JP2003096291A - Antistatic polycarbonate resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antistatic polycarbonate resin composition that is superior in antistatic performance, and in transparency and color of a molding, and in resistance to molding heat and resistance to heat discoloration, and in productivity. SOLUTION: This antistatic polycarbonate resin composition is composed of (A) a polycarbonate resin of 100 pts.wt. (component a), (B) a benzene sulfonic acid phosphonium salt of 0.05-5 pts.wt. (component b) and (C) at least one compound of 0.0001-1 pts.wt. (component c) selected from the group consisting of an organic acid (component c-1), phosphorus acid (component c-2) and phosphoric acid (component c-3), characterized in that the antistatic agent component consisting of the component b and the component c, and the polycarbonate resin component as the component a are mixed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an antistatic polycarbonate resin composition. More specifically, the present invention relates to an antistatic polycarbonate resin composition having excellent antistatic performance, transparency of a molded article, hue, molding heat resistance, dry heat resistance, and productivity.

[0002]

2. Description of the Related Art Polycarbonate resins are widely used in electric, mechanical, automobile, medical and other applications because they have excellent transparency, heat resistance and mechanical strength. However, the polycarbonate resin has a large surface resistivity, and static electricity induced by contact or friction is hard to disappear,
Dust adhered to the surface of the molded product, discomfort due to electric shock to the human body,
Furthermore, there are problems such as generation of noise and malfunction in electronic products.

In particular, recently, there has been a problem that dust adheres to the inner surface of a transparent headlamp lens or an inner surface of an interior transparent cover for automobiles, or a resin window glass for a vehicle to deteriorate the transparency as it is used. The loss of transparency in such a part is not only a problem in appearance but also a major problem in ensuring safety during traveling.

Conventionally, as a method for preventing the electrostatic charge of a polycarbonate resin, a method of adding an alkali metal salt of sulfonic acid, a method of adding a phosphonium salt of sulfonic acid (JP-A-62-230835), and a phosphonium salt of sulfonic acid. And phosphite ester
-14267), a method of blending an amine salt of sulfonic acid and a phosphoric acid ester (JP-A-3-64368), and the like. However, the polycarbonate resin obtained by these methods has a problem that the transparency, the molding heat resistance, the hue, and the dry heat resistance are greatly reduced when formed into a molded plate.

On the other hand, a method of adding phosphorous acid and a phosphorous acid ester together with phosphonium sulfonate for the purpose of improving transparency, heat resistance of molding, hue and dry heat resistance (JP-A-11-
No. 80532) has also been proposed, but this method has problems such as a large decrease in the molecular weight of the polycarbonate at the time of molding and a markedly poor wet heat fatigue resistance of the molded product.

[0006]

An object of the present invention is to provide an antistatic polycarbonate which is excellent in antistatic performance, transparency of a molded article, hue, molding heat resistance, dry heat resistance, and productivity. It is to provide a resin composition.

The present inventor has conducted extensive studies as a result of achieving the above object, and as a result, in a resin composition comprising a polycarbonate resin and a phosphonium benzenesulfonate salt, at least one selected from organic acid, phosphorous acid and phosphoric acid. By using a specific amount of the compound and mixing the acid component and the antistatic agent component consisting of benzenesulfonic acid phosphonium salt and the polycarbonate resin, surprisingly, the antistatic performance is excellent and the molded article is transparent. It was clarified that the deterioration of the properties, hue, molding heat resistance, and dry heat resistance is significantly suppressed. In addition, it was confirmed that the productivity of the resin composition is substantially improved by this method,
The present invention has been completed.

[0008]

That is, according to the present invention, (A) 100 parts by weight of a polycarbonate resin (a component), (B) phosphonium benzenesulfonate represented by the following general formula (I): 05 to 5 parts by weight (component b) and (C) at least one compound selected from the group consisting of organic acid (component c-1), phosphorous acid (component c-2) and phosphoric acid (component c-3) 0.0001 to 1 part by weight (c
Component), wherein the resin composition comprises
Provided is an antistatic polycarbonate resin composition, which is a mixture of an antistatic agent component comprising a component b and a component c and a polycarbonate resin component of a component.

[0009]

[Chemical 4]

(In the formula, R ¹ is a hydrogen atom and has ^{1 to} 35 carbon atoms.
Is an alkyl group having 6 to 20 carbon atoms or an aryl group having 5 to 15 carbon atoms, and R ² is a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, an aralkyl group having 6 to 20 carbon atoms or a carbon number. 5 to 15 aryl groups, R ³ ,
R ⁴ , R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aralkyl group having 6 to 20 carbon atoms or an aryl group having 5 to 15 carbon atoms. )

The polycarbonate resin used as the component a in the present invention can be obtained, for example, by reacting a dihydric phenol with a carbonate precursor by a method such as an interfacial polymerization method or a melting method. Typical examples of the dihydric phenol used here include hydroquinone, resorcinol, 4,4'-biphenol, and 1,1-bis (4-
Hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane (abbreviation 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 (3,5-dibromo-4-hydroxyphenyl) sulfone, bis (4-hydroxy-3-methylphenyl) sulfide, 9, Examples thereof include 9-bis (4-hydroxyphenyl) fluorene and 9,9-bis (4-hydroxy-3-methylphenyl) fluorene. A preferable dihydric phenol is bis (4-hydroxyphenyl) alkane, and bisphenol A is particularly preferable.

As the carbonate precursor, carbonyl halide, carbonic acid diester or haloformate is used, 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 stopper, an antioxidant of the dihydric phenol and the like may be used if necessary. . 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.

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, halogenated hydrocarbons such as methylene chloride and chlorobenzene are 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 an end terminating agent such as t-butylphenol or p-cumylphenol.

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 carried out 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. Of these, 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. Oxides, alkali metal salts, alkaline earth metal salts, quaternary ammonium salts, alkali metal or alkaline earth metal alkoxides, alkali metal or alkaline earth metal organic acid salts, zinc compounds, boron compounds, silicon compounds, Examples of the catalyst that are usually used for esterification reaction or transesterification reaction of germanium compound, organotin compound, lead compound, antimony compound, manganese compound, titanium compound, zirconium compound and the like. The catalyst may be used alone or in combination of two or more kinds.

Further, in the polymerization reaction, in order to reduce the phenolic terminal group, for example, 2-chlorophenylphenyl carbonate, 2-methoxycarbonylphenylphenyl carbonate and 2-ethoxycarbonylphenylphenyl may be used at the latter stage or after the termination of the polycondensation reaction. It is preferable to add a compound such as carbonate.

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

The molecular weight of the polycarbonate resin in the present invention is 10,000 to 10 in terms of viscosity average molecular weight (M).
10,000 is preferable, 12,000 to 45,000 is more preferable, 15,000 to 40,000 is further preferable, and 21,000 to 30,000 is particularly preferable.
A polycarbonate resin having such a viscosity average molecular weight is preferable because sufficient strength can be obtained, melt flowability at the time of molding is also good, and molding distortion does not occur. The viscosity average molecular weight is obtained by inserting the specific viscosity (η _sp ) obtained from a solution of 0.7 g of polycarbonate resin dissolved in 100 ml of methylene chloride at 20 ° C. 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

In the present invention, the benzenesulfonic acid phosphonium salt represented by the above general formula (I) is used as the antistatic agent as the component b.

In the above general formula (I), R ¹ represents a hydrogen atom, an alkyl group having 1 to 35 carbon atoms, an aralkyl group having 6 to 20 carbon atoms or an aryl group having 5 to 15 carbon atoms. Here, the aralkyl group and the aryl group may contain a hetero atom.

The alkyl group having 1 to 35 carbon atoms may be a linear or branched alkyl group. For example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, pentyl group, 2-ethylbutyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, dodecyl group. , Tetradecyl group, octadecyl group, eicosyl group and the like.

As the aralkyl group having 6 to 20 carbon atoms,
Examples thereof include a benzyl group, a 2,6-ditertiarybutyl-4-methylbenzyl group, a phenethyl group, a phenylpropyl group, a naphthylmethyl group and a 2-phenylisopropyl group.

Examples of the aryl group having 5 to 15 carbon atoms include phenyl group, tolyl group, naphthyl group and pyridinyl group.

Among these, R ¹ has 1 to 3 carbon atoms.
An alkyl group having 5 carbon atoms is preferable, an alkyl group having 5 to 20 carbon atoms is more preferable, and an alkyl group having 10 to 15 carbon atoms is further preferable. Particularly, a dodecyl group is preferable from the viewpoint of compatibility with a polycarbonate resin and molecular dispersibility in the resin.

In the above general formula (I), R ² represents a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, an aralkyl group having 6 to 20 carbon atoms or an aryl group having 5 to 15 carbon atoms. here,
Aralkyl and aryl groups may contain heteroatoms.

The alkyl group having 1 to 7 carbon atoms may be a linear or branched alkyl group. For example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, pentyl group, 2-ethylbutyl group,
Hexyl group, heptyl group and the like can be mentioned.

As the aralkyl group having 6 to 20 carbon atoms,
Examples thereof include a benzyl group, a 2,6-ditertiarybutyl-4-methylbenzyl group, a phenethyl group, a phenylpropyl group, a naphthylmethyl group and a 2-phenylisopropyl group.

Examples of the aryl group having 5 to 15 carbon atoms include phenyl group, tolyl group, naphthyl group and pyridinyl group.

Of these, R ² is preferably a hydrogen atom or an alkyl group having 1 to 7 carbon atoms, and particularly preferably a hydrogen atom.

R ³ , R ⁴ , R ⁵ and R ⁶ are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or a 6 carbon atom.
Represents an aralkyl group having 20 to 20 or an aryl group having 5 to 15 carbon atoms. Here, the aralkyl group and the aryl group may contain a hetero atom.

The alkyl group having 1 to 20 carbon atoms may be a linear or branched alkyl group. Examples thereof include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group and octyl group.

As the aralkyl group having 6 to 20 carbon atoms,
Examples thereof include a benzyl group, a 2,6-ditertiarybutyl-4-methylbenzyl group, a phenethyl group, a phenylpropyl group, a naphthylmethyl group and a 2-phenylisopropyl group.

Examples of the aryl group having 5 to 15 carbon atoms include phenyl group, tolyl group, naphthyl group and pyridinyl group.

Of these, R ³ , R ⁴ , R ⁵ and R ⁶ are preferably an alkyl group having 1 to 20 carbon atoms, more preferably an alkyl group having 4 to 16 carbon atoms, and a butyl group and an octyl group. Particularly preferred.

The phosphonium benzenesulfonate salt is added in an amount of 0.0 to 100 parts by weight of the polycarbonate resin.
5 to 5.0 parts by weight, preferably 0.1 to 3.0 parts by weight,
It is more preferably used in the range of 0.5 to 2.5 parts by weight. If it is less than 0.05 parts by weight, a sufficient antistatic effect cannot be obtained, and if it exceeds 5.0 parts by weight, the mechanical properties of the polycarbonate resin molded product obtained by molding are poor, and the transparency and appearance are also deteriorated, which is preferable. Absent.

Such an antistatic agent may contain a very small amount of unreacted substances and impurities at the time of production as long as the object of the present invention is not impaired.

Further, the antistatic polycarbonate resin composition of the present invention may be used in combination with an antistatic agent other than the phosphonium benzenesulfonate salt.

Examples of such other antistatic agents include sodium benzenesulfonate, calcium benzenesulfonate, magnesium benzenesulfonate, barium benzenesulfonate, fatty acid ester compounds, carbon,
Examples include graphite and metal powder. The amount of the antistatic agent used is preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the polycarbonate resin composition.

In the present invention, an organic acid (c
-1 component), phosphorous acid (c-2 component) and phosphoric acid (c-3
At least one compound selected from the group consisting of components) is used. The component c is 0.0001 to 1 with respect to 100 parts by weight of the polycarbonate resin (component a).
It is used in the range of parts by weight, preferably 0.0005 to 0.5 parts by weight, more preferably 0.001 to 0.2 parts by weight. If the amount of the component c is less than 0.0001, sufficient heat stability effect cannot be obtained, and if it exceeds 1 part by weight, the molding heat resistance of the polycarbonate resin molded product obtained by molding is poor, and the transparency and mechanical properties are poor. It is not preferable because it decreases.

In the present invention, an organic acid is used as the component c-1 as an acidity adjusting agent and a stabilizer. The organic acid is not particularly limited structurally, and examples thereof include an organic carboxylic acid compound, an organic sulfonic acid compound, an organic phosphoric acid compound, and an organic amino acid compound.

Of these, organic carboxylic acid compounds are preferable as the component c-1. Among them, carboxylic acid compounds represented by the following general formula (II) and carboxylic acid anhydride compounds represented by the following general formula (III) are preferred. Particularly preferred.

[0047]

[Chemical 5]

(In the formula, R ⁷ is an alkyl group having 1 to 35 carbon atoms, an aralkyl group having 6 to 20 carbon atoms, or 5 to 1 carbon atoms.
5 represents an aryl group. )

[0049]

[Chemical 6]

(In the formula, R ⁸ and R ⁹ respectively have 1 to 3 carbon atoms.
5 represents an alkyl group having 5 carbon atoms, an aralkyl group having 6 to 20 carbon atoms or an aryl group having 5 to 15 carbon atoms. ) In the general formula (II), R ⁷ is an alkyl group having 1 to 35 carbon atoms, an aralkyl group having 6 to 20 carbon atoms, or 5 to 1 carbon atoms.
5 represents an aryl group. Here, the aralkyl group and the aryl group may contain a hetero atom.

The C1-C35 alkyl group may be a linear or branched alkyl group. For example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, pentyl group, 2-ethylbutyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, dodecyl group. , Tetradecyl group, octadecyl group, eicosyl group and the like.

As the aralkyl group having 6 to 20 carbon atoms,
Examples thereof include a benzyl group, a 2,6-ditertiarybutyl-4-methylbenzyl group, a phenethyl group, a phenylpropyl group, a naphthylmethyl group and a 2-phenylisopropyl group.

Examples of the aryl group having 5 to 15 carbon atoms include phenyl group, tolyl group, naphthyl group and pyridinyl group.

Among these, R ⁷ has 1 to 3 carbon atoms.
An alkyl group having 5 carbon atoms is preferable, an alkyl group having 1 to 10 carbon atoms is more preferable, and an alkyl group having 1 to 3 carbon atoms is further preferable. Acetic acid is particularly preferably used.

In the general formula (III), R ⁸ and R ⁹ each represent an alkyl group having 1 to 35 carbon atoms, an aralkyl group having 6 to 20 carbon atoms or an aryl group having 5 to 15 carbon atoms. Here, the aralkyl group and the aryl group may contain a hetero atom.

The alkyl group having 1 to 35 carbon atoms may be a linear or branched alkyl group. For example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, pentyl group, 2-ethylbutyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, dodecyl group. , Tetradecyl group, octadecyl group, eicosyl group and the like.

As the aralkyl group having 6 to 20 carbon atoms,
Examples thereof include a benzyl group, a 2,6-ditertiarybutyl-4-methylbenzyl group, a phenethyl group, a phenylpropyl group, a naphthylmethyl group and a 2-phenylisopropyl group.

Examples of the aryl group having 5 to 15 carbon atoms include phenyl group, tolyl group, naphthyl group and pyridinyl group.

Of these, R ⁸ and R ⁹ are preferably alkyl groups having 1 to 35 carbon atoms, and 1 to 1 carbon atoms.
An alkyl group having 0 is more preferable, and an alkyl group having 1 to 3 carbon atoms is further preferable. Acetic anhydride is particularly preferably used.

Component c-1 is a polycarbonate resin 10
It is used in an amount of preferably 0.005 to 1 part by weight, more preferably 0.01 to 0.5 part by weight, and further preferably 0.02 to 0.2, relative to 0 part by weight. When used in an amount within this range, a sufficient heat stability effect is obtained, and the polycarbonate resin molded product obtained by molding is excellent in molding heat resistance, and also has good transparency and mechanical properties, which is preferable.

Such an organic acid may be mixed with a very small amount of unreacted substances and impurities during the production as long as the object of the present invention is not impaired.

In the present invention, phosphorous acid is used as the c-2 component as a heat stabilizer and an acidity adjusting agent.

Such phosphorous acid is a polycarbonate resin 1
0.0001 to 0.1 part by weight, more preferably 0.0005 to 0.01 part by weight,
More preferably, it is used in an amount in the range of 0.001 to 0.005. When used in an amount within such a range, a sufficient heat stability effect can be obtained, the molding heat resistance of the polycarbonate resin molded article obtained by molding is excellent, the molecular weight is less likely to decrease during molding, and the mechanical properties are good, which is preferable. .

Such phosphorous acid may contain a very small amount of unreacted substances and impurities at the time of production as long as the object of the present invention is not impaired.

In the present invention, phosphoric acid is used as the c-3 component as a heat stabilizer and an acidity adjusting agent.

Such phosphoric acid is used in polycarbonate resin 10
It is preferably used in an amount of 0.0005 to 0.5 part by weight, more preferably 0.001 to 0.05 part by weight, and further preferably 0.002 to 0.01 part with respect to 0 part by weight. . When used in an amount within such a range, a sufficient heat stability effect is obtained, and the molding heat resistance of the polycarbonate resin molded product obtained by molding is excellent, the molecular weight is less likely to decrease during molding, and the mechanical properties are good, which is preferable. .

Such phosphoric acid may contain a very small amount of unreacted substances and impurities during the production so long as the object of the present invention is not impaired.

The reason why the thermal stability of the resin composition is improved by using an organic acid, phosphorous acid or phosphoric acid as the component c is as follows.
It can be considered as follows. That is, the phosphonium benzenesulfonate salt, which is blended as an antistatic agent in the present invention, is usually an unstable substance and easily decomposed by a thermal decomposition reaction or an oxidation reaction. In addition, some of the by-products generated by the decomposition reaction are substances that cause side reactions with colored substances and polycarbonate resins, so if the product is heated and melted and molded, or if a thermal history occurs in the molded product, the discoloration of the molded product will occur. As a result, deterioration of hue and decrease in molecular weight occur. In particular, in a basic atmosphere, a nucleophilic reaction to a sulfonic acid group and a carbonate group is likely to occur, so that it is considered that the phosphonium benzenesulfonate salt and the polycarbonate resin are easily decomposed. In order to reduce the decomposition as much as possible, it is considered that the best method is to adjust the acidity of the resin composition and suppress the decomposition of the phosphonium benzenesulfonate salt by the nucleophilic substitution reaction or the nucleophilic decomposition reaction.

The above-mentioned component c is all an acidic substance, and by using this, the acidity of the resin becomes sufficiently acidic, and as a result, the decomposition of the polycarbonate resin and the phosphonium benzenesulfonate salt is suppressed. Think

Further, among the acidic substances, the carboxylic acid compound and the carboxylic acid anhydride compound are considered to form an ester-like structure and stabilize with a benzenesulfonic acid derivative, which is considered to be a decomposition by-product. It is considered to have the effect of suppressing decomposition.

Further, phosphoric acid and phosphorous acid are considered to have an effect of trapping peroxide which is considered to be present in the resin composition and accelerate decomposition, and is considered to have a great effect on improving heat resistance.

On the other hand, in the present invention, benzenesulfonic acid phosphonium salt (b component) and acid component (c component)
A resin composition obtained by mixing an antistatic agent component consisting of and a polycarbonate resin component of a component.

In the present invention, a mixing method of mixing the above-mentioned components b and c in advance and then mixing this mixture with the component a is preferably adopted. By this method, the molding heat resistance and dry heat resistance of the resin composition are further greatly improved.

The reason why a large heat resistance stabilizing effect can be obtained by mixing a mixture of the b component and the c component with the polycarbonate resin as compared with the case where the b component and the c component are separately mixed with the polycarbonate resin is as follows. Can be thought of as.

That is, it is considered that the decomposition of the benzenesulfonic acid phosphonium salt as the component b is mainly caused by the nucleophilic reaction at the molecular level as described above. In order to suppress this decomposition, it is considered most effective to mix the c component with the phosphonium benzenesulfonate salt as uniformly as possible. Uniformly mix the component c with the component b in the smallest possible amount (because the higher amount of the component causes degradation such as decomposition of the phosphonium benzenesulfonate salt and lowering of the molecular weight of the resin). Is not a method of separately mixing the b component and the c component with the a component and then performing melt-molding such as pelletization. After mixing the b component and the c component as uniformly as possible in advance, the mixture is mixed with the a component and pelletized. It is considered that the best method is the method of melt molding. When the present inventor conducted an examination by this method, it was confirmed that the resin composition has a very large effect on the molding heat resistance and dry heat resistance.

The specific mixing method of the b component and the c component is not particularly limited, but a method capable of mixing as uniformly as possible while avoiding contact with air as much as possible is preferable. Further, when the viscosity of the b component is large, it is difficult to mix the components completely uniformly. In such a case, the b component is heated to reduce the viscosity, and c
Any method of mixing the components can be used. However, b
It is necessary to pay attention to the heating method because the components are easily decomposed at high temperature.For these reasons, use a closed stirring mixer with a jacket to prevent the internal temperature from increasing locally. The method of doing is desirable.

In the present invention, as described above, in addition to the effect of suppressing the decomposition of the phosphonium benzenesulfonate salt by the c component, the effect of suppressing the side reaction of the decomposed product, the effect of suppressing the decomposition of the polycarbonate resin, the characteristics of the b component and the c component are A very large synergistic effect is obtained by both of the heat-stabilizing effect of benzenesulfonic acid phosphonium salt by using various mixing methods, and it is completed for the first time. Either way,
The very large effects as obtained in the present invention cannot be obtained, and in the present invention, a large synergistic effect is obtained by adding the respective effects, and antistatic performance, hue, molding heat resistance, dry heat resistance are obtained. I think that the composition was very good.

Further, in the mixing method of the present invention, since the b component and the c component are mixed in advance and then the a component is mixed as described above, the method of mixing the b component and the c component individually with the a component can be adopted. In comparison, the pelletizing process can be further simplified, and the production efficiency and production cost can be further improved.

The antistatic polycarbonate resin composition of the present invention may further contain a phosphorus-based heat stabilizer in order to prevent a decrease in molecular weight and deterioration of hue during molding. Examples of such a heat stabilizer include phosphoric acid ester which is a phosphoric acid derivative, phosphorous acid ester which is a derivative of phosphorous acid, and phosphonous acid, phosphonic acid and esters thereof.

Specifically, triphenyl phosphite,
Tris (nonylphenyl) phosphite, tridecylphosphite, trioctylphosphite, trioctadecylphosphite, didecylmonophenylphosphite, dioctylmonophenylphosphite, diisopropylmonophenylphosphite, monobutyldiphenylphosphite, monodecyl Diphenyl phosphite, monooctyl diphenyl phosphite, tris (2,4-
Di-tert-butylphenyl) phosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, 2,2-methylenebis (4,6-di-tert-butylphenyl)
Octyl phosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-t
ert-butylphenyl) pentaerythritol diphosphite, distearyl pentaerythritol diphosphite,

Tributyl phosphate, triethyl phosphate, trimethyl phosphate, triphenyl phosphate, diphenyl mono-orthoxenyl phosphate, dibutyl phosphate, dioctyl phosphate,
Diisopropyl phosphate,

Tetrakis (2,4-di-iso-propylphenyl) -4,4'-biphenylenediphosphonite, tetrakis (2,4-di-n-butylphenyl)-
4,4'-biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -4,4 '
-Biphenylene diphosphonite, tetrakis (2,4-
Di-tert-butylphenyl) -4,3′-biphenylenediphosphonite, tetrakis (2,4-di-ter
t-butylphenyl) -3,3'-biphenylenediphosphonite, tetrakis (2,6-di-iso-propylphenyl) -4,4'-biphenylenediphosphonite,
Tetrakis (2,6-di-n-butylphenyl) -4,
4'-biphenylene diphosphonite, tetrakis (2,
6-di-tert-butylphenyl) -4,4'-biphenylenediphosphonite, tetrakis (2,6-di-t)
ert-Butylphenyl) -4,3'-biphenylenediphosphonite, tetrakis (2,6-di-tert-butylphenyl) -3,3'-biphenylenediphosphonite, bis (2,4-di-tert-). Butylphenyl)-
Phenyl-phenylphosphonite,

Examples thereof 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'-biphenylene diphosphonite and bis (2,4-di-tert-
Butylphenyl) -phenyl-phenylphosphonite is preferred.

These heat stabilizers may be used alone or in combination of two or more. The heat stabilizer is used in an amount of 0. 0 with respect to 100 parts by weight of the polycarbonate resin.
001 to 0.15 weight part is preferable.

In the antistatic polycarbonate resin composition of the present invention, the purpose is to improve the dispersion efficiency of the antistatic agent in the resin and reduce the concentration distribution, and the migration of the antistatic agent to the surface of the molded article during molding. The fatty acid ester compound can be used for the purpose of improving the above-mentioned properties, and for imparting releasability from the mold during molding.

Examples of such fatty acid esters include monohydric or polyhydric alcohols having 1 to 20 carbon atoms and 1 carbon atom.
Partial or total esters with 0 to 30 saturated fatty acids are preferred. Examples of the partial or whole ester of monohydric or polyhydric alcohol and saturated fatty acid include stearic acid monoglyceride, stearic acid diglyceride, stearic acid triglyceride, stearic acid monosorbitate, behenic acid monoglyceride, pentaerythritol monostearate, pentaerythritol. Tetrastearate, pentaerythritol tetrapelargonate, propylene glycol monostearate, stearyl stearate, palmityl palmitate, butyl stearate, methyl laurate, isopropyl palmitate, biphenyl biphenate, sorbitan monostearate, 2- Examples thereof include ethylhexyl stearate, and among them, stearic acid monoglyceride, stearic acid triglyceride, pentaerythric acid. Tall tetrastearate are preferably used. The amount of the fatty acid ester used is preferably 0.001 to 0.5 parts by weight based on 100 parts by weight of the polycarbonate resin composition.

When such a fatty acid ester compound is used in a polycarbonate resin, a method in which a master in which an antistatic agent is uniformly dispersed in a fatty acid ester compound is prepared in advance and this is blended with a polycarbonate resin and molded is It is more desirable from the viewpoint of dispersibility in resin, uniformity of concentration, and transferability to the surface of a molded product.

In the polycarbonate resin composition of the present invention, generally known antioxidants can be used for the purpose of preventing oxidation. Examples of such antioxidants include pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-laurylthiopropionate), glycerol-3-stearylthiopropionate, triethylene glycol-
Bis [3- (3-tert-butyl-5-methyl-4-
Hydroxyphenyl) propionate], 1,6-hexanediol-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], pentaerythritol-tetrakis [3- (3,5-di-).
tert-Butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert.
-Butyl-4-hydroxyphenyl) propionate,
1,3,5-Trimethyl-2,4,6-tris (3,5
-Di-tert-butyl-4-hydroxybenzyl) benzene, N, N-hexamethylenebis (3,5-di-t
ert-butyl-4-hydroxy-hydrocinnamide), 3,5-di-tert-butyl-4-hydroxy-benzylphosphonate-diethyl ester, tris (3,5-di-tert-butyl-4-hydroxybenzyl). Isocyanurate, 3,9-bis {1,1-dimethyl-2- [β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl} -2,4,8,10- Tetraoxaspiro (5,
5) Examples include undecane. The amount of these antioxidants used is preferably 0.001 to 0.05 parts by weight with respect to 100 parts by weight of the polycarbonate resin.

A releasing agent can be used in the polycarbonate resin composition of the present invention in order to further improve the releasability from the mold during melt molding so long as the object of the present invention is not impaired. Examples of the releasing agent include the fatty acid ester, polyorganosiloxane, paraffin wax, and beeswax. The amount of the release agent used is 0.0 with respect to 100 parts by weight of the polycarbonate resin composition.
01 to 0.5 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 can be mentioned.

In the benzotriazole type, 2- (2-hydroxy-5-methylphenyl) benzotriazole,
2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 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-benzotriazole-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) benzotriazole, 2- (2-hydroxy-5-
tert-octylphenyl) benzotriazole, 2
-(2-hydroxy-5-tert-butylphenyl)
Benzotriazole, 2- (2-hydroxy-4-octoxyphenyl) benzotriazole, 2,2'-methylenebis (4-cumyl-6-benzotriazolephenyl), 2,2'-p-phenylenebis (1 , 3-benzoxazin-4-one), 2- [2-hydroxy-3-
(3,4,5,6-tetrahydrophthalimidomethyl)
-5-methylphenyl] benzotriazole can be mentioned, and these can be used alone or as a mixture of two or more kinds. The amount of the ultraviolet absorber used is 0.01 to 2 with respect to 100 parts by weight of the polycarbonate resin composition.
Parts by weight are preferred.

In the polycarbonate resin molded article 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. Especially in the case of molded products with weather resistance, "action and color of UV absorber" is used because a certain amount of UV absorber is used.
As a result, resin products tend to be yellowish, and the use of a bluing agent is very effective for imparting a natural transparency to molded articles such as sheets.

The amount of the bluing agent used in the present invention is 0.05 to 2 relative to the polycarbonate resin molded product.
ppm is preferable and 0.5 to 2.0 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 blowing agent include Macrolex Violet B manufactured by Bayer and Triazol Bull-RLS manufactured by Sand Co.

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 tetrabromobisphenol A / bisphenol A copolymerized polycarbonate type flame retardant, and the like.

Specific examples of the organic salt flame retardant include 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.

In the polycarbonate resin composition of the present invention, other resins and elastomers may be used 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, and core-shell type MBS (methyl methacrylate / sterene elastomer). / Butadiene) rubber, MA
Examples thereof include S (methyl methacrylate / acrylonitrile / styrene) rubber and the like.

Any method may be employed to produce the polycarbonate resin composition of the present invention. For example, a method of mixing a polycarbonate resin powder, an antistatic agent, a phosphorus-based stabilizer, and a desired additive with a tumbler, a V-type blender, a super mixer, a Nauter mixer, a Banbury mixer, a kneading roll, an extruder, or the like is appropriately used. . The polycarbonate resin composition thus obtained can be molded into a molded product by a generally known method such as an injection molding method, an extrusion molding method, or a compression molding method as it is or after it is once pelletized by a melt extruder.

The polycarbonate resin composition of the present invention is
It is suitable for headlamp lenses, lighting cover, and organic window glass (for vehicles and building materials) because of its excellent antistatic property, transparency, hue, and heat resistance. In particular, the polycarbonate resin composition of the present invention is suitable for use as a headlamp lens because it has little deterioration in hue and molecular weight during molding and excellent antistatic performance.

[0105]

The present invention will be further described with reference to the following examples. Unless otherwise specified, parts in the examples are parts by weight and%
Is% by weight. The evaluation was based on the following method.

(1) Molding heat resistance (i) Amount of decrease in molecular weight: "Plate for measuring hue before retention" (length 70 mm x width 50 mm x thickness) at a molding temperature of 315 ° C for 1 minute cycle using an injection molding machine 2 mm). Further, the resin was allowed to stay in the cylinder for 10 minutes and then molded to obtain a “flat plate for measuring hue after retention”. The molecular weight of the flat plate before and after the retention was measured, and the difference was obtained. The smaller the value, the better the molding heat resistance.

(Ii) ΔE (change in hue): In the retention test, the hue of the flat plate before and after retention was measured by a color difference meter,
The color difference ΔE was calculated by the following formula. The smaller the value (ΔE) shown in the table, the better the molding heat resistance. ΔE = ((L−L ′) ² + (a−a ′) ² + (b−b ′)
² ) ^1/2 Hue before retention: L, a, b Hue after retention: L ', a', b '

(2) Hue (YI value): X, Y, which was obtained by measuring the "plate for hue measurement before retention" molded by the above method using a color difference meter Z-1001DP manufactured by Nippon Denshoku Co., Ltd. It was calculated from Z based on ASTM-E1925 using the following formula. The larger the YI value, the stronger the yellow tint of the molded plate. YI = [100 (1.28X-1.06Z)] / Y

(3) Dry heat resistance (ΔYI): The temperature setting of the “flat plate for hue measurement before retention” formed by the above method was set to 120.
It was stored in a dryer at ℃ for 1000 hours. The ΔYI value, which is the difference between the YI value of the molded plate after storage and the value before storage, was calculated.
The smaller the ΔYI value, the smaller the color change of the molded plate and the better the dry heat resistance.

(4) Transparency (haze): Transparency was measured by measuring the haze of the "plate for hue measurement before retention" molded by the above method with NDH-300A manufactured by Nippon Denshoku Co., Ltd.
The larger the haze value, the larger the light diffusion and the poorer the transparency.

(5) Antistatic Performance (Surface Resistivity): The surface resistivity value of the "hue measurement flat plate before retention" molded by the above method was measured by the Toa Denpa Kogyo KK SM-8210 ultimate insulation tester. It was measured by. The smaller the value, the better the antistatic performance.

[Examples 1 to 4, Comparative Examples 1 to 4] A molecular weight of 22000 produced by an interfacial polymerization method from bisphenol A and phosgene (polymer 0.7 g was dissolved in 100 ml of methylene chloride, and the ratio was measured at 20 ° C. Viscosity 0.4
To 100 parts of the polycarbonate resin of 0), tetrabutylphosphonium dodecylbenzene sulfonate (b-1 component in Table 1) as the b component and the compound shown in the Table 1 as the c component were blended in the amounts shown in Table 1, respectively, and further Tetrakis (2,4-di-tert-butylphenyl) -biphenylenediphosphonite 0.035 parts as heat stabilizer, bis (2,4-di-tert-butylphenyl) -phenyl-phenylphosphonite 0.008 parts , Tris (2,4
-Di-tert-butylphenyl) phosphite 0.0
08 parts, 0.05 part of 3,5-bis (1,1-dimethylethyl) -4-hydroxybenzenepropionic acid octadecyl ester as an antioxidant, and 0.05 of Bayer Co., Ltd. Macrolex Violet as a bluing agent.
002 parts were blended and mixed. However, as the mixing method of the b component and the c component, two kinds of methods as shown in Table 1 were compared and examined. In the method I, the components b and c were previously heated to 80 ° C., mixed to form a sufficiently homogeneous solution, cooled to room temperature, and then mixed with the polycarbonate resin. On the other hand, in Method II, the b component and the c component were not mixed, but separately mixed with the polycarbonate resin.
After blending the polycarbonate resin and each additive by such a method, they were melt-kneaded using a vent type single-screw extruder to obtain pellets. The obtained pellets were molded into a measurement sample under the conditions of a cylinder temperature of 315 ° C. using an injection molding machine. Table 1 shows the evaluation results of the obtained molded plate. Further, using the pellets obtained from the compositions of Examples 1 to 4, headlamp lenses were prepared according to a known method. The headlamp lens had a good appearance such as hue and transparency, and the decrease in molecular weight during molding was small.

[Comparative Example 5] Pellets were obtained in the same manner as in Example 1 except that acetic acid was not added as the component c. The obtained pellet was molded by the same method as in Example 1. Table 1 shows the evaluation results of the obtained molded plate.
It was shown to.

[Reference Example 1] The polycarbonate resin used in Example 1 was pelletized by the same method as in Example 1. The obtained pellet was molded by the same method as in Example 1. Table 1 shows the evaluation results of the obtained molded plate.

[0115]

[Table 1]

[0116]

EFFECT OF THE INVENTION The antistatic polycarbonate resin composition of the present invention is excellent in antistatic performance, and further excellent in transparency, hue, molding heat resistance and dry heat resistance of a molded article, and also excellent in productivity, so that it can be easily charged. It is very useful for large-sized molded articles formed by continuous molding, in which the phenomenon is a problem, especially for headlamp lens applications.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09K 3/16 102 C09K 3/16 102E 108 108D G02B 1/04 G02B 1/04

Claims (6)

[Claims] 1. (A) 100 parts by weight of a polycarbonate resin (a component), (B) 0.05 to 5 parts by weight (b) of a benzenesulfonic acid phosphonium salt represented by the following general formula (I):
Component) and (C) organic acid (c-1 component), phosphorous acid (c
-2 component) and at least one compound selected from the group consisting of phosphoric acid (c-3 component) in an amount of 0.0001 to 1 part by weight (component c), the resin composition comprising b An antistatic polycarbonate resin composition, characterized in that an antistatic agent component comprising a component and a component c and a polycarbonate resin component of the component a are mixed. [Chemical 1] (In the formula, R ¹ is a hydrogen atom, an alkyl group having 1 to 35 carbon atoms, an aralkyl group having 6 to 20 carbon atoms, or 5 to 1 carbon atoms.
5 represents an aryl group, R ² is a hydrogen atom, and has 1 to 7 carbon atoms.
And an aralkyl group having 6 to 20 carbon atoms or an aryl group having 5 to 15 carbon atoms, wherein R ³ , R ⁴ , R ⁵ and R ⁶ are each independently a hydrogen atom or 1 to 20 carbon atoms.
Is an alkyl group, a C6-20 aralkyl group, or a C5-15 aryl group. ) 2. An organic acid (component c-1) is a carboxylic acid compound represented by the following general formula (II) and a general formula (II) below.
The antistatic polycarbonate resin composition according to claim 1, which is at least one compound selected from the group consisting of carboxylic acid anhydride compounds represented by I). [Chemical 2] (In the formula, R ⁷ is an alkyl group having 1 to 35 carbon atoms, and 6 carbon atoms.
Represents an aralkyl group having 20 to 20 or an aryl group having 5 to 15 carbon atoms. ) [Chemical 3] (In the formula, R ⁸ and R ⁹ are each an alkyl group having 1 to 35 carbon atoms, an aralkyl group having 6 to 20 carbon atoms, or 5 to 1 carbon atoms.
5 represents an aryl group. ) 3. The organic acid (component c-1) is added in an amount of 0.005 with respect to 100 parts by weight of the polycarbonate resin (component a).
To 1 part by weight. The antistatic polycarbonate resin composition according to claim 1. 4. The phosphorous acid (c-2 component) is 0.000 with respect to 100 parts by weight of the polycarbonate resin (a component).
The antistatic polycarbonate resin composition according to claim 1, which is 1 to 0.1 parts by weight. 5. The phosphoric acid (component c-3) is added in an amount of 0.0005 with respect to 100 parts by weight of the polycarbonate resin (component a).
The amount of the antistatic polycarbonate resin composition according to claim 1 is 0.5 to 0.5 parts by weight. 6. A headlamp lens formed from the antistatic polycarbonate resin composition according to claim 1.