JPH07207136A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain a thermoplastic resin composition containing an aromatic polycarbonate, a rubber-reinforced thermoplastic resin, a styrene-based resin, a specific phosphorus compound and polytetrafluoroethylene, etc., excellent in flame retardance, heat resistance and impact resistance and useful for OA equipment parts, etc. CONSTITUTION:This composition contains (A) 20-95wt.%, preferably 60-90wt.% of an aromatic polycarbonate (preferably obtained by reaction of bisphenol A with phosgene), (B) 80-5wt.%, preferably 40-10wt.% of a thermoplastic resin obtained by subjecting an aromatic vinyl compound (preferably styrene or alpha- methylstyrene) or the aromatic vinyl compound and other vinyl monomer [e.g. (meth)acrylonitrile] copolymerizable with the aromatic vinyl compound to graft polymerization in the presence of a rubber-based polymer, (C) 0-75wt.% of a styrene-based resin obtained by polymerizing an aromatic vinyl compound or copolymerizing the aromatic vinyl compound with other vinyl monomer copolymerizable with the aromatic vinyl compound, (D) 1-30 pts.wt. of a compound of the formula based on 100 pts.wt. of these components A+B+C and (E) 0-20 pts.wt. of polytetrafluoroethylene.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a thermoplastic resin composition having excellent flame retardancy, heat resistance and impact resistance.

[0002]

2. Description of the Related Art A flame-retardant resin obtained by blending a halogen-based flame retardant in a polymer alloy made of ABS resin and aromatic polycarbonate is excellent in impact resistance, heat resistance, surface appearance of molded products, and molding processability. Widely used in various fields. However, in recent years, materials using phosphorus-based flame retardants have been investigated because of the environmental impact of resins containing halogen-based flame retardants. Triphenyl phosphate is a commonly used phosphorus flame retardant,
Flame retardant when using triphenyl phosphate,
There is a problem of poor heat resistance and impact resistance.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is a thermoplastic resin composition excellent in flame retardancy, heat resistance and impact resistance, which can be used in a wide range of applications. The purpose is to provide.

[0004]

The present invention relates to (A) 20 to 95% by weight of an aromatic polycarbonate, (B) an aromatic vinyl compound or an aromatic vinyl compound and an aromatic vinyl compound in the presence of a rubbery polymer. Thermoplastic resin 80 obtained by graft-polymerizing another copolymerizable vinyl monomer
Styrene resins 0 to 7 obtained by polymerizing 5% by weight of (C) an aromatic vinyl compound or an aromatic vinyl compound and another vinyl monomer copolymerizable with the aromatic vinyl compound.
5% by weight, (D) at least 1 represented by the following general formula with respect to 100 parts by weight of the above components (A) + (B) + (C).
1 to 30 parts by weight of the compound of the species,

[0005]

[Chemical 2]

(In the formula, R ₁ and R ₂ are alkyl groups having 1 to 5 carbon atoms, R ₃ is an alkyl group having 1 to 6 carbon atoms, and n is an integer of 0 to _3. ) (E) Polytetrafluoroethylene ( The present invention provides a thermoplastic resin composition comprising 0 to 20 parts by weight of at least one selected from E-1) and a phenolic resin (E-2).

The aromatic polycarbonate as the component (A) used in the present invention is obtained by the reaction of various dihydroxyaryl compounds with phosgene or by the transesterification reaction of the dihydroxyaryl compounds with diphenyl carbonate. There are things. A typical example is a polycarbonate obtained by the reaction of 2,2'-bis (4-hydroxyphenyl) propane and phosgene. As a dihydroxyaryl compound which is a raw material of polycarbonate, bis (4-
Hydroxyphenyl) methane, 1,1'-bis (4-hydroxyphenyl) ethane, 2,2'-bis (4-hydroxyphenyl) propane, 2,2'-bis (4-hydroxyphenyl) butane, 2,2 ′ -Bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2′-bis (4-hydroxy-3-methylphenyl) propane, 2,2′-bis (4
-Hydroxy-3-tert-butylphenyl) propane,
2,2'-bis (4-hydroxy-3-promophenyl) propane, 2,2'-bis (4-hydroxy-3,
5-dichlorophenyl) propane, 1,1'-bis (4
-Hydroxyphenyl) cyclopentane, 1,1'-bis (4-hydroxyphenyl) cyclohexane, 4,
4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether,
4,4'-dihydroxyphenyl sulfide, 4,4 '
-Dihydroxy-3,3'-dimethylphenyl sulfide, 4,4'-dihydroxyphenyl sulfide, 4,
4'-dihydroxy-3,3'-dimethylphenyl sulfide, 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxy-3,3'-dimethylphenyl sulfoxide, 4,4'-dihydroxyphenyl sulfone, 4, There are 4'-dihydroxy-3,3'-dimethyldiphenyl sulfone, hydroxy, resorcin and the like, and these are used alone or in combination of two or more. Particularly preferred is 2,2'-bis (4-hydroxyphenyl) propane {bisphenol A}.

The viscosity average molecular weight of the polycarbonate is preferably 15,000 to 40,000, more preferably 17,000 to 35,000. The amount of the component (A) used is 20 to 9 in the components (A) + (B) + (C) of the present invention.
It is 5% by weight, preferably 30 to 95% by weight, more preferably 50 to 95% by weight, particularly preferably 60 to 90% by weight. If the amount used is less than 20% by weight, flame retardancy is not exhibited, and heat resistance and impact resistance are poor. If it exceeds 95% by weight, the impact resistance is poor.

Examples of the rubbery polymer used as the component (B) of the present invention include polybutadiene, polyisoprene, butyl rubber, styrene-butadiene copolymer (styrene content of 5 to 60% by weight is preferable), styrene-isoprene. Copolymer, acrylonitrile-butadiene copolymer, ethylene-α-olefin copolymer, ethylene-α
-Olefin-polyene copolymer, silicone rubber, acrylic rubber, butadiene- (meth) acrylic acid ester copolymer, polyisoprene, styrene-butadiene block copolymer, styrene-isoprene block copolymer,
Examples thereof include hydrogenated styrene-butadiene block copolymers, hydrogenated butadiene-based polymers, ethylene-based ionomers and the like. Further, the styrene-butadiene block copolymer and the styrene-isoprene block copolymer include AB
Type, ABA type, taper type, and radial teleblock type structures are included. Further, the hydrogenated butadiene-based polymer is a hydride of the block copolymer of the styrene block and the styrene-butadiene random copolymer in addition to the hydride of the block copolymer, and the content of 1,2-vinyl bond in polybutadiene. Of 20% by weight or less and a hydride of a polymer comprising a polybutadiene block having a 1,2-vinyl bond content of more than 20% by weight.

The aromatic vinyl compound used here is styrene, t-butylstyrene, α-methylstyrene, p-methylstyrene, civinylbenzene, 1,1.
-Diphenylstyrene, N, N-diethyl-P-aminoethylstyrene, N, N-diethyl-P-aminomethylstyrene, vinylpyridine, vinylxylene, monochlorostyrene, dichlorostyrene, monobromostyrene,
Dibromostyrene, fluorostyrene, ethylstyrene, vinylnaphthalene, and the like, particularly styrene,
α-Methylstyrene is preferred. These aromatic vinyls may be used alone or in combination of two or more.

The vinyl monomer copolymerizable with the aromatic vinyl compound includes vinyl cyan compounds such as acrylonitrile and methacrylonitrile, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, amino acrylate, hexyl acrylate, octyl. Acrylate ester such as acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, dodecyl acrylate, octadecyl acrylate, phenyl acrylate, benzyl acrylate, methyl methacrylate, ethyl methacrylate,
Propyl methacrylate, butyl methacrylate, amino methacrylate, hexyl methacrylate, octyl methacrylate, 2-ethylhexyl methacrylate,
Cyclohexyl methacrylate, dodecyl methacrylate, octadecyl methacrylate, phenyl methacrylate, methacrylic acid esters such as benzyl methacrylate, maleic anhydride, itaconic anhydride, acid anhydride group-containing unsaturated compound such as citraconic anhydride, maleimide,
N-methylmaleimide, N-butylmaleimide, N-
Maleimide compounds of unsaturated dicarboxylic acids such as (P-methylphenyl) maleimide, N-phenylmaleimide, N-cyclohexylmaleimide, unsaturated epoxy compounds such as glycidyl methacrylate and allyl glycidyl ether, unsaturated carboxylic acids such as acrylamide and methacrylamide. Amino group-containing unsaturated compounds such as acid amide, acrylic amine, aminomethyl methacrylate, aminoethyl methacrylate, aminopropyl methacrylate, aminostyrene, hydroxystyrene, 3-hydroxy-
1-propene, 4-hydroxy-1-butene, cis-4
-Hydroxy-2-butene, trans-4-hydroxy-2-butene, 3-hydroxy-2-methyl-1-propene, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate and other hydroxyl group-containing unsaturated compounds, acrylic acid , Unsaturated acids such as methacrylic acid, itaconic acid, maleic acid and the like, and oxazoline group-containing unsaturated compounds such as vinyl oxazoli, etc., and one kind of the above monomer copolymerizable with these aromatic vinyl compounds or Two or more kinds can be used in combination.

The amount of the component (B) used in the present invention is 80 to 5% by weight, preferably 70 to 5% by weight, more preferably 50 to 50% by weight in the components (A) + (B) + (C) of the present invention. 5% by weight, particularly preferably 40 to 10% by weight. If the amount used exceeds 80% by weight, flame retardancy is not exhibited, and heat resistance and impact resistance are poor. If it is less than 5% by weight, the impact resistance is poor. The amount of the rubbery polymer in the component (B) of the present invention is preferably 5 to 80% by weight, more preferably 10 to 70% by weight from the viewpoint of impact resistance. The graft ratio of the component (B) is preferably 20 to 200% by weight, preferably 20 to 40% by weight from the viewpoint of flame retardancy, and 100 to 150% by weight from the appearance of the flame retardant surface.

Preferred combinations of the monomer components that are polymerized in the presence of the rubbery polymer are listed below. 1) Aromatic vinyl compound / vinyl cyanide compound 2) Aromatic vinyl compound / (meth) acrylic acid ester 3) Aromatic vinyl compound / vinyl cyanide compound / (meth) acrylic acid ester 4) Aromatic vinyl compound / maleimide Monomer 5) Aromatic vinyl compound / vinyl cyanide compound / maleimide monomer 6) Aromatic vinyl compound / (meth) acrylic acid ester / maleimide monomer 7) Aromatic vinyl compound / vinyl cyanide Compound / acid anhydride monomer 8) Aromatic vinyl compound / (meth) acrylic acid ester / acid anhydride monomer 9) Aromatic vinyl compound / vinyl cyanide compound / (meth) acrylic acid ester / acid Anhydrous monomer 10) Aromatic vinyl compound / maleimide monomer / acid anhydride monomer The viscosity [η] (methyl ethyl ketone, measured at 30 ° C.) is preferably 0.1.
~ 1.2 dl / g, more preferably 0.2-0.8 d
1 / g.

The component (B) of the present invention can be produced by known polymerization methods such as emulsion polymerization, solution polymerization, suspension polymerization and bulk polymerization. The diameter of the rubber particles dispersed in the component (B) is 0.
It is preferably in the range of 05 to 2 μ, particularly preferably in the range of 0.2 to 2 μ from the Izod impact strength, and particularly preferably in the range of 0.05 to 0.2 μ from the falling weight impact strength and weld strength. .

As the aromatic vinyl compound used in the component (C) of the present invention, all of the above-mentioned compounds are used. Other vinyl monomers copolymerizable with the aromatic vinyl compound include vinyl cyan compounds, acrylic acid esters, methacrylic acid esters, unsaturated compounds containing an acid anhydride group, unsaturated dicarboxylic acid imide compounds, and unsaturated compounds. There are epoxy compounds, unsaturated carboxylic acid amides, amino group-containing unsaturated compounds, hydroxyl group-containing unsaturated compounds, unsaturated acids, oxazoline group-containing unsaturated compounds and the like, and these are used alone or in combination of two or more. . Preferable combinations of the monomer components to be polymerized are those described in the above component (B), and those obtained by copolymerizing an epoxy compound and a hydroxyl group-containing unsaturated compound in the range of 0.5 to 20% by weight. . The component (C) can be used alone or in combination of two or more. The amount of component (C) used is (A) +
(B) + (C) component 0-75% by weight, preferably 0-
It is 50% by weight, more preferably 0 to 40% by weight, particularly preferably 1 to 30% by weight. If the amount used exceeds 75% by weight, flame retardancy, heat resistance and impact resistance are poor.

The component (D) of the present invention is at least one compound represented by the following general formula.

[0017]

[Chemical 3]

(In the formula, R ₁ and R ₂ are alkyl groups having 1 to 5 carbon atoms, preferably 1 to 4 carbon atoms, more preferably 1 to ₃ carbon atoms, and particularly preferably methyl groups. R ₃ is 1 carbon atoms. ~
6, preferably 1 to 4, more preferably 1 to 3 alkyl groups, particularly preferably methyl groups. Also n
Is an integer of 0 to 3, preferably 0 to 1, and more preferably 0. ) A particularly preferable compound as the component (D) is tris- (2,6-dimethylphenyl) phosphate. A typical trade name of this compound is PX130 manufactured by Daihachi Chemical Industry Co., Ltd.

The component (D) of the present invention acts as a flame retardant. The amount used is 1 to 30 parts by weight, preferably 5 to 25 parts by weight, and more preferably 7 to 23 parts by weight, based on 100 parts by weight of the components (A) + (B) + (C). If the amount used is less than 1 part by weight, flame retardancy is not exhibited at all, and if it exceeds 30 parts by weight, heat resistance is poor. When the component (D) of the present invention is used, it is preferable to use the component (D) alone for the purpose of the present invention, but a phosphorus-containing compound other than the component (D) of the present invention can be used in combination. Examples of the phosphorus-containing compound used here include organic phosphorus-containing compounds other than the component (D), red phosphorus, phosphazene-based compounds, ammonium polyphosphate, and the like. Among these, examples of the organic phosphorus-containing compound include phosphates typified by triphenyl phosphate and phosphites typified by triphenyl phosphite. For example, in the following general formulas (I) to (IV), The compounds having at least one of the structural units represented, and the compounds represented by the formulas V and VI.

[0020]

[Chemical 4]

(In the formula, R _{1 to} R ₃ each represent a hydrocarbon residue which may be halogen-substituted, X ^{1 to} X ⁴ represent an oxygen atom or a sulfur atom, and q _{1 to} q ₃ represent 0 or 1. )

[0022]

[Chemical 5]

(In the formula, R _{1 to} R ₄ are each a hydrocarbon residue which may be substituted with halogen, R _{5 to} R ₈ are hydrogen atoms, halogen atoms or hydrocarbon residues, and X ^{1 to} X ⁸ are oxygen. Atom or sulfur atom, p _{1 to} q ₆ are 0 or 1, n
Indicates a number having a degree of polymerization of 1 to 30. )

[0024]

[Chemical 6]

(In the formula, R _{1 to} R ₅ are each a hydrocarbon residue which may be halogen-substituted, R _{6 to} R ₁₃ are hydrogen atoms, halogen atoms or hydrocarbon residues, and X ^{1 to} X ⁸ are oxygen. Atom or sulfur atom, q _{1 to} q ₇ are 0 or 1, n
Indicates a number having a degree of polymerization of 1 to 30. )

[0026]

[Chemical 7]

(Wherein R _{1 to} R ₆ are each a hydrocarbon residue which may be halogen-substituted, R _{7 to} R ₉ are hydrogen atoms, halogen atoms or hydrocarbon residues, and X ^{1 to} X ¹² are oxygen. Atom or sulfur atom, p _{1 to} q ₉ represent 0 or 1.)

These organic phosphorus-containing compounds may be used alone or in admixture of two or more.

When one or more phosphorus compounds other than the above-mentioned component (D) are used in combination with the component (D), it is necessary to use 50% by weight or more of the component (D) in order to achieve the object of the present invention. Is preferred. The composition of the present invention comprising the above (A) to (D) is a combination of at least one selected from (E-1) polytetrafluoroethylene and (E-2) phenolic resin as the (E) component. As a result, the flame retardant effect can be further enhanced. Above all (E
The -1) component is particularly preferable in that it can prevent dripping during flame retardation. Also (E-1) and (E-2)
Is also preferable.

As the polytetrafluoroethylene as the component (E-1), those having a fibril-forming ability and classified into type 3 according to the ASTM standard are preferable. As the polytetrafluoroethylene having a fibril forming ability, for example, Teflon 6J manufactured by Mitsui DuPont Fluorochemical Co., Ltd., Polyflon manufactured by Daikin Chemical Co., Ltd., Hostafuron TF1620 manufactured by Hoechst Co., etc. are commercially available.
The component (E-1) preferably has an average particle size of 1 to 500 microns and a molecular weight of 500,000 to 7,000,000. (E-
The amount of component 1) used is (A) + (B) + (C) of the present invention.
0 to 20 parts by weight, preferably 0.05 to 10 parts by weight, more preferably 0.05 to 5 parts by weight, relative to 100 parts by weight of the components.
Parts by weight, particularly preferably 0.05 to 1 part by weight. When the amount used is within the above range, flame retardancy and impact resistance are excellent, which is preferable.

Examples of the phenol resin as the component (E-2) include novolac type phenol resin and resol type phenol resin. Among these, the novolac type phenolic resin is a polymer having a relatively low molecular weight obtained by condensing a substituted or unsubstituted phenol with formaldehyde and the like, and has no free methylol group. Regarding such novolac type phenolic resin, "Encyclopedia of P
polymer Science and Engine
ering, Vol. 11, pp, 45-95 ". Specific examples of the substituted phenols include aryl-substituted phenols such as cresol, resorcinol and p-phenylphenol, and alkylated phenols such as pt-butylphenol, p-octylphenol and xylenol. In the present invention,
Preference is given to novolak type phenolic resins using phenol, cresol, resorcinol and mixtures thereof.

The resol type phenol resin is a polymer having a relatively low molecular weight obtained by condensing a substituted or unsubstituted phenol with formaldehyde and the like, and has 3 to 20% by weight of a free methylol group. It is a thing. Specific examples of substituted phenols include aryl-substituted phenols such as cresol, resorcinol, p-phenylphenol, and alkylated phenols such as pt-butylphenol, p-octylphenol, xylenol. In the present invention, a resole type phenol resin using phenol, cresol, resorcinol or a mixture thereof is preferable. The blending amount of the component (E-2) is 0 to 100 parts by weight of the total amount of the components (A) to (C) of the present invention.
20 parts by weight, preferably 0.1 to 18 parts by weight, more preferably 0.5 to 15 parts by weight, particularly preferably 1 to 10 parts by weight.
Parts by weight.

Silicon-containing compounds and / or polymers thereof may also be used in the composition of the present invention. Specific examples thereof include silicone oil, polyorganosiloxane such as silicone resin, aluminum silicate, sodium silicate, silicon dioxide, IP of polyorganosiloxane and (meth) acrylic acid ester polymer.
N, core / shell, and graft body. The compounding amount of the silicon-containing compound and / or the polymer thereof is (A) to
It is preferably 20 parts by weight or less, more preferably 0.01 to 10 parts by weight, particularly preferably 0.05 to 5 parts by weight, based on 100 parts by weight of the total amount of (D).

For the purpose of further improving the flame retardancy of the thermoplastic resin composition of the present invention, a substance represented by the following general formula can be added.

[0035]

[Chemical 10]

(In the formula, R _{1 to} R ₃ represent alkylene having 1 to 20 carbon atoms, phenylene, and nucleus-substituted phenylene.) The thermoplastic resin composition of the present invention is obtained by kneading the above-mentioned various components. You can As a kneading method, there is a method using an extruder, a roll, a Banbury mixer, a kneader or the like. A preferred method is a method using an extruder, and examples of the extruder include a single-screw extruder and a twin-screw extruder. When kneading various components using the above kneading method, all the components may be kneaded together, or some of the components may be kneaded first, and the remaining components may be added or kneaded together or separately. Good.

When using the thermoplastic resin composition of the present invention, known colorants, pigments, lubricants, weathering agents, antistatic agents,
Antioxidants, heat aging inhibitors, plasticizers, antibacterial / antifungal agents can be added. Further, as the inorganic filler, glass fiber, carbon fiber, glass milled fiber, glass flake, glass beads, glass balloon, calcium carbonate, mica, talc, rock filler, potassium titanate whiskers, zinc oxide whiskers, metal fibers, sulfuric acid. Magnesium, expanded graphite, graphite, kaolin, metal flakes, hydroxytalcite and the like. In addition, other known polymers such as polyamide depending on the required performance,
Polybutylene terephthalate, polyethylene terephthalate, polypropylene, polyethylene, polysulfone,
Polyphenylene sulfide, polyvinylidene fluoride, polyamide elastomer, polyester elastomer, polyphenylene ether, polycaprorafton, polyarylate and the like can be appropriately blended and used.

The thermoplastic resin composition of the present invention can be molded into various molded articles by injection molding, sheet extrusion, vacuum molding, profile extrusion, injection press, foam molding, blow molding and the like. The obtained molded product, by utilizing its excellent properties, various parts in the automobile field, various parts of home appliances, housings,
It can be used for miscellaneous goods, various parts in the field of OA equipment, housings, chassis, etc.

[0039]

EXAMPLES The present invention will be described in more detail below with reference to examples. In the examples, parts and% are based on polymerization unless otherwise specified. In addition, various evaluations in the examples,
It is a value measured as follows. Each component was melt-kneaded with a twin-screw extruder at a cylinder set temperature of 210 to 250 ° C. to prepare pellets. After sufficiently drying with a dehumidifying dryer, a test piece for performance evaluation was prepared using an injection molding machine. The evaluation method is as follows.

[Combustion test] (1) In accordance with UL-94. 1/16 "x 1/2" x 5 "
The burning state after contacting the test piece of No. 2 was observed and judged by ◯ ×. X: Continued to burn. ○: It disappeared naturally. [Izod impact strength] ASTM D256 1 /
4 ″, 23 ° C., measured with a notch. [Heat resistance] In accordance with ASTM D648, thickness 1 /
The heat distortion temperature was measured at 2 ″ and a load of 18.6 kg / cm ² .

Component (A) of the Present Invention The following polymer was used as the component (A) of the present invention. A polycarbonate having the following viscosity average molecular weight obtained by condensation polymerization of bisphenol A and phosgene was used. A-1: Polycarbonate having a molecular weight of 22,000 A-2: Polycarbonate having a molecular weight of 25,000 Rubber (B) component of the present invention b-1 to b-3 Rubber used for the thermoplastic resin (B) of the present invention As the quality polymer, those shown in Table 1 were used.

[0042]

[Table 1]

Polymers B-1 to B-4 Resins obtained by graft-polymerizing various monomers in the presence of the above rubbery polymer were obtained. The compositions of these resins are shown in Table 2.

[0044]

[Table 2]

Component (C) of the present invention Polymers C-1 and C-2 having the compositions shown in Table 3 were polymerized.

[0046]

[Table 3]

Component (D) of the present invention D-1: As component (D) of the present invention, tris- (2,6-
Dimethylphenyl) phosphate was used. D-2: Triphenyl phosphate was used as the organic phosphorus compound used in the comparative example. (E) components were used Hoechst Hosutaron ^R TF1620. Preparation of thermoplastic resin composition The above components were mixed according to the formulation shown in Table 4, melt-kneaded and pelletized using a twin-screw extruder. The obtained pellets were dried to a water content of 0.05% or less, and a test piece for measuring heat resistance, Izod impact strength and flammability was molded by injection molding, and evaluated by the above evaluation method. The evaluation results are shown in Table 4.

[0048]

[Table 4]

Comparative Example 1 is an example in which the amount of component (A) used was small outside the range of the present invention and the amount of component (B) used was large outside the range of the present invention. Impact resistance, heat resistance and Inferior flame retardancy. Comparative Example 2 is an example in which the use amount of the component (A) is large outside the range of the present invention and the use amount of the component (B) is small outside the range of the present invention, and the impact resistance is poor. Comparative Example 3 is an example in which the amount of the component (D) used is small outside the range of the present invention, and the flame retardancy is poor. Comparative Example 4 is an example in which the amount of the component (E) used is small outside the range of the present invention, and the flame retardancy is poor. Comparative Example 5 is an example in which a general phosphorus-based flame retardant outside the scope of the present invention was used as the component (D), and the heat resistance and flame retardancy were poor.

[0050]

INDUSTRIAL APPLICABILITY The thermoplastic resin composition of the present invention is excellent in flame retardancy, heat resistance and impact resistance, and is used in various fields related to OA equipment, housings, chassis, various parts of home electric appliances, housings, It is useful for miscellaneous goods, automobile interior and exterior parts, etc.

[Chemical 8]

[Chemical 9]

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location C08L 61/04 LMC (72) Inventor Takeki Furuyama 2-11-24 Tsukiji, Chuo-ku, Tokyo Japan Naru Rubber Co., Ltd.

Claims (1)

[Claims] 1. (A) Aromatic polycarbonate 20 to 9
Thermoplastic resin 80 obtained by graft-polymerizing 5% by weight of (B) an aromatic vinyl compound or an aromatic vinyl compound and another vinyl monomer copolymerizable with an aromatic vinyl compound. -5% by weight, (C) 0-75% by weight of an aromatic vinyl compound or a styrene resin obtained by polymerizing an aromatic vinyl compound and another vinyl monomer copolymerizable with the aromatic vinyl compound, the above ( A) +
1 to 30 parts by weight of (D) at least one compound represented by the following general formula, relative to 100 parts by weight of component (B) + (C), (In the formula, R ₁ and R ₂ are alkyl groups having 1 to 5 carbon atoms, R ₃ is an alkyl group having 1 to 6 carbon atoms, and n is an integer of 0 to _3. ) (E) Polytetrafluoroethylene (E-1 ) And at least one kind selected from the phenolic resins (E-2) in an amount of 0 to 20 parts by weight.