl) fluorene, 9,9-
(3-phenyl-4-hydroxyphenyl) fluorene, 3,
Examples thereof include 6-dimethyl-9,9-bis (3-methyl-4-hydroxyphenyl) fluorene and 3,6-diphenyl-9,9-bis (4-hydroxyphenyl) fluorene.
Particularly, 9,9-bis (4-hydroxyphenyl) fluorene and 9,9-bis (3-methyl-4-hydroxyphenyl) fluorene are preferred.

The compounds having a phenolic hydroxyl group having three or more functional groups which act as a branching agent in the present invention include phloroglucin, 2,4,4'-trihydroxybenzophenone,
2,4,4'-trihydroxyfugenyl ether, 2,2-bis (2,4-dihydroxyphenyl) propane, 2,2 ', 4,4'-
Tetrahydroxydiphenylmethane, 2,4,4'-trihydroxydiphenylmethane, 2,4,6-tris (4-hydroxyphenyl) -2,6-dimethyl-heptene-3,2,4,6-tris (4-hydroxy Phenyl) -4,6-dimethyl-heptane-2,
2,6-bis (2-hydroxy-5-methylbenzyl) -4-methylphenol, 2,6-bis (2-hydroxy-5-isopropylbenzyl) -4-isopropylphenol, tetrakis (4-
Hydroxyphenyl) methane, α, α ', α "-tris (4-
(Hydroxyphenyl) -1,3,5-triisopropylbenzene, 4,4 ′-[1- [4- [1- (4-hydroxyphenyl) -1-methylethyl] phenyl] ethylidene] bisphenol,
1,1-tris (4-hydroxyphenyl) methane, 1,1,1-tris (4-hydroxyphenyl) ethane, 1,1,1-tris (4-hydroxyphenyl) propane, 1,1,1-tris (2-
Methyl-4-hydroxyphenyl) methane, 1,1,1-tris (2-methyl-4-hydroxyphenyl) ethane, 1,1,1-tris (3-methyl-4-hydroxyphenyl) methane, 1,1 ,
1-tris (3-methyl-4-hydroxyphenyl) ethane,
1,1,1-tris (3,5-dimethyl-4-hydroxyphenyl)
Methane, 1,1,1-tris (3,5-dimethyl-4-hydroxyphenyl) ethane, 1,1,1-tris (3-chloro-4-hydroxyphenyl) methane, 1,1,1-tris ( 3-chloro-4-hydroxyphenyl) ethane, 1,1,1-tris (3,5-dichloro-4-hydroxyphenyl) methane, 1,1,1-tris (3,5-
Dichloro-4-hydroxyphenyl) ethane, 1,1,1-tris (3-bromo-4-hydroxyphenyl) methane, 1,1,1-
Tris (3-bromo-4-hydroxyphenyl) ethane, 1,
1,1-tris (3,5-dibromo-4-hydroxyphenyl) methane, 1,1,1-tris (3,5-dibromo-4-hydroxyphenyl) ethane, 1,1,1-tris (3- Fluoro-4-hydroxyphenyl) methane, 1,1,1-tris (3-fluoro-4-hydroxyphenyl) ethane, 1,1,1-tris (3,5-difluoro-4-hydroxyphenyl) methane, 1 , 1,1-tris (3,5-difluoro-4-hydroxyphenyl) ethane,
Examples thereof include 1,1-tris (4-hydroxyphenyl) -1-phenylmethane. Among them, 1,1,1-tris (4-hydroxyphenyl) ethane, 4,4 ′-[1- [4- [1- (4-hydroxyphenyl) -1-methylethyl] phenyl] ethylidene]
Bisphenol and 2,4,6-tris (4-hydroxyphenyl) -2,6-dimethyl-3-heptene are most preferred from the viewpoint of reactivity and ease of handling.

Further, the compound having a trifunctional or higher phenolic hydroxyl group serving as a branching agent is represented by the general formula (A).
Total amount of 2,2-bis (4-hydroxyphenyl) propane 1
It is preferable to add 0.2 to 3.0 mol parts of a compound having a phenolic hydroxyl group having three or more functional groups to 00 mol parts. If it is less than 0.2 mol part, the fluidity improving effect is low,
If the molar part is exceeded, the impact resistance becomes poor. The amount of the general formula (A) used is 10 to 90 mol based on the total amount of the general formula (A) and 2,2-bis (4-hydroxyphenyl) propane from the viewpoint of polymerizability and processability. % Is preferred, 20-80
mol% is more preferred.

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

In the former phosgene method, a fluorene compound represented by the general formula (A), 2,2-bis (4-hydroxyphenyl) propane and a trifunctional or higher functional compound are generally used in the presence of an acid binder and a solvent. A compound having a phenolic hydroxyl group is 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 accelerate the polycondensation reaction. To control the degree of polymerization, a monofunctional compound such as phenols such as phenol, pt-butylphenol and p-cumylphenol is added as a molecular weight regulator. Further, if desired, a small amount of an antioxidant such as sodium sulfite or hydrosulfite may be added. The reaction is suitably carried out usually at a temperature in the range of 0 to 150 ° C, preferably 5 to 40 ° C. 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 higher.

On the other hand, in the latter transesterification method,
A fluorene compound represented by the general formula (A), 2,2-bis (4-hydroxyphenyl) propane and a compound having a phenolic hydroxyl group having three or more functional groups are mixed with a bisaryl carbonate and reacted at a high temperature under reduced pressure. Let it.
At this time, a monofunctional compound such as pt-butylphenol, p-cumylphenol and long-chain alkylphenol may be added as a molecular weight regulator. The reaction is usually 150
To 350 ° C., preferably 200 to 300 ° C., and the degree of reduced pressure is preferably adjusted to 1 mmHg or less. Phenols derived from the bisaryl carbonate generated by the transesterification reaction are removed. Distill 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. If desired, the reaction may be carried out by adding an antioxidant.

In the phosgene method and the transesterification method, the phosgene method is preferable in consideration of the reactivity of the fluorene compound represented by the general formula (A).

Further, as the molecular weight regulator of the present invention, monohydric phenols are particularly preferable, and specifically, butylphenol, octylphenol, nonylphenol, decanylphenol, tetradecanylphenol, heptadecanylphenol, octadecanylphenol Long-chain alkyl-substituted phenols such as phenol; long-chain alkyl esters of hydroxybenzoic acid such as butyl hydroxybenzoate, octyl hydroxybenzoate, nonyl hydroxybenzoate, decanyl hydroxybenzoate, and heptadecanyl hydroxybenzoate; butoxyphenol, octyloxyphenol, Long-chain alkyl such as nonyloxyphenol, decanyloxyphenol, tetradecanyloxyphenol, heptadecanyloxyphenol, octadecanyloxyphenol Alkoxy phenols are exemplified.

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, and wet molding. It is desirable that extrusion and injection molding can be carried out easily, and particularly in the case of precision molding for optical recording media, the intrinsic viscosity is preferably in the range of 0.3 to 0.5 dl / g.

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; 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 furthermore, it is also possible to mix and use the polycarbonate with a general polycarbonate for an optical recording medium arbitrarily from the viewpoint of cost and the like 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.

[0023]

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 2.58 kg of 9,9-bis (4-hydroxyphenyl) fluorene was added 58 g of an 8.8% (w / v) aqueous sodium hydroxide solution.
FL, abbreviated as 8 mol), 2,2- (4-hydroxyphenyl) propane 7.31 kg (abbreviated as BPA, 32 mol), 1,1,1-tris (4-hydroxyphenyl) ethane 122.4 g (abbreviated as THPE) , 0.4 mol) and 10 g of hydrosulfite. 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 the 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.
Of triethylamine (0.14 mol) was added, and the mixture was stirred for about 1 hour to carry out polymerization. After the completion of the polymerization, 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 0.35 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.

To the obtained polycarbonate powder, 300 ppm of stearic acid monoglyceride was added, and the 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. The flow value (Q value) of the extruded pellet was measured and used as a measure of molding fluidity. Further, a cast film having a thickness of 50 μm was prepared using polycarbonate powder, and a photoelastic sensitivity was measured by applying a load of 300 to 1100 g. The results are shown in Table 1.

Example 2 BPFL to 6.99 kg (20 mol), BPA to 4.57 kg (20 mol), P
The procedure was performed in the same manner as in Example 1 except that TBP was changed to 558 g (3.72 mol). The intrinsic viscosity [η] of the obtained polymer is 0.37 dl
/ g, it was confirmed by infrared absorption spectrum analysis and the like that this polymer had the same polycarbonate polymer structure as in Example 1 except for the polymerization ratio. The results are shown in Table 1.

Example 3 BPFL was added to 9.79 kg (28 mol), BPA was added to 2.74 kg (12 mol), and P
The procedure was performed in the same manner as in Example 1 except that TBP was changed to 546 g (3.64 mol). The intrinsic viscosity [η] of the obtained polymer is 0.39 dl / g
From the infrared absorption spectrum and the like, it was confirmed that this polymer had the same polycarbonate polymer structure as in Example 1 except for the polymerization ratio. The results are shown in Table 1.

Example 4 Instead of BPFL, 7.55 kg (hereinafter, abbreviated as BCF, 20 mol) of 9,9-bis (3-methyl-4-hydroxyphenyl) fluorene was used, and 4.57 kg (20 mol) of BPA and THPE were used. 244.8g (0.8mol)
Example 1 except that PTBP was changed to 618 g (4.12 mol)
The same was done. The intrinsic viscosity [η] of the obtained polymer is 0.1.
At 39 dl / g, it was confirmed from infrared absorption spectrum and the like that this polymer had the same polycarbonate polymer structure as in Example 1 except for the polymerization ratio. The results are shown in Table 1.

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 BPFL to 419 g (1.2 mol), BPA to 8.86 kg (38.8 mol)
The procedure was performed in the same manner as in Example 1 except that PTBP was changed to 558 g (3.72 mol). The intrinsic viscosity [η] of the obtained polymer is 0.34 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.

Comparative Example 3 Without BPA, using only 13.98 kg (40 mol) of BPFL, and
The same operation as in Example 1 was carried out except that the amount was changed to 6 g (2.44 mol). Due to poor reactivity with phosgene, polymerization did not proceed and physical properties could not be evaluated.

[0032]

[Table 1]

[Explanation of Table 1] Birefringence: Automatic ellipsometer manufactured by Mizojiri Optical Co., Ltd.
Measurement wavelength: 632.8 nm. Photoelasticity: A load of 300 to 1100 g was applied to a cast film having a thickness of 50 μm, and photoelastic sensitivity was measured at an ellipsometer wavelength of 632.8 nm. Flow value (Q value): Shimadzu Corporation's high-grade flow tester is used. 280 ℃, 160kgf / cm ^2, the flow rate per unit time in the nozzle diameter 1 mm × 10 mm conditions. (Unit × 10 ^-2 cc / sec) BPFL: 9,9-bis (4-hydroxyphenyl) fluorene BCF: 9,9-bis (3-methyl-4-hydroxyphenyl) fluorene BPA: 2,2 (4- (Hydroxyphenyl) propane THPE: 1,1,1-tris (4-hydroxyphenyl) ethane BP component (a): ratio (mol%) of the general formula (A) to the total amount of the general formula (A) and BPA. BP component (b): ratio (mol%) of BPA to the total amount of general formula (A) and BPA. 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.

[0034]

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 (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 7/24 526 G11B 7/24 526G (72) Inventor Noriaki Honda 2--12 Kanshu-cho, Toyonaka-shi, Osaka F-term in Osaka Plant of Mitsubishi Gas Chemical Co., Ltd. (reference) 4J029 AB01 AD01 AE05 BB13A BC09 FC33 HC01 HC02 JC053 JC091 JD05 KB11 KB12 KB13 KB17 KB22 5D029 KA07 KC07

Claims (7)

[Claims] An intrinsic viscosity obtained by reacting a compound having general formula (A), 2,2-bis (4-hydroxyphenyl) propane, a phenolic hydroxyl group having three or more functional groups with a carbonate-forming compound is 0.3. A molding material for an optical recording medium, comprising a polycarbonate having a weight of 0.5 dl / g. Embedded image (Wherein, R _{1 to} R ₄ are each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms,
Represents an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms or an aralkyl group having 7 to 17 carbon atoms. ) 2. The compound of formula (A) and 2,2-bis (4-hydroxyphenyl) propane have a total amount of 3
A compound having a phenolic hydroxyl group with a functionality of 0.2 or more
The molding material for an optical recording medium according to claim 1, wherein 3.0 mole parts are added. 3. The compound having a phenolic hydroxyl group having three or more functional groups is 1,1,1-tris (4-hydroxyphenyl) ethane, 4,4 ′-[1- [4- [1- (4-hydroxy Phenyl) -1-methylethyl] phenyl] ethylidene] bisphenol,
2. The molding material for an optical recording medium according to claim 1, wherein the molding material is at least one selected from the group consisting of and 2,4,6-tris (4-hydroxyphenyl) -2,6-dimethyl-3-heptene. 4. A compound represented by the general formula (A), wherein 9,9-bis (4-hydroxyphenyl) fluorene and / or 9,9-bis (3-methyl-
The molding material for an optical recording medium according to claim 1, which is 4-hydroxyphenyl) fluorene. 5. After blowing phosgene into a compound having a general formula (A), 2,2-bis (4-hydroxyphenylene) propane and a compound having three or more phenolic hydroxyl groups in the presence of an aqueous alkali solution and an organic solvent. Adding a quaternary ammonium salt to start a polycondensation reaction, then adding a monohydric phenol as a molecular weight regulator, and further adding a tertiary amine polymerization catalyst to promote polycondensation. A method for producing a molding material for an optical recording medium according to claim 1. 6. A monohydric phenol serving as a molecular weight regulator and 3
The method for producing a molding material for an optical recording medium according to claim 5, wherein a secondary amine polymerization catalyst is simultaneously added. 7. 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.