JP2005213342A - Flame-retardant resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flame-retardant resin composition which exhibits an especially excellent performance in weather resistance, has excellent flame retardancy and impact resistance, and gives molded articles having good appearances. <P>SOLUTION: This flame-retardant resin composition comprises (A) 100 pts. wt. of a rubber-containing styrenic resin, (B) 5 to 40 pts. wt. of a halogen-containing epoxy modified product represented by general formula (1) (R<SB>1</SB>and R<SB>2</SB>are glycidyl, H, or a group represented by a specific formula; X is a halogen atom), (C) 1 to 20 pts. wt. of an antimony compound, (D) 0.1 to 3 pts. wt. of a nitrogen-containing compound represented by general formula (3) (three of R<SB>4</SB>, R<SB>5</SB>, R<SB>6</SB>and R<SB>7</SB>are each the group represented by the specific formula, and the remaining is H), and (E) 0.1 to 3 pts. wt. of a benzotriazole-based compound. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a flame retardant resin composition which exhibits excellent weather resistance, is excellent in flame retardancy and impact resistance, and has a good molded article appearance.

  Rubber-containing styrenic resin compositions have excellent mechanical properties and are widely used as housing materials for office equipment such as electric parts, computers and printers used indoors and outdoors. These housing materials are often required to have high safety flame retardancy, and it is important that the resin is ranked at a high flame retardance level in the UL-regulated combustion test (UL94). The most common flame retarding method for resin materials is a method of kneading a halogen-based organic compound as a flame retardant and further an antimony compound as a flame retardant aid.

  In addition, with the recent miniaturization and portability of OA equipment, the housing material has been required to be lighter, and it has become increasingly thin. For this reason, the impact resistance of the flame-retardant resin used in these housing materials is also an important characteristic. In addition, electrical parts used outdoors such as household gas / water meters and outdoor lighting devices are exposed to sunlight, rain, wind, etc., so that the weather resistance is insufficient. Designability may be impaired, and cracks and cracks may occur. Therefore, materials having excellent weather resistance are required for electrical parts used outdoors.

  Conventionally, in a field where such weather resistance is required, in order to improve the weather resistance, a method of adding an ultraviolet absorber, a basic inorganic compound, or the like (for example, see Patent Documents 1 and 2), or bromination A method of using a bisphenol-type epoxy compound or a reaction product thereof as a flame retardant (see, for example, Patent Documents 3, 4, and 5) has been proposed.

Although the above-mentioned method can improve the weather resistance while maintaining the impact resistance, appearance of the molded product, and flame retardancy of the resin material to a certain level, it is still insufficient for the required level. There are many people who demand more materials.
JP-A-1-101350 (page 3-4, Table 1) JP-A-9-255842 (paragraph numbers 0044 to 0064) JP-A-9-48900 (paragraph numbers 0028 to 0043) JP-A-9-59463 (paragraph numbers 0025 to 0035) JP 10-7870 A (paragraph numbers 0017 to 0024)

  The present invention has been made in view of the above circumstances, and provides a flame retardant resin composition which exhibits particularly excellent weather resistance, is excellent in flame retardancy and impact resistance, and has a good molded article appearance. This is the issue.

  As a result of intensive studies in order to achieve the above object, the present inventors have found that a flame retardant rubber in which a halogen-containing flame retardant and an antimony compound are further blended with a specific nitrogen-containing compound and a specific ultraviolet absorber. It is found that the styrene-containing resin contains much better weather resistance than the conventional flame retardant resin using only the halogen-based flame retardant, and the flame retardancy, impact resistance and appearance of the molded product are also improved. Has reached

  That is, in the present invention, 5 to 40 parts by weight of the halogen-containing epoxy-modified product (B) represented by the following general formula (1) and 1 part of the antimony compound (C) 1 per 100 parts by weight of the rubber-containing styrene resin (A). In particular, by blending 0.1 to 3 parts by weight of a nitrogen-containing compound (D) represented by the following general formula (3) and 0.1 to 3 parts by weight of a benzotriazole-based compound (E), particularly weather resistance The present inventors have found that a flame retardant resin composition exhibiting excellent performance, excellent flame retardancy and impact resistance, and having a good appearance of a molded product can be obtained.

（ただし、式中Ｒ_１及びＲ_２はグリシジル基、水素原子又は下記一般式（２）

(In the formula, R ₁ and R ₂ are glycidyl groups, hydrogen atoms, or the following general formula (2)

で示される基であり、Ｒ_３は低級アルキル基、Yはハロゲン原子、ｒ及びｓは０〜５の範囲で且つｒ＋ｓは５以下の整数、また、Ｘはハロゲン原子、ｐ及びｑは０〜４の範囲で且つ全部のｐとｑが０になることのない整数を示す。また、ｎは平均重合度を示しており、０〜５又は２５以上の整数である。）

R ₃ is a lower alkyl group, Y is a halogen atom, r and s are in the range of 0 to 5 and r + s is an integer of 5 or less, X is a halogen atom, p and q are 0 to An integer in the range of 4 and in which all p and q are not 0. Moreover, n has shown the average polymerization degree and is an integer of 0-5 or 25 or more. )

（式中、Ｒ_４、Ｒ_５、Ｒ_６ およびＲ_７の三つは、下記一般式（４）で表される残基を表し、そしてＲ_４、Ｒ_５、Ｒ_６およびＲ_７の一つは水素原子を表す。ａ，ｂ及びｃはそれぞれ、２〜５の整数を表す。）

(In the formula, three of R ₄ , R ₅ , R ₆ and R ₇ represent a residue represented by the following general formula (4), and one of R ₄ , R ₅ , R ₆ and R ₇ . Represents a hydrogen atom, and a, b and c each represents an integer of 2 to 5.)

（式中、Ｒ_８は炭素原子数１〜１０のアルキル基または水素原子を表し、Ｒ_９は炭素原子数５〜１０のシクロアルキル基または炭素原子数１〜４のアルキル基で置換された炭素原子数５〜１０のシクロアルキル基を表す。）

(In the formula, R ₈ represents an alkyl group having 1 to 10 carbon atoms or a hydrogen atom, and R ₉ is a carbon substituted with a cycloalkyl group having 5 to 10 carbon atoms or an alkyl group having 1 to 4 carbon atoms. Represents a cycloalkyl group having 5 to 10 atoms.)

  Since the resin composition of the present invention is a resin composition that exhibits excellent weather resistance and is excellent in flame retardancy and impact resistance, and has a good appearance of a molded product, it is used for automobile parts, home appliances, indoors and It can be applied to a wide range of fields such as electrical parts used outdoors.

  The rubber-containing styrene resin (A) in the present invention is obtained by polymerizing a styrene monomer alone or a styrene monomer and another copolymerizable monomer in the presence of a rubbery polymer. Resin.

  The rubbery polymer that can constitute the rubber-containing styrene resin includes polybutadiene, polyisoprene, butadiene-styrene copolymer, isoprene-styrene copolymer, butadiene-acrylonitrile copolymer, butadiene-isoprene-styrene copolymer. Polymers, diene rubbers such as polychloroprene, ethylene-propylene copolymers, ethylene-propylene rubbers such as ethylene-propylene-nonconjugated diene (ethylidene norbornene, dicyclopentadiene, etc.) copolymers, polybutyl acrylate, etc. An acrylic rubber etc. are mentioned, 1 type, or 2 or more types can be used.

  Examples of the styrene monomer include styrene, α-methylstyrene, paramethylstyrene, bromostyrene, and the like, and one or two or more types can be used. In particular, styrene and α-methylstyrene are preferable.

  Other copolymerizable monomers that can be used with the styrenic monomer include vinyl cyanide compounds such as acrylonitrile and methacrylonitrile, and (meth) acrylic acid ester compounds such as methyl methacrylate and methyl acrylate. And maleimide compounds such as N-phenylmaleimide and N-cyclohexylmaleimide, and unsaturated carboxylic acid compounds such as acrylic acid, methacrylic acid, itaconic acid, and fumaric acid, which can be used alone or in combination of two or more.

  Specifically, acrylonitrile-butadiene rubber-styrene polymer (ABS), acrylonitrile-ethylene-propylene rubber-styrene polymer (AES), acrylonitrile-acrylate rubber-styrene polymer (AAS), butadiene rubber -Rubber-containing styrene resin such as styrene copolymer (HIPS), rubber-containing styrene resin and polystyrene (PS), styrene-acrylonitrile copolymer (AS), α-methylstyrene-acrylonitrile copolymer (αMS -ACN), methyl methacrylate-styrene copolymer (MS), methyl methacrylate-acrylonitrile-styrene copolymer (MAS), styrene-N-phenylmaleimide copolymer (S-NPMI), styrene-N-phenylmaleimide -Acrylonitrile Examples thereof include a mixture with a rubber-free styrenic resin such as a copolymer (SA-NPMI).

  There is no restriction | limiting in the manufacturing method of rubber-containing styrene resin (A), A conventionally well-known emulsion polymerization method, suspension polymerization method, block polymerization method, solution polymerization method, and those combinations are used.

  As the halogen-containing epoxy-modified product (B) in the present invention, the following general formula (1)

（ただし、式中Ｒ_１及びＲ_２はグリシジル基、水素原子又は下記一般式（２）

(In the formula, R ₁ and R ₂ are glycidyl groups, hydrogen atoms, or the following general formula (2)

で示される基であり、Ｒ_３は低級アルキル基、Yはハロゲン原子、ｒ及びｓは０〜５の範囲で且つｒ＋ｓは５以下の整数、また、Ｘはハロゲン原子、ｐ及びｑは０〜４の範囲で且つ全部のｐとｑが０になることのない整数を示す。また、ｎは平均重合度を示しており、０〜５又は２５以上の整数である。）で表されるものが使用できる。

R ₃ is a lower alkyl group, Y is a halogen atom, r and s are in the range of 0 to 5 and r + s is an integer of 5 or less, X is a halogen atom, p and q are 0 to An integer in the range of 4 and in which all p and q are not 0. Moreover, n has shown the average polymerization degree and is an integer of 0-5 or 25 or more. ) Can be used.

  The average degree of polymerization n of the halogen-containing epoxy-modified product (B) is preferably an integer of 0 to 5 or 25, more preferably an integer of 0 to 3 or 30. When the halogen-containing epoxy-modified product (B) having an average polymerization degree n of 6 to less than 25 is used, mechanical properties such as impact resistance of the resin composition are lowered, and good physical properties cannot be obtained.

  The method for producing the halogen-containing epoxy modified product of the present invention can be obtained by heating halogenated bisphenol A and halogenated bisphenol A diglycidyl ether, and in some cases, halogenated phenol in the presence of a catalyst, but is not limited thereto. Is not to be done.

  In addition, as the halogen-containing epoxy-modified product used in the present invention, it is preferable to use a product having a small change in appearance color tone when left to stand by heating. When a halogen-containing epoxy modified product having a large change in appearance color tone upon heating is used, the weather resistance is impaired.

  The addition amount of the halogen-containing epoxy-modified product (B) is preferably 5 to 40 parts by weight with respect to 100 parts by weight of the rubber-containing styrene resin (A). When the addition amount is less than 5 parts by weight, the effect of imparting flame retardancy to the resin composition becomes insufficient, and when it exceeds 40 parts by weight, mechanical properties such as impact resistance of the resin composition are deteriorated.

  The antimony compound (C) in the present invention improves the flame retardancy of the resin composition, and known compounds can be used. Examples thereof include antimonates such as antimony trioxide, antimony pentoxide, and sodium antimonate, molybdenum oxide, and tin oxide. As these antimony compounds, those having a surface treated are commercially available, and those having a surface treated may be used.

  The addition amount of the antimony compound (C) is preferably 1 to 20 parts by weight with respect to 100 parts by weight of the rubber-containing styrenic resin (A). When the addition amount is less than 1 part by weight, the flame retardancy imparted by the synergistic effect with the halogen-containing epoxy-modified product (B) is insufficient, and when it exceeds 20 parts by weight, the finally obtained flame retardant resin composition The impact resistance of the is reduced.

  In order to further improve the flame retardancy of the resin composition, a dripping inhibitor such as polytetrafluoroethylene, chlorinated polyethylene, or silicone oil is added to the flame-retardant resin composition of the present invention. A) You may mix | blend in 0-3 weight part with respect to 100 weight part. If it exceeds 3 parts by weight, the moldability, appearance of the molded product, heat resistance, and impact resistance tend to decrease.

  In the present invention, the nitrogen-containing compound (D) represented by the following general formula (3) is a compound that can significantly improve the weather resistance of the resin composition when used in combination with the benzotriazole-based compound (E). .

（式中、Ｒ_４、Ｒ_５、Ｒ_６ およびＲ_７の三つは、下記一般式（４）で表される残基を表し、そしてＲ_４、Ｒ_５、Ｒ_６およびＲ_７の一つは水素原子を表す。ａ，ｂ及びｃはそれぞれ、２〜５の整数を表す。）

(In the formula, three of R ₄ , R ₅ , R ₆ and R ₇ represent a residue represented by the following general formula (4), and one of R ₄ , R ₅ , R ₆ and R ₇ . Represents a hydrogen atom, and a, b and c each represents an integer of 2 to 5.)

（式中、Ｒ_８は炭素原子数１〜１０のアルキル基または水素原子を表し、Ｒ_９は炭素原子数５〜１０のシクロアルキル基または炭素原子数１〜４のアルキル基で置換された炭素原子数５〜１０のシクロアルキル基を表す。）

(In the formula, R ₈ represents an alkyl group having 1 to 10 carbon atoms or a hydrogen atom, and R ₉ is a carbon substituted with a cycloalkyl group having 5 to 10 carbon atoms or an alkyl group having 1 to 4 carbon atoms. Represents a cycloalkyl group having 5 to 10 atoms.)

  As the nitrogen-containing compound (D) used in the present invention, a nitrogen-containing compound represented by the following general formula (5) is preferable, and a combination of the following general formula (5) and the following general formula (6) is particularly preferable.

即ち、上記一般式(５)で示される窒素含有化合物は、上記一般式(３)において、Ｒ_４、Ｒ_５、Ｒ_７が上記一般式(４)で示されるピペリジル基を含有するトリアジン誘導体基であり、Ｒ_６が水素原子であり、ａ，ｂ及びｃがそれぞれ、３，２，３の整数である窒素含有化合物である。

That is, the nitrogen-containing compound represented by the general formula (5) is a triazine derivative group in which R ₄ , R ₅ and R ₇ in the general formula (3) contain a piperidyl group represented by the general formula (4). And R ₆ is a hydrogen atom, and a, b and c are nitrogen-containing compounds each having an integer of 3, 2 or 3.

また、上記一般式(６)で示されるものは、上記一般式(３)または(５)のＲ_４、Ｒ_５、Ｒ_７を示すものであり、上記一般式(４)のＲ_８が炭素原子数４のブチル基であり、Ｒ_９が炭素原子数６のシクロヘキシル基であるピペリジル基を含有するトリアジン誘導体基である。

Further, what is represented by the above general formula (6) represents R ₄ , R ₅ , R ₇ of the above general formula (3) or (5), and R _{8 of the} above general formula (4) is carbon. It is a triazine derivative group containing a piperidyl group which is a butyl group having 4 atoms and R ₉ is a cyclohexyl group having 6 carbon atoms.

  The addition amount of the nitrogen-containing compound (D) of the present invention is preferably 0.1 to 3 parts by weight with respect to 100 parts by weight of the rubber-containing styrene resin (A). When the addition amount is less than 0.1 parts by weight, the weather resistance of the finally obtained flame retardant resin composition tends to deteriorate, and the heat resistance exceeding 3 parts by weight tends to decrease.

  Examples of the benzotriazole-based compound (E) in the present invention include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole and 2- (3 ′, 5′-ditert-butyl-2′-hydroxy). Phenyl) benzotriazole, 2- (5′-tert-butyl-2′-hydroxyphenyl) benzotriazole, 2- (2′-hydroxy-5 ′-(1,1,3,3-tetramethylbutyl) phenyl) Benzotriazole, 2- (3 ′, 5′-ditert-butyl-2′-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3′-tert-butyl-2′-hydroxy-5′-methylphenyl) ) -5-chlorobenzotriazole, 2- (3′-secondarybutyl-5′-tert-butyl-2′-hydroxyphenyl) benzotriazole, 2- (2′-hydride) Xyl-4′-octyloxyphenyl) benzotriazole, 2- (2′-hydroxy-5′-octylphenyl) benzotriazole, 2- (3 ′, 5′-ditertiaryamyl-2′-hydroxyphenyl) benzo Triazole, 2- (3 ′, 5′-bis (α, α-dimethylbenzyl) -2′-hydroxyphenyl) benzotriazole, 2- (3′-tert-butyl-2′-hydroxy-5 ′-(2 -Octyloxycarbonylethyl) phenyl) -5-chlorobenzotriazole, 2- (3'-tert-butyl-5 '-[2- (2-ethylhexyloxy) carbonylethyl] -2'-hydroxyphenyl) -5 Chlorobenzotriazole, 2- (3′-tert-butyl-2′-hydroxy-5 ′-(2-methoxycarbonylethyl) phenyl) -5 Lorobenzotriazole, 2- (3′-tert-butyl-2′-hydroxy-5 ′-(2-methoxycarbonylethyl) phenyl) benzotriazole, 2- (3′-tert-butyl-2′-hydroxy-5) '-(2-octyloxycarbonylethyl) phenyl) benzotriazole, 2- (3'-tert-butyl-5'-[2- (2-ethylhexyloxy) carbonylethyl] -2'-hydroxyphenyl) benzotriazole, 2- (3′-dodecyl-2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (3′-tert-butyl-2′-hydroxy-5 ′-(2-isooctyloxycarbonylethyl) phenyl Benzotriazole, 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6-benzotria Trans-2-ylphenol], 2- [3′-tert-butyl-5 ′-(2-methoxycarbonylethyl) -2′-hydroxyphenyl] -2H-benzotriazole and polyethylene glycol 300 Compound: The following formula: [R—CH 2 CH 2 —COO—CH 2 CH 2 —] 2 (wherein R represents a 3′-tert-butyl-4′-hydroxy-5′-2H-benzotriazol-2-ylphenyl group) 2- [2′-hydroxy-3 ′-(α, α-dimethylbenzyl) -5 ′-(1,1,3,3-tetramethylbutyl) phenyl] benzotriazole, 2- [2′-hydroxy-3 ′-(1,1,3,3-tetramethylbutyl) -5 ′-(α, α-dimethylbenzyl) phenyl] benzotriazole and the like, and resin Improve the weather resistance of the composition.

  Preferably, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (3 ′, 5′-ditertiary amyl-2′-hydroxyphenyl) benzotriazole, 2- (3′-first) Tributyl-2'-hydroxy-5'-methylphenyl) -5-chlorobenzotriazole, 2- [3'-tert-butyl-5 '-(2-methoxycarbonylethyl) -2'-hydroxyphenyl] -2H -Transesterification product of benzotriazole and polyethylene glycol 300; [R-CH2CH2-COO-CH2CH2-] 2 wherein R is 3'-tert-butyl-4'-hydroxy-5 ' -H-benzotriazol-2-ylphenyl group).

  The addition amount of the benzotriazole compound (E) is preferably 0.1 to 3 parts by weight with respect to 100 parts by weight of the rubber-containing styrene resin (A). When the addition amount is less than 0.1 parts by weight, the weather resistance of the finally obtained flame retardant resin composition tends to deteriorate, and the heat resistance exceeding 3 parts by weight tends to decrease.

  As the antioxidant used as necessary in the present invention, a phenol-based antioxidant, an organic phosphite-based antioxidant, a thioether-based antioxidant, a hindered amine-based antioxidant, or the like can be used.

  As addition amount of antioxidant, it is preferable to mix | blend in the range of 0-3 weight part with respect to 100 weight part of rubber-containing styrene resin (A). If it exceeds 3 parts by weight, the moldability, appearance of the molded product, heat resistance, and impact resistance tend to decrease.

  In the flame-retardant resin composition of the present invention, other thermoplastic resins can be used in combination as long as the purpose is not significantly impaired. For example, polyester, polycarbonate, polyurethane, polyacetal, polyphenylene ether, polyethylene, polypropylene, polyamide, polyester elastomer, polyamide elastomer and the like can be blended.

  In the flame-retardant resin composition of the present invention, an antioxidant, a filler, a known coupling agent, a plasticizer, a colorant, a light stabilizer, an antibacterial agent, a lubricant, as long as the purpose is not significantly impaired. A nucleating agent, a release agent, an antistatic agent, a tackifier, an antifogging agent, a surfactant, a metal deactivator, a heat stabilizer, a dispersant, an impact resistance improver, and the like may be added.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated concretely, this invention is not restrict | limited to the following description examples, unless the summary is exceeded.

  As the halogen-containing epoxy-modified product (B) used in the examples and comparative examples, those synthesized by the synthesis examples described below were used.

<Synthesis Example 1>
790 g (1 mol) of brominated bisphenol A type epoxy resin (epoxy equivalent 395) and 253 g (0.46 mol) of tetrabromobisphenol A were placed in a separable four-necked flask and reacted at 140 to 170 ° C. for several hours under a nitrogen stream after adding the catalyst. I let you. After completion of the reaction, the mixture was cooled and pulverized to obtain a light yellow powder product. This product had an acid value of 0.3 (mg KOH / g), an epoxy equivalent of 990, a softening point of 130 ° C., a bromine content of 50.8% by weight, and an average degree of polymerization of n = 2.2. Hereinafter, this halogen-containing epoxy-modified product is referred to as (b-1).

<Synthesis Example 2>
662 g (1 mol) of brominated bisphenol A type epoxy resin (epoxy equivalent 331) and 331 g (1 mol) of tribromophenol were placed in a separable four-necked flask and reacted at 120 to 130 ° C. for several hours under a nitrogen stream after adding the catalyst. Thereafter, the reaction was further carried out at 140 to 160 ° C. for several hours. After completion of the reaction, the mixture was cooled and pulverized to obtain a light yellow powder product. This product had an acid value of 0.1 (mg KOH / g), an epoxy equivalent of 1010, a softening point of 81 ° C., and a bromine content of 56.4% by weight. Hereinafter, this halogen-containing epoxy-modified product is referred to as (b-2).

<Examples 1-3, Comparative Examples 1-3>
The proportions listed in Table 1 below were weighed and mixed with a blender. The obtained mixture was melt-kneaded at a cylinder temperature of 210 to 230 ° C. by a twin-screw extruder (manufactured by Ikekai Tekko Co., Ltd., model: PCM30) to obtain a pellet-shaped resin composition. After the obtained pellets were dried at 90 ° C. for 3 hours, a test piece was prepared with an injection molding machine (manufactured by Toshiba Machine Co., Ltd., model: IS60B) at a cylinder temperature of 230 ° C., and the following items were evaluated. . The evaluation test results are shown in Table 1.

<Evaluation method>
Molded product appearance: The gloss of the molded product appearance is visually observed. “Good” indicates good, “×” indicates inferior
".
Izod impact strength: Measured according to JISK7110.
Bending strength: measured in accordance with JISK7203.
Flexural modulus: measured in accordance with JISK7203.
Flammability: Evaluation was performed according to the flammability standard UL94 using a test piece having a thickness of 1/16 inch.
Weather resistance: After an outdoor exposure test for 3 months, the degree of discoloration (ΔE) was measured with a color difference meter and evaluated.

As described above, the flame retardant resin composition of the present invention contains a halogen-containing epoxy-modified product, an antimony compound, a specific nitrogen-containing compound and a benzotriazole-based compound, and therefore has excellent flame retardancy. Needless to say, it exhibits particularly excellent weather resistance, and also has excellent impact resistance and appearance of the molded product. Therefore, the flame-retardant resin composition of the present invention includes, for example, automotive radiator grilles, door mirror housings, lamp housings, door handles, various moldings, box covers, fenders, automobile parts, mobile phone housings, personal computer housings. Can be used for electrical parts used indoors and outdoors such as housings for acoustic parts, household appliances such as various switch buttons, compact, caps, lighting housings, lighting covers, lighting louvers, decorative buttons, etc. Industrial value is extremely high.

Claims (1)

5 to 40 parts by weight of a halogen-containing epoxy-modified product (B) represented by the following general formula (1), 1 to 20 parts by weight of an antimony compound (C), based on 100 parts by weight of the rubber-containing styrene resin (A), A flame retardant resin composition comprising 0.1 to 3 parts by weight of a nitrogen-containing compound (D) represented by the general formula (3) and 0.1 to 3 parts by weight of a benzotriazole compound (E).

(In the formula, R ₁ and R ₂ are glycidyl groups, hydrogen atoms, or the following general formula (2)

R ₃ is a lower alkyl group, Y is a halogen atom, r and s are in the range of 0 to 5 and r + s is an integer of 5 or less, X is a halogen atom, p and q are 0 to An integer in the range of 4 and in which all p and q are not 0. Moreover, n has shown the average polymerization degree and is an integer of 0-5 or 25 or more. )

(In the formula, three of R ₄ , R ₅ , R ₆ and R ₇ represent a residue represented by the following general formula (4), and one of R ₄ , R ₅ , R ₆ and R ₇ . Represents a hydrogen atom, and a, b and c each represents an integer of 2 to 5.)

(In the formula, R ₈ represents an alkyl group having 1 to 10 carbon atoms or a hydrogen atom, and R ₉ is a carbon substituted with a cycloalkyl group having 5 to 10 carbon atoms or an alkyl group having 1 to 4 carbon atoms. Represents a cycloalkyl group having 5 to 10 atoms.)