JP2002275366A - Highly reflective aromatic polycarbonate resin composition and its molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame-retardant, highly reflective aromatic polycarbonate resin composition having high light reflection characteristics, excellent in mechanical characteristics and flame retardancy, exhibiting excellent molding appearances and suitable for uses as a reflection plate, and its molded article. SOLUTION: The aromatic polycarbonate resin composition comprises (A) 100 pts.mass of an aromatic polycarbonate resin, and incorporated therewith, (B) 5-80 pts.mass of titanium oxide, (C) 0.5-30 pts.mass of a composite rubber- based graft copolymer obtained by graft-polymerizing a vinyl monomer onto a composite rubber having a structure where a polyorganosiloxane rubber component and a polyalkyl (meth)acrylate rubber component are entangled with each other, (D) 2-30 pts.mass of a flame retardant, and (E) 0.1-8 pts.mass of a modified polytetrafluoroethylene comprising a polytetrafluoroethylene particle having a particle size of at most 10 μm and an organic polymer and containing 0.5-80 mass%, based on the total weight, of the polytetrafluoroethylene.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a polycarbonate resin composition. More specifically, the present invention relates to a polycarbonate resin composition having excellent appearance and high light reflectivity without impairing the physical properties of the polycarbonate resin such as impact resistance and heat resistance, and molded articles thereof.

[0002]

2. Description of the Related Art Conventionally, a plated product obtained by plating a resin molded product has been used as a light reflecting material. However, such a plated product requires a complicated plating process, which leads to an increase in cost, and there is a need for a reflective material that does not require plating and has a high reflectivity in the resin molded product itself. . Aromatic polycarbonate resins are suitable for reflector applications because of their excellent mechanical properties, dimensional stability, heat resistance and the like.

[0003]

However, since the polycarbonate resin is excellent in transparency, if the amount of titanium oxide is small, the amount of transmitted light is large, and the required high light reflectivity cannot be obtained. However, when the amount of titanium oxide is increased, there arises a problem that the intrinsic physical properties of the polycarbonate resin such as impact resistance are impaired. In addition, as the products have become lighter and thinner, the aromatic polycarbonate resin reflectors have also become thinner and required to have high appearance and flame retardancy.

As a method for solving the above problem, a method of adding titanium oxide surface-treated with a specific polyorganosiloxane to a polycarbonate resin when titanium oxide is blended with the aromatic polycarbonate resin (Japanese Patent Laid-Open No. 4-2)
No. 02476) and a method of adding a specific rubbery polymer (Japanese Patent Application Laid-Open No. 9-12853). However, although these proposals can improve the light reflection performance and mechanical properties, they do not sufficiently satisfy the performance as a reflector, particularly the appearance such as flame retardancy and surface smoothness. That is, although polytetrafluoroethylene is blended as a flame retardant and an anti-dripping agent for imparting flame retardancy, at present, there is no material having both flame retardancy and molded appearance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a high light reflection property, excellent mechanical properties, excellent flame retardancy, and excellent flame retardancy suitable for use as a reflector having excellent molded appearance. An object is a highly reflective aromatic polycarbonate resin composition and a molded article thereof.

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has found that titanium oxide, a specific rubbery polymer, a flame retardant, and a modified polytetrafluorocarbon are added to an aromatic polycarbonate resin. The inventors have found that the above object can be achieved by blending a specific amount of ethylene, and have completed the present invention. The aromatic polycarbonate resin composition of the present invention comprises: (A) an aromatic polycarbonate resin: 100
(B) titanium oxide: 5 to 80 parts by mass with respect to parts by mass;
(C) 10 to 90% by mass of a polyorganosiloxane rubber component and 90 to 90% of a polyalkyl (meth) acrylate rubber component
A composite rubber-based graft copolymer obtained by graft-polymerizing one or two or more vinyl monomers onto a composite rubber having a structure in which 10% by mass (the total amount thereof is 100% by mass) is entangled with each other: 0.5 to 30 parts by mass, and (D) a flame retardant: 2
And (E) a polytetrafluoroethylene content of 0.5 to 80% by mass with respect to the total amount;
Modified polytetrafluoroethylene comprising polytetrafluoroethylene particles of 0 μm or less and an organic polymer:
0.1 to 8 parts by mass. Here, the composite rubber composed of the polyorganosiloxane rubber component and the polyalkyl (meth) acrylate rubber component in the composite rubber-based graft copolymer (C) has an average particle diameter of 0.08 to 0.6 μm. It is desirable. The molded article of the present invention is molded using the above aromatic polycarbonate resin composition.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The aromatic polycarbonate resin (A) used in the present invention can be obtained by a phosgene method in which various dihydroxydiaryl compounds are reacted with phosgene, or a transesterification method in which a dihydroxydiaryl compound is reacted with a carbonate such as diphenyl carbonate. And typical examples thereof are 2,2-
Polycarbonates made from bis (4-hydroxyphenyl) propane (bisphenol A).

As the dihydroxydiaryl compound, in addition to bisphenol A, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl)
Butane, 2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 1,1-bis (4 -Hydroxy-3-tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane,
2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3,5-
Bis (hydroxyaryl) alkanes such as dichlorophenyl) propane, bis (hydroxyaryl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl) cyclopentane and 1,1-bis (4-hydroxyphenyl) cyclohexane , 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-
Dihydroxy diaryl ethers such as dimethyl diphenyl ether 4,4'-dihydroxy diphenyl sulfide 4,4'-dihydroxy-3,3'-dihydroxy diaryl sulfides such as dimethyl diphenyl sulfide 4,4'-dihydroxy diphenyl sulfoxide Dihydroxydiarylsulfoxides such as 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfoxide, such as 4,4'-dihydroxydiphenylsulfone, and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone Dihydroxydiaryl sulfones and the like.

These may be used alone or in admixture of two or more. In addition, piperazine, dipiperidyl hydroquinone, resorcin, 4,4'-dihydroxydiphenyl and the like may be used in combination. Further, the above dihydroxyaryl compound and a phenol compound having a valence of 3 or more as shown below may be mixed and used. Phloroglucin, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptene-2,4,6-dimethyl-2,4,6-tri- (4
-Hydroxyphenyl) -heptane, 1,3,5-tri-
(4-hydroxyphenyl) -benzol, 1,1,1-
Tri- (4-hydroxyphenyl) -ethane and 2,
2-bis- [4,4- (4,4'-dihydroxydiphenyl) -cyclohexyl] -propane and the like.

The viscosity average molecular weight of the aromatic polycarbonate resin (A) is not particularly limited, but it is usually 10,000 to 100,000, preferably 15 to 100,000 in view of moldability and strength.
000-35,000. In producing such an aromatic polycarbonate resin, a molecular weight regulator, a catalyst and the like can be used as needed.

The titanium oxide (B) used in the present invention may be a titanium oxide produced by either a chlorine method or a sulfuric acid method. Any of a rutile type and an anatase type may be used, but a rutile type is preferable in terms of thermal stability, weather resistance and the like. The shape of the fine powder particles is not particularly limited, and can be appropriately selected and used, such as a flake, a sphere, and an irregular shape. The titanium oxide used as the component (B) is preferably one that has been surface-treated with an amine compound, a polyol compound, or the like, in addition to a hydrated oxide of aluminum and / or silicon. Examples of the hydrated oxide of aluminum or silicon, the amine compound and the polyol compound include hydrated alumina, hydrated silica, triethanolamine, and trimethylolethane. These titanium oxides are more preferably further treated with an organic surface treating agent. Examples of the organic surface treating agent include siloxanes such as alkylpolysiloxane, alkylarylpolysiloxane, and alkylhydrogenpolysiloxane, and organosilicon such as alkylalkoxysilane and amino-based silane coupling agent. Preferred specific examples include methyl hydrogen polysiloxane, methyltrimethoxysilane, trimethylmethoxysilane, N-β (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β
(Aminoethyl) -γ-aminopropylmethyldimethoxysilane and the like. The surface treatment agent may contain a stabilizer, a dispersant, and the like in an amount that does not impair the present invention. By performing this surface treatment, the uniform dispersibility in the aromatic polycarbonate resin composition and the stability of the dispersed state are improved, and the affinity with the flame retardant of the component (D) described later is also improved to improve uniformity. It is preferable in the production of a novel composition. The treatment method itself in the surface treatment is not particularly limited, and an arbitrary method is appropriately adopted. The amount of the surface treatment agent imparted to the surface of the titanium oxide particles by this treatment is not particularly limited, but the light reflectivity of the titanium oxide and 1 to 1 with respect to the titanium oxide in consideration of the moldability of the polycarbonate resin composition. About 15% by mass is appropriate.

In the composition of the present invention, the particle diameter of the titanium oxide powder used as the component (B) is as follows:
In order to exhibit the above-mentioned effects efficiently, the average particle diameter is 0.1 to 0.1.
Those having a thickness of about 0.5 μm are preferred. In the composition of the present invention, the mixing ratio of the titanium oxide used as the component (B) is such that the aromatic polycarbonate resin (A) 100
5 to 80 parts by mass, preferably 5 to 45 parts by mass
Parts by weight. If the proportion of titanium oxide is less than 5 parts by mass, the amount of transmitted light increases, and the required high reflectance cannot be obtained. On the other hand, if it exceeds 80 parts by mass, the molecular weight of the polycarbonate resin is lowered and the physical properties (particularly the impact strength) are lowered.

The composite rubber-based graft copolymer (C) used in the present invention refers to 10 to 90% by mass of a polyorganosiloxane rubber component and 90 to 10% by mass of a polyalkyl (meth) acrylate rubber component (for each rubber component). (Total amount is 100% by mass), and the two rubber components are intertwined with each other (except for the composite rubber in which the polyorganosiloxane rubber component is a core and the poly (meth) acrylate rubber component is a shell), It is a copolymer obtained by graft polymerization of one or more vinyl monomers.

Even when one of a polyorganosiloxane rubber component and a polyalkyl (meth) acrylate rubber component or a simple mixture thereof is used as a rubber source instead of the composite rubber, the characteristics of the resin composition of the present invention are obtained. Is not obtained, and a polyorganosiloxane rubber component and a polyalkyl (meth) acrylate rubber component are entangled with each other to be combined and integrated to obtain a resin composition which gives a molded article having excellent impact resistance and molded surface appearance. Can be.

When the content of the polyorganosiloxane rubber component constituting the composite rubber exceeds 90% by mass, the surface appearance of a molded article formed from the obtained resin composition is deteriorated, and the polyalkyl (meth) acrylate rubber component is deteriorated. If it exceeds 90% by mass, the impact resistance of a molded article from the obtained resin composition will be deteriorated. Therefore, each of the two types of rubber components constituting the composite rubber needs to be in the range of 10 to 90% by mass (however, the total amount of both rubber components is 100% by mass), and further 20 to 80% by mass. % Is particularly preferred.

The average particle size of the above composite rubber is 0.08 to 0.1.
It is desirable to be in the range of 6 μm. The average particle size is 0.
When it is less than 08 μm, the impact resistance of the molded article from the obtained resin composition is deteriorated, and when the average particle diameter exceeds 0.6 μm, the impact resistance of the molded article from the obtained resin composition is deteriorated. This is because the molding surface appearance tends to deteriorate. . An emulsion polymerization method is most suitable for producing a composite rubber having such an average particle size. First, a latex of a polyorganosiloxane rubber is prepared, and then a monomer for synthesizing an alkyl (meth) acrylate rubber is prepared. It is preferable to polymerize the synthesis monomer after impregnating the rubber particles of the organosiloxane rubber latex.

The polyorganosiloxane rubber component constituting the composite rubber can be prepared by emulsion polymerization using the following polyorganosiloxane and a crosslinking agent (I). In this case, the graft crosslinking agent (I) Can also be used in combination.

Examples of the organosiloxane include various cyclic members having three or more membered rings.
A 6-membered ring. For example, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, trimethylphenylcyclotrisiloxane, tetramethyltetraphenylcyclotetrasiloxane, okitaphenylcyclotetrasiloxane and the like can be mentioned. These may be used alone or as a mixture of two or more.
These are used in an amount of 5% in the polyorganosiloxane rubber component.
0 mass% or more, preferably 70 mass% or more.

As the crosslinking agent (I), a trifunctional or tetrafunctional silane crosslinking agent such as trimethoxymethylsilane, triethoxyphenylsilane, tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane , Tetrabutoxysilane and the like are used. Particularly, a tetrafunctional crosslinking agent is preferable, and among them, tetraethoxysilane is particularly preferable. The amount of the crosslinking agent used is 0.1 to 30% by mass in the polyorganosiloxane rubber component. As the graft-linking agent (I), a compound capable of forming a unit represented by the following formula is used. CH2 = CR2-COO- (CH2) p-SiR1nO (3-n) / 2 (I-1) CH2 = CH-SiR1nO (3-n) / 2 (I-2) HS- ( CH2) p-SiR1nO (3-n) / 2 (I-3) (in each formula, R1 is a methyl group, an ethyl group, a propyl group or a phenyl group, R2 is a hydrogen atom or a methyl group, and n is 0 , 1
Or 2, p shows the number of 1-6. The (meth) acryloyloxysiloxane capable of forming the unit of the formula (I-1) has a high grafting efficiency and can form an effective graft chain, which is advantageous in terms of the development of impact resistance. Note that methacryloyloxysiloxisan is particularly preferable as a unit capable of forming the unit of the formula (I-1). Specific examples of methacryloyloxysiloxane include β-methacryloyloxyethyldimethoxymethylsilane, γ-methacryloyloxypropylmethoxydimethylsilane, γ-methacryloyloxypropyldimethoxymethylsilane, γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxy Examples thereof include propylethoxydiethylsilane, γ-methacryloyloxypropyldiethoxymethylsilane, and δ-methacryloyloxybutyldiethoxymethylsilane.
The amount of the graft crossing agent used is 0 to 10% by mass in the polyorganosiloxane rubber component.

For the production of the latex of the polyorganosiloxane rubber component, the methods described in, for example, US Pat. Nos. 2,891,1920 and 3,247,725 can be used. In the practice of the present invention, for example, a mixture of an organosiloxane and a crosslinking agent (I) and, if desired, a graft crosslinking agent (I) are mixed in the presence of a sulfonic acid emulsifier such as alkylbenzenesulfonic acid or alkylsulfonic acid.
For example, it is preferably produced by a method of shear mixing with water using a homogenizer or the like. Alkylbenzene sulfonic acid is suitable because it acts as an emulsifier for the organosiloxane and also serves as a polymerization initiator. At this time, it is preferable to use a metal salt of an alkyl benzene sulfonic acid, a metal salt of an alkyl sulfonic acid or the like in combination, since this is effective for stably maintaining the polymer during graft polymerization.

The polyalkyl (meth) acrylate rubber component constituting the composite rubber can be synthesized using the following alkyl (meth) acrylate, a crosslinking agent (II) and a graft crossing agent (II).

As the alkyl (meth) acrylate,
For example, methyl acrylate, ethyl acrylate, n-
Propyl acrylate, n-butyl acrylate, 2-
Examples thereof include alkyl acrylates such as ethylhexyl acrylate and alkyl methacrylates such as hexyl methacrylate, 2-ethylhexyl methacrylate, and n-lauryl methacrylate, and use of n-butyl acrylate is particularly preferable.

Examples of the crosslinking agent (II) include ethylene glycol dimethacrylate, propylene glyceryl dimethacrylate, 1,3-butylene glycol dimethacrylate, and 1,4-butylene glycol dimethacrylate.

Examples of the grafting agent (II) include allyl methacrylate, triallyl cyanurate, triallyl isocyanurate and the like. Allyl methacrylate can also be used as a crosslinking agent. These crosslinking agents and graft crossing agents are used alone or in combination of two or more. The total amount of the crosslinking agent and the graft crosslinking agent used is 0.1 to 20% by mass in the polyalkyl (meth) acrylate rubber component.

The polymerization of the polyalkyl (meth) acrylate rubber component is carried out by adding the above alkyl (meth) acrylate into a latex of the polyorganosiloxane rubber component neutralized by adding an aqueous alkali solution such as sodium hydroxide, potassium hydroxide or sodium carbonate. After adding an acrylate, a cross-linking agent and a graft cross-linking agent and impregnating the polyorganosiloxane rubber particles, the reaction is carried out by the action of a usual radical polymerization initiator. As the polymerization proceeds, a crosslinked network of polyalkyl (meth) acrylate rubber entangled with the crosslinked network of polyorganosiloxane rubber is formed, and a substantially inseparable polyorganosiloxane rubber component and polyalkyl (meth) acrylate rubber component are formed. A composite rubber and latex are obtained. In the practice of the present invention, as the composite rubber, the main skeleton of the polyorganosiloxane rubber component has a repeating unit of dimethylsiloxane, and the main skeleton of the polyalkyl (meth) acrylate rubber component has a repeating unit of n-butyl acrylate. Composite rubber is preferably used.

The composite rubber thus prepared by emulsion polymerization can be graft-copolymerized with a vinyl monomer. The gel content measured by extracting the composite rubber with toluene at 90 ° C. for 12 hours is 80% by mass or more.

Examples of the vinyl monomers graft-polymerized on the composite rubber include aromatic alkenyl compounds such as styrene, α-methylstyrene and vinyl toluene; methacrylates such as methyl methacrylate and 2-ethylhexyl methacrylate; methyl acrylate; Acrylic acid esters such as ethyl acrylate and bryl acrylate;
Examples include various vinyl monomers such as vinyl cyanide compounds such as acrylonitrile and methacrylonitrile, and these may be used alone or in combination of two or more.

The ratio of the composite rubber and the vinyl monomer in the composite rubber-based graft copolymer (C) is based on the mass of the composite rubber-based graft copolymer (C).
To 95% by mass, preferably 40 to 90% by mass, and 5 to 70% by mass, preferably 10 to 60% by mass of a vinyl monomer.
Is preferred. If the amount of the vinyl monomer is less than 5% by mass, the dispersion of the graft copolymer (C) in the resin composition is not sufficient, and if it exceeds 70% by mass, the impact strength developability is undesirably reduced.

The composite rubber-based graft copolymer (C) is a composite rubber-based graft copolymer obtained by adding the above-mentioned vinyl monomer to a composite rubber latex and polymerizing it in one step or in multiple steps by a radical polymerization technique. The latex can be separated and recovered by throwing it into hot water in which a metal salt such as calcium chloride or magnesium sulfate is dissolved, salting out and coagulating.

The effect of the composite rubber-based graft copolymer (C) used in the present invention not only improves the impact strength but also has the effect of suppressing a decrease in the molecular weight of the aromatic polycarbonate resin (A). The effect is that the composite rubber-based graft copolymer (C) has a higher affinity for the titanium oxide (B) than the aromatic polycarbonate resin (A), and the aromatic polycarbonate resin (A) and the titanium oxide are melt-kneaded. This is considered to be due to the reduction in the contact area with (B).

The compounding ratio of the composite rubber graft copolymer (C) used in the present invention is 0.5 to 30 parts by mass, preferably 1 to 30 parts by mass, per 100 parts by mass of the aromatic polycarbonate resin (A). 20 parts by mass. If the amount is less than 0.5 part by mass, the mechanical properties (particularly, impact strength) are insufficient, and the effect of suppressing a decrease in molecular weight is insufficient. If it exceeds 30 parts by mass, heat resistance and rigidity will be reduced.

The flame retardant (D) used in the present invention is not particularly limited as long as it has the effect of improving the flammability within the range of the effect of the present invention. / Or phosphate ester flame retardant and /
Alternatively, it is selected from organic sulfonates. Examples of the halogen-based flame retardant include aromatic halogen compounds, halogenated epoxy resins, halogenated polycarbonate resins, halogenated aromatic vinyl polymers, halogenated cyanurate resins, halogenated polyphenyl ethers, halogenated polyphenylthioethers, and the like. Preferably, decabromodiphenyl oxide, brominated bisphenol-based epoxy resin, brominated bisphenol-based phenoxy resin, brominated bisphenol-based polycarbonate resin, brominated polystyrene resin, brominated cross-linked polystyrene resin, brominated bisphenol cyanurate resin, brominated Polyphenylene oxide, polydibromophenylene oxide, decabromodiphenyl oxide bisphenol condensate (tetrabromobisphenol A, its oligo Chromatography, or the like). Further, as the phosphate ester-based flame retardant, a phosphate ester or an oligomeric phosphate ester can be used. Examples of the phosphoric acid ester include a phosphoric acid ester obtained by reacting an alcohol or a phenol compound with a phosphorus compound such as phosphorus oxychloride or phosphorus pentachloride,
At this time, a divalent phenol compound (for example, resorcinol,
Hydroquinone, diphenol compounds)
An oligomeric phosphate ester is obtained. Specific examples of the phosphoric ester flame retardants include trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxycotyl phosphate, triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate, and the like. Non-halogen phosphate, tris (chloroethyl) phosphate, tris (dichloropropyl) phosphate, bis (2,3 dibromopropyl) 2,3-dichloropropylphosphate, tris (2,3-dibromopropyl) phosphate, bis (chloropropyl) ) Halogen-containing phosphoric acid esters such as monooctyl phosphate. Examples of the organic metal sulfonate include potassium perfluorobutanesulfonate, potassium trichlorobenzenesulfonate, potassium diphenylsulfon-3-sulfonate, and the like.

The modified polytetrafluoroethylene (E) used in the present invention has a polytetrafluoroethylene content of 0.5 to 80% by mass of the total mass and a particle size of 10 μm.
The following polytetrafluoroethylene particles and an organic polymer are used.
It is necessary that the aggregates have no size of 0 μm or more.
As such a polytetrafluoroethylene-containing mixed powder, an aqueous dispersion of polytetrafluoroethylene particles having a particle diameter of 0.05 to 1.0 μm and an aqueous dispersion of organic polymer particles are mixed, and solidified or mixed. What is obtained by pulverization by spray drying, after polymerizing the monomer constituting the organic polymer in the presence of an aqueous dispersion of polytetrafluoroethylene particles having a particle diameter of 0.05 to 1.0 μm, coagulation Or a dispersion obtained by pulverization by spray drying, or a dispersion obtained by mixing an aqueous dispersion of polytetrafluoroethylene particles having a particle diameter of 0.05 to 1.0 μm and an aqueous dispersion of organic polymer particles. It is preferably obtained by subjecting a monomer having an ethylenically unsaturated bond to emulsion polymerization, and then coagulating or spray-drying to obtain a powder.

The particle size of 0.05 to 5 used for obtaining the modified polytetrafluoroethylene (E) according to the present invention.
The aqueous dispersion of 1.0 μm polytetrafluoroethylene particles is obtained by polymerizing a tetrafluoroethylene monomer by emulsion polymerization using a fluorinated surfactant. At the time of emulsion polymerization of polytetrafluoroethylene particles, as long as the properties of polytetrafluoroethylene are not impaired, hexafluoropropylene, chlorotrifluoroethylene, fluoroalkylethylene, perfluoroalkylvinylether and other fluorinated olefins as copolymerization components And fluorinated alkyl (meth) acrylates such as perfluoroalkyl (meth) acrylate. The content of the copolymer component is preferably 10% by mass or less based on the mass of tetrafluoroethylene.

Aqueous dispersions of polytetrafluoroethylene particles are commercially available, "Fluon AD-1", "Fluon AD-936", manufactured by Asahi ICI Fluoropolymer Co., Ltd.
Representative examples include "Polyflon D-1" and "Polyflon D-2" manufactured by Daikin Industries, and "Teflon 30J" manufactured by Mitsui Dupont Fluorochemicals. The organic polymer constituting the modified polytetrafluoroethylene (E) in the present invention is not particularly limited. Is preferably high in affinity.

Specific examples of the monomer for producing such an organic polymer include styrene, α-methylstyrene,
p-methylstyrene, o-methylstyrene, t-butylstyrene, o-ethylstyrene, p-chlorostyrene,
o-chlorostyrene, 2,4-dichlorostyrene, p-
Aromatic vinyl monomers such as methoxystyrene, o-methoxystyrene, and 2,4-dimethylstyrene; methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, acrylic acid -2-ethylhexyl, methacrylic acid-
(Meth) acrylate monomers such as 2-ethylhexyl, dodecyl acrylate, dodecyl methacrylate, tridecyl acrylate, tridecyl methacrylate, octadecyl acrylate, octadecyl methacrylate, cyclohexyl acrylate, and cyclohexyl methacrylate;
Vinyl cyanide monomers such as acrylonitrile and methacrylonitrile; α, β-unsaturated carboxylic acids such as maleic anhydride; maleimide monomers such as N-phenylmaleimide, N-methylmaleimide and N-cyclohexylmaleimide Glycidyl group-containing monomers such as glycidyl methacrylate; vinyl ether monomers such as vinyl methyl ether and vinyl ethyl ether; vinyl carboxylate monomers such as vinyl acetate and vinyl butyrate; ethylene, propylene, isobutylene and the like Olefin-based monomers; and diene-based monomers such as butadiene, isoprene, and dimethylbutadiene. These monomers can be used alone or as a mixture of two or more.

Among these monomers, from the viewpoint of dispersibility in the above aromatic polycarbonate resin composition, that is, from the viewpoint of flame retardancy and molded appearance, aromatic vinyl monomers and (meth) acrylic monomers are preferred. Acid ester monomers and vinyl cyanide monomers can be mentioned. The content of polytetrafluoroethylene in the modified polytetrafluoroethylene (E) according to the present invention is 0.5% based on the total mass.
5 to 80% by mass. If the amount is less than 0.5% by mass, the anti-dripping effect is insufficient, and if it exceeds 80% by mass, the dispersibility is poor and the surface appearance is insufficient.

The modified polytetrafluoroethylene (E) according to the present invention is prepared by charging an aqueous dispersion thereof into hot water in which metal salts such as calcium chloride and magnesium sulfate are dissolved,
After salting out and coagulating, it can be dried or powdered by spray drying. Although ordinary polytetrafluoroethylene fine powder becomes an aggregate of 100 μm or more in the step of recovering as a powder from the state of a particle dispersion, it is difficult to uniformly disperse it in an aromatic polycarbonate resin. On the other hand, the modified polytetrafluoroethylene (E) according to the present invention has extremely excellent dispersibility in an aromatic polycarbonate resin because polytetrafluoroethylene alone does not form a domain having a particle diameter of more than 10 μm. As a result, in the modified polytetrafluoroethylene of the present invention, the polytetrafluoroethylene is efficiently fiberized in the polycarbonate resin composition, and has excellent anti-dripping properties and excellent surface properties.

The proportion of the modified polytetrafluoroethylene (E) used in the present invention is 0.1 to 8 parts by mass, preferably 0.2 to 8 parts by mass, per 100 parts by mass of the aromatic polycarbonate resin (A). 4 parts by mass. If the amount is less than 0.1 part by mass, the anti-dripping property is insufficient, and the effect of imparting flame retardancy is insufficient. When the amount exceeds 8 parts by mass, the surface appearance is remarkably deteriorated.

The aromatic polycarbonate resin composition of the present invention is produced by mixing the above components. For example, each component is charged into a V-blender, a ribbon mixer, a tumbler, or the like, uniformly mixed, melted and kneaded with a single-screw or twin-screw ordinary extruder, cooled, and cut into pellets. At this time, a filler such as titanium oxide or a part of other components may be added in the middle of the extruder. Alternatively, after some of the components are previously mixed and kneaded, the remaining components may be added and extruded.

The aromatic polycarbonate resin composition of the present invention may contain other resins such as polyester, polyamide, ABS, polyphenylene ether and the like, for example, talc, mica, glass fiber, carbon fiber, and the like, without impairing the object of the present invention. It is also possible to add a reinforcing agent such as whiskers (fibrous titanium oxide, potassium titanate whisker, aluminum borate whisker, etc.). The aromatic polycarbonate resin composition of the present invention may contain various additives in an amount that exerts its effect, if necessary, such as phosphites and phosphates as stabilizers, and hinder phenol compounds as antioxidants. Or a fluidity modifier such as polycaprolactone, a release agent, an ultraviolet absorber, an antistatic agent, a dye or pigment, or the like.

The resin composition thus obtained can be easily molded by methods such as extrusion molding, injection molding, and compression molding, and can also be applied to blow molding, vacuum molding, and the like. Most suitable as a material for the light reflector.

[0043]

The present invention will be described in more detail with reference to the following examples. In the examples and comparative examples, “parts” and “%” mean “parts by mass” and “% by mass”, respectively. The measurement of each characteristic value was obtained by the following method.

(1) Solid content concentration: 170 ° C. of the particle dispersion
And dried for 30 minutes. (2) Particle size distribution, weight average particle size: A particle dispersion diluted with water was used as a sample liquid and subjected to dynamic light scattering (ELS800, manufactured by Otsuka Electronics Co., Ltd., temperature 25 ° C., scattering angle 90 °). It was measured. (3) Surface potential: 0.01 mol / l of N
The solution diluted with the aCl aqueous solution was used as a sample solution and measured by electrophoresis (ELS800, manufactured by Otsuka Electronics Co., Ltd., temperature: 25 ° C., scattering angle: 10 °). (4) Impact strength: A test piece was molded using a 75-t injection molding machine and evaluated based on ASTM D256. (Thickness:
(1/8 inch, unit J / m) (5) Deflection temperature under load: A test piece was molded using a 75-t injection molding machine and evaluated based on ASTM D-648.
(Load: 18.5 kgf / cm2, unit ° C) (6) Light reflectance: spectrophotometer (U, manufactured by Hitachi, Ltd.)
-3500), and the Y value at a wavelength of 400 to 800 nm was measured. Those that are 92% or more are accepted. (7) Combustion test: A test piece was molded using a 75 t injection molding machine and evaluated based on UL Standard 94-V plastic combustion test method. (Thickness: 1/16 inch) (8) Surface appearance: A test piece was molded using a 75t injection molding machine, and the surface appearance of the molded product was visually evaluated according to the following criteria. (Thickness: 1/16 inch) ○: Smooth and good appearance △: Slight surface roughness is observed ×: Surface roughness is severe and appearance is poor

[Examples 1 to 12 and Comparative Examples 1 to 7] An aromatic polycarbonate resin (component A) was dried at 120 ° C for 5 hours, and then titanium oxide (component B) and a rubbery polymer (component C) were added thereto. ) And various flame retardants (component (D)) and modified polytetrafluoroethylene (component (E)) in the amounts described in Tables 1 and 2,
And 0.1 part by mass of a phosphorus-based stabilizer (trimethyl phosphate: TMP manufactured by Daihachi Chemical Industry Co., Ltd.) with respect to 100 parts by mass of the aromatic polycarbonate resin (A component), and then mixed by a blender. The mixture was extruded with a vented twin-screw extruder at a cylinder temperature of 280 ° C. while being deaerated, and pelletized. The obtained pellets were dried by a hot air circulating drier at 120 ° C for 6 hours, and then a sample plate, a test piece for measuring impact strength and load deflection temperature at a cylinder temperature of 280 ° C and a mold temperature of 80 ° C by a 75t injection molding machine. Combustion test specimens were formed. The test piece and the combustion test piece for measuring the impact strength and the deflection temperature under load were subjected to condition adjustment at 23 ° C. and 50% RH for 48 hours after molding, and then subjected to the measurement. Table 1 shows the results.
No. 2. In addition, the symbol which shows each component of Table 1 and 2 is as follows.

Aromatic polycarbonate resin (A component) (A-1) Bisphenol A type polycarbonate: NOVAREX 7022A; manufactured by Mitsubishi Engineering-Plastics Co., Ltd. Titanium oxide (B component) (B-1) Titanium oxide: CR -93; Ishihara Sangyo Co., Ltd.
Manufacture, crystal system = rutile, manufacturing method = chlorine method, main treating agent = alumina / silica (B-2) titanium oxide: PC-2; manufactured by Ishihara Sangyo Co., Ltd.
Crystal system = rutile, Production method = Chlorine method, Main treatment agent = Alumina, silica, methyl hydrogen polysiloxane

Rubbery Polymer (Component C) (C-1) Silicone / acrylic composite rubber-based graft copolymer: prepared as follows. A mixture of 2 parts of tetraethoxysilane, 0.5 part of γ-methacryloyloxypropyldimethoxymethylsilane and 97.5 parts of octamethylcyclotetrasiloxane was mixed to give a siloxane mixture 180.
Got a part. 100 parts of the above mixed siloxane was added to 200 parts of distilled water in which 1 part of sodium dodecylbenzenesulfonate and 1 part of dodecylbenzenesulfonic acid were dissolved, and the mixture was preliminarily stirred at 10,000 rpm with a homomixer, and then at a pressure of 300 kg / cm2 with a homogenizer. Emulsification and dispersion were performed to obtain an organosiloxane latex. The mixed solution was transferred to a separable flask equipped with a condenser and a stirring blade, heated at 80 ° C. for 5 hours while stirring and mixing, and allowed to stand at 20 ° C. After 48 hours, the pH of the latex was adjusted to 6 with an aqueous sodium hydroxide solution. 9.9, and the polymerization was completed to obtain polyorganosiloxane rubber latex-1. The degree of polymerization of the obtained polyorganosiloxane rubber is 8
9.7%, and the average particle size of the polyorganosiloxane rubber was 0.16 μm. 100 parts of the above polyorganosiloxane rubber latex-1 was collected and placed in a separable flask equipped with a stirrer, 120 parts of distilled water was added, the atmosphere was replaced with nitrogen, the temperature was raised to 50 ° C, and n-butyl acrylate 37. 5 parts, 2.5 parts of allyl methacrylate and
A mixture of 0.3 part of tert-butyl hydroperoxide was charged and stirred for 30 minutes, and the mixture was permeated into the polyorganosiloxane rubber particles. Then ferrous sulfate 0.00
03 parts, ethylenediaminetetraacetic acid disodium salt 0.0
A mixture of 01 parts, 0.17 parts of Rongalite and 3 parts of distilled water was charged to start radical polymerization.
For 2 hours to complete the polymerization to obtain a composite rubber latex. A part of this latex was collected, and the average particle size of the composite rubber was measured to be 0.19 μm. The latex was dried to obtain a solid, which was then heated at 90 ° C.
Extraction was performed for 2 hours, and the gel content was measured to be 90.3%. To this composite rubber latex, a mixture of 0.3 part of tert-butyl hydroperoxide, 9 parts of acrylonitrile and 21 parts of styrene was added dropwise at 70 ° C. for 45 minutes, and then kept at 70 ° C. for 4 hours to form a composite rubber. The graft polymerization of was completed. The polymerization rate of the obtained graft copolymer was 98.6%. This graft copolymer latex is dropped into hot water of 5% calcium chloride to coagulate, separate, wash, and then dried at 75 ° C. for 16 hours to obtain a composite rubber-based graft copolymer C-1. Was.

(C-2) MBS resin: 150 parts of deionized water, 1,3 butadiene 85 in a pressure-resistant autoclave.
Parts, styrene 15 parts, t-dodecyl mercaptan 0.5
Parts, diisopropylbenzene hydroperoxide 0.4
Parts, 1.5 parts of sodium pyrophosphate, 0.02 parts of ferrous sulfate,
Dextrose 1.0 part, potassium oleate 1.0
The mixture was stirred and reacted at 50 ° C. for 15 hours with stirring to produce a butadiene rubber polymerized latex. The above butadiene rubber polymerized latex was charged into a flask (65 parts (as solid content)) and purged with nitrogen.
Was added as a 10% aqueous solution and stirred for 30 minutes. After stabilizing by adding 1 part of potassium oleate as a 7% aqueous solution, 0.6 part of Rongalite was added,
While maintaining the internal temperature at 70 ° C., a monomer mixture 3 having the following composition was prepared.
Five parts were graft-polymerized. All graft monomer mixture is 1
The first stage of grafting was 40 parts by weight of methyl methacrylate, 5 parts by weight of acrylic SAN ethyl, and 0.1 part by weight of tert-butyl hydroperoxide (t-BH).
Of the monomer mixture was added dropwise over 1 hour, and the mixture was polymerized for 2 hours with stirring. Thereafter, as a second stage of grafting, a mixture of 40 parts of styrene and 0.1 part of t-BH was added dropwise over 1 hour, and polymerization was carried out for 2 hours with stirring. Graft 3
As a stage, 15 parts of methyl methacrylate and t-BH0.
05 parts of the monomer mixture was added dropwise over 1 hour and polymerized for 2 hours with stirring to obtain an MBS resin latex. After adding 0.5 parts of BHT to the obtained graft copolymer latex, an aqueous solution of 0.2% by mass of sulfuric acid was added to cause coagulation.
Heat treated and solidified at 90 ° C. Thereafter, the coagulated product was washed with warm water and dried to obtain an MBS resin (C-2) powder.

(C-3) Acrylic graft copolymer:
To a separable flask equipped with a stirrer, 195 parts of distilled water and 0.1 part of sodium dodecylbenzenesulfonate were added, the atmosphere was replaced with nitrogen, and the temperature was raised to 50 ° C. Then, 0.002 parts of ferrous sulfate, ethylenediamine A mixed solution of 0.006 parts of disodium tetraacetate, 0.26 parts of Rongalit and 5 parts of distilled water was charged, and 70 parts of n-butyl acrylate substituted with nitrogen, 0.75 parts of allyl methacrylate and 0.7 parts of tert-butyl hydroperoxide were added. 4 parts of the mixture was charged, radical polymerization was started, and then the internal temperature was 7
It was kept at 0 ° C. for 2 hours to complete the polymerization to obtain a rubber latex. A part of this latex was collected and the average particle diameter was measured to be 0.22 μm. A mixture of 0.06 part of tert-butyl hydroperoxide and 30 parts of methyl methacrylate was added to this rubber latex at 70 ° C. for 1 hour.
Dropwise over 5 minutes, then hold at 70 ° C. for 4 hours,
Graft polymerization to rubber was completed to obtain an acrylic graft copolymer (C-3) latex. The polymerization rate of methyl methacrylate was 98.2%, and the average particle size was 0.24 μm. The obtained graft copolymer latex was dropped into 200 parts of hot water containing 1.5% of calcium chloride, coagulated, separated, washed, and dried at 75 ° C. for 16 hours to obtain an acrylic graft copolymer powder. .

Flame retardant (D component) (D-1) Triphenyl phosphate: TPP; manufactured by Daihachi Chemical Industry Co., Ltd. (D-2) Oligomeric phosphate: PX-20
0; manufactured by Daihachi Chemical Industry Co., Ltd. (D-3) Brominated epoxy resin: Pratherm EP-1
00; manufactured by Dainippon Ink and Chemicals, Inc.

Polytetrafluoroethylene (component E) (E-1) Polytetrafluoroethylene-containing powder: 190 parts of distilled water, dodecylbenzene in a separable flask equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet. 1.5 parts of sodium sulfonate, 100 parts of styrene, and 0.5 part of cumene hydroperoxide were charged, and the mixture was added under nitrogen flow.
The temperature was raised to 0 ° C. Next, 0.001 part of iron (II) sulfate,
A mixed solution of 0.003 part of disodium ethylenediaminetetraacetate, 0.24 part of Rongalit salt and 10 parts of distilled water was added to initiate radical polymerization. After the end of the heat generation, the temperature in the system was maintained at 40 ° C. for 1 hour to complete the polymerization to obtain a styrene polymer particle dispersion (hereinafter referred to as P-1). P
The solid concentration of -1 was 33.3%, the particle size distribution showed a single peak, the weight average particle size was 96 nm, and the surface potential was -32 mV. On the other hand, Fluon AD936 manufactured by Asahi ICI Fluoropolymers was used as a polytetrafluoroethylene-based particle dispersion. AD936 has a solids concentration of 63.0% and polytetrafluoroethylene 100%.
5 parts by weight of polyoxyethylene alkylphenyl ether. The particle size distribution of AD936 showed a single peak, the weight average particle size was 290 nm, and the surface potential was -20 mV. To 833 parts of AD936, 1167 parts of distilled water was added to obtain a polytetrafluoroethylene particle dispersion F-1 having a solid content concentration of 26.2%. F
-1 is 25% polytetrafluoroethylene particles and 1.
It contains 2% of polyoxyethylene nonylphenyl ether. 160 parts of F-1 (40 parts of polytetrafluoroethylene) and 181.8 parts of P-1 (60 parts of polystyrene) were charged into a separable flask equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet, The mixture was stirred at room temperature for 1 hour under a nitrogen stream. Thereafter, the inside of the system was heated to 80 ° C. and maintained for 1 hour. No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. The solid content concentration of the particle dispersion was 29.3%, the particle size distribution was relatively broad, and the weight average particle size was 168 nm. 341.8 parts of this particle dispersion liquid is put into 700 parts of 85 ° C. hot water containing 5 parts of calcium chloride, and the solid is separated, filtered and dried to obtain a mixed powder containing polytetrafluoroethylene (E-1). 9
8 parts were obtained. After the polytetrafluoroethylene-containing mixed powder (E-1) was shaped into a strip at 250 ° C. by a press molding machine, ultrathin sections were observed with a microtome without staining using a transmission electron microscope. Polytetrafluoroethylene was observed as a dark part, but no aggregate larger than 10 μm was observed.

(E-2) Polytetrafluoroethylene-containing mixed powder: Used in the preparation of (E-1) above in a separable flask equipped with a stirring blade, a condenser, a thermocouple, a nitrogen inlet, and a dropping funnel. 160 parts of F-1 (40 parts of polytetrafluoroethylene), 1.0 part of dodecylbenzenesulfonic acid, and 70 parts of distilled water were charged, and the temperature was raised to 80 ° C. under a nitrogen stream. Then, iron (II) sulfate 0.001
Parts, disodium ethylenediaminetetraacetate 0.003
, A mixture of 20 parts of Rongalite salt and 10 parts of distilled water was added, and a mixture of 20 parts of n-butyl acrylate, 40 parts of styrene and 0.3 part of tertiary butyl peroxide was added from a dropping funnel for 90 minutes. After the dropwise addition, radical polymerization was allowed to proceed. After the completion of the dropwise addition, the internal temperature was maintained at 80 ° C. for 1 hour. No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. The solids concentration of the particle dispersion is 33.
2%, the particle size distribution was relatively broad, and the weight average particle size was 248 nm. 301.5 parts of this particle dispersion is charged into 700 parts by mass of 85 ° C. hot water containing 5 parts of calcium chloride, and the solid is separated, filtered and dried to obtain a mixed powder of polytetrafluoroethylene (E-2). ) 98 parts were obtained.
After the polytetrafluoroethylene-containing mixed powder (E-2) was shaped into strips at 250 ° C. by a press molding machine, ultrathin sections were observed with a microtome without staining using a transmission electron microscope. Polytetrafluoroethylene was observed as a dark part, but no aggregate larger than 10 μm was observed.

(E-3) Mixed powder containing polytetrafluoroethylene: 0.1 part of azobisdimethylvaleronitrile was dissolved in a mixed solution of 75 parts of dodecyl methacrylate and 25 parts of methyl methacrylate. A mixture of 2.0 parts of sodium dodecylbenzenesulfonate and 300 parts of distilled water was added to the mixture, and the mixture was added at 4 ° C with a homomixer at 10,000 rpm.
After stirring for 2 minutes, the mixture was passed twice through a homogenizer at a pressure of 30 MPa to obtain a stable dodecyl methacrylate / methyl methacrylate preliminary dispersion. This was charged into a separable flask equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet, the internal temperature was raised to 80 ° C. under a nitrogen stream, and the mixture was stirred for 3 hours to undergo radical polymerization, and dodecyl methacrylate / methyl Methacrylate copolymer particle dispersion (hereinafter referred to as P-
2). The solid concentration of P-2 is 25.1%
, The particle size distribution showed a single peak, the weight average particle size was 198 nm, and the surface potential was -39 mV. 160 parts (40 parts of polytetrafluoroethylene) of F-1 used in the preparation of (E-1) and 159.4 parts of P-2
(Dodecyl methacrylate / methyl methacrylate copolymer, 40 parts) was charged into a separable flask equipped with a stirring blade, a condenser, a thermocouple, a nitrogen inlet, and a dropping funnel, and stirred at room temperature for 1 hour under a nitrogen stream. Then 8 in the system
The temperature was raised to 0 ° C., and a mixed solution of 0.001 part of iron (II) sulfate, 0.003 part of disodium ethylenediaminetetraacetate, 0.24 part of Rongalite salt and 10 parts of distilled water was added, and 20 parts of methyl methacrylate was added. A mixture of 0.1 part of tert-butyl peroxide and 0.1 part of tertiary butyl peroxide was added dropwise over 30 minutes. After completion of the addition, the internal temperature was maintained at 80 ° C. for 1 hour to complete the radical polymerization. No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. The solids concentration of the particle dispersion is 2
At 8.5%, the particle size distribution was relatively broad and the weight average particle size was 248 nm. This particle dispersion liquid 349.7
The mixture was poured into 600 parts of 75 ° C. hot water containing 5 parts of calcium chloride, and the solid was separated, filtered and dried to obtain 97 parts of a polytetrafluoroethylene-containing mixed powder (E-3). After the dried polytetrafluoroethylene-containing mixed powder (E-3) was shaped into strips at 220 ° C. by a press molding machine, ultrathin sections were observed with a microtome without transmission using a transmission electron microscope. did. Polytetrafluoroethylene was observed as a dark part, but no aggregate exceeding 10 μm was observed.

(E-4) Polytetrafluoroethylene:
Polyflon TFE F-201L; Daikin Industries, Ltd.
Made

[0055]

[Table 1]

[0056]

[Table 2]

[0057]

According to the aromatic polycarbonate resin composition of the present invention, high light reflection characteristics can be obtained without impairing the inherent characteristics of the aromatic polycarbonate resin such as mechanical properties, dimensional stability and heat resistance. A molded article such as a reflection plate which can exert its effects and exhibits excellent flame retardancy and excellent molded appearance can be obtained. Therefore, it is possible to provide a product that requires high appearance and flame retardancy while coping with the reduction in weight and thickness of the product. Therefore, it is possible to realize a reflective material in which the resin molded product itself has high reflectivity at low cost without plating the resin molded product. Further, the composite rubber-based graft copolymer (C) has an average particle size of the composite rubber of 0.5.
When the thickness is from 08 to 0.6 μm, both the impact resistance and the surface appearance of the molded product can be enhanced in higher dimensions.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 27:18) C08L 27:18) (72) Inventor Masahiro Osuga 3816 Nototo, Tama-ku, Kawasaki-shi, Kanagawa Prefecture Mitsubishi Rayon Co., Ltd. Tokyo Technology & Information Center F term (reference) 4F071 AA27 AA33 AA50 AA67 AA77 AE07 BC07 4J002 BD154 BN123 BN172 CD125 CG011 CG035 CH075 DE136 EV237 EW047 EW057 FA082 FA083 FA084 FB126 FB146 FD135 FD135

Claims (3)

[Claims] (A) Aromatic polycarbonate resin: 1
(B) titanium oxide: 5 to 80 parts by mass, (C) 10 to 90% by mass of a polyorganosiloxane rubber component, and 90 to 90 parts by mass of a polyalkyl (meth) acrylate rubber component.
A composite rubber-based graft copolymer obtained by graft-polymerizing one or two or more vinyl monomers onto a composite rubber having a structure in which 10% by mass (the total amount thereof is 100% by mass) is entangled with each other: 0.5 to 30 parts by mass, (D) a flame retardant: 2 to 30 parts by mass, and (E) a polytetrafluoroethylene content of 0.5 to 80% by mass based on the total amount, and a particle diameter of 10 μm or less. An aromatic polycarbonate resin composition comprising 0.1 to 8 parts by mass of a modified polytetrafluoroethylene comprising polytetrafluoroethylene particles and an organic polymer. 2. The composite rubber-based graft copolymer (C)
2. The aromatic polycarbonate according to claim 1, wherein the composite rubber comprising a polyorganosiloxane rubber component and a polyalkyl (meth) acrylate rubber component has an average particle diameter of 0.08 to 0.6 [mu] m. Resin composition. 3. A molded article characterized by being molded using the aromatic polycarbonate resin composition according to claim 1.