JP2002146210A - Colored master pellet for optical molded article, and optical disc base plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a colored master pellet for an optical molded article, which is excellent in a design feature, makes it possible to instantaneously judge its kinds, uses, or the like, scarcely causes fading, irregularity in color, colored streaks, and the like, when used for molding an optical disc base plate, and gives high long-term reliability, and an optical disc base plate. SOLUTION: The colored master pellet consists of a thermoplastic resin (A) and a coloring agent (B), and it contains foreign matters having a particle diameter of 200 μm or larger in an amount of at most one piece for 1 kg of the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a colored master pellet for optical molded articles. In detail, it is excellent in design and its type and application can be judged instantaneously, and when an optical molded product such as an optical disk substrate is molded, there are few fading phenomena, color unevenness, color streaks, etc. The present invention relates to a highly reliable colored master pellet for an optical molded product and an optical disk substrate, which does not cause a polarization defect (white defect) even in an environment, has few errors, and has high reliability.

[0002]

2. Description of the Related Art Polycarbonate resins are excellent in heat resistance and low water absorption, and particularly excellent in transparency, and are therefore used as optical molding products, particularly as substrate materials for optical disks such as compact disks and magneto-optical disks. An optical disc is required to have optical uniformity in order to record and reproduce information by laser light using micron-sized irregularities formed on the substrate. By the way, factors that affect the optical uniformity of the substrate include foreign substances (dust, carbide, etc.) mixed in from various routes in all processes from manufacturing a polycarbonate resin from a raw material to molding an optical disk substrate. ) And local hydrolysis of the substrate occurring in a high-temperature, high-humidity environment.

[0003] For this reason, conventionally, foreign substances in raw materials have been reduced by filtering them with a filter in a purification step, a granulation step, or the like.
5, JP-A-63-91231, JP-B-7-1096
A technique as described in No. 55 or the like has been proposed.

On the other hand, as a method of coloring an optical recording medium, Japanese Patent Application Laid-Open No. 1-102505, which uses a fully deposited pellet, discloses an orange optical recording medium comprising a specific dye.
JP-A-2-33742 and JP-A-8-12242
No. 12 proposes a black optical recording medium. Further, Japanese Patent Application Laid-Open No. Hei 7-262606 proposes a colored optical disk using an extremely low-density colored master pellet.

However, in the case of a colored master pellet having a relatively high coloring density of an optical molded product, a transparent pellet,
The influence of the foreign matter of a specific size present in the colored pellets is greater than that of the completely deposited pellets or the extremely low-concentration colored master pellets. A new problem has arisen in which generation, deterioration of electrical characteristics, and the like occur.

[0006] On the other hand, the transparent pellets, the fully deposited pellets, and the extremely low-concentration colored master pellets described in the above-mentioned publications are not enough to solve the above-mentioned problems caused by the coloring master.

[0007]

DISCLOSURE OF THE INVENTION The present invention has excellent design properties, and its type and use can be determined instantaneously. In addition, when an optical molded product such as an optical disk substrate is molded, a discoloration phenomenon, color unevenness, etc. The present invention relates to a highly reliable colored master pellet for optical molded articles, which has little color streaks, does not cause polarization defects (white defects) even in a high-temperature, high-humidity environment, has few errors, and has extremely low reliability. In particular, it is an object of the present invention to provide a colored master pellet for an optical disk which optically reads an information signal by a laser beam. The present inventors have conducted intensive studies in order to achieve such an object, and as a result, have found that a colored master pellet satisfying specific conditions can achieve the object of the present invention, and have completed the present invention.

[0008]

The present invention is directed to a colored master pellet comprising a thermoplastic resin (component A) and a coloring agent (component B), wherein the pellet removes foreign substances having a particle size of 200 μm or more by 1 kg of the resin. Per colored master pellet for optical molded articles, characterized by containing not more than one per unit.

The optical molded product according to the present invention includes a lens, an optical card, an optical fiber, an optical disk and the like, and an optical disk is particularly preferable. Such an optical disk is an optical disk that records and reproduces information by irradiating a so-called laser beam. Specific examples include digital audio discs (so-called compact discs: CDs), C
D-ROM, optical video disk (so-called laser disk), DVD-ROM, digital video disk (DVD-video), DVD-R, CD-R, M
Various read-only disks such as O, MD-MO, PD, and DVD-RAM, write-once disks, magneto-optical disks, phase change disks, and the like have been put to practical use. The colored master pellet of the present invention is particularly suitable for DVD-ROM, DVD-video.
o, DVD-R, DVD-RAM, etc., are useful for manufacturing digital versatile discs, which are high-density optical discs.

The thermoplastic resin which is the component A of the present invention is selected from aromatic polycarbonate resin, amorphous polyolefin resin, acrylic resin, hydrogenated polystyrene resin, amorphous polyester resin, amorphous polyarylate resin and the like. Can be preferably mentioned thermoplastic resin,
More preferably, it is an aromatic polycarbonate resin or an amorphous polyolefin resin. As the amorphous polyolefin resin, APO resin manufactured by Mitsui Chemicals, Inc., JSR
Arton manufactured by ZEON CORPORATION, ZEONEX manufactured by ZEON CORPORATION, and HPS resin manufactured by Dow can be mentioned. Particularly, an aromatic polycarbonate resin is preferable. The details of the aromatic polycarbonate resin will be described later.

The coloring agent used as the component B in the present invention includes perylene dyes, coumarin dyes, thioindigo dyes, anthraquinone dyes, thioxanthone dyes, ferrocyanides such as navy blue, perinone dyes, and quinoline. Organic dyes such as organic dyes, quinacridone dyes, dioxazine dyes, isoindolinone dyes, and phthalocyanine dyes, and carbon black. Transparent organic colorants are preferable among these. More preferred are anthraquinone dyes, perinone dyes, quinoline dyes, perylene dyes, coumarin dyes, and thioindigo dyes.

Specific examples of the component B dye include CI S
solvent Red 52, CISolvent R
ed 149, CI Solvent Red 15
0, CI Solvent Red 191, CI S
solvent Red 151, CI Solvent
Blue 94, CI Solvent 97, CI
Solvent Violet 13, CI Sol
vent Violet 14, CI Solvent
Green 3, CI Solvent Green
Anthraquinone dye known as CI 28, CI V
at Orange 9, CI Vat Orange
2. Pyranthrone anthraquinone dyes known as CI Vat Orange 4, isodibenzanthrone anthraquinone dyes, CI Vat Ora
and dibenzpyrene quinones known as CI Neg. As thioindigo dyes, CI Vat Red 2, CI Vat Red 4
1, CI Vat Red 47, and the like. As perylene dyes, CI Vat Red
15, CI Vat Orange 7, and BA
SForg's LUMOGEN series FOrange
e240, F Red300, F Red305, F
Yellow083, FRed339 and the like can be mentioned. Coumarin dyes include Bayer M
ACROLEX Fluorescent Yellow
10GN (Solvent Yellow160:
1), MACROLEX Fluorescent R
ed G, quinoline dyes include CI Solve
nt Yellow 33, CI Solvent Y
yellow 157, CIsolvent Yellow
w 54, CI Disperse Yellow 1
60 and the like. As for perinone dyes, CI Solvent Red 135, CI S
solvent Red 179, CI Solvent
Orange 60, phthalocyanine dyes include CI Pigment Blue 15: 3, CI P
iigment Green 7, CI Pigment
Green 36 and the like. These can be used alone or in combination of two or more, and can be colored according to the purpose.

The colorant preferably has a small particle size in order to achieve sufficiently uniform dispersion, and more preferably 50.
It has a particle size of not more than μm, and such a colorant can be obtained by sorting with various filters.

The proportion of the component A and the component B of the present invention is preferably 0.005 to 10 parts by weight based on 100 parts by weight of the component A. In such a range, when the optical recording medium is used, it has a sufficient color saturation, and it is possible to perform coloring with rich design, and when an optical molded article such as an optical disk substrate is molded, the optical recording medium is exposed to a high temperature and high humidity environment. Even if there is no polarization defect (white defect), an error-free and extremely reliable optical molded product can be obtained. The ratio of the component B is more preferably 0.01 to 10 parts by weight, particularly preferably 0.0 to 10 parts by weight, per 100 parts by weight of the component A.
5 to 5 parts by weight.

The colored master pellet of the present invention can be produced by various methods. For example, colorants are preliminarily mixed, (1) a method of uniformly mixing and then kneading with a thermoplastic resin, and (2) a single or a plurality of colorants are added to the resin at a high concentration, and a Henschel mixer or the like is used. A method in which a dry-blended master agent is obtained using a mixer, and then preliminarily mixed with the remaining thermoplastic resin and melt-kneaded. (3) The colorant is independently added to a melt-kneader such as an extruder. (4) a method of dissolving a colorant in an organic solvent and then directly supplying it to a melt kneader (preferably, a colorant solution is filtered); (5) Coloring of the above (4) (6) a method in which a master agent is prepared by adding a high-concentration solution to a resin at a high concentration to prepare a master agent with a mixer such as a Henschel mixer, and then melt-kneaded with the remaining components.
(5) a method in which the master agent is independently supplied to a melt kneader such as an extruder and melt kneaded; (7) a colorant solution and a thermoplastic resin solution are mixed (the solution is preferably filtered. ), A method of melt-extruding the powder from which the solvent has been removed with a spray dryer or the like, and (8) a method of directly supplying a mixed solution of such a colorant solution and a thermoplastic resin solution to a melt kneader such as an extruder. it can. After the pellets are obtained by such melt-kneading, the resulting mixture is diluted with transparent pellets to a desired concentration to form an optical molded product. The dilution ratio is 2
It is preferably 30 times, more preferably 3 to 20 times, and most preferably 3 to 10 times.

In the production of the above-mentioned colored master pellets for optical molded articles, since such colored master pellets usually require high optical properties, it is preferable to minimize the presence of foreign substances which inhibit such optical properties. . In order to obtain such a preferable colored master pellet, a material having a small amount of foreign matter is used as a raw material, and a manufacturing device such as an extruder or a pelletizer is installed in a clean air atmosphere obtained through a filter or the like, and cooled. For the cooling water for the bath, use water with a small amount of foreign matter such as metal ions obtained through ion exchange resin, etc.
Further, it is preferable that the supply hopper, the supply flow path, the storage tank for the obtained pellets, and the like of the raw material are also filled with clean air.

As the apparatus used for melt kneading, those generally used such as a single screw extruder, a twin screw extruder, and a pressure kneader can be used, and a vented twin screw extruder is particularly preferable. Yes, those that can be evacuated from the vent are preferred. Raw materials to be used can be used in any of a tumbler, a blender, a Nauta mixer, a Banbury mixer, a method of premixing with a kneading roll, etc., and a method of independently supplying using a measuring instrument, and may be used in combination. It is possible.

As a method for obtaining a molded article from the colored master pellet of the present invention, various conventionally known methods can be used.
For example, it can be formed into a desired shape by a method such as injection molding, extrusion molding, or compression molding. The colored master pellet for an optical molded article of the present invention is suitable not only for a disk-shaped optical recording medium represented by a DVD but also for a plate-shaped molded article such as an optical card, and other bonding having an optical recording medium function. This is suitable for various types of recording media.
That is, the colored master pellets for optical molded products of the present invention are excellent in fluidity, heat resistance, specific light transmittance, and further excellent in designability and discrimination, especially for various video software,
It is suitable as an optical recording medium substrate for computer software and game machine software.

The details of the aromatic polycarbonate resin suitable as the component A of the present invention will be described below. The aromatic polycarbonate resin used in the present invention is usually obtained by reacting a dihydric phenol with a carbonate precursor by an interfacial polycondensation method or a melt transesterification method, or a solid phase transesterification method of a carbonate prepolymer. Or a compound obtained by polymerizing a cyclic carbonate compound by a ring-opening polymerization method.

Representative examples of the dihydric phenol used here include hydroquinone, resorcinol, 4,4
4'-dihydroxydiphenyl, bis (4-hydroxyphenyl) methane, bis {(4-hydroxy-3,5-
Dimethyl) phenyl @ methane, 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 2,2-bis (4
-Hydroxyphenyl) propane (commonly known as bisphenol A), 2,2-bis} (4-hydroxy-3-methyl)
Phenyl {propane, 2,2-bis {(4-hydroxy-3,5-dimethyl) phenyl} propane, 2,2-bis {(3-isopropyl-4-hydroxy) phenyl}
Propane, 2,2-bis {(4-hydroxy-3-phenyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) -3,3-dimethylbutane, 2,4
-Bis (4-hydroxyphenyl) -2-methylbutane, 2,2-bis (4-hydroxyphenyl) pentane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1-bis (4 -Hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -4-isopropylcyclohexane, 1,1-
Bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis {(4-hydroxy-3-methyl) phenyl} fluorene, α , Α'-bis (4-hydroxyphenyl) -o-diisopropylbenzene, α, α'-bis (4-hydroxyphenyl) -m
-Diisopropylbenzene, α, α'-bis (4-hydroxyphenyl) -p-diisopropylbenzene, 1,
3-bis (4-hydroxyphenyl) -5,7-dimethyladamantane, 4,4′-dihydroxydiphenylsulfone, 4,4′-dihydroxydiphenylsulfoxide, 4,4′-dihydroxydiphenylsulfide,
4,4'-dihydroxydiphenyl ketone, 4,4'-
Examples thereof include dihydroxydiphenyl ether and 4,4′-dihydroxydiphenyl ester, and these can be used alone or as a mixture of two or more.

Bisphenol A, 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane,
2,2-bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl)-
3,3-dimethylbutane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1-bis (4
A homopolymer obtained from at least one bisphenol selected from the group consisting of -hydroxyphenyl) -3,3,5-trimethylcyclohexane and α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene, or Copolymers are preferred. In particular, bisphenol A homopolymer and 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane and bisphenol A, 2,2-bis {(4-hydroxy- Copolymers with 3-methyl) phenyl} propane or α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene are preferably used, and in particular, a homopolymer of bisphenol A or 1,1-bis ( 4-hydroxyphenyl) -3,3,5-trimethylcyclohexane and α, α'-bis (4 Hydroxyphenyl) -m
-Copolymers with diisopropylbenzene are preferred.

As the carbonate precursor, carbonyl halide, carbonate ester, haloformate and the like are used, and specific examples include phosgene, diphenyl carbonate and dihaloformate of dihydric phenol.

In producing the polycarbonate resin by reacting the above-mentioned dihydric phenol with the carbonate precursor by the interfacial polycondensation method or the melt transesterification method, if necessary, a catalyst, a terminal stopper and an oxidation of the dihydric phenol may be carried out. An inhibitor or the like may be used. Further, the polycarbonate resin may be a branched polycarbonate resin obtained by copolymerizing a trifunctional or higher polyfunctional aromatic compound, or a polyester carbonate resin obtained by copolymerizing an aromatic or aliphatic bifunctional carboxylic acid, Further, a mixture of two or more of the obtained polycarbonate resins may be used.

Examples of the trifunctional or higher polyfunctional aromatic compound include phloroglucin, phloroglucid, and 4,6-
Dimethyl-2,4,6-tris (4-hydroxydiphenyl) heptene-2,2,4,6-trimethyl-2,4
6-tris (4-hydroxyphenyl) heptane, 1,
3,5-tris (4-hydroxyphenyl) benzene,
1,1,1-tris (4-hydroxyphenyl) ethane, 1,1,1-tris (3,5-dimethyl-4-hydroxyphenyl) ethane, 2,6-bis (2-hydroxy-5-methylbenzyl) ) -4-Methylphenol, 4
-{4- [1,1-bis (4-hydroxyphenyl) ethyl] benzene} -α, α-dimethylbenzylphenol and other trisphenols, tetra (4-hydroxyphenyl) methane, bis (2,4-dihydroxyphenyl) )
Examples thereof include ketone, 1,4-bis (4,4-dihydroxytriphenylmethyl) benzene, trimellitic acid, pyromellitic acid, benzophenonetetracarboxylic acid, and acid chlorides thereof, among which 1,1,1-tris (4-hydroxyphenyl) ethane, 1,1,1-
Tris (3,5-dimethyl-4-hydroxyphenyl)
Ethane is preferred, and 1,1,1-tris (4-hydroxyphenyl) ethane is particularly preferred.

When a polyfunctional compound which produces such a branched polycarbonate resin is contained, the proportion is preferably from 0.001 to 1 mol%, more preferably from 0.005 to 0.5 mol%, particularly preferably from the total amount of the aromatic polycarbonate. 0.01
~ 0.3 mol%. In addition, particularly in the case of the melt transesterification method, a branched structure may be generated as a side reaction, and the amount of such a branched structure is also 0.001 to 1 mol%, preferably 0.005 to 5 mol%, of the total amount of the aromatic polycarbonate.
0.5 mol%, particularly preferably 0.01 to 0.3 mol%
Is preferred. The ratio is ¹ H
-It can be calculated by NMR measurement.

The reaction by the interfacial polycondensation method is usually a reaction between dihydric phenol and phosgene, and is carried out in the presence of an acid binder and an organic solvent. As the acid binder, for example, an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide or an amine compound such as pyridine is used.
As the organic solvent, for example, halogenated hydrocarbons such as methylene chloride and chlorobenzene are used. Further, for promoting the reaction, for example, a catalyst such as a tertiary amine such as triethylamine, tetra-n-butylammonium bromide, or tetra-n-butylphosphonium bromide, a quaternary ammonium compound, or a quaternary phosphonium compound may be used. it can. At that time, the reaction temperature is usually 0 to 40 ° C., the reaction time is preferably about 10 minutes to 5 hours, and the pH during the reaction is preferably maintained at 9 or more.

In such a polymerization reaction, a terminal stopper is usually used. Monofunctional phenols can be used as such a terminal stopper. Monofunctional phenols are commonly used as molecular terminators for molecular weight control, and the resulting polycarbonate resins are capped by groups based on monofunctional phenols, so that Excellent heat stability. Such a monofunctional phenol is generally a phenol or a lower alkyl-substituted phenol, and may be a monofunctional phenol represented by the following general formula (1).

[0028]

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(Where A is a hydrogen atom or a carbon number of 1 to 9)
Is a linear or branched alkyl group or a phenyl group-substituted alkyl group, and r is an integer of 1 to 5, preferably 1 to 3. )

Specific examples of the above monofunctional phenols include phenol, p-tert-butylphenol, p-cumylphenol and isooctylphenol.

Other monofunctional phenols include:
Phenols or benzoic acid chlorides having a long-chain alkyl group or aliphatic polyester group as a substituent, or long-chain alkylcarboxylic acid chlorides can also be used. Among these, phenols having a long-chain alkyl group represented by the following general formulas (2) and (3) as a substituent are preferably used.

[0032]

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[0033]

Embedded image

(Wherein X is -RO-, -R-CO-O
— Or —RO—CO—, wherein R represents a single bond or a divalent aliphatic hydrocarbon group having 1 to 10, preferably 1 to 5 carbon atoms, and n represents an integer of 10 to 50. Show. )

As the substituted phenols of the general formula (2), those having n of 10 to 30, especially 10 to 26, are preferred. Specific examples thereof include decylphenol, dodecylphenol, tetradecylphenol, hexadecylphenol and Octadecylphenol, eicosylphenol, docosylphenol, triacontylphenol and the like can be mentioned.

As the substituted phenols of the general formula (3), compounds wherein X is -R-CO-O- and R is a single bond are suitable, and n is 10-30, especially 10-26.
Are preferred, and specific examples thereof include, for example, decyl hydroxybenzoate, dodecyl hydroxybenzoate,
Examples include tetradecyl hydroxybenzoate, hexadecyl hydroxybenzoate, eicosyl hydroxybenzoate, docosyl hydroxybenzoate and triacontyl hydroxybenzoate.

It is desirable that the terminal terminator is introduced at least at 5 mol%, preferably at least 10 mol%, based on all terminals of the obtained polycarbonate resin. More preferably, the terminal terminator is introduced in an amount of 80 mol% or more with respect to all terminals, that is, the terminal hydroxyl group (OH group) derived from dihydric phenol is more preferably 20 mol% or less, and particularly preferably. This is the case when 90 mol% or more of the terminal terminator is introduced to all the terminals, that is, when the OH group is 10 mol% or less. Further, the terminal stoppers may be used alone or in combination of two or more.

The reaction by the melt transesterification method is usually a transesterification reaction between a dihydric phenol and a carbonate ester, and is produced by mixing the dihydric phenol with the carbonate ester while heating in the presence of an inert gas. It is performed by a method of distilling alcohol or phenol. The reaction temperature varies depending on the boiling point of the produced alcohol or phenol, but is usually in the range of 120 to 350 ° C. In the late stage of the reaction, the system was adjusted to 1.33 × 10 ³ -1.
The alcohol or phenol produced by reducing the pressure to about 3.3 Pa is easily distilled. Reaction time is usually 1-4
About an hour.

Examples of the carbonate ester include an optionally substituted ester such as an aryl group having 6 to 10 carbon atoms, an aralkyl group, or an alkyl group having 1 to 4 carbon atoms. Specifically, diphenyl carbonate, bis (chlorophenyl) carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate, dimethyl carbonate, diethyl carbonate, dibutyl carbonate and the like can be mentioned, with diphenyl carbonate being preferred.

A polymerization catalyst can be used to increase the polymerization rate. Examples of the polymerization catalyst include sodium hydroxide, potassium hydroxide, alkali metal compounds such as sodium and potassium salts of dihydric phenol, and water. Alkaline earth metal compounds such as calcium oxide, barium hydroxide and magnesium hydroxide; nitrogen-containing basic compounds such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, trimethylamine and triethylamine; alkoxides of alkali metals and alkaline earth metals Manganese, organic acid salts of alkali metals and alkaline earth metals, zinc compounds, boron compounds, aluminum compounds, silicon compounds, germanium compounds, organic tin compounds, lead compounds, osmium compounds, antimony compounds Compounds, titanium compounds, usually the esterification reaction, such as zirconium compounds, there can be used a catalyst used in the transesterification reaction. The catalyst may be used alone or in combination of two or more. The amount of these polymerization catalysts to be used is preferably 1 × 10 ⁻⁸ to 1 ×, based on 1 mol of the starting dihydric phenol.
It is selected in the range of 10 ⁻³ equivalents, more preferably 1 × 10 ^{−7 to} 5 × 10 ⁻⁴ equivalents.

In the polymerization reaction, in order to reduce the number of phenolic terminal groups, for example, bis (chlorophenyl) carbonate, bis (bromophenyl) carbonate, bis (nitrophenyl) carbonate is used later or after completion of the polycondensation reaction. , Bis (phenylphenyl)
Carbonate, chlorophenylphenyl carbonate,
It is preferable to add compounds such as bromophenylphenyl carbonate, nitrophenylphenyl carbonate, phenylphenyl carbonate, methoxycarbonylphenylphenyl carbonate, and ethoxycarbonylphenylphenyl carbonate. Of these, 2-chlorophenylphenyl carbonate, 2-methoxycarbonylphenylphenyl carbonate and 2-ethoxycarbonylphenylphenyl carbonate are preferred, and 2-methoxycarbonylphenylphenyl carbonate is particularly preferred.

Further, it is preferable to use a deactivator for neutralizing the activity of the catalyst in such a polymerization reaction. Specific examples of this deactivator include, for example, benzenesulfonic acid, p-toluenesulfonic acid, methylbenzenebenzenesulfonic acid, ethylbenzenebenzenesulfonic acid, butylbenzenesulfonic acid, octylbenzenesulfonic acid, phenylbenzenebenzenesulfonic acid, p-toluenesulfonic acid. Sulfonates such as methyl acrylate, ethyl p-toluenesulfonate, butyl p-toluenesulfonate, octyl p-toluenesulfonate, and phenyl p-toluenesulfonate; further, trifluoromethanesulfonic acid, naphthalenesulfonic acid, and sulfonated polystyrene , Methyl acrylate-sulfonated styrene copolymer, 2-phenyl-2-propyl dodecylbenzenesulfonic acid, dodecylbenzenesulfonic acid-2-
Phenyl-2-butyl, tetrabutylphosphonium octylsulfonate, tetrabutylphosphonium decylsulfonate, tetrabutylphosphonium benzenesulfonate, tetraethylphosphonium dodecylbenzenesulfonate, tetrabutylphosphonium dodecylbenzenesulfonate, dodecylbenzenesulfonate Acid tetrahexyl phosphonium salt, dodecyl benzene sulfonic acid tetraoctyl phosphonium salt, decyl ammonium butyl sulfate, decyl ammonium decyl sulfate, dodecyl ammonium methyl sulfate, dodecyl ammonium ethyl sulfate, dodecyl methyl ammonium methyl sulfate, dodecyl dimethyl ammonium tetradecyl sulfate, tetradecyl Dimethyl ammonium Chill sulfate, tetramethylammonium hexyl sulfate, decyltrimethylammonium hexadecyl sulfate, tetrabutylammonium dodecylbenzyl sulfate, tetraethylammonium dodecylbenzyl sulfate, there may be mentioned compounds such as tetramethylammonium dodecylbenzyl sulfate, and the like. Two or more of these compounds can be used in combination.

Among the deactivators, those of the phosphonium salt or ammonium salt type are preferred. The amount of the deactivator is preferably 0.5 to 50 mol per 1 mol of the remaining catalyst, and 0.01 to 500 ppm, more preferably, to the polycarbonate resin after polymerization. Is used at a ratio of 0.01 to 300 ppm, particularly preferably 0.01 to 100 ppm.

The polycarbonate resin has a viscosity average molecular weight (M) of preferably 10,000 to 22,000, more preferably 12,000 to 20,000, and more preferably 1 to 20,000.
3,000 to 18,000 is more preferred, and 13,50
0 to 16,500 is particularly preferred. An aromatic polycarbonate resin having such a viscosity-average molecular weight is preferable because it has sufficient strength as an optical material, has good melt flow during molding, and does not generate molding distortion. Further, two or more aromatic polycarbonate resins may be mixed. The viscosity average molecular weight referred to in the present invention is 100 methylene chloride.
The specific viscosity (η _SP ) obtained from a solution in which 0.7 g of a polycarbonate resin is dissolved in 20 ml at 20 ° C. is inserted into the following equation. η _SP /c=[η]+0.45×[η] ² c (where [η]
Is the intrinsic viscosity) [η] = 1.23 × 10 ⁻⁴ M ^0.83 c = 0.7

Various colored heat stabilizers, release agents, antistatic agents, light stabilizers, etc. can be further added to the colored master pellets for optical molded articles of the present invention as long as the objects of the present invention are not impaired. It is.

As the release agent, various release agents used for polycarbonate resins can be used, and higher fatty acid esters are preferred. Examples of such higher fatty acid esters include esters of an aliphatic saturated monovalent carboxylic acid having 10 to 34 carbon atoms and a monohydric or dihydric or higher polyhydric alcohol. Such aliphatic saturated monocarboxylic acids include capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, nonadecanoic acid, alaxic acid, behenic acid, and montanic acid And the like.

Further, a partial ester of an aliphatic saturated monocarboxylic acid having preferably 10 to 24 carbon atoms, more preferably 16 to 22 carbon atoms, and a dihydric or higher polyhydric alcohol can be mentioned. DVDs require molding at an extremely high temperature, but such partial esters can suppress deterioration in the properties of the fluorescent dye during molding at high temperatures. Examples of the dihydric or higher polyhydric alcohol include ethylene glycol, glycerin, and pentaerythritol. Particularly preferred are partial esters of stearic acid and glycerin. These are commercially available, for example, from Riken Vitamin Co., Ltd. under the trade name of Riquemar S-100A, and can be easily obtained from the market. The composition ratio of the release agent is preferably from 0.005 to 0.5 part by weight, more preferably from 0.01 to 0.2 part by weight, based on 100 parts by weight of the component A.

The colored master pellets of the present invention preferably contain a heat stabilizer, particularly preferably a phosphorus-based stabilizer. As the phosphorus-based stabilizer, any of phosphite-based, phosphonite-based, and phosphate-based stabilizers can be used.

Various phosphite-based stabilizers in the present invention can be used. Specifically, for example, general formula (4)

[0050]

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[Wherein R ¹ is hydrogen or C 1-20
An alkyl group, an aryl group or alkaryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 30 carbon atoms, or a halo or alkylthio (the alkyl group has 1 to 3 carbon atoms)
0) or a hydroxy substituent, and the three R ^{1 s} can be selected either identically or differently,
Further, a cyclic structure can be selected by being derived from a dihydric phenol. ] It is a phosphite compound represented by these. Further, as a more preferred embodiment in the general formula (4), the following general formula (5)

[0052]

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[0053] [wherein R ² and R ³ is hydrogen or an alkyl group having 1 to 20 carbon atoms, an aryl group or alkyl aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 30 carbon atoms, R ² And R ³ are not hydrogen at the same time and can be selected either the same or different. And a phosphite compound represented by the following formula: The general formula (6)

[0054]

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[In the formula, R ⁴ and R ⁵ are each hydrogen and have 1 carbon atom.
An alkyl group having 20 to 20 carbon atoms, an aryl group or an alkylaryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 30 carbon atoms, a cycloalkyl group having 4 to 20 carbon atoms,
And represents 25 2- (4-oxyphenyl) propyl-substituted aryl groups. The cycloalkyl group and the aryl group can be selected from those not substituted with an alkyl group and those substituted with an alkyl group. And a phosphite compound represented by the following formula:
Also, the general formula (7)

[0056]

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Wherein R ⁶ and R ⁷ are an alkyl group having 12 to 15 carbon atoms. Note that R ⁶ and R ⁷ may be the same or different from each other. And a phosphite compound represented by the following formula:

Examples of the phosphonite stabilizer include a phosphonite compound represented by the following general formula (8) and a phosphonite compound represented by the following general formula (9).

[0059]

Embedded image

[0060]

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[Wherein, Ar ¹ and Ar ^{2 each} represent an aryl group or an alkylaryl group having 6 to 20 carbon atoms, or
It represents 5 to 25 2- (4-oxyphenyl) propyl-substituted aryl groups, and the four Ar ^{1 s} can be the same or different. Or two Ar ²
Can be the same or different from each other. ]

In the present invention, among the above-mentioned phosphite compounds and phosphonite compounds, more preferred phosphorus-based stabilizers include the phosphite compound represented by the above formula (5) (component E1) and the above-mentioned formula (8). )
(E2 component) and the phosphonite compounds represented by the above general formula (9) (E3 component) can be mentioned, and these can be used alone or in combination of two or more, and more preferably the above general formula (1) At least 5% by weight of 100% by weight of the E component
This is the case.

Preferred specific examples of the phosphite compound corresponding to the general formula (4) include diphenylisooctyl phosphite, 2,2′-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, Examples include diphenyl mono (tridecyl) phosphite, phenyl diisodecyl phosphite, and phenyl di (tridecyl) phosphite. More preferred specific examples corresponding to the above general formula (5) include triphenyl phosphite, tris (dimethylphenyl) phosphite, tris (diethylphenyl) phosphite, tris (di-iso-propylphenyl) phosphite, Tris (di-n-butylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tris (2,6-di-tert-butylphenyl) phosphite and the like. Dialkyl-substituted phenyl) phosphite is preferred, tris (di-tert-butylphenyl) phosphite is more preferred, and tris (2,4-di-tert-butylphenyl) phosphite is particularly preferred. The above phosphite compounds can be used alone or in combination of two or more.

Preferable specific examples of the phosphite compound corresponding to the above general formula (6) include distearylpentaerythritol diphosphite, bis (2,4-
Di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, phenylbisphenol A pentaerythritol diphosphite, dicyclohexylpentaerythritol diphosphite And distearyl pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-ter
(tert-butyl-4-methylphenyl) pentaerythritol diphosphite. Such phosphite compounds can be used alone or in combination of two or more.

Preferred specific examples of the phosphite compound corresponding to the above general formula (7) include 4,4'-isopropylidenediphenol ditridecyl phosphite.

Preferred specific examples of the phosphonite compound corresponding to the above general formula (8) include tetrakis (2,4-di-iso-propylphenyl) -4,4 ′
-Biphenylenediphosphonite, tetrakis (2,4-
Di-n-butylphenyl) -4,4'-biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -4,4'-biphenylenediphosphonite, tetrakis (2,4-di- tert-butylphenyl) -4,3′-biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -3,
3'-biphenylenediphosphonite, tetrakis (2,
6-di-iso-propylphenyl) -4,4'-biphenylenediphosphonite, tetrakis (2,6-di-n
-Butylphenyl) -4,4'-biphenylenediphosphonite, tetrakis (2,6-di-tert-butylphenyl) -4,4'-biphenylenediphosphonite, tetrakis (2,6-di-tert-butyl) Phenyl)-
4,3′-biphenylenediphosphonite, tetrakis (2,6-di-tert-butylphenyl) -3,3 ′
-Biphenylenediphosphonite; tetrakis (di-tert-butylphenyl) -biphenylenediphosphonite is preferred; tetrakis (2,4-di-t
(tert-butylphenyl) -biphenylenediphosphonite is more preferred. This tetrakis (2,4-di-te
(rt-butylphenyl) -biphenylenediphosphonite is preferably a mixture of two or more, specifically, tetrakis (2,4-di-tert-butylphenyl) -4,
4'-biphenylenediphosphonite (E2-1 component),
Tetrakis (2,4-di-tert-butylphenyl)
One kind of -4,3'-biphenylenediphosphonite (E2-2 component) and tetrakis (2,4-di-tert-butylphenyl) -3,3'-biphenylenediphosphonite (E2-3 component) Alternatively, two or more of them can be used in combination, but a mixture of these three is preferred. In the case of three kinds of mixtures, the mixing ratio is E2-1.
Component, E2-2 component and E2-3 component in a weight ratio of 10
The range of 0:37 to 64: 4 to 14 is preferable, and 100:
The range of 40-60: 5-11 is more preferable.

Preferred specific examples of the phosphonite compound corresponding to the above general formula (9) include bis (2,4-di-
iso-propylphenyl) -4-phenyl-phenylphosphonite, bis (2,4-di-n-butylphenyl) -3-phenyl-phenylphosphonite, bis (2,4-di-tert-butylphenyl)- 4-phenyl-phenylphosphonite, bis (2,4-di-te
rt-butylphenyl) -3-phenyl-phenylphosphonite bis (2,6-di-iso-propylphenyl) -4-phenyl-phenylphosphonite, bis (2,6-di-n-butylphenyl) -3 -Phenyl-
Phenylphosphonite, bis (2,6-di-tert-
Butylphenyl) -4-phenyl-phenylphosphonite, bis (2,6-di-tert-butylphenyl)-
3-phenyl-phenylphosphonite and the like, and bis (di-tert-butylphenyl) -phenyl-phenylphosphonite is preferable, and bis (2,4-di-te
(rt-butylphenyl) -phenyl-phenylphosphonite is more preferred. This screw (2,4-di-tert)
-Butylphenyl) -phenyl-phenylphosphonite is preferably a mixture of two or more, specifically, bis (2,4-di-tert-butylphenyl) -4-phenyl-phenylphosphonite (E3-1 component). )and,
Bis (2,4-di-tert-butylphenyl) -3-
One or two of phenyl-phenylphosphonite can be used in combination, but a mixture of these two is preferred. In the case of two types of mixtures, the mixing ratio is
The weight ratio is preferably in the range of 5: 1 to 4, more preferably 5: 2 to 3.

On the other hand, examples of the phosphate stabilizers include tributyl phosphate, trimethyl phosphate, tricresyl phosphate, triphenyl phosphate, trichlorophenyl phosphate, triethyl phosphate, diphenylcresyl phosphate, diphenyl monoorthoxenyl phosphate, tribubutoxyethyl phosphate, and the like. Examples thereof include dibutyl phosphate, dioctyl phosphate, and diisopropyl phosphate, and preferred is trimethyl phosphate.

The heat stabilizer is preferably contained in an amount of 0.0001 to 0.1 part by weight, more preferably 0.0005 to 0.05 part by weight, per 100 parts by weight of the component A.
More preferably, it is 0.001 to 0.03 parts by weight.

In the present invention, the “foreign matter” refers to a contaminant mixed through various routes in all processes from production of an aromatic polycarbonate resin from a raw material to molding of an optical disk substrate. , Solvents, stabilizers, additives such as release agents, coloring agents, etc.)
And all components insoluble in methylene chloride, such as impurities and dust contained in, and dust adhering to manufacturing equipment or carbide generated during the molding process.

The colored master pellet for an optical molded article of the present invention contains one or less foreign matter having a particle size of 200 μm or more per kg of resin. Preferably, 300 or less foreign substances having a particle size of 100 μm or more per 1 kg of resin, more preferably 500 foreign substances having a particle size of 50 μm or more per 1 kg of resin are used.
Not more than In addition, regarding the amount of minute foreign matter, the particle diameter is not more than 0.3.
The number of foreign matters having a size of 5 μm or more is preferably 10,000 / g or less.

In order to obtain the polycarbonate resin having a small amount of foreign matter according to the present invention, a raw material having a small amount of impurities purified by sublimation, recrystallization or the like (additives such as monomers, solvents, stabilizers, release agents, colorants, etc.) is used. Or by a conventional method (solution polymerization method, melt polymerization method, etc.) as described above, followed by filtration in a solution state, or granulation (desolvation) of the granular material under heating conditions, for example. It is washed with a poor solvent such as acetone to remove impurities and foreign substances such as low molecular weight components and unreacted components, etc. In addition, in the extrusion process (pelleting process) for obtaining pellet-shaped polycarbonate resin for injection molding, it is in a molten state At the time of the removal, foreign substances are removed by passing through a sintered metal filter having a filtration accuracy of 10 μm, etc. If necessary, an additive such as an antioxidant such as a phosphorus-based substance may be added to prevent the generation of foreign substances. Can stop. Material resin before injection molding In any case it is necessary to keep foreign objects, impurities, the content of such solvent as low as possible.

When an optical disk substrate is manufactured from the above polycarbonate resin, an injection molding machine (including an injection compression molding machine) is used. As this injection molding machine, a commonly used one may be used, but from the viewpoint of suppressing the generation of carbides and increasing the reliability of the disk substrate, the adhesion to the resin as a cylinder or a screw is low, and the corrosion resistance and abrasion resistance are low. It is preferable to use a material made of a material having properties.
Injection molding conditions are cylinder temperature 300-400.
C. and a mold temperature of 50 to 140 ° C. are preferred, whereby an optically excellent optical disc substrate can be obtained. The environment in the molding step is preferably as clean as possible from the viewpoint of the present invention. It is also important to sufficiently dry the material to be subjected to molding to remove moisture, and to take care not to cause stagnation that may cause decomposition of the molten resin.

In the present invention, the amount of fine powder of the colored master pellet is measured by the following method. After weighing 5 kg of the colored master pellet, the pellet is passed through a circular vibrating sieving machine (TM-70-2S, manufactured by Tokushou Kosakusho).
Separate 0 and 0.5 mm or less fine powder.

The content of the fine powder of 1.0 mm or less is 250 ppm or less in the present invention. Within this range, there is little color unevenness and color streaks when molding optical molded products such as optical disk substrates, and no polarization defects (white defects) occur even in a high temperature and high humidity environment. And a highly reliable optical molded product can be obtained. Preferably not more than 200 ppm, more preferably 100 pp
m or less. In the colored master pellets of the present invention, the effect of the fine powder is greater because it contains a coloring agent,
The content of the fine powder of 0.5 mm or less is preferably 200 ppm or less, more preferably 100 ppm or less, and most preferably 50 ppm or less.

In order to produce the colored master pellet having a small content of fine powder of the present invention, the cutting conditions of the strands are adjusted to minimize the amount of fine powder generated. For example, when a resin is extruded by an extruder into a strand and cut with a cutter to obtain a pellet, it is desired that the pellet has a circular cross section and a small number of irregularities. In order to reduce the unevenness of the cross-sectional shape, it is desirable that the strand is cooled at a temperature as uniform as possible around the strand. In this case, the temperature of the strand at the time of cutting the cutter is preferably 110 to 140 ° C, more preferably. 12
It is desirable to cool to 0 to 130 ° C. Thus, the twist of the strand can be reduced, and the unevenness on the surface can be reduced.

Further, the fine powder once generated is separated and removed by using a sieve, or the fine powder adhering to the pellet is separated by flowing counter-current ionized air against the pellet falling in the rectangular conduit. Remove.

The shape of the colored master pellet in the present invention may be any shape as long as it is used as a colored master pellet for molding, particularly a colored master pellet for an optical molding material, and the size and shape are not particularly limited. Generally, the inner diameter is 2.0 to 3.3 mm and the length is 2.5 to 3.
5 mm is suitable. In addition, the shapes of the colored master pellet and the transparent pellet are preferably substantially the same. In order to prevent the colored master pellet from being classified in the blended pellet of the colored master pellet and the transparent pellet, the average weight ratio per pellet is 0.96. ~ 1.1 is preferred.

[0079]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples. Further, “parts” in the examples means parts by weight unless otherwise specified. The evaluation items and methods common to the optical discs are as follows. (1) Measurement of foreign matter content Foreign matter having a size of 200 μm or more was dissolved in methylene chloride previously filtered through a 0.05 μm filter, and filtered through a 200 μm filter.
The number of remnants on the filter was counted and measured. The number was converted and expressed per kg of resin.

Further, foreign substances having a size of 0.5 μm or more were measured by passing the above solution through a liquid fine particle counter (HIAC, manufactured by ROYCO) using a light scattering / light blocking method using laser light. (2) Long-term reliability test Disk molding machine [DISK manufactured by Sumitomo Heavy Industries, Ltd.
3M III], the optical disc substrate (diameter 120 mm, thickness 1.2 mm) was left in a thermo-hygrostat controlled at a temperature of 80 ° C. and a relative humidity of 85% for 1000 hours, and the size of the substrate was 20 μm. The number of the above white defects (polarization defects) was counted. This was performed for 25 optical disk substrates, and the average value was determined, and this was defined as the number of white spots. (3) Measurement of color unevenness Using the blended pellets shown in Table 2, an injection molding machine [Sumitomo Heavy Industries S480 / 150] has a cylinder temperature of 350.
100 ° C. and a mold temperature of 120 ° C., 100 sheets of color unevenness evaluation molded plates having a length of 50 mm × a width of 90 mm × a thickness of 0.6 mm were continuously formed.

The 100 molded plates were placed on a spectrophotometer (da
L * (brightness), a * under a D65 light source (correlated color temperature: 6504 K) using Tacolor SF500).
(The chromaticity from reddish to greenish) and b * (the chromaticity from yellowish to bluish) are measured, and the values obtained from the maximum and minimum values are inserted into the equation (i). The color difference (△ E *)
And evaluated on a three-point scale. The closer the value of ΔE * (color difference) is to 0, the more stable the hue. △: ΔE * ≦ 0.5 Δ: 0.5 <ΔE * <1.0 ×: ΔE * ≧ 1.0

[0082]

(Equation 1)

(4) Measurement of color streaks Evaluation of color unevenness First shot of molding from 100 molded plates
The appearance of the ten sheets up to the tenth shot was visually observed and evaluated on a three-point scale. ：: no color streaks Δ: one color streak ×: two or more color streaks (5) Observation of optical disk appearance The optical disk obtained above was visually observed. Was. (6) Light transmittance characteristics The test piece for measuring light transmittance was obtained by pelletizing the obtained pellet with an injection molding machine [Sumitomo Heavy Industries S480 / 150] at a cylinder temperature of 350 ° C, a mold temperature of 120 ° C, and a length of 50 mm x a width of 9 mm.
A molded plate for transmittance evaluation of 0 mm × 0.6 mm in thickness was prepared.

The molded plate was measured for light transmission characteristics using a self-recording spectrophotometer Model U-3200 manufactured by Hitachi, Ltd., and the maximum light transmittance at each wavelength of 350 nm to 400 nm and the minimum light transmittance at 400 nm to 650 nm were measured. The transmittance and the light transmittance at 650 nm were determined.
(7) Substrate lamination test An ultraviolet-curable adhesive was spin-coated and cured by irradiation with ultraviolet rays to obtain a DVD disk on which two data substrates were laminated. Next, the adhesiveness was evaluated by the following method. ：: Cannot be peeled off by hand and has sufficient adhesive strength ×: Peelable by hand

[Examples A to S, 1 to 26 and Comparative Examples A, B, 1 to 3] <Production of Colorant Master Composition and Additive Master Composition> First, the colorant components and additives shown in Table 1 The components were diluted with the thermoplastic resin composition of the component A so as to have a ratio of 10% by weight, and were uniformly mixed with a Henschel mixer to obtain a colorant master composition and an additive master composition. Table 1 shows the colorant master composition and the additive master composition.
Blend to achieve the described composition.

[0086]

[Table 1]

<Production of Colorant Master Pellets and Transparent Pellets> These master compositions were mixed with the remaining components so as to have the composition ratios shown in Table 1, and then uniformly mixed with a tumbler. Thereafter, the mixture was melt-kneaded at a cylinder temperature of 280 ° C. while evacuating from the vent with a twin-screw extruder with a vent of 30 mmφ [Kobe Steel Ltd. KTX-30], and extruded into pellets (pellet shape: 2.7 mm diameter × Length 3.0 mm). A filter was installed in the die part of the extruder so that the number of foreign substances having a size of 5 μm or more was 20 or less per gram. In addition, all of the above-mentioned devices are circulating 101.8 kPa (1.
(005 atm), and ion-exchanged water was used as cooling water.

The colorant master pellets A to R were prepared by cooling the strands by passing the strands over a corrugated sheet through which cooling water was flown (corrugated sheet cooling method). The temperature was 132 ° C. While the pellets were dropped into a rectangular conduit, ionized air was allowed to flow countercurrently to separate and remove fine powder adhering to the pellets. On the other hand, the coloring agent master pellet X contains the coloring agent component, the additive component, and the thermoplastic resin of the A component shown in Table 1 in Table 1.
Was directly mixed only with a tumbler so that the composition ratio was as follows.
Then, a twin-screw extruder with a vent of 30 mm in diameter [Ltd.
At Kobe Steel KTX-30], the mixture was melt-kneaded at a cylinder temperature of 280 ° C. while evacuating from a vent, and extruded into pellets. At this time, no filter was installed in the die portion of the extruder. As a cooling method, a method of passing the strand through a water bath at 27 ° C. for 5 seconds to cool the strand is used.
The pellet temperature immediately after cutting with a cutter is 83 ° C,
No fine powder removal by ionized air was performed. In addition, tap water was used as the water for cooling the above equipment.

Further, a transparent pellet containing no colorant component for dilution (pellet shape: 2.7 mm in diameter × 3.
0 mm) was produced under the same conditions as for the colorant master pellets A to R above.

[0090]

[Table 2]

<Manufacture of CD Disk> Using a colored master pellet and a transparent pellet shown in Table 2, a mold dedicated to CD was attached to an injection molding machine, DISK3 MIII manufactured by Sumitomo Heavy Industries, Ltd., and a pit was formed in this mold. Nickel C
A stamper for D was mounted, and the molding material was put into the hopper of the molding machine by automatic conveyance.
Under the condition of 920 kPa, the diameter is 120 mm and the wall thickness is 1.2 mm.
Was molded, and a CD disk was obtained using this substrate. Table 3 shows the evaluation results of these CD disks.

[0092]

[Table 3]

In each of the examples, the number of foreign substances having a particle diameter of 100 μm or more was 300 or less per kg of resin, and the number of foreign substances having a particle diameter of 50 μm or more was 500 or less per kg of resin.

<Manufacture of CD-R Disk> A disk substrate was formed using the colored master pellets and the transparent pellets shown in Table 2, and a dye-based recording layer was formed thereon to prepare a CD-R disk. Table 4 shows the evaluation results of these CD-R discs.

[0095]

[Table 4]

Further, the recording surface of the CD-R disk was exposed to sunlight through the glass, and a weather resistance test was conducted to determine the number of days during which writing and reading abnormalities occurred. Had the weather resistance.

<Manufacture of DVD Disc> Using a colored master pellet and a transparent pellet shown in Table 2, a mold dedicated to DVD was attached to an injection molding machine, DISK3 MIII manufactured by Sumitomo Heavy Industries, Ltd., and an address signal was applied to this mold. Attach a nickel DVD stamper containing information such as
The molding material is put into the hopper of the molding machine by automatic conveyance, the cylinder temperature is 380 ° C, the mold temperature is 115 ° C, and the injection speed is 3
A DVD substrate having a diameter of 120 mm and a thickness of 0.6 mm was formed under the conditions of 00 mm / sec and a holding pressure of 3920 kPa,
A DVD disk was obtained using this substrate. These DVs
Table 5 shows the evaluation results of the D disk.

[0098]

[Table 5]

The symbols and items indicating the components shown in Table 1 are as follows. (A component) PC-1 The amount of foreign matter is 0.1 / Kg and the viscosity average molecular weight is 15,20.
Bisphenol A polycarbonate resin powder obtained by a phosgene method without using an amine catalyst of 0 (p-tert-butylphenol is used as a terminal stopper) PC-2 The amount of foreign substances is 0.1 / Kg and the viscosity average molecular weight is 14, 80
1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane [bisphenol TMC] was 45 mol% of the total aromatic dihydroxy components obtained by the phosgene method using an amine catalyst of 0. , 4,
Aromatic polycarbonate copolymer powder containing 4 '-(m-phenylenediisopropylidene) diphenol [bisphenol M] in an amount of 55 mol% (p as a terminal stopper)
-Tert-butylphenol) PC-3 When the amount of foreign matters is 0.1 / Kg and the terminal hydroxyl group concentration is 34 mol%,
Bisphenol A polycarbonate resin pellets obtained by a melt transesterification method using 2 × 10 ^-7 mol of bisphenol A disodium salt per mol of raw material bisphenol A as a transesterification catalyst having a viscosity average molecular weight of 15,300 PC- 4 The amount of foreign substances is 1.0 particles / Kg and the viscosity average molecular weight is 15,20.
Bisphenol A polycarbonate resin powder obtained by a phosgene method without using an amine catalyst (p-tert-butylphenol as a terminal stopper)

(Component B) Red dye-1: Perinone-based red dye, manufactured by Arimoto Chemical Co., Ltd.
last Red 8370 Red dye-2: Perylene fluorescent red dye, BASF L
umogen F Red 305 Red Dye-3: Coumarin fluorescent red dye, Bayer M
Arolex Fluorescent Red G red dye-4: thioindigo fluorescent red dye, Arimoto Chemical Co., Ltd. Plast Red D54 red dye-5: perinone red dye, Kiwa Chemical Co., Ltd. K
p Plast RedHG Red dye-6: Perinone-based red dye, manufactured by Kiwa Chemical Co., Ltd.
p Plast RedH2G Yellow dye-1: Quinoline-based yellow dye, manufactured by Arimoto Chemical Co., Ltd.
last Yellow8010 Yellow dye-2: Coumarin-based fluorescent yellow dye, manufactured by Bayer M
acrolex Fluorescent Yellow
w 10GN yellow dye-3: quinoline yellow dye, manufactured by Arimoto Chemical Co., Ltd.
last Yellow8050 Green dye: Anthraquinone-based green dye, manufactured by Arimoto Chemical Co., Ltd.
Oil Green 5602 blue dye: Anthraquinone blue dye, Ma manufactured by Bayer AG
crolex Blue RR

(Additive component) ST: tris (2,4-di-tert-butylphenyl phosphite), Irgaf manufactured by Ciba-Geigy Japan
os168 L1: Glycerin monostearate, Riken V-100 manufactured by Riken Vitamin Co., Ltd.

[0102]

The present invention has excellent design properties, and its type and use can be determined instantaneously. In addition, there is little discoloration phenomenon, color unevenness, color streaks, etc. when molding an optical disc substrate, and it can be used in a high temperature and high humidity environment. Even if there is no polarization defect (white defect), the error is small, and it is an extremely reliable colored master pellet for optical molded products. The industrial effect of the present invention is outstanding.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/00 C08K 5/00 C08L 69/00 C08L 69/00 G11B 7/24 526 G11B 7/24 526P 526R // B29K 69:00 B29K 69:00 (72) Inventor Shimizu Hisaga F-term in Teijin Chemicals Co., Ltd. 1-2-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo 4F070 AA50 AB22 AC31 AE04 FA03 FA15 FB03 FC06 4F071 AA50 AA81 AC02 AC07 AC12 AC13 AC19 AE09 AF29 AF34 AH14 BA01 BB05 BC03 4F201 AA28A AB06 AB12 AH38 AH79 AR12 AR13 BA02 BC02 BC19 BD04 BL42 BL43 4J002 AA011 CG001 CG011 CG021 CG031 EA066 EE056 FD056 EL096 EU0956 EU0956

Claims (6)

[Claims] 1. A colored master pellet comprising a thermoplastic resin (A component) and a coloring agent (B component), wherein the pellet is used to remove foreign substances having a particle size of 200 μm or more by 1 kg of the resin.
Color master pellets for optical molded articles, characterized in that they contain not more than one per unit. 2. The pellet has an average length of 2.
0 to 3.3 mm, average value of major axis of cross section ellipse is 2.5 to
The colored master pellet for an optical molded product according to claim 1, which has a range of 3.5 mm. 3. A component having a viscosity average molecular weight of 10,000.
The colored master pellet for an optical molded product according to claim 1, which is an aromatic polycarbonate resin of 0 to 22,000. 4. The colored master pellet for an optical molded product according to claim 1, wherein the component A is 90 to 99.995% by weight and the component B is 0.005 to 10% by weight. 5. The optical molded product according to claim 1, wherein the component B is an anthraquinone dye, a perinone dye, a quinoline dye, a perylene dye, a coumarin dye, or a thioindigo dye. For coloring master pellet. 6. An optical disk substrate formed using the colored master pellet for an optical molded product according to claim 1. Description: