JP2003327818A - Polycarbonate resin composition and molded article made thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polycarbonate resin composition giving a molded article having excellent transparency, molding heat-resistance and mold releasability and remarkably decreased strain in the molded article. <P>SOLUTION: The resin composition is composed of 100 pts.wt. of a polycarbonate resin (component A) and 0.005-2 pts.wt. of a full ester of a polyhydric alcohol and an aliphatic carboxylic acid (component B). The aliphatic carboxylic acid contains a palmitic acid component and a stearic acid component, the sum of the area of the palmitic acid component (Sp) and the area of the stearic acid component (Ss) is ≥80% of the total area of the aliphatic carboxylic acid component in terms of the peak area measured by gas chromatography- mass spectrometry (GC/MS) and the ratio of the areas (Ss/Sp) is ≥1.2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polycarbonate resin composition. More specifically, a polycarbonate resin composition which is excellent in mold releasability and has a greatly improved internal strain of the molded article without lowering the transparency of the molded article made of the resin composition and the molding heat resistance of the resin composition. Regarding things.

[0002]

2. Description of the Related Art Polycarbonate resins are widely used in electrical, mechanical, automobile, medical and other applications because they have excellent transparency, heat resistance and mechanical strength. However, the polycarbonate resin has a large mold release resistance at the time of molding and may cause problems such as deterioration of the appearance of the molded product such as damage to the molded product at the time of mold release and residual mold release strain. In such a case, a method of adding a release agent to the resin is widely used.

On the other hand, in recent years, polycarbonate resins have been widely used for various transparent members due to the above various excellent characteristics. Above all, application to transparent members for vehicles has been widely tried for the purpose of weight reduction. Examples of such a transparent member for vehicle include a head lamp lens, a resin window glass, a rear lamp lens, and a meter cover. These members are characterized in that their shapes are complicated and large, and that the demands on the quality of molded products are extremely high. When the shape of the molded product becomes complicated, the flow of the molten resin at the time of injection molding becomes complicated, so that distortion is likely to occur inside the molded product. Also, as the size of the molded product increases, the molding cycle tends to become longer, and the heat load tends to become relatively large. In this respect, the manufacture of transparent members for vehicles, especially large-sized members, is different from the manufacture of optical disk substrates, which are typical optical molded products of polycarbonate resin. Manufacturing of an optical disk substrate is molding that requires an extremely high processing temperature, while molding of an extremely short molding cycle.

Conventionally, a method of blending a fatty acid ester is widely known as a method for improving the releasability of a polycarbonate resin, and glycerin monostearate is often used among them. However, the polycarbonate resin composition containing glycerin monostearate is excellent in mold releasability, but on the other hand, in the field where extremely high quality is required for the molded product as described above, distortion (normally a polarizing plate) generated in the molded product is generated. Can be observed by observing the above) is not preferable, and its improvement may be required.

As a releasing agent used for a polycarbonate resin, a full ester of a polyhydric alcohol and an aliphatic carboxylic acid such as pentaerythritol tetrastearate is also widely known. Various proposals have been made for the purpose of further improving the quality of the polycarbonate resin composition to which the full ester is added. The full ester of polyhydric alcohol and aliphatic carboxylic acid may be simply referred to as "fatty acid full ester" hereinafter.

Japanese Unexamined Patent Publication No. 2-69556 discloses a polycarbonate resin composition containing an ester of pentaerythritol in which the OH group content and the acid value of the ester compound are extremely reduced. However, the main object of the invention described in this publication is to reduce the ductile-brittle transition temperature of the resin composition (that is, the ductility temperature range increases). Further, JP 2001-192543 A proposes reduction of impurities in a release agent such as fatty acid full ester. However, this publication also fails to disclose sufficient technical knowledge regarding the further improvement of the releasing force of the fatty acid full ester (reduction of releasing force) and the reduction of the strain generated inside the molded article.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polycarbonate resin composition which is excellent in transparency, heat resistance of molding, and releasability of a molded product and in which distortion inside the molded product is significantly improved. To do.

As a result of intensive studies conducted by the present inventors in order to achieve the above object, a resin composition obtained by adding a specific fatty acid full ester to a polycarbonate resin has a decrease in transparency and molding heat resistance inherent in the polycarbonate resin. The present invention has been completed by discovering that it has a greatly improved releasability and that it has a significantly reduced internal strain of a molded article without causing the above-mentioned problem.

[0009]

That is, according to the present invention, 100 parts by weight of a polycarbonate resin (component A) and 0.005 to 2 parts by weight of a full ester of a polyhydric alcohol and an aliphatic carboxylic acid (component B). Part of the resin composition, wherein the aliphatic carboxylic acid contains a palmitic acid component and a stearic acid component, and the peak area in the gas chromatograph-mass spectrometry (GC / MS method) thereof is the area of the palmitic acid component. (Sp) and the area (Ss) of the stearic acid component are 80% or more in the total aliphatic carboxylic acid component, and the area ratio (Ss / Sp) of both is 1.2 or more. A polycarbonate resin composition is provided.

According to a preferred aspect of the present invention, the above B
The above-mentioned polycarbonate resin composition in which the polyhydric alcohol as a component is pentaerythritol is provided. According to a preferred aspect of the present invention, the above area ratio (Ss / Sp)
The above polycarbonate resin composition is 1.3 to 30.

According to a preferred aspect of the present invention, there is provided a molded product made of the above polycarbonate resin composition, and more preferably such a molded product which is a transparent member for vehicles.

The details of the present invention will be further described below.

The polycarbonate resin used as the component A in the present invention is obtained by reacting a dihydric phenol with a carbonate precursor. Examples of the reaction method include an interfacial polymerization method, a melt transesterification method, a solid-state transesterification method of a carbonate prepolymer, and a ring-opening polymerization method of a cyclic carbonate compound.

Typical examples of the dihydric phenol used here include hydroquinone, resorcinol, 4,
4'-biphenol, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane (commonly called bisphenol A), 2,2-bis (4-hydroxy-3-methylphenyl) )propane,
2,2-bis (4-hydroxyphenyl) butane, 1,
1-bis (4-hydroxyphenyl) -1-phenylethane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl)-
3,3,5-trimethylcyclohexane, 2,2-bis (4-hydroxyphenyl) pentane, 4,4 '-(p
-Phenylenediisopropylidene) diphenol, 4,
4 '-(m-phenylenediisopropylidene) diphenol, 1,1-bis (4-hydroxyphenyl) -4-
Isopropylcyclohexane, bis (4-hydroxyphenyl) oxide, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfoxide, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) ketone, bis ( 4-hydroxyphenyl) ester, 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane, bis (3,3
5-dibromo-4-hydroxyphenyl) sulfone, bis (4-hydroxy-3-methylphenyl) sulfide, 9,9-bis (4-hydroxyphenyl) fluorene and 9,9-bis (4-hydroxy-3-methyl) Phenyl) fluorene and the like. A preferable dihydric phenol is bis (4-hydroxyphenyl) alkane, and bisphenol A is particularly preferable from the viewpoint of impact resistance.

Carbonyl halide, carbonic acid diester or haloformate is used as the carbonate precursor, and specific examples thereof include phosgene, diphenyl carbonate or dihaloformate of dihydric phenol.

In the production of a polycarbonate resin by the interfacial polymerization method of the above dihydric phenol and carbonate precursor, a catalyst, a terminal terminator, and an antioxidant for preventing the dihydric phenol from being oxidized, if necessary. Agents and the like may be used. Further, the polycarbonate resin may be a branched polycarbonate resin obtained by copolymerizing a trifunctional or higher polyfunctional aromatic compound, or a polyester carbonate resin obtained by copolymerizing an aromatic or aliphatic difunctional carboxylic acid, It may also be a mixture of two or more of the obtained polycarbonate resins.

Examples of trifunctional or higher polyfunctional aromatic compounds include 1,1,1-tris (4-hydroxyphenyl) ethane and 1,1,1-tris (3,5-dimethyl-4-hydroxyphenyl). You can use ethane.

When a polyfunctional compound which gives a branched polycarbonate is contained, such a proportion is 0.001 to 1 mol%, preferably 0.001 of the total amount of the aromatic polycarbonate.
It is 5 to 0.5 mol%, particularly preferably 0.01 to 0.3 mol%. Further, particularly in the case of the melt transesterification method, a branched structure may occur as a side reaction, and the amount of the branched structure is 0.
001 to 1 mol%, preferably 0.005 to 0.5 mol%, particularly preferably 0.01 to 0.3 mol%. The ratio can be calculated by ¹ H-NMR measurement.

Aliphatic difunctional carboxylic acids include α, ω
-Dicarboxylic acids are preferred. Preferred examples of the aliphatic difunctional carboxylic acid include linear saturated aliphatic dicarboxylic acids such as sebacic acid (decanedioic acid), dodecanedioic acid, tetradecanedioic acid, octadecanedioic acid, and icosanedioic acid.

Further, it is also possible to use a polycarbonate-polyorganosiloxane copolymer obtained by copolymerizing a polyorganosiloxane unit.

The reaction by the interfacial polymerization method is usually a reaction between a dihydric phenol and phosgene, which is carried out in the presence of an acid binder and an organic solvent. As the acid binder, for example, an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide, pyridine or the like is used.

As the organic solvent, for example, halogenated hydrocarbon such as methylene chloride or chlorobenzene is used.

A catalyst such as a tertiary amine or a quaternary ammonium salt may be used to accelerate the reaction. As a molecular weight regulator, for example, phenol or p-ter is used.
It is preferable to use monofunctional phenols such as t-butylphenol and p-cumylphenol. Further, examples of monofunctional phenols include decylphenol, dodecylphenol, tetradecylphenol, hexadecylphenol, octadecylphenol, eicosylphenol, docosylphenol and triacontylphenol. These monofunctional phenols having a relatively long chain alkyl group are effective when improvement in fluidity and hydrolysis resistance is required.

It is preferable that the reaction temperature is usually 0 to 40 ° C., the reaction time is several minutes to 5 hours, and the pH during the reaction is usually 10 or more.

The reaction by the melting method is usually a transesterification reaction between a dihydric phenol and a carbonic acid diester. The dihydric phenol and a carbonic acid diester are mixed in the presence of an inert gas, and the reaction is usually conducted at 120 to 350 ° C. under reduced pressure. Let The degree of pressure reduction is changed stepwise, and finally the phenols produced at 133 Pa or less are removed to the outside of the system. The reaction time is usually about 1 to 4 hours.

Examples of the carbonic acid diester include diphenyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate, dimethyl carbonate, diethyl carbonate and dibutyl carbonate, among which diphenyl carbonate is preferred.

A polymerization catalyst can be used to accelerate the polymerization rate. Examples of the polymerization catalyst include hydroxides of alkali metals and alkaline earth metals such as sodium hydroxide and potassium hydroxide, and waters of boron and aluminum. Oxide,
Alkali metal salts, alkaline earth metal salts, quaternary ammonium salts, alkali metal and alkaline earth metal alkoxides, organic acid salts of alkali metals and alkaline earth metals, zinc compounds, boron compounds, silicon compounds, germanium compounds, Examples of the catalyst used in the ordinary esterification reaction or transesterification reaction include organic tin compounds, lead compounds, antimony compounds, manganese compounds, titanium compounds and zirconium compounds. The catalyst may be used alone or in combination of two or more kinds. The amount of these polymerization catalysts used is preferably 1 × 10 ⁻⁸ to 1 × 10 ⁻³ equivalent, and more preferably 1 equivalent to 1 mol of the dihydric phenol as a raw material.
It is selected in the range of × 10 ^{-7 to} 5 × 10 ^-4 equivalents.

In the polymerization reaction, in order to reduce the number of phenolic terminal groups, for example, 2-chlorophenylphenyl carbonate, 2-methoxycarbonylphenylphenyl carbonate and 2-ethoxycarbonylphenylphenyl may be used in the latter stage or after the termination of the polycondensation reaction. Compounds such as carbonates can be added.

Further, in the melt transesterification method, it is preferable to use a deactivator which neutralizes the activity of the catalyst. The amount of the deactivator is 0.5 to 1 mol of the remaining catalyst.
It is preferably used in a proportion of 50 mol. In addition, 0.01 to 500 ppm relative to the aromatic polycarbonate after polymerization
Is used, more preferably 0.01 to 300 ppm, and particularly preferably 0.01 to 100 ppm.
Preferable examples of the quenching agent include phosphonium salts such as tetrabutylphosphonium dodecylbenzene sulfonate and ammonium salts such as tetraethylammonium dodecylbenzyl sulfate.

Details of reaction modes other than the above are well known in the books and patent publications.

The molecular weight of the polycarbonate resin is 10,
000-100,000 is preferable, 12,000-4
5,000 is more preferable, and 15,000 to 40,000.
0 is more preferable, and 21,000 to 30,000 is particularly preferable. When a polycarbonate resin having such a viscosity average molecular weight is used, the resin composition of the present invention has sufficient strength and good melt flowability during molding. Such good melt flowability is preferable because molding distortion can be further reduced. The polycarbonate resin may be obtained by mixing those having a viscosity average molecular weight outside the above range.

The viscosity average molecular weight (M) of the polycarbonate resin is obtained by inserting the specific viscosity (η _sp ) obtained at 20 ° C. from a solution prepared by dissolving 0.7 g of the polycarbonate resin in 100 ml of methylene chloride into the following equation. . η _sp /c=[η]+0.45×[η] ² c (however, [η]
Is the intrinsic viscosity) [η] = 1.23 × 10 ⁻⁴ M ^0.83 c = 0.7

The component B used in the present invention is a full ester of a polyhydric alcohol and an aliphatic carboxylic acid (fatty acid full ester), and the aliphatic carboxylic acid contains a palmitic acid component and a stearic acid component. In the peak area in the gas chromatograph-mass spectrometry (GC / MS method), the sum of the area of the palmitic acid component (Sp) and the area of the stearic acid component (Ss) is 80% or more in the total aliphatic carboxylic acid component. Yes, and the area ratio of both (Ss / S
p) is 1.2 or more.

The full ester in the present invention does not necessarily have an esterification rate of 100%, and may be 80% or more, preferably 85% or more.

The GC / MS method in the present invention uses a pyrolysis methylation method. That is, a fatty acid full ester as a sample is reacted with methylammonium hydroxide as a reaction reagent on a pyrofil to decompose the fatty acid full ester and generate a methyl ester derivative of a fatty acid, and a GC / MS measurement is performed on the derivative. It is a thing. From such measurement, the total ratio of Ss and Sp in the total aliphatic carboxylic acid component and their area ratio (Ss / Sp) are calculated. Therefore, the peak area of each component is based on each methyl ester derivative.

The above area ratio (Ss / Sp) is 1.3 to
The range of 30 is more preferable. Further, the upper limit is more preferably 10, still more preferably 4, still more preferably 2.

In the composition of the present invention, the fatty acid full ester contained contains the palmitic acid component and the stearic acid component in the specific ratios as described above. The form may be any form as long as the conditions are satisfied, and examples thereof include the following forms.

Aspect (i): the above area ratio (Ss / Sp)
Resin composition embodiment (ii) in which one type of fatty acid full ester satisfying the above condition is blended in a polycarbonate resin: Two or more types of fatty acid full ester are polycarbonate resin so as to satisfy the above area ratio (Ss / Sp) Resin composition formed in

The production of the fatty acid full ester of the present invention is not particularly limited, and the polyhydric alcohol and the aliphatic carboxylic acid can be prepared by various conventionally known methods. Examples of the reaction catalyst include sodium hydroxide, potassium hydroxide, barium hydroxide, calcium hydroxide, calcium oxide, barium oxide, magnesium oxide, zinc oxide, sodium carbonate, potassium carbonate, and organotin compounds such as 2-ethylhexyltin. Is mentioned.

Examples of the production method of the fatty acid full ester satisfying the above area ratio (Ss / Sp) of the invention include the following.

Aspect (1): Stearic acid having a purity of about 100% is reacted with a polyhydric alcohol to obtain a full ester. Similarly, palmitic acid and polyhydric alcohol are reacted to obtain a full ester. In the composition of the present invention as described in the above aspect (ii), the above area ratio (Ss / S
It is blended with a polycarbonate resin so as to satisfy the condition of p).

Embodiment (2): A full ester is obtained by reacting an aliphatic carboxylic acid containing both stearic acid and palmitic acid with a polyhydric alcohol. Two or more of these are combined as in the above aspect (ii) and blended in the polycarbonate resin in the composition so that the above area ratio (Ss / Sp) conditions are satisfied.

Aspect (3): The above area ratio (Ss / Sp)
The aliphatic carboxylic acid containing stearic acid and palmitic acid is reacted with a polyhydric alcohol at a composition ratio satisfying the condition (1) to obtain a full ester. The resin composition of the present invention is obtained by blending the full ester with a polycarbonate resin.

Among the above, the aspect (3) is particularly preferable.
Is. This is because such a mode is simple in the production of the composition and is highly uniform because it is produced as an integral compound.

The aliphatic carboxylic acid used in the above aspect (3) will be described. As well known, aliphatic carboxylic acids such as stearic acid and palmitic acid are usually produced from various vegetable oils and animal oils. Since these oils and fats are ester compounds containing various aliphatic carboxylic acids as their components, the stearic acid produced usually contains a large amount of other aliphatic carboxylic acid components such as palmitic acid. Therefore, in order to produce the aliphatic carboxylic acid used in the aspect (3) of the present invention, stearic acid and palmitic acid are added to the above area ratio (Ss /
It is necessary to use an aliphatic carboxylic acid that satisfies the condition of Sp), and it is appropriate to use an oil or fat suitable for the condition as a raw material of the aliphatic carboxylic acid. It is possible to mix two or more kinds of the above-mentioned aliphatic carboxylic acids so as to have a predetermined composition condition, but it is more preferable to satisfy the predetermined composition condition from one kind of raw material.

Palm oil is widely used as an oil and fat as a raw material for the aliphatic carboxylic acid because of its production cost advantage. However, in the present invention, it cannot be said that it is appropriate to use such an aliphatic carboxylic acid derived from palm oil in the above aspect (3). Examples of fats and oils as raw materials for the aliphatic carboxylic acid include animal fats and oils such as beef tallow and lard, as well as linseed oil, safflower oil, sunflower oil, soybean oil, corn oil, peanut oil, cottonseed oil, sesame oil, olive oil, etc. Vegetable oils and fats can be mentioned. Among the above, animal fats and oils are preferable, and beef tallow is more preferable, because they contain more stearic acid. Further, among beef tallow, oleostearine containing a large amount of saturated components such as stearic acid and palmitic acid is preferable.

On the other hand, the polyhydric alcohol used as the component B is more preferably one having 3 to 32 carbon atoms. Specific examples of the polyhydric alcohol include glycerin, diglycerin, polyglycerin (for example, decaglycerin, etc.), pentaerythritol, dipentaerythritol, diethylene glycol, propylene glycol and the like, among which pentaerythritol is preferable.

The acid value, hydroxyl value, iodine value, and 5% weight loss temperature in TGA (thermogravimetric analysis) measurement of the component B fatty acid full ester of the present invention will be described.

In the component B of the present invention, the acid value is preferably low from the viewpoint of thermal stability, while it is preferably relatively high from the viewpoint of reducing the releasing force (improving the releasing property). B
The acid value of the component is suitably in the range of 0.1 to 20,
The range of 8 is more preferable, and the range of 5 to 15 is further preferable. Here, the acid value is the mg number of potassium hydroxide required to neutralize free fatty acids and the like contained in 1 g of the sample, and can be determined by the method specified in JIS K 0070. Although the relationship between the acid value and the reduction of the releasing force is not clear in the above, it is considered that the unreacted free carboxylic acid is likely to migrate to the surface during molding.

In the component B of the present invention, the hydroxyl value is preferably low from the viewpoints of thermal stability and reduction of the releasing force. On the other hand, too low value is not preferable because the production time increases and the cost increases. The hydroxyl group content of the B component is 0.
The range of 1-40 is suitable, the range of 1-30 is preferable, and the range of 2-20 is more preferable. Here, the hydroxyl value is the number of mg of potassium hydroxide required to neutralize the acetic acid bound to the hydroxyl group when 1 g of the sample is acetylated, and can be determined by the method specified in JIS K 0070. .

In the component B of the present invention, the iodine value is preferably low from the viewpoint of thermal stability. The iodine value of the component B is preferably 10 or less, more preferably 1 or less. The iodine value is an amount obtained by converting the amount of halogen bound when 100 g of a sample is reacted with halogen into the number of g of iodine, and can be determined by the method defined in JIS K 0070.

In the component B of the present invention, the 5% weight loss temperature in TGA (thermogravimetric analysis) measurement is preferably moderately low from the viewpoint of reducing the releasing force (improving the releasing property), and the thermal stability From the point of view, it is preferable that it is high. The 5% weight loss temperature of the component B is appropriately in the range of 250 to 400 ° C, preferably 280 to 360 ° C, and preferably 300 to
The range of 350 ° C. is more preferable, and the range of 310 to 340 ° C. is further preferable. The 5% weight loss temperature is TGA
It is determined by the measurement conditions under which the temperature is raised from 23 ° C. in a nitrogen gas atmosphere to 600 ° C. at a heating rate of 20 ° C./min. Although the relationship between the 5% weight reduction temperature and the reduction of the releasing force is not clear in the above,
It is thought that the reason why the weight reduction temperature is in the above range is that an unreacted free carboxylic acid and other highly volatile components are contained in an appropriate amount, and such components easily migrate to the surface during molding.

The polyester of polyhydric fatty acid used in the present invention is preferably 0.005 to 2 parts by weight, more preferably 0.002 parts by weight, based on 100 parts by weight of the polycarbonate resin.
It is from 01 to 1 part by weight. 0.00 of polyvalent fatty acid ester
If it is less than 5 parts by weight, the releasability is not sufficiently improved, and if it is used in excess of 2 parts by weight, the transparency of the molded product may be impaired and the molding heat resistance is also lowered.

The reason why the polycarbonate resin composition containing the specific fatty acid full ester of the present invention has good mold releasability and reduced internal strain of the molded article is not clear, but it is considered as follows. That is, it is considered that the sliding effect in the polycarbonate resin is improved by satisfying the specific ratio of stearic acid and palmitic acid. The improvement of the sliding effect also has the effect of improving the releasability. Further, it is considered that the slip effect makes the resin flow smooth even in a complicated resin flow, improves the irregular flow behavior, and reduces the distortion inside the molded product. On the other hand, the specific ratio of stearic acid to palmitic acid has good thermal stability, so that the effect is sufficiently satisfied even at the time of molding at high temperature, and the compatibility with the polycarbonate resin is also good. It is believed that it will exhibit excellent transparency.

Further, the polycarbonate resin composition of the present invention has an effect of reducing a trace amount of carbides generated in the molded product. Since such a carbide scatters light depending on the intensity of the light source and the angle of light, it may be observed as a white band in the molded product. Also in this respect, the polycarbonate resin composition of the present invention has suitable properties.

In the polycarbonate resin composition of the present invention, a phosphorus-based heat stabilizer or a hindered phenol-based stabilizer can be used in order to prevent a decrease in molecular weight and deterioration of hue during molding. Examples of such phosphorus-based heat stabilizers include phosphorous acid, phosphoric acid, phosphonous acid, phosphonic acid and esters thereof.

Specific examples of such ester include the following. Examples of the phosphite compound include triphenyl phosphite, tris (nonylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl monophenyl. Phosphite, monobutyldiphenylphosphite, monodecyldiphenylphosphite, monooctyldiphenylphosphite, tris (2,4-di-tert-butylphenyl)
Phosphite, bis (2,6-di-tert-butyl-
4-Methylphenyl) pentaerythritol diphosphite, 2,2-methylenebis (4,6-di-tert-
Examples include butylphenyl) octylphosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, and distearyl pentaerythritol diphosphite.

Examples of the phosphate compound include tributyl phosphate, triethyl phosphate, trimethyl phosphate, triphenyl phosphate, diphenylmonoorthoxenyl phosphate, dibutyl phosphate, dioctyl phosphate, diisopropyl phosphate and the like.

The phosphonite compound is tetrakis (2,4-di-iso-propylphenyl) -4,4 '.
-Biphenylene diphosphonite, 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'-biphenylene diphosphonite, 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 '
-Biphenylene diphosphonite, and bis (2,4-
Di-tert-butylphenyl) -phenyl-phenylphosphonite and the like.

Examples of the phosphonate compound include dimethyl benzenephosphonate, diethyl benzenephosphonate, and dipropyl benzenephosphonate.

Among them, tris (2,4-di-tert-
Butylphenyl) phosphite, tetrakis (2,4-
Di-tert-butylphenyl) -4,4′-biphenylenediphosphonite and bis (2,4-di-tert)
-Butylphenyl) -phenyl-phenylphosphonite is preferred.

As the hindered phenol stabilizer, for example, octadecyl-3- (3,5-di-ter) is used.
t-Butyl-4-hydroxyphenyl) propionate, pentaerythrityl tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 2,6-di-tert-butyl-p-cresol , 4,4′-butylidene bis- (6-tert-
Butyl-3-methylphenol, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) methane, 2,2-thiodiethylenebis- [3
-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,3
5-di-tert-butyl-4-hydroxyphenyl)
Propionate, N, N'-hexamethylenebis-
(3,5-di-tert-butyl-4-hydrocinnamide), 3,5-di-tert-butyl-4-hydroxy-benzylphosphonate-diethyl ester, 1,3,3.
5-trimethyl-2,4,6-tris (3,5-di-t
ert-butyl-4-hydroxybenzyl) benzene,
1,6-hexanediol bis [3- (3,5-di-t
ert-Butyl-4-hydroxyphenyl) propionate], tris (3,5-di-tert-butyl-4-)
Hydroxybenzyl) isocyanurate, and 2,4
-Bis (n-octylthio-6- (4-hydroxy-
3,5-di-tert-butylanilino) -1,3,5
-Triazine and the like.

These heat stabilizers may be used alone or in combination of two or more. The amount of the heat stabilizer used is 0.0 with respect to 100 parts by weight of the polycarbonate resin.
01 to 0.2 parts by weight is preferable.

An ultraviolet absorber can be used in the polycarbonate resin composition of the present invention. The ultraviolet absorbent compound is specifically 2,4 in the benzophenone type.
-Dihydroxybenzophenone, 2-hydroxy-4-
Methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2-hydroxy-4-methoxy-5
-Sulfoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfoxytrihydride benzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2 ', 4,4'-tetrahydroxybenzophenone, 2, 2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-
4,4'-dimethoxy-5-sodium sulfoxybenzophenone, bis (5-benzoyl-4-hydroxy-2)
-Methoxyphenyl) methane, 2-hydroxy-4-n
-Dodecyloxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone and the like.

Specific examples of the ultraviolet absorber compound include 2- (2-hydroxy-5-methylphenyl) benzotriazol and 2- (2-hydroxy-5-tert-octylphenyl) benzotriazo- in the benzotriazole type. 2- (2-hydroxy-3,5-dicumylphenyl) phenylbenzotriazole, 2- (2-hydroxy-3-tert-butyl-5-methylphenyl) -5
-Chlorobenzotriazole, 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6-
(2N-benzotriazol-2-yl) phenol], 2- (2-hydroxy-3,5-di-tert-
Butylphenyl) benzotriazole, 2- (2-hydroxy-3,5-di-tert-butylphenyl) -5
-Chlorobenzotriazole, 2- (2-hydroxy-
3,5-di-tert-amylphenyl) benzotriazol, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazol, 2- (2-hydroxy-5-tert-butylphenyl) benzotriazo-
2- (2-hydroxy-4-octoxyphenyl)
Benzotriazole, 2,2'-methylenebis (4-cumyl-6-benzotriazolephenyl), 2,2'-
p-Phenylenebis (1,3-benzoxazine-4-
On), and 2- [2-hydroxy-3- (3,4,
5,6-tetrahydrophthalimidomethyl) -5-methylphenyl] benzotriazole.

Specific examples of the ultraviolet absorber compound include 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-hexyloxyphenol and 2- (4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl) -5-hexyloxyphenol and the like can be mentioned.

Further, the polycarbonate resin composition of the present invention comprises bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate and bis (1,2,2,6,6-pentamethyl-4-piperidyl). Sebacate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl)-
1,2,3,4-butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, poly {[6- (1,1,3,3-Tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl] [(2,2,6,6-tetramethylpiperidyl) imino] hexamethylene [(2 , 2,6,6-Tetramethylpiperidyl) imino]}, and polymethylpropyl 3-oxy- [4- (2,2,6,6-tetramethyl)
A hindered amine-based light stabilizer typified by piperidinyl] siloxane may also be included.

The above-mentioned ultraviolet absorber and light stabilizer can be used alone or as a mixture of two or more kinds. The amount of each of the ultraviolet absorber and the light stabilizer used is 0.01 to 2 with respect to 100 parts by weight of the polycarbonate resin.
Parts by weight are preferred.

In the polycarbonate resin composition of the present invention, a bluing agent can be used within the range not impairing the object of the invention. The bluing agent is effective for eliminating the yellow tint of the polycarbonate resin molded product. In particular, in the case of molded products with weather resistance, since a certain amount of UV absorber is used, there is a reality that resin products tend to become yellowish due to "action and color of UV absorber". The use of a bluing agent is very effective for giving a molded article a natural transparency.

The amount of the bluing agent used in the present invention is 0.05 to 3 ppm with respect to the polycarbonate resin.
Is preferable, and 0.5-2.5 ppm is more preferable. If the amount used is too large, the blue tint of the resin product may be increased and the visual transparency may be reduced.

Typical examples of the bluing agent include Macrolex Violet B manufactured by Bayer and Terrazol Blue RLS manufactured by Sand Co.

In the polycarbonate resin composition of the present invention, various dyes and pigments can be used in addition to the bluing agent as long as the object of the invention is not impaired. Dyes are particularly preferable from the viewpoint of maintaining transparency. Preferred dyes are perylene dyes, coumarin dyes, thioindigo dyes, anthraquinone dyes, thioxanthone dyes, ferrocyanides such as navy blue, perinone dyes, quinoline dyes, quinacridone dyes, dioxazine dyes, isoindo dyes. Examples thereof include linone dyes and phthalocyanine dyes. Further, bisbenzoxazolyl-stilbene derivative, bisbenzoxazolyl-
Optical brighteners such as naphthalene derivatives, bisbenzoxazolyl-thiophene derivatives, and coumarin derivatives can be used. The amount of these dyes and optical brighteners used is 100 parts by weight of the polycarbonate resin,
0.0001 to 1 part by weight is preferable, and 0.0005 to 5
0.5 parts by weight is more preferable.

The polycarbonate resin composition of the present invention may contain a flame retardant in an amount that does not impair the object of the present invention. As the flame retardant, a halogenated bisphenol A polycarbonate type flame retardant, an organic salt flame retardant,
Examples thereof include aromatic phosphate ester-based flame retardants, halogenated aromatic phosphate ester-based flame retardants, and the like, and one or more of them can be used.

Specifically, the halogenated bisphenol A polycarbonate type flame retardant is a tetrabromobisphenol A polycarbonate type flame retardant, a copolymerized polycarbonate type flame retardant of tetrabromobisphenol A and bisphenol A, and the like.

Specifically, the organic salt-based flame retardant includes diphenylsulfone-3,3'-dipotassium disulfonate, potassium diphenylsulfone-3-sulfonate, sodium 2,4,5-trichlorobenzenesulfonate, 2,4,4. 5-
Potassium trichlorobenzenesulfonate, bis (2,6
-Potassium dibromo-4-cumylphenyl) phosphate, sodium bis (4-cumylphenyl) phosphate, bis (p
-Toluene sulfone) imide potassium, bis (diphenylphosphoric acid) imide potassium, bis (2,4,6-tribromophenyl) phosphate potassium, bis (2,4-dibromophenyl) phosphate potassium, bis (4-bromo) Examples thereof include potassium phenyl) phosphate, potassium diphenylphosphate, sodium diphenylphosphate, potassium perfluorobutanesulfonate, sodium or potassium lauryl sulfate, and sodium or potassium hexadecyl sulfate.

Specific examples of the halogenated aromatic phosphate ester type flame retardant include tris (2,4,6-tribromophenyl) phosphate, tris (2,4-dibromophenyl) phosphate and tris (4-bromophenyl). For example, phosphate.

Specific examples of the aromatic phosphate ester flame retardant include triphenyl phosphate, tris (2,6-xylyl) phosphate, and tetrakis (2,6-xylyl).
Resorcin diphosphate, tetrakis (2,6-xylyl) hydroquinone diphosphate, tetrakis (2,2
6-xylyl) -4,4'-biphenol diphosphate, tetraphenyl resorcin diphosphate, tetraphenylhydroquinone diphosphate, tetraphenyl-4,4'-biphenol diphosphate, aromatic ring source is resorcin and phenol and phenolic OH Group-free aromatic polyphosphate, aromatic ring source is resorcin and phenol and aromatic polyphosphate containing phenolic OH group, aromatic ring source is hydroquinone and phenol, aromatic polyphosphate not containing phenolic OH group, Aromatic polyphosphates containing similar phenolic OH groups, (“Aromatic polyphosphate” below refers to both aromatic polyphosphates containing phenolic OH groups and aromatic polyphosphates not containing phenolic OH groups. ) Aromatic polyphosphates whose aromatic ring sources are bisphenol A and phenol, aromatic polyphosphates whose aromatic ring sources are tetrabromobisphenol A and phenol, aromatic polyphosphates whose aromatic ring sources are resorcin and 2,6-xylenol , Aromatic polyphosphate whose aromatic ring source is hydroquinone and 2,6-xylenol, aromatic polyphosphate whose aromatic ring source is bisphenol A and 2,6-xylenol, and aromatic ring source tetrabromobisphenol A and 2,6 -Aromatic polyphosphates such as xylenol.

Other resins and elastomers may be used in the polycarbonate resin composition of the present invention in a small proportion within the range not impairing the object of the present invention.

Examples of such other resins include polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyamide resins, polyimide resins,
Polyether imide resin, polyurethane resin, silicone resin, polyphenylene ether resin, polyphenylene sulfide resin, polysulfone resin, polyolefin resin such as polyethylene and polypropylene, polystyrene resin, acrylonitrile / styrene copolymer (AS resin), acrylonitrile / butadiene / styrene copolymer Resins such as polymers (ABS resins), polymethacrylate resins, phenol resins, and epoxy resins can be mentioned.

As the elastomer, for example, isobutylene / isoprene rubber, styrene / butadiene rubber, ethylene / propylene rubber, acrylic elastomer, polyester elastomer, polyamide elastomer, MBS (methyl methacrylate / sterene) which is a core-shell type elastomer. / Butadiene) rubber, MA
Examples thereof include S (methyl methacrylate / acrylonitrile / styrene) rubber and the like.

The polycarbonate resin composition of the present invention may contain various inorganic fillers, antistatic agents, flow modifiers, antibacterial agents, photocatalytic antifouling agents, infrared absorbing agents, photochromic agents and the like. .

Further, various surface treatments can be applied to the molded article made of the polycarbonate resin composition of the present invention. As the surface treatment, various surface treatments such as a hard coat, a water / oil repellent coat, an ultraviolet absorption coat, an infrared absorption coat, and metallizing (vapor deposition etc.) can be performed.

Any method may be used to produce the polycarbonate resin composition of the present invention. For example, the components A and B, and optionally other additives, are thoroughly mixed using a premixing means such as a V-type blender, a Henschel mixer, a mechanochemical device, an extrusion mixer, and optionally an extrusion granulator. And a pelletizing machine and the like, and then pelletized by a device such as a pelletizer.

In addition, a method of supplying each component independently to a melt-kneader represented by a vent type twin-screw extruder, or pre-mixing a part of each component and then melt-kneading independently of the rest of the components The method of supplying to the machine is also included. As a method of premixing a part of each component, for example, the aliphatic full ester of the component B of the present invention is preliminarily mixed with a phosphorus-based stabilizer or a hindered phenol-based stabilizer, and then mixed or extruded with a polycarbonate resin. There is a method of directly supplying to the machine.

As a method of premixing, for example, A
In the case where a powdery form is included as an ingredient, a method of blending a part of the powder with an additive to prepare a masterbatch of the additive diluted with the powder can be mentioned. Furthermore, a method in which one component is independently supplied from the middle of the melt extruder may be used. When the components to be blended are liquid, a so-called liquid injection device or liquid addition device can be used for supplying to the melt extruder.

As the extruder, an extruder having a vent capable of degassing water in the raw material and volatile gas generated from the melt-kneaded resin can be preferably used. A vacuum pump for efficiently discharging generated water and volatile gas from the vent to the outside of the extruder is preferably installed. It is also possible to install a screen for removing foreign substances mixed in the extrusion raw material in the zone in front of the extruder die part to remove the foreign substances from the resin composition. Examples of such a screen include a wire mesh, a screen changer, a sintered metal plate (such as a disc filter).

Examples of the melt kneader include a twin screw extruder, a Banbury mixer, a kneading roll, a single screw extruder, and a multi-screw extruder having three or more screws.

The resin extruded as described above is directly cut into pellets, or after forming a strand, the strand is cut with a pelletizer to be pelletized. When it is necessary to reduce the influence of external dust or the like during pelletization, it is preferable to clean the atmosphere around the extruder.

The polycarbonate resin composition of the present invention can be manufactured into various products by injection molding such pellets to obtain molded products. In such injection molding, not only the usual molding method, but also injection compression molding,
Examples include injection press molding, gas-assisted injection molding, insert molding, in-mold coating molding, heat insulation mold molding, rapid heating and cooling mold molding, two-color molding, sandwich molding, and ultra-high speed injection molding. In addition, either cold runner method or hot runner method can be selected for molding.

The polycarbonate resin composition of the present invention can also be used in the form of various shaped extrusion molded articles, sheets, films and the like by extrusion molding. Further, an inflation method, a calendar method, a casting method or the like can be used for forming a sheet or a film. It is also possible to form a heat-shrinkable tube by applying a specific stretching operation. Further, the flame-retardant resin composition of the present invention can be formed into a hollow molded product by rotational molding, blow molding, or the like.

The polycarbonate resin composition of the present invention is
It is suitable for various transparent members that are excellent in transparency, hue, and releasability, and have various types of high quality in which distortion inside the molded product is reduced. Examples of such a transparent member include transparent members for various vehicles (head lamp lens, winker lamp lens, tail lamp lens, resin window glass, meter cover, etc.), lighting lamp cover, resin window glass (for construction, etc.), solar cell cover or Solar cell substrate, display device lens, touch panel,
And parts for game machines (pachinko machines, etc.) (circuit cover,
Chassis, pachinko ball transfer guide, etc.). Among these, a transparent member for vehicles, which is a large-sized molded product and has high quality requirements as described above, is preferable, and particularly, a headlamp lens, more specifically, a through-type headlamp lens is preferable. Here, the plain type headlamp lens includes a lamp cover that performs a light collecting function by a reflector, a lamp unit cover that integrally includes a lamp unit, and the like.

[0092]

The present invention will be further described with reference to the following examples. The evaluation was carried out by the following method. (1) Acid value of fatty acid full ester The acid value (KOHmg / g) was determined by the neutralization titration method according to JIS K0070.

(2) 5% weight loss temperature by thermogravimetric measurement of fatty acid full ester Hi-Res T manufactured by TA-instruments
GA2950 Thermogravimetric
20 using an Analyzer under N2 atmosphere.
The temperature was raised at 0 ° C./min, and the temperature at which the weight loss of the sample reached 5 wt% of the charged weight was measured as the TGA 5 wt% weight loss temperature.

(3) GC / MS of aliphatic carboxylic acid component
Measurement area ratio (Ss / Sp) The measurement by the pyrolysis methylation GC / MS method used in the present invention was carried out by the following procedure. GC / MS equipment is GC: HP6890 type and M
S: HP5793 type (both manufactured by Hewlett-Packard Co.) was used, and the thermal decomposition device was JHP-3.
(Nippon Analytical Industry Co., Ltd.) was used. A solution of the sample dissolved in chloroform was weighed out, and then chloroform was removed by a method of removing about 20 μg of the sample into a pyrofoil pyrolyzer (“F358” manufactured by Nippon Analytical Industry (358 ° C.).
For)). Further, 10 μl of a 2.5 wt% methanol solution of tetramethylammonium hydroxide (TMAH) was added as a reaction reagent to the sample,
After heating to about ℃ to remove the solvent, the reaction thermal decomposition was carried out by the above thermal decomposition apparatus at 358 ° C. for 10 seconds.
The conditions of the GC / MS measurement were as follows. The column is a capillary column DB-5MS (30 m × 0.2
5 mm × 0.25 μm, manufactured by J & W) was used, and helium gas was used as a carrier gas. In addition, the carrier gas is 72.4 KPa (10.5 ps) using the constant pressure mode.
The i) was set to a constant value, and the (initial) gas flow rate at 40 ° C. was 1.3 ml / min. Furthermore, the split ratio is 50 /
1, the inlet temperature was 300 ° C, and the temperature of the GC / MS connection was 280 ° C. Column bath temperature is 40 ℃
After holding for 5 minutes at 32 ° C at a heating rate of 20 ° C / min
The temperature was raised to 0 ° C., and the temperature was further held at 320 ° C. for 5 minutes for measurement. Further, the MS apparatus uses an electron impact ionization (EI) mode as an ionization mode, and the mass / charge number (m
/ Z): The measurement was performed in the range of 20 to 500. The number of scans per second was about 3. Further, the ion acceleration voltage and the like were set by auto tuning using a PFTBA standard sample. From the above measurement, the total ratio of Ss and Sp in the total aliphatic carboxylic acid component and the area ratio (Ss / Sp) thereof were calculated.

(4) Transparency of molded product Using a haze meter NDH-300A manufactured by Nippon Denshoku Co., Ltd., total light transmittance and Haz of a molded plate having a thickness of 2.0 mm were measured.
e was measured. The higher the numerical value of the total light transmittance, the higher the transparency. Haze is the turbidity of the molded product,
The lower the value is, the less turbidity is.

(5) Measurement of molding heat resistance With an injection molding machine having a maximum mold clamping force of 150 Ton, a cylinder temperature of 340 ° C., a mold temperature of 80 ° C., a molding cycle of 60 seconds and a thickness of 2 mm. The difference between the hue of the 50 mm square plate, the hue of the square plate, and the hue of the molded product that was formed after it was retained in the cylinder for 10 minutes at the cylinder temperature of 340 ° C. was shown as ΔE in the following equation. ΔE = ((L−L ′) ² + (a−a ′) ² + (b−b ′)
² ) ^1/2 (in the above, the (L, a, b) values represent the hue before retention, and the (L ', a', b ') values represent the hue after retention)

(6) Measurement of releasability Using an injection molding machine with a maximum mold clamping force of 75 Ton, the cylinder temperature is 300 ° C., the mold temperature is 80 ° C., and the injection pressure is 118 MPa.
The ejection load applied to the ejection pin at the time of molding a cup-shaped molded product having a size of 70 mmφ × 20 mm and a thickness of 4 mm was measured under the conditions described above, and the average value of 30 shots molding was shown as the mold release load.

(7) Strain molding of molded product Using a square plate prepared in the heat resistance test of the molded product, the state of strain of the molded product was visually confirmed by a polarizing plate (visual judgment: B
The level of Comparative Example 4 in which -4 was used was marked with x, and as the level of improvement was marked with Δ and ◯. ).

[Examples 1 and 2, Comparative Examples 1 to 5] 100 parts by weight of a polycarbonate resin produced from bisphenol A and phosgene by an interfacial polycondensation method was added with the polyhydric alcohol and the aliphatic carboxylic acid shown in Table 1. Various ester compounds and other additives were blended in the amounts shown in Table 1, 0.0002 parts by weight of a bluing agent (Made by Bayer Co., Ltd .: Macrolex Violet B) were blended and mixed in a blender, and then a vent system Melt kneading was carried out using a shaft extruder to obtain pellets. Additives to be added to the polycarbonate resin were prepared by preparing a pre-mixture with the polycarbonate resin in advance with a concentration of 10 to 100 times the compounding amount as a guide, and then mixing the whole with a blender. Bent type twin-screw extruder is manufactured by Japan Steel Works, Ltd .: TEX30α (complete meshing,
Same direction rotation, double thread screw) was used. The kneading zone had one type in front of the vent port. The extrusion conditions are a discharge rate of 20 kg / h and a screw rotation speed of 150 rp.
m, the degree of vacuum of the vent was 3 kPa, and the extrusion temperature was 280 ° C. from the first supply port to the die portion.

The obtained pellets were dried at 120 ° C. for 5 hours with a hot air circulation dryer, and then with an injection molding machine.
Under the conditions of a cylinder temperature of 340 ° C. and a mold temperature of 80 ° C., a square plate of 50 mm square having a thickness of 2 mm was formed. As the injection molding machine, T-150D manufactured by FANUC CORPORATION was used.
Table 1 shows the evaluation results of the obtained molded plate.

After drying the obtained pellets by the same method, the cylinder temperature was 300 ° C. and the mold temperature was 80.
The injection molding machine (SG260M-manufactured by Sumitomo Heavy Industries, Ltd.) was used to produce the transparent headlamp lens shown in FIG.
HP). This headlamp lens
The appearance such as hue and transparency was good. Further, when the inside of the molded product was observed for distortion in this headlamp lens in the same manner as described above, no distortion was observed in the example, and distortion was observed in the comparative example. In addition, Table 1
The fatty acid ester indicated by the medium symbols and other additives are as follows. (Component A) PC: Polycarbonate resin powder having a viscosity average molecular weight of 22,500 produced from bisphenol A and phosgene by an interfacial condensation polymerization method (manufactured by Teijin Chemicals: Panlite L-1225WP).

(Component B) B-1: The total of the area (Ss) of the stearic acid component and the area (Sp) of the palmitic acid component in the GC / MS method is 94% in the total aliphatic carboxylic acid component. Of fullerene of pentaerythritol and aliphatic carboxylic acid (mainly containing stearic acid and palmitic acid) having an area ratio (Ss / Sp) of 1.44 (manufactured by Riken Vitamin Co., Ltd .: Rikestar EW-400) , Acid value: 9, hydroxyl value: 6, iodine value: 0.4, and TGA 5% weight loss temperature: 322 ° C., the aliphatic carboxylic acid is derived from animal fats and oils. (Fatty acid ester other than component B) B-2: The total of Ss and Sp is 91% in the total aliphatic carboxylic acid component, and their area ratio (Ss / Sp) is 1.
11, a full ester of pentaerythritol and an aliphatic carboxylic acid (mainly containing stearic acid and palmitic acid) (manufactured by Cognis Japan KK: Roxyol VPG-861, acid value: 1, hydroxyl value: 7, Iodine value: 0, and TGA 5% weight loss temperature: 390 ° C., the aliphatic carboxylic acid is derived from vegetable oils and fats.) B-3: 90% of the total aliphatic carboxylic acid component is the total of Ss and Sp. And their area ratio (Ss / Sp) is 1.
07, a full ester of pentaerythritol and an aliphatic carboxylic acid (mainly containing stearic acid and palmitic acid) (manufactured by Riken Vitamin Co., Ltd .: RIKESTER EW-
440A, acid value: 2, hydroxyl value: 12, iodine value: 0.
4, and TGA 5% weight loss temperature: 378 ° C. The aliphatic carboxylic acid is made of vegetable oil. B-4: stearin monostearate (manufactured by Riken Vitamin Co .: Rikemar S-100A, acid value: 0.8, iodine value: 1.8, and TGA 5% weight loss temperature: 205)
℃)

(Other Additives) ST-1: Phosphonite heat stabilizer (Sandoz: Sandstab P-EPQ) ST-2: Phosphite heat stabilizer (Ciba Specialty Chemicals: Irgafos168) UVA: UV absorber (Kemipro Kasei Co., Ltd .: Chemisorb 79) HP: Phenolic antioxidant (Ciba Specialty Chemicals: Irganox 1076)

[0104]

[Table 1]

[0105]

EFFECTS OF THE INVENTION The polycarbonate resin composition of the present invention is excellent in mold releasability without deteriorating the transparency and hue of the molded product, and further, resin decomposition products and the like retained in the molding machine during molding are molded. It is extremely useful especially in the application of large-sized resin molded products such as headlamp lenses and resin windows for vehicles, because the mixing into the product is greatly improved and the molding strain generated during molding is greatly reduced.

[Brief description of drawings]

FIG. 1 shows a molded product of an automobile through headlamp lens molded in an example. As shown, the lens is dome-shaped. [1-A] shows a front view (a view projected on the platen surface at the time of molding. Therefore, such an area becomes the maximum projected area), and [1-B] shows a side sectional view.

[Explanation of symbols]

1 Headlamp lens body 2 Lens dome portion 3 Lens outer peripheral portion 4 Gate of molded product (width 30 mm, gate portion thickness 4 m
m) 5 sprue (diameter 7 mmφ of gate part) 6 diameter of lens outer periphery (220 mm) 7 diameter of dome part of lens (200 mm) 8 height of dome part of lens (20 mm) 9 thickness of lens molding (4 mm )

Continued front page    F-term (reference) 4F071 AA50 AC10 AE05 AE07 AF30                       AH07 BB01 BB03 BB05 BB06                       BC01                 4J002 CG001 CG011 CG021 EH046                       FD04 FD05 FD06 FD09 FD13                       FD16 GN00 GP00 GP01

Claims (5)

[Claims] 1. A polycarbonate resin (component A) 100
A resin composition comprising 0.005 to 2 parts by weight of a full ester of a polyhydric alcohol and an aliphatic carboxylic acid (component B), the aliphatic carboxylic acid comprising a palmitic acid component and a stearic acid component. In the peak area in the gas chromatograph-mass spectrometry (GC / MS method), the sum of the area of the palmitic acid component (Sp) and the area of the stearic acid component (Ss) is 80 in the total aliphatic carboxylic acid component. % Or more and the area ratio (Ss /
Sp) is 1.2 or more, The polycarbonate resin composition characterized by the above-mentioned. 2. The polycarbonate resin composition according to claim 1, wherein the polyhydric alcohol as the component B is pentaerythritol. 3. The area ratio (Ss / Sp) is 1.3 to
The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin composition is 30. 4. A molded article made of the polycarbonate resin composition according to claim 1. 5. The molded product according to claim 4, which is a transparent member for vehicles.