JP2002322290A - Colored master pellet for optical molded product and colored optical disk substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide colored master pellets extremely small in the variation of colorant density among the individual pellets, therefore suitable for giving optical molded products such as optical disks with little occurrence of color unevenness and color striae and good electrical properties. SOLUTION: The colored master pellets for optical molded products are obtained from a colored composition comprising a transparent thermoplastic resin (A-component) containing a colorant (B-component). The colored master pellets thus obtained include >=90%, on a number basis, of the pellets whose colorant density is 0.5X to 1.5X (wherein, X is the average of absorbance as the indicator of colorant density in the individual pellets).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored master pellet for obtaining a colored optical molded product. More specifically, the present invention relates to a colored master pellet for obtaining a colored optical molded product which is excellent in design property and whose type and use can be judged instantaneously. In other words, the present invention relates to a colored master pellet capable of obtaining a colored optical molded product having less fading phenomenon, color unevenness and color streak, and further having excellent electric characteristics (for example, information writing and reading characteristics).

[0002] In the present specification, a "colored master pellet" is a pellet containing a colorant, which is mixed with a transparent (no colorant-containing) pellet and melt-molded to obtain a colored optical molded product. Means pellets.
Therefore, the colored master pellet is not used for the purpose of obtaining a colored optical molded product by melt-molding itself.
The “colored master composition” is a resin composition containing a colorant, and refers to a resin composition used for forming a colored master pellet. Further, the “full-attached pellet” refers to a pellet containing a coloring agent, which is used to obtain a colored optical molded product by melt-molding itself (melting without mixing with a transparent pellet). .

[0003]

2. Description of the Related Art Conventionally, as a method for coloring an optical recording medium, Japanese Patent Application Laid-Open No. Hei 1-102505 using fully-adhered pellets 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. Japanese Patent Application Laid-Open No. Hei 7-262606 proposes a colored optical disk using an extremely low-density colored master pellet. Here, “extremely low concentration” means a concentration at which the content of the colorant is extremely small. On the other hand, 6-188
No. 90 discloses a method of controlling the amount of fine powder in a pellet to suppress the generation of silver during optical disk production. Japanese Patent Application Laid-Open No. 11-342510 describes that an optical disk using a pellet having a small content of fine powder has good electric characteristics.

[0004] However, in the case of colored master pellets having a relatively high coloring concentration for obtaining molded articles for optical use, the classification of the colored pellets and the influence of fine powder are greater than those of transparent pellets, all-coated pellets and extremely low-density colored master pellets. When a molded article for optical use such as an optical disc is molded by mixing with a transparent pellet, a new problem occurs such as fading, generation of color unevenness and color streak, and deterioration of electric characteristics.
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 were not sufficient to solve the above-mentioned problems caused by the formation of the colored master pellets.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a discoloration phenomenon when molding an optical molded article such as a colored optical disk substrate which is excellent in design and whose type and application can be instantaneously determined.
The present invention relates to a colored master pellet capable of obtaining a colored optical molded article having less color unevenness, color stripes, and the like and having good electric characteristics. In particular, it is an object of the present invention to provide a colored master pellet suitable for obtaining an optical disk that optically reads an information signal by using a laser beam. The present inventors have conducted intensive research to achieve such an object,
The present inventors have found that a colored master pellet satisfying specific requirements can achieve the object of the present invention, and have completed the present invention.

That is, according to the study of the present inventors, when a colored master pellet is mixed with a transparent pellet and melt-molded to produce an optical molded product, the cause of the occurrence of color unevenness and color streaks and the writing of information signals. And the cause of the decrease in reading reliability were analyzed. As a result, the unevenness of the colorant in the individual pellets in the colored master pellets is one cause, and the unevenness in the concentration of the colorant in the individual pellets is set to a certain level or less. It has been found that a colored optical molded product can be obtained in which the generation of streaks can be extremely suppressed and the reliability of writing and reading of information signals is highly maintained.

Further, according to the study of the present inventors, a colored master pellet in which the variation in the concentration of the coloring agent between individual pellets is reduced to a certain level or less is obtained. It has been found that a colored master pellet satisfying any of them has extremely excellent properties for obtaining a colored optical molded product, particularly a colored optical disk substrate. (1) The particle size is 2.0 m larger than the desired shape of the pellet.
The content of the powder having a small shape of not more than m, especially not more than 1.0 mm is not more than a certain ratio. (2) The number of foreign substances contained in the pellets is small.

[0008]

The present invention has been achieved based on the above findings. According to the present invention, a transparent thermoplastic resin (A component) containing a colorant (B component) is used. A colored master pellet formed from a colored composition, wherein the concentration of the coloring agent in each pellet is represented by absorbance, and when the average value is X, 0.5X to
A colored master pellet is provided for optical moldings, wherein the proportion of the number of pellets having a colorant concentration satisfying the range of 1.5X is at least 90%.

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, and phase change disks 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 and suitable for manufacturing digital versatile discs, which are high-density optical discs. CD-R and DVD
Most suitable for -R.

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 cited 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, ZEONOR 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 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 herein 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 in combination of two or more.

Among them, 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 particularly, 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 or haloformate is used, and specific examples include phosgene, diphenyl carbonate and dihaloformate of dihydric phenol. In producing the polycarbonate resin by reacting the dihydric phenol and the carbonate precursor by the interfacial polycondensation method or the melt transesterification method, if necessary, a catalyst, a terminal stopper, an antioxidant for the dihydric phenol, etc. 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
It can be calculated by 1 H-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. Examples of the acid binder include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide and amine compounds such as pyridine.
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).

[0019]

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Wherein A is a hydrogen atom or a group having 1 to 9 carbon atoms.
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, for example, 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 alkyl carboxylic 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.

[0022]

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(Wherein X is -R-CO-O- or -R
-O-CO-, wherein R is a single bond or 1 carbon atom
Represents a divalent aliphatic hydrocarbon group of 10 to 10, preferably 1 to 5, and n represents an integer of 10 to 50. In the substituted phenols of the general formula (2), n is 1
Those having 0 to 30, especially 10 to 26 are preferred, and specific examples thereof include, for example, decylphenol, dodecylphenol, tetradecylphenol, hexadecylphenol, octadecylphenol, eicosylphenol,
Docosyl phenol and triacontyl phenol can be exemplified.

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 to 30, especially 10 to 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.

The terminal terminator is desirably introduced at least 5 mol%, preferably at least 10 mol%, based on all terminals of the obtained polycarbonate resin. More preferably, 80 mol% or more of a terminal terminator is introduced 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 the terminal terminator is introduced in an amount of 90 mol% or more with respect 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 and the carbonate ester while heating in the presence of an inert gas. It is carried out 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 to 1
The distillation of alcohol or phenol generated by reducing the pressure to about 3.3 Pa is facilitated. 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 the polymerization catalyst used is preferably 1 × 10 ⁻⁸ to 1 ×, based on 1 mol of the dihydric phenol used as the raw material.
It is selected in the range of 10 ⁻³ equivalents, more preferably 1 × 10 ^{−7 to} 5 × 10 ⁻⁴ equivalents.

In order to reduce the number of phenolic terminal groups in such a polymerization reaction, 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 a compound 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 the polymerization reaction. Specific examples of the deactivator include, for example, benzenesulfonic acid, p-toluenesulfonic acid, methylbenzenebenzenesulfonate, ethylbenzenebenzenesulfonate, butylbenzenesulfonate, octylbenzenesulfonate, phenylbenzenesulfonate, and p-toluenesulfone. 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 13.5
00 to 16,500 are 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 methylene chloride 10
The specific viscosity (η _SP ) obtained from a solution obtained by dissolving 0.7 g of a polycarbonate resin in 0 ml at 20 ° C. is determined by inserting the specific viscosity (η _SP ) 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

The component A of the present invention preferably contains 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, the general formula (4)

[0035]

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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)

[0037]

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[0038] [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)

[0039]

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[In the formula, R ⁴ and R ⁵ are each hydrogen and carbon number 1
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. As the cycloalkyl group and the aryl group, any of those not substituted with an alkyl group and those substituted with an alkyl group can be selected. And a phosphite compound represented by the following formula:

The general formula (7)

[0042]

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Wherein R ⁶ and R ⁷ are alkyl groups having 12 to 15 carbon atoms. Note that R ⁶ and R ⁷ can be selected either identically or differently. 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).

[0044]

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[In the formula, 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 as each other 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 (5) At least 5% by weight of the phosphite compound represented by
This is the case.

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

Preferred specific examples of the phosphonite compound corresponding to the 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 and the like, and tetrakis (di-tert-butylphenyl) -biphenylenediphosphonite is preferable, and 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 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, preferably bis (di-tert-butylphenyl) -phenyl-phenylphosphonite, 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-
1 of phenyl-phenylphosphonite (E3-2 component)
Species or a combination of two species can be used, but a mixture of the two species is preferred. In the case of two kinds of mixtures, the mixing ratio is preferably in the range of 5: 1 to 4 by weight, more preferably in the range of 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 used in an amount of 0.0001 per 100 parts by weight of the component A.
It is preferably contained in an amount of 0.1 to 0.1 part by weight, more preferably 0.0005 to 0.05 part by weight, and still more preferably 0.001 to 0.03 part by weight.

Further, the coloring composition of the present invention can contain a release agent. Particularly when the component A is a polycarbonate resin, it is preferable to use a higher fatty acid ester as the release agent. 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, preferably, it has 10 to 24 carbon atoms,
More preferably, a partial ester of an aliphatic saturated monovalent carboxylic acid having 16 to 22 carbon atoms and a dihydric or higher polyhydric alcohol can be exemplified. For DVDs, molding at an extremely high temperature is required, but such a partial ester can suppress the deterioration of the properties of the fluorescent dye, especially during molding at a high temperature. Examples of the dihydric or higher polyhydric alcohol include ethylene glycol, glycerin, pentaerythritol and the like. 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 0.005 to 0.5 part by weight, based on 100 parts by weight of the component A.
More preferably, it is 0.01 to 0.2 parts by weight.

The coloring agents used as the component B in the present invention include 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 preferably, an anthraquinone dye, a perinone dye, a quinoline dye, a perylene dye, a coumarin dye, and a thioindigo dye can be mentioned.

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 Blue 9
7, CI Solvent Violet 13, CI
SolventViolet 14, CI Solv
ent Green 3, CI Solvent Gr
anthraquinone dye known as een28, C
I Vat Orange 9, CI Vat Orange
ge2, pyranthrone anthraquinone dyes known as CI Vat Orange 4, isodibenzanthrone anthraquinone dyes, CI Vat O
and dibenzpyrenequinones, known as CI range 1 and CI Vat Yellow 4, and anthraquinone dyes. As thioindigo dyes, CI VatRed 2, CI Vat Red
41, CI Vat Red 47 and the like. As perylene dyes, CI Vat Re
d 15, CI Vat Orange 7, and B
F Ora as LUMOGEN series manufactured by ASF
nge240, F Red305, F Yellow0
83, F Red 339 and the like. Coumarin-based dyes include MACROLEX manufactured by Bayer AG
Fluorescent Yellow 10GN (C
I Solvent Yellow 160: 1), MA
CROLEX Fluorescent Red G,
As quinoline dyes, CI Solvent Ye
llow 33, CI Solvent Yellow
157, CI Solvent Yellow 54,
CI Disperse Yellow 160 and the like. Perinone dyes include CI
Solvent Red 135, CI Solven
t Red 179, CI Solvent Orange
ge 60, CI Pi as a phthalocyanine dye
gment Blue 15: 3, CI Pigmen
t Green 7, CI Pigment Green
n36 and the like. These can be used alone or in combination of two or more, and can be colored according to the purpose.

With respect to the above-mentioned colorants (dyes), the following are specific examples of the color classified into yellow, blue, red and green.

(1) Yellow Dye Specific examples of the yellow dye include CI Solvent.
Yellow 33, CI Solvent Yellow
ow 157, CI Solvent Yellow
98, CI Disperse Yellow 54,
A quinoline dye known as CI Disperse Yellow 160. CI Solvent Gr
perylene dye known as een3. CI Va
dibenzpyrenequinones known as t Yellow 4 and anthraquinone dyes. Solvent Yel
Coumarin dye known as low 160: 1. In addition, BASF's LUMOGEN series F Yell
and perylene dyes known as ow083.

As a preferred specific example, CI Solv
ent Yellow 33, CISolvent Y
yellow 157, CI Solvent Yellow
ow 98, CI Disperse Yellow
54, CI Disperse Yellow 16
0, CI Solvent Green 5, CIVA
t Yellow 4, CI Solvent Yellow
low 160: 1 and F Yellow083 of the LUMOGEN series manufactured by BASF.

(2) Blue dye A specific example of the blue dye is CI Solvent B.
lue 87, CI Solvent Blue 94,
CI Solvent Blue 97, CISolv
ent Violet 13, CI Solvent
An anthraquinone dye known as Violet 14. Furthermore, CI Pigment Blue 15, C
I Pigment Blue 15-1, CI Pi
gment Blue 15: 3. Also, CI Dis
Perse Violet 28 can also be exemplified.

A preferred embodiment is CI Solvent.
Blue 87, CI Solvent Blue
94, CI Solvent Blue 97, CI
Solvent Violet 13, CI Solv
ent Violet 14 and CI Disper
selected from the group consisting of se Violet 28.

(3) Red Dye CI Solvent R is a specific example of a red dye.
ed 22, CI Solvent Red 52, C
I Solvent Red 149, CISolve
nt Red 150, CI Solvent Red
151, CI Solvent Red 168, C
I Solvent Red 191, CI Solve
anthraquinone dye known as ent Red 207. CI Vat Orange 9, CI Va
t Orange 2, CIVat Orange 4
Pyranthrones anthraquinone dyes known as
Isodibenzanthrone anthraquinone dyes, CI
Dibenzpyrenequinones anthraquinone dyes known as Vat Orange 1. CI Solvent
Red 135, CI Solvent Red 1
79, a perinone dye known as CI Solvent Orange 60. CI Vat Red 2,
CI Vat Red 41, CI Vat Red
Thioindigo dye known as 47. MACROL
A coumarin-based dye known as EX Fluorescent Red G. CI Vat Red 15, C
I Vat Orange 7 and L manufactured by BASF
F Orange 240, F of UMOGEN series
Perylene dyes known as Red 305 and F Red 339 can be mentioned.

A preferred embodiment is CI Solvent.
Red 22, CI Solvent Red 5
2, CI Solvent Red 149, CI S
solvent Red 150, CI Solvent
Red 151, CI Solvent Red 1
68, CI Solvent Red 191, CIS
solvent Red 207, CI Solvent
Red 135, CI Solvent Red 1
79, CI Vat Red 2, CI Vat Re
d 41, CI Vat Red 47, CI Sol
vent Orange 55, CI Solvent
Orange 60, CI Solvent Ora
neg 63, CI Vat Orange 1, CI
VatOrange 2, CI Vat Orange
e 4, CI Vat Orange 9, MACROLEX Fluorescent Re, manufactured by Bayer AG
d G, F of LUMOGEN series manufactured by BASF
Red 305, F Red 339 and F Ora
n240.

(4) Green Dye Specific examples of the green dye include CI Solvent.
Green 3, CISolvent Green 2
0, an anthraquinone dye known as CI Solvent Green 28. CI Pigment
Green7, CI Pigment Green 3
And a phthalocyanine dye known as No. 6.

A preferred embodiment is CI Solvent.
Green 3, CI Solvent Green
20 and CI Solvent Green 28
Selected from the group consisting of:

In order to obtain black colored pellets in the master pellets of the present invention, a combination of a green dye and a red dye or a combination of a blue dye and a yellow dye may be used among the above dyes. That is, in order to obtain a black master pellet, a preferred specific example is
(I) CI Solvent Green 3, CI
Solvent Green 20 and CI Sol
green dye selected from the group consisting of vent Green 28 and (ii) CI Solvent Red.
22, CI Solvent Red 52, CI S
solvent Red 151, CI Solvent
Red 168, CI Solvent Red 1
91, CI Solvent Red 207, CI
Solvent Red 135, CI Solven
t Red 179, CI Solvent Orange
e60 is a combination of red dyes selected from the group consisting of:

Other preferred embodiments for obtaining black master pellets include (i) CISolvent Blu
e 87, CI Solvent Blue 94, C
I Solvent Blue 97, CI Solve
ent Violet13, CI Solvent V
iolet 14 and CI Disperse Vi
a blue dye selected from the group consisting of olet 28 and (ii) CI Solvent Yellow 33;
CI Solvent Yellow 157, CI
Solvent Yellow 98, CI Disp
erse Yellow 54, CI Dispers
e is a combination of yellow dyes selected from the group consisting of Yellow 160.

The colorant preferably has a small particle size in order to achieve sufficiently uniform dispersion, and more preferably 50 μm
It has the following particle size, and such a colorant can be obtained by selection with various filters. As the ratio of the B component in the colored master pellet of the present invention,
Preferably, the B component is 0.0% in 100% by weight of the coloring composition.
05 to 10% by weight. Within such a range, the optical recording medium has a sufficient chroma when used as an optical recording medium, is capable of coloring with a good design, and has good electrical properties when optical molded articles such as optical disk substrates are molded. A molded article is obtained. The ratio of the component B is more preferably 0.01 to 10
%, Particularly preferably 0.05 to 5% by weight.

The shape of the colored master pellet of the present invention is as follows:
The size and shape are not particularly limited as long as they are used as colored master pellets for molding, particularly colored master pellets for optical molding materials. However, the length is 2.0-3.3 mm, preferably 2.1-3.3 mm.
3.1 mm and the length of the major axis in the cross section is 2.5
Advantageously, they are between 3.5 and 3.5 mm, preferably between 2.7 and 3.3 mm. The shape of the cross section may be any of a circle, an ellipse and a rectangle, but a circle or an ellipse is desirable. In the case of an elliptical shape, the ratio of the major axis / minor axis in the cross section is 1.
Those having an elliptical cross-sectional shape of 2 to 1.8, preferably 1.3 to 1.7 are preferred. The colored master pellet of the present invention is used to obtain a colored optical molded product by mixing and molding with a transparent pellet as described later. The shape and size of the transparent pellets at this time are in the ranges described in the above-mentioned description of the shape of the colored master pellet. In a preferred embodiment at the time of molding, it is advantageous that the shapes of the colored master pellet and the transparent pellet are substantially the same.

The colored master pellets of the present invention are characterized in that there is very little variation in the concentration of the coloring agent (component B) in each pellet. That is, the colored master pellets of the present invention represent the concentration of the colorant in each pellet by absorbance, and when the average value is X, the ratio of the number of pellets satisfying the range of 0.5X to 1.5X But at least 90%, preferably at least 9
5%. The variation in the concentration is represented by the variation in the absorbance of a solution obtained by dissolving individual pellets in a solvent as described later.

In a preferred embodiment of the colored master pellet of the present invention, when the concentration of the coloring agent in each pellet is represented by absorbance and the average value is represented by X, 0.6X to 1.3.
The proportion of the number of pellets satisfying the range of X is at least 90%, preferably at least 95%. The most preferred embodiment of the colored master pellets of the present invention is the range of 0.7X to 1.2X, particularly 0.9X The proportion of the number of pellets having a colorant concentration that satisfies the 1.1X range is at least 93%, preferably at least 95%.

Further, the colored master pellet of the present invention can be produced by various methods.
(1) A method in which a colorant is uniformly mixed with a thermoplastic resin and then melt-kneaded. (2) A single or a plurality of colorants are added to the resin at a high concentration and dry-blended using a mixer such as a Henschel mixer. A method in which a colored master composition is obtained, and further mixed with the remaining thermoplastic resin and melt-kneaded. (3) The colorant is independently supplied to a melt-kneader such as an extruder and melt-kneaded with the resin. Method, (4) a method of dissolving a colorant in an organic solvent, and then directly supplying the solution to a molten resin kneader (in this case, the colorant solution is preferably filtered), and (5) a method of the above (4). A method of adding a colorant solution to a resin at a high concentration to prepare a colored master composition with a mixer such as a Henschel mixer, and then melt-kneading with the remaining resin components; Extrusion independently And (7) mixing a colorant solution and a thermoplastic resin solution (in this case, the solution is preferably filtered), and removing the solvent with a spray drier or the like. (8) a method in which a mixed solution of a colorant solution and a thermoplastic resin solution is directly supplied to a melt kneader such as an extruder to obtain pellets. These methods can be appropriately modified and implemented. In carrying out these methods, the colorant used is finely crushed so as not to contain large particles,
When large particles are present, it is desirable to classify them using a sieve. When the colorant is mixed and kneaded with the resin, the type and conditions of the kneader should be selected so that the colorant is well and uniformly dispersed in the resin.

According to the study of the present inventors, the improved method (2) has been found as an industrially advantageous method for obtaining the colored master pellets aimed at by the present invention. According to this improved method, a color master composition (powder mixture) is obtained by uniformly dry blending a colorant powder and a thermoplastic resin powder containing no colorant, and the composition contains a colorant. The desired colored master pellet can also be obtained by mixing with a thermoplastic resin powder or pellet and melt-kneading it. According to this method, industrially advantageous and good quality colored master pellets can be obtained as compared with the other methods described above.

The improved method is suitable for obtaining colored master pellets in which the thermoplastic resin (component A) is an aromatic polycarbonate resin. The case where the above-mentioned improvement method is carried out using powder of an aromatic polycarbonate resin (PC) will be described below. The colorant-free polycarbonate resin powder (referred to as “PC powder”) has an average particle size of 0.10 to 0.55 mm, preferably 0.15 to 0.5 mm.
mm, particularly preferably in the range of 0.25 to 0.40 mm.

When the PC powder and the colorant are mixed to obtain a colored master composition (powder), the mixing ratio is, for example, P
C powder 40 to 99.9% by weight and colorant 0.1 to 60
% By weight, preferably 60 to 99% by weight of PC powder and 1 to 40% by weight of colorant, particularly preferably PC
A range of 70-95% by weight of the powder and 5-30% by weight of the colorant is suitable. The powdered color master composition is obtained by uniformly mixing the PC powder and the colorant powder in the above ratio. Colored master composition and transparent PC pellets or P
The colored master pellets of the present invention can be obtained by mixing and melting the C powder. Here "Transparent PC pellets"
Means polycarbonate resin pellets containing no colorant.

At this time, the mixing ratio of the coloring master composition to the transparent PC pellets or PC powder is selected so that the ratio of the coloring agent and the resin in the mixture falls within the range specified for the coloring master pellets of the present invention. I just need. The mixing ratio may be determined in a suitable range in consideration of the content of the coloring agent in the target coloring master pellet, the content of the coloring agent in the coloring master composition, the type of the coloring agent, and the like.
That is, the coloring master composition of the present invention is obtained by mixing the coloring master composition with a transparent PC pellet or PC powder. At this time, the mixing ratio of the coloring master composition to the transparent PC pellets or PC powder is 0.5 to 50% by weight of the former.
And the latter is preferably in the range of 50 to 99.5% by weight. Preferred mixing ratios are 1-20% by weight of the former and 80-9% of the latter.
9% by weight, and a particularly preferable range is the former 2-1.
0% by weight and the latter in the range of 90-98% by weight. When the optical molded product of the present invention is obtained, the ratio of the colored master pellet to the transparent PC pellet is desirably in the range of 3 to 50% by weight of the former and 50 to 97% by weight of the latter. Preferred mixing ratios are 5 to 30% by weight of the former and 70 to 95% by weight of the latter.
And particularly preferred ranges are 10 to 25% by weight of the former and 75 to 90% by weight of the latter.

According to the study of the present inventors, if the colored master pellet contains small strips generated during the production of the pellet (mainly at the time of cutting the strand), the colored master pellet is used to form an optical disk. It was found that when such an optical molded product was molded, unique color unevenness and color streaks based on the coloring composition were generated unlike simple silver development, and a molded product having a problem in electrical characteristics was obtained. Since the size and amount of the pellet flakes affect the quality of the optical molded product, it is desirable that the pellet flakes be controlled so as not to be generated below a certain level or removed by means such as a sieve.

That is, according to the study of the present inventors, the content of the powder having a particle size of 2.0 mm or less formed from the same coloring composition as the coloring master pellet is 5% by weight or less, preferably 3% by weight. The following is provided a colored master pellet. Here, the particle size of the powder refers to the length of the major axis of the longest part. More preferably, the content of the powder having a particle size of 2.0 mm or less is 1% by weight or less, and most preferably 0.5% by weight or less.

The preferred colored master pellet of the present invention has a content of powder having a size of 1.0 mm or less contained therein of 500 ppm or less, preferably 300 ppm or less.
Most preferably, 100 ppm or less is advantageous. Particularly preferred colored master pellets of the present invention have a powder content of 0.5 mm or less contained therein having a content of 200 p.
Advantageously less than pm, preferably less than 100 ppm, most preferably less than 50 ppm.

As described above, in the colored master pellet of the present invention, the variation in the concentration of the coloring agent between the individual pellets is set within a certain range, and the content ratio of the particles of the coloring agent having a certain size contained in the pellet is controlled. By controlling and controlling the fine particles of the pellets, it is possible to obtain an optical molded product with extremely low color unevenness and color streaks and excellent electrical characteristics.

One means of producing the colored master pellets having a low powder content of the present invention is to adjust the cutting conditions of the strands during the production of the pellets to minimize the amount of powder generated. For example, when a resin composition is extruded with an extruder into a strand and cut with a cutter to obtain pellets, it is desired that the pellets have a circular or elliptical cross-section and have few irregularities. In order to reduce the unevenness of the cross-sectional shape, it is desirable to cool the strand at a temperature as uniform as possible around the strand, and at that time, the temperature of the strand at the time of cutting the cutter is preferably 110 to 140 ° C, more preferably It is desirable to cool to 120 to 130 ° C. Thus, the twist of the strand can be reduced, and the unevenness of the surface on the cut surface can be reduced as much as possible. Further, the powder once generated at the time of cutting the cutter can be separated and removed by using a sieve, or can be separated and removed by a gravity classifier using wind power.

As described above, the colorant master pellet of the present invention can be obtained by the most common method of cutting a melt-extruded strand. Therefore, its shape is basically cylindrical. Although a shape such as a prismatic shape is also possible, a columnar shape enables uniform cooling of the strand and can suppress so-called miscut or double cut with a pelletizer. Therefore, it is suitable for obtaining pellets having a more uniform shape.

Further, the colorant master pellet of the present invention is composed of a giant pellet having a length of 4 mm or more.
Those satisfying an average condition of less than 1 piece per 0 g are preferable. The existence of a giant pellet whose length is more than a certain value
It becomes an unstable factor when screwing in during molding. Particularly in the field of optical recording media in which the molding cycle is extremely short, such instability factors tend to cause uneven mixing of the resin. Therefore, the presence of pellets, which did not cause a problem in the case of ordinary non-coloring, also causes problems such as color unevenness and non-uniform optical characteristics in a colored optical resin molded article such as an optical recording medium. The number of giant pellets having a length of 4 mm or more is preferably less than 1 piece per 100 g, and more preferably less than 1 piece per 500 g.

Various methods can be used for measuring the length of the pellet. For example, a method can be adopted in which the pellets are passed one by one through an optical sensor or a sound wave sensor, and the length is measured based on information obtained therefrom. Alternatively, a method of calculating the length of the pellet by an image processing method may be used.

On the other hand, in order to reduce as much as possible a giant pellet having a specific length or more, it is necessary to stably cut the strand. For that purpose, it is necessary to manufacture pellets in consideration of the following factors. Consider the wear of the cutter blade of the pelletizer and the clearance between the fixed blade and the rotary blade, and prevent cutting errors caused by them. The temperature of the strand is stabilized, and cutting is performed in a state where the hardness of the strand is almost constant, thereby preventing a cutting error. To draw the strands into the pelletizer at a constant speed, use a pelletizer in which the speed of the draw-in roll is stable and the roll has sufficient torque. In order to stabilize the thickness of the strand, consider the design of the die of the extruder, and in some cases, stabilize the discharge amount by interposing a gear pump or the like to stabilize the thickness of the strand. This is because the variation in the thickness causes a variation in the pressing force of the roll between the strands, thereby varying the drawing speed of the strand. The distance between the roll and the cutter blade is reduced to prevent the strand from being greatly deformed by the shearing force of the cutter blade. In addition, there is a cost problem as compared with the above basic operation. However, pellets roughly sieved by a sorter are individually detected by an optical sensor or the like, and those having a specific length or more are sorted. Methods can also be mentioned.

The colored master pellet of the present invention, which has a small content of a foreign matter of a specific size, does not cause a polarization defect (white defect) even in a high-temperature and high-humidity environment, and has an error in reading a record. It is suitable for obtaining a small and highly reliable optical molded product (for example, an optical disk).
In the present invention, the "foreign matter" refers to a contaminant mixed in various steps in every step of manufacturing a thermoplastic resin (for example, an aromatic polycarbonate resin) from a raw material and further molding an optical molded article. Raw materials used (additives such as monomers, solvents, stabilizers, release agents,
All components insoluble in methylene chloride, such as impurities and dust contained in a coloring agent, dust adhering to manufacturing equipment, and carbide generated during the molding process.

The colored master pellet of the present invention contains one or less foreign matter having a particle size of 200 μm or more per kg of the pellet. Preferably, there are 300 or less foreign substances having a particle size of 100 μm or more per 1 kg of pellets, and more preferably, 50 or more foreign substances having a particle size of 50 μm or more per 1 kg of pellets.
0 or less. Regarding the amount of minute foreign matters, it is preferable that the number of foreign matters having a particle size of 0.5 μm or more is 10,000 particles / g or less.

In order to obtain a thermoplastic resin having a small amount of foreign matter, a raw material having a small amount of impurities purified by sublimation, recrystallization or the like (additives such as monomers, solvents, stabilizers, release agents, coloring agents, etc.) may be used. After manufacturing by the above-mentioned conventionally known methods (solution polymerization method, melt polymerization method, etc.), filtration treatment in a solution state, or granulation (desolvation) of the granular raw material such as acetone under heating conditions To remove impurities and foreign matters such as low molecular weight components and unreacted components by washing with a poor solvent.In addition, in the extrusion step (pelletization step) for obtaining a pellet-like resin for injection molding, filtration is performed in a molten state. Accuracy 1
Foreign matter is removed, for example, by passing through a 0 μm sintered metal filter. If necessary, the addition of an additive such as a phosphorus-based antioxidant can also suppress the generation of foreign matter. In any case, it is necessary to minimize the content of foreign materials, impurities, solvents, and the like in the raw material resin before injection molding.

The colored master pellets of the present invention are pellets in which the dispersion of the concentration of the coloring agent among the individual pellets is extremely small. In other words, the colored master pellet of the present invention is a pellet in which the colorant is homogeneously and well dispersed. Moreover, the colored master pellets of the present invention are:
The content of pellet flakes (powder) is extremely low, and the content of foreign matter is also extremely low. Such a high-quality colored master pellet according to the present invention is mixed with a transparent thermoplastic resin pellet not containing a coloring agent (referred to as “transparent pellet”) and melt-molded to reduce color unevenness and color streaks. A colored optical molded product (for example, an optical disk) having good electric characteristics can be obtained.

The mixing ratio between the colored master pellets and the transparent pellets is not particularly limited. A preferable mixing ratio is a range of 3 to 50% by weight, preferably 5 to 30% by weight, particularly preferably 10 to 25% by weight, when the total of the two is 100% by weight. %, Preferably from 95 to 70% by weight, particularly preferably from 90 to 75% by weight. The size and shape of the transparent pellets mixed with the colored master pellets are preferably selected from the same range as the aforementioned colored master pellets, and the most preferred embodiment is that both pellets have substantially the same shape and size. is there. It is preferable that the transparent pellets have a small content of fine particles and foreign matter in the same range as described in the colored master pellets.

As a method for obtaining an optical molded product from the colored master pellet and the transparent pellet of the present invention, various conventionally known methods can be used, for example, molding into a desired shape by injection molding, extrusion molding, compression molding or the like. be able to. INDUSTRIAL APPLICABILITY The present invention is suitable for a disk-shaped optical recording medium such as a colored optical disk, particularly a colored CD-R and a colored DVD-R, as well as a plate-shaped molded article such as an optical card. This is suitable for various embodiments of a laminated recording medium having These optical recording media are suitable for various video software, computer software, and game machine software.

Furthermore, the colored master pellets of the present invention
As described above, since there is very little variation in the concentration of the colorant, an optical molded product can be obtained by molding itself, that is, without mixing with a transparent pellet. As such an optical molded product, a colored optical disk, specifically, a colored CD-
R and colored DVD-R can be exemplified.

[0093]

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 color unevenness Using the blended pellets shown in Table 2, a cylinder temperature of 350 was obtained using an injection molding machine [S480 / 150, Sumitomo Heavy Industries, Ltd.].
100 ° C. and a mold temperature of 120 ° C., 100 sheets of color unevenness evaluation formed 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 are connected to a spectrophotometer (dat
L * (brightness), a * under a D65 light source (correlated color temperature: 6504 K) using SF.
(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

[0096]

(Equation 1)

(2) Measurement of color streaks Color unevenness evaluation 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

(3) Observation of the appearance of the optical disc The appearance of the optical disc obtained above was visually observed. (4) Measurement of BLER Using the following blended pellets, using an injection molding machine (DISK3MIII manufactured by Sumitomo Heavy Industries, Ltd.), thickness 1.2 mm, 12
It is molded into a substrate with Al of 0 mmφ, and the BLER of this substrate is measured with a BLER measuring device (manufactured by Sony, CDplayer co.
control unit CDS-3000). Note that C1AVE in Table 4 is an average value per second of C1 errors (random errors that can be corrected by the C1 code).

(5) Light Transmittance Characteristics The test piece for measuring light transmittance was prepared by molding the obtained pellet into an injection molding machine [Sumitomo Heavy Industries S480 / 150] at a cylinder temperature of 350 ° C. and a mold temperature of 120 ° C. at a length of 50 mm. × width 9
A molded plate for transmittance evaluation of 0 mm × 0.6 mm in thickness was prepared. This molded plate is made by Hitachi Ltd.'s self-recording spectrophotometer U
The light transmission characteristics were measured using Model-3200,
Maximum light transmittance at each wavelength from 0 nm to 400 nm,
Minimum light transmittance at 400 nm to 650 nm,
The light transmittance at 650 nm was determined.

(6) Measurement of amount of powder After 5 kg of the colored master pellets were weighed, the pellets were placed in a circular vibrating sieve (TM-70-2S, manufactured by Tokuju Kosakusho).
Separate powders of 2.0 mm or less, 1.0 mm or less and 0.5 mm or less over 0 minutes. The weight of this powder was measured and expressed in ppm. (7) Measurement of Length of Colorant Master Pellets 500 g of each colorant master pellet shown in Table 1 was sampled. The pellets were carried one by one on a belt with a semi-cylindrical groove. Images of the pellets on the belt were input from CCD cameras installed on the top and side, and the length and diameter of each pellet were measured by image analysis. Three such CCD cameras were provided, and the average of three points of data recorded from them was calculated as the length and diameter of the pellet.

(8) Measurement of Foreign Material Content For foreign materials having a size of 200 μm or more, a certain amount of the pellet 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. Also, 0.5
For foreign substances having a size of μm or more, the above solution is subjected to a liquid particle counter (HI
(AC, manufactured by ROYCO).

(9) 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 1,000 hours. The number of white defects (polarization defects) having a thickness of 20 μm or more 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. (10) Substrate laminating 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 power ×: Peelable by hand

(11) Method of measuring absorbance First, various colored master pellets dried at 120 ° C. for 5 hours were weighed, and one pellet (about 20 mg) was weighed in a volumetric flask and appropriately diluted and dissolved with chloroform (for example, 10
0, 200, 300, 500, 1000, 1500 times, etc.). The light transmittance of this solution at a wavelength of 400 nm to 700 nm is measured with a U-3200 type self-recording spectrophotometer manufactured by Hitachi, Ltd. using a quartz cell having an optical path length of 10 mm. The maximum absorption wavelength at that time is λmax. Let A be the dilution ratio of chloroform at which the light transmittance at λmax is in the range of 35 to 70%. At this dilution ratio A, the colored pellets 100
The absorbance of each of the pieces was measured in the same manner as described above. Incidentally, the absorbances at the concentrations of the respective colorants of Examples N, O, P and Q were as follows.

The results of the measurement of the colorant master pellets of Example N were as follows: λmax = 477 nm at a dilution ratio of 1500 times.
Had an average absorbance of 0.252. As a result of the measurement of the colorant master pellet of Example O, the absorbance at λmax = 478 nm was an average of 0.309 at a dilution factor of 700. As a result of the measurement of the colorant master pellet of Example P, the absorbance at λmax = 460 nm was 0.387 on average at a dilution factor of 300. The results of the measurement of the colorant master pellet of Example Q were as follows.
The absorbance at 634 nm was 0.195 on average.

The symbols and items indicating the components shown in Table 1 are as follows. Thermoplastic resin (component A) PC-1 Bisphenol A polycarbonate resin powder obtained by a phosgene method without using an amine catalyst having a viscosity average molecular weight of 15,200 (p-tert-
Butylphenol is used). The average particle size of this powder was 0.33 mm. PC-2 Among the wholly aromatic dihydroxy components obtained by the phosgene method using an amine catalyst having a viscosity average molecular weight of 14,800, 1,1-bis (4-hydroxyphenyl) -3,
3,5-trimethylcyclohexane [bisphenol T
MC] is 45 mol% and 4,4 ′-(m-phenylenediisopropylidene) diphenol [bisphenol M] is 55 mol% in aromatic polycarbonate copolymer powder (p-tert-butylphenol is used as a terminal stopper. Use) PC-3 Terminal hydroxyl group concentration: 34 mol%, viscosity average molecular weight: 15,3
Bisphenol A1 as transesterification catalyst
2 × bisphenol A disodium salt per mole
Bisphenol A polycarbonate resin pellets obtained by melt transesterification using 10 ^-7 mol

Colorant (Component B) Red Dye-1: Perinone red dye, manufactured by Arimoto Chemical Co., Ltd.
last Red 8370 Red dye-2: Perylene fluorescent red dye, L manufactured by BASF
umogen F Red 305 Red Dye-3: Coumarin fluorescent red dye, Bayer M
Arolex Fluorescent Red G Red Dye-4: Thioindigo-based fluorescent red dye, Arimoto Chemical's Plast Red D54 Red Dye-5: Perinone-based red dye, Kiwa Chemical's K
p Plast RedHG Red dye-6: Perinone-based red dye, manufactured by Kiwa Chemical Co., Ltd.
p Plast RedH2G Yellow dye-1: Quinoline 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, Bayer Ma
crolex Blue RR

Other additive components ST: Tris (2,4-di-tert-butylphenyl phosphite), Irgaf manufactured by Ciba-Geigy Japan
os168 L1: glycerin monostearate, RIKEN VITAMIN CO., LTD. LIQUEMAL S-100A

Examples A to R, 1 to 25 and Comparative Example A,
B, 1 to 3 <Production of colored master pellets and transparent pellets> First, the colored master pellets A to R were prepared so that the content of the colorant component and the additive component shown in Table 1 was 10% by weight. , And uniformly mixed with a Henschel mixer to obtain a coloring master composition and an additive master composition. Next, the master composition was mixed with the remaining resin components so as to have the composition ratio shown in Table 1, and the mixture was uniformly mixed with a tumbler. After that, diameter 30m
Twin screw extruder with vent of mφ [Kobe Steel, Ltd. KTX
[−30], the mixture was melt-kneaded at a cylinder temperature of 280 ° C. while being evacuated from a vent, and extruded into pellets (pellet shape: 2.7 mm in diameter × 3.0 mm in length). A filter was installed at 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 1 g. In addition, all of the above devices were placed in an atmosphere of 101.8 kPa in which clean air circulating through a filter was used, and ion-exchanged water was used as cooling water.

The colorant master pellets A to Q are:
As a cooling method, a method of cooling the strand by passing the strand over a corrugated sheet through which cooling water was flown (corrugated sheet cooling method) was used, and the pellet temperature immediately after cutting with a cutter was 132 ° C. While the pellets were dropped into a rectangular conduit, ionized air was allowed to flow countercurrently to separate and remove the powder adhering to the pellets.

The coloring master pellet X was prepared by mixing the colorant component, the additive component and the thermoplastic resin of the component A shown in Table 1 directly with a tumbler only so as to have the composition ratio shown in Table 1. Thereafter, the mixture was melt-kneaded at a cylinder temperature of 280 ° C. and extruded into pellets while evacuating from the vent with a twin-screw extruder having a vent of 30 mmφ [KTX-30, Kobe Steel Ltd.]. At this time, no filter was installed in the die portion of the extruder. In addition, tap water was used as the water for cooling the above equipment. The colored master pellet X was cooled by passing the strand through a 27 ° C. water bath for 5 seconds as a cooling method. The pellet temperature immediately after cutting with a cutter was 83 ° C., and fine powder was not removed by ionized air. Was. In addition, 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 colored master pellets A to Q.

[0111]

[Table 1]

[0112]

[Table 2]

[0113]

[Table 3]

<Manufacture of CD disk> An injection molding machine, D, manufactured by Sumitomo Heavy Industries, Ltd.
Attach a mold for exclusive use of CD to ISK3 M III, attach a pitted nickel stamper for CD to this mold, and put the molding material into the hopper of the molding machine by automatic conveyance. A substrate having a diameter of 120 mm and a thickness of 1.2 mm was molded under the conditions of a mold temperature of 75 ° C., an injection speed of 100 mm / sec, and a holding pressure of 3920 kPa, and a CD disk was obtained using this substrate. These C
Table 4 shows the evaluation results of the D disk.

[0115]

[Table 4]

<Manufacture of CD-R Disc> A disc substrate was molded using the molded pellets shown in Table 2, and a dye-based recording layer was formed thereon to produce a CD-R disc. Table 5 shows the evaluation results of these CD-R discs.

[0117]

[Table 5]

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

<Manufacture of DVD Disk> Using the molded pellets shown in Tables 2 and 3, a mold dedicated to DVD was attached to an injection molding machine, DISK3 M III manufactured by Sumitomo Heavy Industries, Ltd., and an address signal and the like were attached to this mold. A DVD stamper made of nickel containing the information of
0 ° C, Mold temperature 115 ° C, Injection speed 300mm / sec
c, a diameter of 120 mm under the condition of a holding pressure of 3920 kPa,
A DVD substrate having a thickness of 0.6 mm was molded, and a DVD disk was obtained using this substrate. Table 6 shows the evaluation results of these DVD disks.

[0120]

[Table 6]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09B 1/28 C09B 1/28 5/14 5/14 56/00 56/00 57/00 57/00 Z 67/22 67/22 D G11B 7/24 526 G11B 7/24 526P 526R (72) Inventor Shimizu Hisa 1-2-2 Uchisaiwaicho, Chiyoda-ku, Tokyo F-term (reference) 4F070 AA50 AB09 AB22 AC39 AC45 AD04 AE04 FA01 FB03 FB04 FB06 FB08 4F071 AA14 AA22 AA31 AA43 AA48 AA50 4H056 AA01 AB03 AD09B AD24B AD27B DD04 EA13 FA01 4J002 BB001 BC021 BG001 CF001 CF161 KD09 GS02 5D

Claims (25)

[Claims] 1. A colored master pellet formed from a coloring composition comprising a transparent thermoplastic resin (A component) containing a coloring agent (B component). Expressed as X, the colored master pellets for optical molded articles in which the proportion of the number of pellets having a colorant concentration satisfying the range of 0.5X to 1.5X is at least 90%. 2. The pellet has a length of 2.0 to 3.
3 mm and the length of the major axis in the cross section is 2.5 to
The colored master pellet according to claim 1, having a shape of 3.5 mm. 3. The colorant concentration in each pellet is represented by absorbance, and the average value is represented by X: 0.6X
2. Colored master pellets according to claim 1, wherein the proportion of the number of pellets having a colorant concentration satisfying the range of ~ 1.3X is at least 90%. 4. When the concentration of a colorant in each pellet is represented by an absorbance and the average value is represented by X, 0.5X
2. Colored master pellets according to claim 1, wherein the proportion of the number of pellets having a colorant concentration satisfying the range of ~ 1.5X is at least 95%. 5. A particle size formed from the coloring composition.
The colored master pellet according to claim 1, wherein the content of the powder having a diameter of 0 mm or less is 250 ppm or less. 6. A particle size formed from the coloring composition.
The colored master pellet according to claim 1, wherein the content of the powder having a diameter of 0 mm or less is 5% by weight or less. 7. The colored master pellet according to claim 1, wherein the number of foreign matters having a particle size of 200 μm or more is one or less per kg of the pellet. 8. The colored master pellet according to claim 1, wherein the transparent thermoplastic resin (A component) is an aromatic polycarbonate resin having a viscosity average molecular weight of 10,000 to 22,000. 9. The coloring master pellet according to claim 1, wherein the coloring composition has a coloring agent (component B) content of 0.005 to 10% by weight. 10. The colored master pellet according to claim 1, wherein the coloring agent (B component) is an anthraquinone dye, a perinone dye, a quinoline dye, a perylene dye, a coumarin dye or a thioindico dye. 11. An optical resin molding material comprising 3 to 50% by weight of the colored master pellet according to claim 1 and 97 to 50% by weight of a pellet formed of a transparent thermoplastic resin. 12. A colored optical disc formed from the molding material according to claim 11. 13. A colored CD-R or DVD-R formed from the molding material of claim 11. 14. The method according to claim 14, wherein the coloring agent is CI Solvent.
Yellow 33, CI Solvent Yellow
ow 157, CI Solvent Yellow
98, CI Disperse Yellow 54,
CI Disperse Yellow 160, CI
Vat Yellow 4, CISolvent Y
yellow160: 1 and LUMOGE manufactured by BASF
The yellow-colored master pellet of claim 1 selected from the group consisting of N series F Yellow083. 15. The method according to claim 15, wherein the coloring agent is CI Solvent.
Blue 87, CI Solvent Blue 9
4, CI Solvent Blue 97, CI S
solvent Violet 13, CI Solve
nt Violet 14 and CI Dispers
The blue-colored master pellet of claim 1, selected from the group consisting of e Violet 28. 16. The method according to claim 16, wherein the coloring agent is CI Solvent.
Red 22, CI Solvent Red 52, C
I Solvent Red 149, CI Solv
ent Red 150, CI Solvent Re
d 151, CI Solvent Red 168,
CI Solvent Red 191, CI Sol
vent Red 207, CI Solvent R
ed135, CI Solvent Red 179,
CI Vat Red 2, CI Vat Red 4
1, CI Vat Red 47, CI Solven
t Orange 55, CI Solvent Or
angel 60, CI Solvent Orange
63, CI Vat Orange 1, CI Va
t Orange 2, CI Vat Orange
4, CI Vat Orange 9, manufactured by Bayer AG
MACROLEX Fluorescent Red
G, F Re of LUMOGEN series manufactured by BASF
d 305, F Red 339 and F Orange
The red colored master pellet of claim 1 selected from the group consisting of e240. 17. The method according to claim 16, wherein the coloring agent is CI Solvent.
Green 3, CI Solvent Green
The green colored master pellet of claim 1, selected from the group consisting of CI 20 and CI Solvent Green 28. 18. The method according to claim 18, wherein the colorant is (i) CI Solvent.
t Green3, CI Solvent Green
20 and CI Solvent Green 28
A green dye selected from the group consisting of: (ii) CI
Solvent Red 22, CI Solvent
Red 52, CI Solvent Red 15
1, CI Solvent Red 168, CISo
lvent Red 191, CI Solvent
Red 207, CI Solvent Red 13
5, CI Solvent Red 179, CI S
The black-colored master pellet of claim 1, comprising a red dye selected from the group consisting of solvent orange 60. 19. The method according to claim 19, wherein the coloring agent is (i) CI Solvent.
nt Blue 87, CI Solvent Blue
94, CI Solvent Blue 97, CI
Solvent Violet 13, CI Solv
entViolet 14 and CI Dispers
e Violet 28 and a blue dye selected from the group consisting of: (ii) CI Solvent Yellow.
33, CI Solvent Yellow 15
7, CI Solvent Yellow 98, CI
Disperse Yellow 54, CI Di
The black-colored master pellet according to claim 1, comprising a yellow dye selected from the group consisting of sperse Yellow 160. 20. A coloring master pellet formed from a coloring composition comprising an aromatic polycarbonate resin containing a coloring agent, wherein (1) the concentration of the coloring agent in each of the pellets is represented by an absorbance, and the average value thereof is calculated. X, the proportion of the number of pellets having a colorant concentration satisfying the range of 0.5 to 1.5X is at least 90%,
(2) The pellet has a shape in which the length is 2.0 to 3.3 mm and the length of the major axis in the cross section is 2.5 to 3.5 mm. (4) The content of the powder having a particle size of 1.0 mm or less formed from the coloring composition is 2 or less per kg of the pellets.
A colored master pellet for an optical molded product, which is 50 ppm or less. 21. A powdery coloring master composition is prepared by uniformly mixing (1) a coloring agent powder and an aromatic polycarbonate resin powder, and (2) the coloring master composition and an aromatic polycarbonate resin. Powder or pellets, the content of the coloring agent in the resulting mixture is 0.00
5 to 10% by weight, and then (3) the obtained mixture is melt-kneaded and pelletized. The coloring concentration in each pellet is represented by absorbance, and the average value is expressed. A method for producing a colored master pellet for an optical molded product, wherein when X is the number of pellets having a colorant concentration satisfying the range of 0.5X to 1.5X is at least 90%. 22. The method for producing a colored master pellet according to claim 21, wherein the aromatic polycarbonate resin powder has a shape having an average particle size of 0.10 to 0.55 mm. 23. A colored pellet formed from a coloring composition comprising a transparent thermoplastic resin (A component) containing a coloring agent (B component), wherein the concentration of the coloring agent (B component) in each of the pellets. Is expressed as an absorbance, and when the average value is X, the proportion of the number of the pellets having the colorant concentration satisfying the range of 0.5 to 1.5X is at least 90%, and the coloring for the optical molded article is at least 90%. pellet. 24. An optical disk formed from the colored pellet according to claim 23. 25. A colored CD-R or a colored DVD-R formed from the colored pellets according to claim 23.