JP2013010973A - Thermoplastic resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition few in commingling of transparent foreign matter, and excellent in transparency, appearance of a molded item; heat resistance, weatherability, and mechanical strength such as elongation at break and impact strength.SOLUTION: This thermoplastic resin composition includes an aromatic polycarbonate and thermal stabilizer, and as necessary, ultraviolet absorber and mold release agent, where the aromatic polycarbonate is obtained by melt polymerization of an aromatic dihydroxy compound and a diester carbonate compound; where the number N (pieces/g) of transparent foreign matters of ≥10 μm and a viscosity-averaged molecular weight Mv satisfy the formula; (1) or (2): N≤exp(6.824×10×Mv-8.626) (1) when Mv≤21,000; and N≤exp(8.514×10×Mv+3.916) (2) when Mv>21,000.

Description

  The present invention provides a thermoplastic resin composition excellent in transparency, molded article surface appearance, mechanical strength, thermal stability, and weather resistance obtained by melt polymerization of an aromatic dihydroxy compound and a carbonic acid diester compound. is there.

  Aromatic polycarbonate is excellent in mechanical properties such as impact resistance, thermal properties, electrical properties, transparency, moldability, etc., and is widely used for various mechanical parts and automotive parts. ing. In particular, there are great expectations for optical applications such as optical fibers, lenses, optical information recording media, etc., and various studies have been actively conducted. In such optical applications, the appearance of a thermoplastic resin composition having a low foreign matter content is particularly desired.

  As a method for producing an aromatic polycarbonate, a so-called phosgene method in which an aromatic diol such as bisphenol and phosgene are reacted in an interfacial polycondensation method has been industrialized. However, the phosgene method requires the use of phosgene, which is harmful to the human body, requires a solvent such as dichloromethane, which has a high environmental impact, and mixes a large amount of by-product sodium chloride into the polymer. Problems such as corrosion when used in electronic parts have been pointed out. On the other hand, an aromatic diol compound and a carbonic acid diester compound are transesterified in a molten state, and a method of obtaining an aromatic polycarbonate while removing low molecular weight substances such as phenol as a by-product from the system is also known as a melt polymerization method or a transesterification method. It has long been known as The melt polymerization method has the above-mentioned problems by the interfacial polycondensation method and has the advantage that an aromatic polycarbonate can be produced. On the other hand, since the polymerization is performed at a higher temperature than the phosgene method, There is a problem that foreign matters such as burnt foreign matters and gel-like foreign matters are easily generated.

  In order to solve such problems, after adding an additive to an aromatic polycarbonate obtained by melt polymerization of an aromatic dihydroxy compound and a carbonic acid diester compound and melt-kneading with an extruder or the like, external dust or burnt foreign matter For the purpose of removing the polymer filter, methods for passing the polymer filter have been proposed (see, for example, JP-A-5-239334, JP-A-6-234845, JP-A 2000-178355, JP-A 3103652). ). However, as a result of studies by the present inventors, it has been found that transparent foreign matters of 10 μm or more are often generated in the resin even when the polymer filter is passed. Further, it has been found that this transparent foreign substance is inherently present in the polymer and cannot be collected even if it is filtered by a filter.

  Furthermore, if this transparent foreign matter occurs frequently, especially in an optical information recording medium such as a CD-R or DVD, not only will it cause a recording error, but if the external force is applied to the molded product, the transparent foreign matter will be destroyed. As a result, mechanical strength such as elongation at break and impact strength is reduced, and thermal stability and weather resistance are also deteriorated. Further, it was found that the surface of the film or sheet appeared as fish eyes (fish eyes), and the commercial value was significantly impaired.

  In the present invention, an aromatic polycarbonate (A) obtained by subjecting an aromatic dihydroxy compound and a carbonic acid diester compound to a melt polymerization reaction under specific conditions is blended with a heat stabilizer (B), and further absorbs ultraviolet rays as necessary. Of a thermoplastic resin composition having excellent mechanical strength, transparency, appearance, thermal stability, and weather resistance, with very little occurrence of transparent foreign matters and burns by blending agent (C) and mold release agent (D) For the purpose of provision.

  The present inventors have reduced transparency and mechanical strength, cause molding defects, cause recording errors in information recording media, and cause a fish eye on the film or sheet surface, causing transparent eye damage that significantly impairs commercial value. We studied earnestly to prevent the generation and mixing of scallops and burns. As a result of the examination, it was found that the cause of transparent foreign matters and burns is a side reaction (crosslinking reaction) that occurs at the stage of melt polymerization at a high temperature in the presence of an ester exchange catalyst such as an alkali metal compound. In order to advance the main reaction (polycondensation reaction) activated by the catalyst while suppressing this side reaction, by controlling the reaction conditions to a specific catalyst amount, a specific temperature range, etc., transparent foreign matter to the aromatic polycarbonate In addition, the thermoplastic resin composition in which the aromatic polycarbonate obtained in this way is blended with a heat stabilizer, an ultraviolet absorber, and a release agent can suppress the progression of burns. It has been found that it is excellent in mechanical strength, transparency, appearance, thermal stability, and weather resistance, and has completed the present invention.

  That is, the gist of the present invention is that an aromatic polycarbonate obtained by melt polymerization of an aromatic dihydroxy compound and a carbonic acid diester compound has a transparent foreign matter number (N: units / g) of 10 μm or more and a viscosity average molecular weight (Mv). However, the following (1) or (2):

[Equation 1]
In the case of Mv ≦ 21000, N ≦ exp (6.824 × 10 ⁻⁴ × Mv−8.626) (1)
In the case of Mv> 21000, N ≦ exp (8.514 × 10 ⁻⁵ × Mv + 3.916) (2)

The heat stabilizer (B) is blended in an amount of 0.0001 to 1.0 part by weight with respect to 100 parts by weight of the aromatic polycarbonate (A) satisfying the relational expression represented by the formula, and an ultraviolet absorber (C) if necessary. Another object of the present invention is to provide a thermoplastic resin composition containing a mold release agent (D).

  According to the present invention, in order to prevent the mixing of transparent foreign matters into the product, the transparency and appearance of the molded product can be improved, and further, the thermal stability, weather resistance, further mechanical strength such as elongation at break, impact strength, etc. An excellent thermoplastic resin composition can be obtained.

Hereinafter, the present invention will be specifically described.
Aromatic polycarbonate (A) A carbonic acid diester compound and an aromatic dihydroxy compound are used as raw materials for melt polymerization in producing the aromatic polycarbonate (A) used in the present invention.
[Carbonate diester compound]
The starting carbonic acid diester compound is represented by the following formula (1).

(In the formula, R and R ′ are each an aliphatic group or an aromatic group having 1 to 18 carbon atoms, which may be substituted, and R and R ′ may be the same or different.)

  Specific examples of the carbonic acid diester compound represented by the formula (1) include substituted diphenyl carbonates such as dimethyl carbonate, diethyl carbonate, di-t-butyl carbonate, diphenyl carbonate, and ditolyl carbonate. Diphenyl carbonate and substituted diphenyl carbonate, particularly diphenyl carbonate are preferred. These carbonic acid diester compounds may be used alone or in admixture of two or more. In addition, halogen ions, which may be included as impurities in the carbonic acid diester compound depending on the production method, not only inhibit the side-reaction cross-linking structure formation reaction, but also poison the catalyst to cause the main reaction polycondensation reaction. In order to inhibit, the halogen ion in the carbonic acid diester compound is preferably not more than 30 ppb, more preferably not more than 20 ppb, and most preferably not more than 10 ppb on a weight basis.

  Moreover, you may use dicarboxylic acid or dicarboxylic acid ester with the above carbonic acid diester compounds in the quantity of preferably 50 mol% or less, more preferably 30 mol% or less. Examples of such dicarboxylic acid or dicarboxylic acid ester include terephthalic acid, isophthalic acid, diphenyl terephthalate, and diphenyl isophthalate. When such a carboxylic acid or carboxylic acid ester is used in combination with a carbonic acid diester compound, polyester carbonate is obtained.

[Aromatic dihydroxy compounds]
Another raw material, an aromatic dihydroxy compound, is represented by the following formula (2).

(In the formula, B is a divalent hydrocarbon group having 1 to 15 carbon atoms, a halogen-substituted divalent hydrocarbon group, an —S— group, an —SO ₂ — group, an —SO— group, —O; -Group or -CO- group, and X is a halogen atom, an alkyl group having 1 to 14 carbon atoms, an aryl group having 6 to 18 carbon atoms, an oxyalkyl group having 1 to 8 carbon atoms, or an alkyl group having 6 to 18 carbon atoms. Represents an oxyaryl group, m is 0 or 1, and y is an integer of 0-4.)

  Examples of the aromatic dihydroxy compound represented by the formula (2) include 2,2-bis (4-hydroxyphenyl) propane [= bisphenol A], 2,2-bis (4-hydroxy-3,5-dimethyl). Phenyl) propane, 2,2-bis (4-hydroxy-3,5-diethylphenyl) propane, 2,2-bis (4-hydroxy- (3,5-diphenyl) phenyl) propane, 2,2-bis ( 4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxyphenyl) pentane, 2,4'-dihydroxy-diphenylmethane, bis (4-hydroxyphenyl) methane, bis (4-hydroxy- 5-nitrophenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 3,3-bis (4-hydroxyphenyl) pen 1,1-bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl) sulfone, 2,4′-dihydroxydiphenylsulfone, bis (4-hydroxyphenyl) sulfide, 4,4′-dihydroxydiphenyl ether, Examples include 4,4′-dihydroxy-3,3′-dichlorodiphenyl ether, 4,4′-dihydroxy-2,5-diethoxydiphenyl ether, and the like. Among these, 2,2-bis (4-hydroxyphenyl) propane is preferable. Moreover, these aromatic dihydroxy compounds can be used individually or in mixture of 2 or more types.

  The mixing ratio of the carbonic acid diester compound and the aromatic dihydroxy compound is determined by the molecular weight and the terminal hydroxy group amount of the desired aromatic polycarbonate. The amount of terminal hydroxy groups has a great influence on the thermal stability and hydrolysis stability of the product polycarbonate, and is required to be 1000 ppm or less in order to have practical physical properties. Therefore, it is common to use an equimolar amount or more of a carbonic acid diester compound with respect to 1 mol of the aromatic dihydroxy compound, and 1.01 to 1.30 mol, preferably 1.01 to 1.20 mol, especially 1. It is desirable to be used in the range of 02 to 1.15 mol.

[Transesterification catalyst]
When producing an aromatic polycarbonate by a melt polymerization method, a transesterification catalyst is usually used. As the transesterification catalyst, alkali metal compounds and / or alkaline earth metal compounds are mainly used, and basic compounds such as basic boron compounds, basic phosphorus compounds, basic ammonium compounds, or amine compounds are supplementarily used. It is also possible to use together. These catalysts may be used alone or in combination of two or more.

  Examples of the alkali metal compound include lithium, sodium, potassium, rubidium, cesium hydroxide, hydrogen carbonate, carbonate, acetate, hydrogen phosphate, and phenyl phosphate, stearic acid, Examples include organic acids such as benzoic acid, alcohols such as methanol and ethanol, organic alkali metal compounds such as salts with phenols such as carboxylic acid and bisphenol A, and the like. Examples of alkaline earth metal compounds include beryllium, calcium, magnesium, strontium, barium hydroxide, inorganic alkaline earth metal compounds such as hydrogen carbonate, carbonate, acetate, organic acids, alcohols, and phenols. And organic alkaline earth metal compounds such as salts thereof.

  Specific examples of basic boron compounds include tetramethyl boron, tetraethyl boron, tetrapropyl boron, tetrabutyl boron, trimethylethyl boron, trimethylbenzyl boron, trimethylphenyl boron, triethylmethyl boron, triethylbenzyl boron, triethylphenyl boron, tributyl. Hydride such as benzyl boron, tributyl phenyl boron, tetraphenyl boron, benzyl triphenyl boron, methyl triphenyl boron, butyl triphenyl boron, sodium salt, potassium salt, lithium salt, calcium salt, magnesium salt, barium salt, or Examples include strontium salts.

  Examples of the basic phosphorus compound include triethylphosphine, tri-n-propylphosphine, triisopropylphosphine, tri-n-butylphosphine, triphenylphosphine, tributylphosphine, quaternary phosphonium salt, and the like.

  Examples of the basic ammonium compound include tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, trimethylethylammonium hydroxide, trimethylbenzylammonium hydroxide, trimethylphenylammonium hydroxide, Triethylmethylammonium hydroxide, triethylbenzylammonium hydroxide, triethylphenylammonium hydroxide, tributylbenzylammonium hydroxide, tributylphenylammonium hydroxide, tetraphenylammonium hydroxide, benzyltriphenylammonium hydroxide, methyltriphenylammonium hydroxide Sid, butyl triphenyl ammonium hydroxide, and the like.

  Examples of the amine compound include 4-aminopyridine, 2-aminopyridine, N, N-dimethyl-4-aminopyridine, 4-diethylaminopyridine, 2-hydroxypyridine, 2-methoxypyridine, 4-methoxypyridine, 2 -Dimethylaminoimidazole, 2-methoxyimidazole, imidazole, 2-mercaptoimidazole, 2-methylimidazole, aminoquinoline and the like.

  The catalyst amount is usually 0.01 to 10 μmol, preferably 0.05 to 1 μmol, more preferably 0.1 to 0.5 μmol, and particularly preferably 0.2 to 1 mol of the aromatic dihydroxy compound. It is used in the range of ˜0.35 μmol. If the amount is less than this amount, polymerization activity required for a long time to produce a polycarbonate having a predetermined molecular weight and a predetermined amount of terminal hydroxy group cannot be obtained. If the amount is higher than this amount, the polymer hue deteriorates and a crosslinked structure is formed. The amount of transparent foreign matter due to the reaction also tends to increase. In particular, when an alkali metal compound and / or an alkaline earth metal compound is used, the amount of the metal is preferably 0.01 to 2 μmol, more preferably 0.05 to 1 μmol, and more preferably 0.1 to 0.9 μmol. The range of is particularly preferable. As the contribution of the catalyst amount to the reaction rate, when an alkali metal compound catalyst is used, the primary reaction is primary, but the secondary reaction (crosslinked structure generation) is secondary, so Mv is 20000 or more. When producing a high molecular weight polycarbonate, it is preferable to employ a technique of increasing the temperature and reducing the amount of catalyst as described later.

[Transparent foreign matter]
The aromatic polycarbonate (A) according to the present invention is an aromatic polycarbonate obtained by melt polymerization of an aromatic dihydroxy compound and a carbonic acid diester compound. The number of transparent foreign matters (N: units / g) of 10 μm or more and viscosity average molecular weight (Mv) is the following (1) or (2):

[Equation 2]
In the case of Mv ≦ 21000, N ≦ exp (6.824 × 10 ⁻⁴ × Mv−8.626) (1)
In the case of Mv> 21000, N ≦ exp (8.514 × 10 ⁻⁵ × Mv + 3.916) (2)

Is satisfied. Preferably, the following (1 ') or (2'):

[Equation 3]
In the case of Mv ≦ 21000, N ≦ exp (6.52 × 10 ⁻⁴ × Mv−9.087) (1 ′)
In the case of Mv> 21000, N ≦ exp (1.115 × 10 ⁻⁴ × Mv + 2.179) (2 ′)

And more preferably (1 ″) or (2 ″) below:

[Equation 4]
In the case of Mv ≦ 21000, N ≦ exp (6.52 × 10 ⁻⁴ × Mv−9.78) (1 ″)
In the case of Mv> 21000, N ≦ exp (9.796 × 10 ⁻⁵ × Mv + 1.855) (2 ″)

It is preferable that the relational expression represented by

  In the present invention, “the number of transparent foreign matters of 10 μm or more” is obtained as follows. That is, for a film (thickness 70 μm) formed from an aromatic polycarbonate, using a stereomicroscope (200 times magnification), the total number of transparent foreign matters having a size of 10 μm or more was counted, and the number of foreign matters per 1 g was calculated. “The number of transparent foreign matters of 10 μm or more”. In the measurement, the planar boundary of a transparent foreign substance without a nucleus is determined by a difference in refractive index from the periphery, and the size thereof is the maximum distance between two points on the planar boundary. In the present invention, the “viscosity average molecular weight” is determined as follows. That is, “viscosity average molecular weight (Mv)” is calculated from the intrinsic viscosity [η] at a temperature of 20 ° C. in methylene chloride of an aromatic polycarbonate by the following formula.

[Equation 5]
[Η] = 1.23 × 10 ⁻⁴ Mv ^0.83

[Crosslinked structural unit]
The aromatic polycarbonate obtained by melt polymerization has various cross-linking structural units generated by side reactions such as heat transfer, decarboxylation, and dehydration condensation on the molecular chain. Typical examples are (a) phenyl salicylate structural unit represented by the following formula (3) (hereinafter abbreviated as PSA unit), (b) phenoxybenzoic acid structural unit represented by the following formula (4) (hereinafter referred to as “PSA unit”). And (c) a diphenyl ether dicarboxylic acid structural unit (hereinafter abbreviated as DCA unit) represented by the following formula (5).

  In the aromatic polycarbonate (A) according to the present invention, the total content of these three kinds of crosslinked structural units is preferably 2500 ppm or less, more preferably 2000 ppm or less, and particularly preferably 1500 ppm or less, based on the polymer weight. . When the total content of these three kinds of structural units is more than 2500 ppm, not only the number of transparent foreign substances in the aromatic polycarbonate increases but also the color tone deteriorates. The content of these crosslinked structural units can be measured directly by NMR by dissolving an aromatic polycarbonate in a deuterated solvent such as deuterated chloroform, or once the aromatic polycarbonate is hydrolyzed to cleave the carbonate bond in the main chain. After the monomer unit, it can be determined by measuring gel permeation chromatography, liquid chromatography, gas chromatography or the like. The total content of such cross-linked structural units (Tc: unit weight ppm) and the above-mentioned number of transparent foreign matters (N: 10 units / g) are expressed by the following formula:

[Equation 6]
In the case of Mv ≦ 21000, N = exp (2.616 × 10 ⁻³ × Tc + 1.518)
In the case of Mv> 21000, N = exp (8.109 × 10 ⁻⁴ × Tc + 4.613)

It was clearly understood that the origin of the transparent foreign matter was a crosslinked polymer. Therefore, it can be said that it is first necessary to suppress the crosslinking reaction in order to reduce the transparent foreign matter.

  In addition, since the content of the crosslinked structural unit directly affects the melting characteristics (particularly non-Newtonian properties) of the resin, the aromatic polycarbonate (A) according to the present invention conforms to JIS K7210 and has the following formula:

[Equation 7]
FRR = MVR (260 / 21.6) / MVR (260 / 2.16)

(In the formula, MVR (260 / 21.6) represents a melt volume flow rate measured at 260 ° C. and a load of 21.6 kg, and MVR (260 / 2.16) is 260 ° C. The melt volume flow rate measured at a load of 2.16 kg is shown.)
It is preferable that the flow rate ratio (FRR) represented by these is 17 or less, More preferably, it is 15 or less. If the FRR is greater than 17, it is not preferable because injection molding of precision molded products becomes difficult.

[Melt polymerization]
The aromatic polycarbonate (A) according to the present invention is produced in a multistage process including two or more stages such as an oligomerization process and a polymerization process by melt polymerization using the above-mentioned aromatic dihydroxy compound and carbonic acid diester compound as raw materials. The In general, the reaction is carried out while continuously removing the monophenol compound produced as a by-product from the line while raising the degree of pressure reduction from normal pressure at a reaction temperature of 140 to 320 ° C. and a reaction time of 0.1 to 5 hours. An inert gas such as nitrogen can be circulated as necessary. Further, a fractionation tower can be attached to the reactor in order to return the raw material accompanying the monophenol compound to the reaction tank. The reaction temperature in the oligomerization step is usually in the range of 100 to 300 ° C., preferably 180 to 280 ° C., and the reaction pressure is in the range of atmospheric pressure to 133 Pa. On the other hand, the reaction temperature at the final stage of the polymerization step is determined by the required performance such as the molecular weight of the aromatic polycarbonate, the color tone, and the amount of transparent foreign matter, and is usually 200 to 320 ° C. Since it becomes vigorous, it is preferable to complete the reaction at the lowest possible temperature. On the other hand, in order to obtain an aromatic polycarbonate having Mv = 20000 or higher, it is necessary to increase the reaction temperature. Therefore, at the stage where the reaction temperature is the highest, usually 250 to 320 ° C., preferably 260 ° C. to 300 ° C., more preferably 260 to 280 ° C, particularly preferably 260 to 275 ° C, and particularly preferably 260 to 270 ° C. Furthermore, since the external heating temperature also affects the formation of a crosslinked structure, it is preferably 320 ° C. or less, particularly preferably 300 ° C. or less, more preferably 295 ° C. or less, and particularly preferably 290 ° C. or less.

  The reaction pressure at the final stage of the polymerization step is also determined by required performance such as the molecular weight, color tone, and amount of transparent foreign matter of the aromatic polycarbonate, but is 300 Pa or less in order to obtain the aromatic polycarbonate of the present invention. In particular, in order to obtain a high molecular weight aromatic polycarbonate having an Mv of 20000 or more, it is necessary to shorten the time during which the resin is exposed to a high temperature in order to suppress the formation of transparent foreign matters. The pressure is preferably 70 Pa or less, particularly 50 Pa or less. The reaction time of each stage is appropriately determined depending on the degree of progress of the reaction, but preferably 0.1 to 10 hours in total in the oligomerization step and the polymerization step, and most preferably 1 to 6 hours. Since the residence time at the highest stage has a great influence on the generation of transparent foreign matter, it is preferably 0.1 to 5 hours, more preferably 0.2 to 3 hours, and particularly preferably 0.3 to 2 hours.

  Although there is no restriction | limiting in particular in the molecular weight of the aromatic polycarbonate (A) used by this invention, In order to obtain a practical physical property, a viscosity average molecular weight (Mv) is 14000-60000 normally, and 15000-50000 are especially preferable. In particular, from the viewpoints of impact resistance, mechanical strength, and moldability, 15000 to 40000, 15000 to 30000, particularly 16000 to 30000, more preferably 20000 to 30000 are preferable.

  The reaction method may be any of a batch method, a continuous method, and a combination of a batch method and a continuous method. The apparatus to be used may be any of a tank type, a tube type or a tower type. For example, a vertical polymerization tank equipped with various stirring blades, a horizontal uniaxial polymerization tank or / and a horizontal biaxial. A type of polymerization tank or the like can be used. The reaction is preferably carried out substantially in the absence of oxygen. For example, the inside of the raw material adjusting tank, the reactor and the piping is replaced with an inert gas such as nitrogen gas before the start of operation. Usually, a molten mixture of an aromatic dihydroxy compound and a carbonic acid diester compound is fed to a vertical reactor. The catalyst may be directly supplied to the first reaction tank through a line different from the raw material, or may be supplied in a state of being mixed with the raw material by a static mixer or the like in the pipe before entering the first reaction tank. . If necessary, a solvent for dissolving or suspending the catalyst is used. Preferable solvents include water, acetone, phenol and the like.

  It is preferable that the polymerization solution supply port is in the reaction vessel side wall liquid phase portion and the extraction port is in the reaction vessel bottom portion. In addition, the method of continuously extracting the reaction liquid from each tank is performed by a method suitable for the physical properties of the reaction liquid, such as a method using a drop, a method using a pressure difference, a method using a liquid feed pump such as a gear pump. Is preferred. In particular, a structure having a retention portion is not suitable for the production of the aromatic polycarbonate used in the present invention, and must be avoided as much as possible.

  In the aromatic polycarbonate used in the present invention, when an ester exchange catalyst such as an alkali metal compound is used in the production by melt polymerization, it is acidic to neutralize the catalyst remaining in the aromatic polycarbonate. 0.5 to 10 equivalents, preferably 1 to 5 equivalents of a compound, particularly a sulfur-containing acidic compound, can be added to one atom of the catalyst metal. That is, 0.01 to 20 ppm, preferably 0.1 to 10 ppm, more preferably 3 to 7 ppm is added to the weight of the aromatic polycarbonate.

  Examples of sulfur-containing acidic compounds are sulfonic acid, sulfinic acid or their ester derivatives, specifically p-toluenesulfonic acid, benzenesulfonic acid and dodecylbenzenesulfonic acid, their methyl, ethyl, butyl, Examples thereof include esters such as t-butyl, octyl, dodecyl, phenyl, benzyl and phenethyl, benzenesulfinic acid, toluenesulfinic acid, naphthalenesulfonic acid and the like. Of these compounds, esters of p-toluenesulfonic acid or esters of benzenesulfonic acid are preferred, and two or more of these compounds may be used. Furthermore, it is preferable to use alkali metal salts of these compounds in combination with these compounds because the dispersibility is improved and the deactivation effect is enhanced. As an amount to be used in combination, it is preferable to use an alkali metal salt in an amount of about 0.3 to 3 times by weight with respect to the non-alkali metal salt.

  The sulfur-containing acidic compound can be added to the aromatic polycarbonate by any method. For example, a sulfur-containing acidic compound can be added or dispersed directly or diluted with a diluent and added to an aromatic polycarbonate in a molten or solid state. Specifically, in the polycondensation reactor, in the transfer line from the reactor, it can be supplied and mixed in the extruder, and is usually supplied in the extruder. Moreover, after mixing with aromatic polycarbonate, pellets, flakes, powders and the like of other types of polymers with a mixer or the like, they can be supplied to an extruder and kneaded. Among these, it is preferable to add a stock solution of a sulfur-containing acidic compound to the flakes of aromatic polycarbonate, add it as a master batch after mixing with a mixer or the like. Furthermore, when adding, it is preferable to control the addition amount with high accuracy using a weight feeder or the like.

  Heat stabilizer (B) Examples of the heat stabilizer (B) used in the present invention include hindered phenol compounds, phosphorus compounds, sulfur compounds, epoxy compounds, hindered amine compounds, and the like. Among these, at least one heat stabilizer selected from hindered phenol compounds and phosphorus compounds is preferably used.

  The hindered phenol compound is preferably one represented by the following formula (6).

(In the formula (6), R ¹ and R ² are each a hydrocarbon group having 1 to 10 carbon atoms, and may be the same or different, and Y is selected from an ester group, an ether group, and an amide group. It is a C1-C20 hydrocarbon group which may contain a functional group and / or a phosphorus atom, and Z is a C1-C6 hydrocarbon group which may contain an oxygen atom and / or a nitrogen atom. A sulfur atom or a single bond, and g represents an integer of 1 to 4.)

  Specifically, n-octadecyl-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate, 1,6-hexanediol-bis [3- (3,5-di- t-butyl-4-hydroxyphenyl) propionate], pentaerythrityl-tetrakis [3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate], 3,9-bis [1, 1-dimethyl-2- {β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} ethyl] -2,4,8,10-tetraoxaspiro [5,5] undecane, tri Ethylene glycol-bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 3,5-di-tert-butyl-4-hydroxybenzyl phospho -Diethyl ester, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, 2,2-thio-diethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], tris- (3,5-di-t-butyl-4-hydroxybenzyl) -isocyanurate, N, N′-hexamethylenebis ( 3,5-di-t-butyl-4-hydroxy-hydrocinnamide) and the like. Among these, n-octadecyl-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate, 1,6-hexanediol-bis [3- (3 ′, 5′- t-butyl-4′-hydroxyphenyl) propionate], 3,9-bis [1,1-dimethyl-2- {β- (3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy} ethyl ] -2,4,8,10-tetraoxaspiro [5,5] undecane is preferred.

  The phosphorus compound is preferably a trivalent phosphorus compound, and in particular, at least one ester in the phosphite ester is esterified with phenol and / or phenol having at least one alkyl group having 1 to 25 carbon atoms. It is preferably at least one selected from phosphites or tetrakis (2,4-di-t-butylphenyl) -4,4′-biphenylene-diphosphonite. Specific examples of phosphites include 4,4′-butylidene-bis (3-methyl-6-tert-butylphenyl-ditridecyl) phosphite, 1,1,3-tris (2-methyl-4-ditri). Decyl phosphite-5-tert-butylphenyl) butane, trisnonylphenyl phosphite, dinonylphenyl pentaerythritol diphosphite, tris (2,4-di-tert-butylphenyl) phosphite, bis (2,4- Di-t-butylphenyl) pentaerythritol diphosphite, di (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, 2,2′-ethylidene-bis (4,6-di) -T-butylphenyl) fluorinated phosphite, 2,2'-methylene-bis (4,6-di-t-butylphenyl) octylphos Phosphite, bis (2,4-dicumylphenyl) pentaerythritol diphosphite, phosphite ester composed of monononylphenol and dinonylphenol, phosphite ester having hindered phenol represented by the above formula (6), etc. Can be mentioned. In the present invention, as the phosphorus compound, tetrakis (2,4-di-t-butylphenyl) -4,4′-biphenylene-diphosphonite, or tris (2,4-di-t-butylphenyl) phosphite, 2 2,2'-methylene-bis (4,6-di-t-butylphenyl) octyl phosphite is preferred.

  The compounding quantity of a heat stabilizer (B) is 0.0001-1.0 weight part with respect to 100 weight part of aromatic polycarbonates (A), Preferably it is 0.4 weight part or less. When the amount exceeds 1.0 part by weight, there is a problem that the hydrolysis resistance is deteriorated, and when the amount of the heat stabilizer (B) is less than 0.0001 part by weight, the effect is small, which is not preferable. The blending ratio when the heat stabilizer (B) is used in combination can be arbitrarily determined, and which is used or used in combination is appropriately determined depending on the use of the aromatic polycarbonate. For example, phosphorus compounds are generally highly effective in retention stability at high temperatures when molding aromatic polycarbonates and heat stability during use of molded products, and phenolic compounds are generally aromatic polycarbonates such as heat aging resistance. Highly effective in heat stability during use after forming a molded product. Moreover, the improvement effect of coloring property increases by using a phosphorus compound and a phenol compound together.

  A thermoplastic resin composition in which the thermal stabilizer (B) is blended with the aromatic polycarbonate (A) according to the present invention is based on JISK7210 and has the following formula:

[Equation 8]
FRR = MVR (260 / 21.6) / MVR (260 / 2.16)

(In the formula, MVR (260 / 21.6) represents a melt volume flow rate measured at 260 ° C. and a load of 21.6 kg, and MVR (260 / 2.16) is 260 ° C. The melt volume flow rate measured at a load of 2.16 kg is shown.)
It is preferable that the flow rate ratio (FRR) represented by these is 17 or less, More preferably, it is 15 or less. If the FRR is greater than 17, it is not preferable because injection molding of precision molded products becomes difficult.

  Other Additives In the thermoplastic resin composition of the present invention, at least one additive selected from the ultraviolet absorber (C) and the release agent (D) can be blended as necessary. Examples of the ultraviolet absorber (C) include organic ultraviolet absorbers such as benzotriazole compounds, benzophenone compounds, and triazine compounds in addition to inorganic ultraviolet absorbers such as titanium oxide, cerium oxide, and zinc oxide. In the present invention, among these, organic ultraviolet absorbers are preferred, and in particular, benzotriazole compounds, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy]- Phenol, 2- [4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl] -5- (octyloxy) phenol, 2,2 ′-(1,4-phenylene) It is preferably at least one selected from bis [4H-3,1-benzoxazin-4-one], [(4-methoxyphenyl) -methylene] -propanedioic acid-dimethyl ester.

  Examples of the benzotriazole compound include those represented by the following formula (7) and methyl-3- [3-t-butyl-5- (2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate-polyethylene glycol. These condensates are preferred.

(In the formula (7), R ³ ~R ⁶ represents a hydrogen atom, a halogen atom or a hydrocarbon group having 1 to 12 carbon atoms, Q ¹ and Q ² are hydrogen atom, a nitrogen atom having 1 to 40 carbon atoms And / or a hydrocarbon group that may contain an oxygen atom.)

  Specific examples of the benzotriazole compound of the formula (7) include 2-bis (5-methyl-2-hydroxyphenyl) benzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) benzo Triazole, 2- (3 ′, 5′-di-tert-butyl-2′-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5 -Chlorobenzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, 2- (3,5-di-t-amyl-2-hydroxyphenyl) benzotriazole, 2- [2- Hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, [methyl-3- [3-t-butyl-5- (2H-be Nzotriazol-2-yl) -4-hydroxyphenyl] propionate-polyethylene glycol] condensate, and a compound represented by the following formula (8).

  Among these, 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole and 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl are particularly preferable. ] -2H-benzotriazole, a compound of the above formula (5), 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, 2- [4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl] -5- (octyloxy) phenol.

  The compounding quantity of a ultraviolet absorber (C) is 5 weight part or less with respect to 100 weight part of polycarbonate, Preferably it is 1 weight part or less. If it exceeds 5 parts by weight, there is a problem of mold contamination during injection molding. The ultraviolet absorber can be used alone or in combination.

  The release agent (D) is at least one compound selected from an aliphatic carboxylic acid, an aliphatic carboxylic acid ester, an aliphatic hydrocarbon compound having a number average molecular weight of 200 to 15000, and a polysiloxane silicone oil. Among these, at least one selected from aliphatic carboxylic acids and aliphatic carboxylic acid esters is preferably used.

  Examples of the aliphatic carboxylic acid include saturated or unsaturated aliphatic monocarboxylic acid, dicarboxylic acid, and tricarboxylic acid. Here, the aliphatic carboxylic acid also includes an alicyclic carboxylic acid. Among these, preferable aliphatic carboxylic acids are mono- or dicarboxylic acids having 6 to 36 carbon atoms, and aliphatic saturated monocarboxylic acids having 6 to 36 carbon atoms are more preferable. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, valeric acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, mellic acid, and tetrariacontanoic acid. , Montanic acid, glutaric acid, adipic acid, azelaic acid and the like.

  As the aliphatic carboxylic acid component constituting the aliphatic carboxylic acid ester, the same aliphatic carboxylic acid as that described above can be used. On the other hand, examples of the alcohol component constituting the aliphatic carboxylic acid ester include saturated or unsaturated monohydric alcohols and saturated or unsaturated polyhydric alcohols. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these alcohols, monovalent or polyvalent saturated alcohols having 30 or less carbon atoms are preferable, and aliphatic saturated monohydric alcohols or polyhydric alcohols having 30 or less carbon atoms are more preferable. Here, the aliphatic alcohol also includes an alicyclic alcohol. Specific examples of these alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, dipentaerythritol. Etc. These aliphatic carboxylic acid esters may contain an aliphatic carboxylic acid and / or alcohol as impurities, and may be a mixture of a plurality of compounds. Specific examples of the aliphatic carboxylic acid ester include beeswax (mixture based on myricyl palmitate), stearyl stearate, behenyl behenate, octyldodecyl behenate, glycerin monopalmitate, glycerin monostearate, glycerin Examples thereof include distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate.

  The compounding quantity of this mold release agent (D) is 5 parts weight or less with respect to 100 weight part of polycarbonate, Preferably it is 1 part weight or less. When it exceeds 5 parts by weight, there are problems such as degradation of hydrolysis resistance and mold contamination during injection molding. The release agent can be used alone or in combination.

  In addition, in the present invention, water addition, dyes, pigments, antistatic agents, antifogging agents, organic / inorganic fillers, flame retardants, other thermoplastics, which are known techniques within a range not impairing the object of the present invention. Resin or the like can be added. These additions can be added simultaneously or separately with the heat stabilizer (B), the ultraviolet absorber (C), the release agent (D), etc. Although it may be added simultaneously with the acidic compound added for the purpose of catalyst neutralization as described above, it is preferable to add and knead other additives after the acidic compound is first added and kneaded.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated further in detail, this invention is not limited to these Examples, unless the summary is exceeded. In addition, the analysis of the aromatic polycarbonate (A) and its raw material which concern on this invention was performed with the following measuring method.

(1) Chlorine ion content in diphenyl carbonate About 5 g of diphenyl carbonate (DPC) is accurately weighed and added to 10 mL of toluene. Then, after stirring for 10 minutes at 1000 rpm using a magnetic stirrer in a constant temperature room at 23 ° C., the aqueous phase was separated, and the chlorine ions in the aqueous phase were quantified by ion chromatography. As a result of the analysis, the weight of chloride ions relative to the weight of DPC was expressed in ppb units.

(2) Viscosity average molecular weight (Mv)
From the specific viscosity (ηsp) measured at a temperature of 20 ° C. using an Ubbelohde viscometer, the aromatic polycarbonate in a concentration (C) 0.6 g / dl methylene chloride solution,

[Equation 9]
ηsp / C = [η] (1 + 0.28 ηsp)
[Η] = 1.23 × 10 ⁻⁴ Mv ^0.83

It calculated using.
(3) Crosslinked structural unit (a) Hydrolysis treatment: 1 g of aromatic polycarbonate was dissolved in 100 ml of methylene chloride, 18 ml of 28% sodium methoxide methanol solution and 80 ml of methanol were added, and 25 ml of pure water was further added. Stir at room temperature for 1 hour to complete hydrolysis. Thereafter, 1N hydrochloric acid was added, and the methylene chloride layer was separated to obtain a hydrolyzate.

(B) Liquid phase chromatography: 1 g of the hydrolyzate obtained in (a) was dissolved in 10 ml of acetonitrile and measured by reverse phase liquid chromatography. Reversed-phase liquid chromatography uses a mixed solvent consisting of acetonitrile and 10 mM ammonium acetate aqueous solution as an eluent, and starts at a ratio of acetonitrile / 10 mM ammonium acetate aqueous solution from 20/80 to a gradient of 80/20. Measured at ℃, detection uses a UV detector with a wavelength of 280 nm (manufactured by Shimadzu Corporation, trade name: SPD-6A), and quantification converts each peak area from a BPA calibration curve to a weight equivalent to BPA. It calculated | required as a weight with respect to the polymer weight before a hydrolysis. The peak was identified using LC-MS (trade name: Agilent-1100) manufactured by Agilent and NMR (trade name: AL-400) manufactured by JEOL.

(4) Number of transparent foreign matters of 10 μm or more (N: unit is pieces / g)
The aromatic polycarbonate was dried at 120 ° C. for 6 hours or more under a nitrogen atmosphere, and then a 70 μm thick film was formed using a single-screw 30 mm extruder manufactured by Isuzu Chemical Industries, Ltd. 4 g) test pieces were cut out, and using a stereomicroscope, transparent foreign matters (= fish eyes) without nuclei of each test piece were marked, and the size and number were measured at a magnification of 200 times. In the measurement, the planar boundary of the transparent foreign substance without a nucleus was determined by the difference in refractive index from the periphery, and the size thereof was the maximum distance between two points on the planar boundary line. The total number of transparent foreign matters having a size of 10 μm or more was counted, and the number of foreign matters per gram was calculated as “the number of transparent foreign matters of 10 μm or more”.
(5) Film appearance inspection The film obtained in the above (4) was visually observed and evaluated.

Example 1
Under a nitrogen gas atmosphere, bisphenol A and diphenyl carbonate were mixed at a constant molar ratio (DPC / BPA = 1.050) and heated to 140 ° C. to obtain a molten mixture. This was continuously fed into a first vertical stirring polymerization tank controlled at 220 ° C. under a normal pressure and nitrogen atmosphere through a raw material introduction tube heated to 140 ° C. The liquid level was kept constant while controlling the valve opening degree provided in the polymer discharge line at the bottom of the tank so that the average residence time was 60 minutes. At the same time as the supply of the raw material mixture was started, an aqueous cesium carbonate solution as a catalyst was continuously supplied at a ratio of 0.60 μmol with respect to 1 mol of bisphenol A.

  The polymerization liquid discharged from the tank bottom was continuously continuously supplied to the second, third and fourth vertical stirring polymerization tanks and the fifth horizontal stirring polymerization tank. During the reaction, the liquid level was controlled so that the average residence time in each tank was 60 minutes, and at the same time, the by-produced phenol was distilled off. The polymerization conditions of the second to fifth polymerization tanks are the second polymerization tank (220 ° C., 13332 Pa), the third polymerization tank (240 ° C., 2000 Pa), the fourth polymerization tank (270 ° C., 67 Pa), and the fifth polymerization tank, respectively. The conditions were set to high temperature, high vacuum, and low stirring speed as the reaction proceeded (285 ° C., 27 Pa). The production rate of the aromatic polycarbonate is 50 kg / Hr. The viscosity average molecular weight of the aromatic polycarbonate thus obtained and the number of transparent foreign matters having a size of 10 μm or more and the content of the crosslinked structure were measured and shown in Table 1. Table 1 collectively shows the mixing ratio of the above bisphenol A and diphenyl carbonate, the temperature, pressure, residence time, catalyst concentration, etc. of each polymerization tank.

  Next, the aromatic polycarbonate obtained from the fifth polymerization tank was introduced into a twin-screw extruder (L / D = 42, barrel temperature 240 ° C.) with a gear pump while being in a molten state, and p from the first supply port. -7 ppm of butyltoluenesulfonate was added, and the heat stabilizer shown in Table 1 was further added from the second supply port, and then pelletized through a leaf disk polymer filter. This polymer filter is a woven wire mesh leaf disk with an absolute filtration accuracy of 10 μm attached to the center post. Before polymer melt flow, the flow rate is 5 ml / min for 36 hours at 280 ° C. in a nitrogen atmosphere. The temperature was raised and used. Table 2 shows the results of evaluating the obtained thermoplastic resin composition pellets by the following method.

(6) Flow rate ratio (FRR)
Using a melt indexer manufactured by Takara Industries Co., Ltd., a melt flow volume MVR (260 / 21.6) per unit time measured on a thermoplastic resin composition pellet at 260 ° C. under a load of 21.6 kg; Using the melt flow volume MVR (260 / 2.16) per unit time measured at 0 ° C. and a load of 2.16 kg, the flow rate ratio (FRR) was determined by the following equation.

[Equation 10]
FRR = MVR (260 / 21.6) / MVR (260 / 2.16)

(7) After drying the initial hue thermoplastic resin composition pellets at 120 ° C. for 4 hours, a 3 mm thick molded product is obtained at 320 ° C. using an injection molding machine (trade name: M150A-IISJ) manufactured by Meiki Seisakusho Co., Ltd. The YI value was measured with a spectroscopic colorimeter (manufactured by Nippon Denshoku Industries Co., Ltd., trade name: SE2000) under the conditions of a molding cycle of 1 minute. It shows that it colors, so that this YI value is large.
(8) 320 ° C. heat resistance test After the thermoplastic resin composition pellets are dried at 120 ° C. for 4 hours, a 3 mm-thick molded product is obtained using an injection molding machine (trade name: M150AII-SJ) manufactured by Meiki Seisakusho Co., Ltd. Injection molding was performed under the conditions of 320 ° C. and a molding cycle of 10 minutes, and YI was measured by a transmission method using a spectrocolorimeter (trade name: SE2000) manufactured by Nippon Denshoku Industries Co., Ltd. Further, the burnt dust was visually observed and evaluated in the following three stages.
○ No burnt garbage △ Some burnt garbage x Lots of burnt garbage

(9) Elongation at break, impact strength After drying thermoplastic resin composition pellets at 120 ° C. for 4 hours, 320 ° C., molding cycle using an injection molding machine (trade name: M150AII-SJ) manufactured by Meiki Seisakusho Co., Ltd. A 1.6 mm thick L type tensile impact test piece according to ASTM D1822 and a 3.2 mm thickness type 1 tensile test specimen according to ASTM D638 were molded under conditions of 1 minute, and impact strength and elongation at break were measured.
(10) The fish-eye thermoplastic resin composition pellets of the sheet are melt-kneaded by a vented extruder with a screw diameter of 65 mm set at a temperature of 280 ° C., and passed through a T die having a width of 600 mm set at 275 ° C., and the surface temperature is The sheet was cooled while being sandwiched between two polishing rolls set at 130 ° C., a sheet having a thickness of 0.5 mm was extruded, and fish eyes were visually observed to evaluate the following three stages.
○: No fisheye △: Little fisheye ×: Many fisheye (11) Weather resistance test The molded piece whose initial hue was measured in (7) above was subjected to a black panel temperature of 63 ° C using a xenon weather meter. And YI after the treatment was measured for 600 hours.

Examples 2-3
Bisphenol A and diphenyl carbonate are mixed at a molar ratio shown in Table 1, and the temperature, pressure, residence time, type and concentration of catalyst, type and amount of heat stabilizer to be added are as shown in Table 1. The same operation as in Example 1 was performed except that this was performed. The evaluation results of the obtained thermoplastic resin composition pellets are shown in Table 2. However, in Example 3, in the evaluation of the fish eye of the sheet, the setting temperature at the time of melt kneading was 295 ° C., and the setting temperature of the T die was 285 ° C.
Comparative Example 1 The same operation as in Example 2 was performed except that the heat stabilizer was not added. The evaluation results of the obtained thermoplastic resin composition pellets are shown in Table 2.

Comparative Examples 2-3
Bisphenol A and diphenyl carbonate were mixed at a molar ratio shown in Table 1, and the same operation as in Example 1 was carried out except that the temperature, pressure, residence time, catalyst type and concentration in each polymerization tank were carried out under the conditions shown in Table 1. Went. The evaluation results of the obtained thermoplastic resin composition pellets are shown in Table 2.

In addition, the thermal stabilizers 1-4 used as the thermal stabilizer A and B in Table 1 represent the following, respectively.
[Thermal stabilizer A (hindered phenol compound)]
Heat stabilizer 1: n-octadecyl-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate (trade name: IRGANOX 1076, manufactured by Ciba Specialty Chemicals)
Thermal stabilizer 2: Pentaerythrityl-tetrakis [3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate] (trade name: IRGANOX 1010, manufactured by Ciba Specialty Chemicals)
[Thermal stabilizer B (phosphorus compound)]
Thermal stabilizer 3: Tris (2,4-di-t-butylphenyl) phosphite (trade name: ADK STAB 2112, manufactured by Asahi Denka Co., Ltd.)
Thermal stabilizer 4: 2,2′-methylene-bis (4,6-di-t-butylphenyl) octyl phosphite (trade name: HP10, manufactured by Asahi Denka Co., Ltd.)

Examples 4-6
The same operation as in Example 1 was performed except that an ultraviolet absorber was further added to the compositions of Examples 1 to 3 from the second supply port of the twin screw extruder according to Table 3. The evaluation results of the obtained thermoplastic resin composition pellets are shown in Table 3. However, in Example 6, in the evaluation of the fish eye of the sheet, the set temperature during melt kneading was 295 ° C., and the set temperature of the T die was 285 ° C.
Comparative Examples 4-6 The same operation as Comparative Examples 1 to 3 was performed except that an ultraviolet absorber was further added from the second supply port of the twin screw extruder according to Table 3 to the compositions of Comparative Examples 1 to 3. went. The evaluation results of the obtained thermoplastic resin composition pellets are shown in Table 3.

In Table 3, UV1 to UV3 used as ultraviolet absorbers represent the following, respectively.
UV1: 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole (trade name: Seasorb 709, manufactured by Cypro Kasei Co., Ltd.)
UV2: 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole (trade name: TINUVIN234, manufactured by Ciba Specialty Chemicals)
UV3: [(4-methoxyphenyl) -methylene] -propanedioic acid-dimethyl ester (trade name: SanduvorPR25, manufactured by Clariant)

Examples 7-9
The same operation as in Example 1 was performed except that a release agent was further added to the compositions of Examples 1 to 3 from the second supply port of the twin screw extruder according to Table 4. Table 4 shows the evaluation results of the obtained thermoplastic resin composition pellets. However, in Example 9, in the evaluation of the fish eye of the sheet, the set temperature during melt kneading was 295 ° C., and the set temperature of the T die was 285 ° C.
Comparative Examples 7 to 9 The same operations as in Comparative Examples 1 to 3 were performed except that a release agent was further added from the second supply port of the twin screw extruder according to Table 4 to the compositions of Comparative Examples 1 to 3. went. Table 4 shows the evaluation results of the obtained thermoplastic resin composition pellets.

In Table 4, release agents 1 to 5 used as release agents represent the following, respectively.
Mold release agent 1: Glycerol monostearate (trade name: Ricamar S-100A, manufactured by Riken Vitamin Co., Ltd.)
Mold release agent 2: Pentaerythritol tetrastearate (trade name: Unistar H-476, manufactured by NOF Corporation)
Release agent 3: Beeswax (trade name: Golden brand, manufactured by Miki Chemical Industry Co., Ltd.)
Release agent 4: Pentaerythritol distearate (trade name: UNISTAR H-476D, manufactured by NOF Corporation) Release agent 5: stearic acid (tradename: UNISTA NAA180, manufactured by NOF Corporation)

That is, the gist of the present invention is an aromatic polycarbonate having a viscosity average molecular weight (Mv) obtained by melt polymerization of an aromatic dihydroxy compound and a carbonic acid diester compound of 15,000 to 40,000 and a total content of crosslinked structural units of 2500 ppm or less (A ) A thermoplastic resin composition in which 0.0001 to 1.0 part by weight of the heat stabilizer (B) is blended with 100 parts by weight, and further, an ultraviolet absorber (C) and a release agent (D) are blended as necessary. It is in providing a thing and its manufacturing method.

Claims (7)

In an aromatic polycarbonate obtained by melt polymerization of an aromatic dihydroxy compound and a carbonic acid diester compound, the number of transparent foreign matters (N: units / g) of 10 μm or more and the viscosity average molecular weight (Mv) are the following (1) or ( 2):
[Equation 1]
In the case of Mv ≦ 21000, N ≦ exp (6.824 × 10 ⁻⁴ × Mv−8.626) (1)
In the case of Mv> 21000, N ≦ exp (8.514 × 10 ⁻⁵ × Mv + 3.916) (2)
The thermoplastic resin composition which mix | blended 0.0001-1.0 weight part of heat stabilizers (B) with respect to 100 weight part of aromatic polycarbonate (A) which satisfies the relational expression represented by these. The thermoplastic resin composition according to claim 1, wherein a flow rate ratio (FRR) represented by the following formula is 17 or less in accordance with JISK7210.
[Equation 2]
FRR = MVR (260 / 21.6) / MVR (260 / 2.16)   The thermoplastic resin composition according to claim 1 or 2, wherein an aromatic polycarbonate (A) having a total content of crosslinked structural units of 2500 ppm or less is used.   The thermoplastic resin composition according to any one of claims 1 to 3, wherein the heat stabilizer (B) is at least one compound selected from a hindered phenol compound and a phosphorus compound.   The thermoplastic resin composition according to any one of claims 1 to 4, comprising at least one additive selected from an ultraviolet absorber (C) and a release agent (D).   The ultraviolet absorber (C) is a benzotriazole compound, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, 2- [4, 6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl] -5- (octyloxy) phenol, 2,2 ′-(1,4-phenylene) bis [4H-3, The heat according to claim 5, which is at least one compound selected from 1-benzoxazin-4-one], [(4-methoxyphenyl) -methylene] -propanedioic acid-dimethyl ester. Plastic resin composition. The thermoplastic resin composition according to claim 5, wherein the release agent (D) is at least one compound selected from an aliphatic carboxylic acid and an aliphatic carboxylic acid ester.