JPH05230360A - Flame retardant resin composition - Google Patents

Abstract

PURPOSE:To improve the flame retardance of a blend of a polyphenylene ether resin with a polyamide resin. CONSTITUTION:The objective flame retardant resin composition is characterized by including (c) 0.01-10 pts.wt. compound (e.g. maleic anhydride) having an unsaturated group and a polar group together in the same molecule, (d) 1-40 pts.wt. brominated polystyrene, (e) 1-40 pts.wt. brominated benzyl polyacrylate, (f) 1-30 pts.wt. antimony compound and (g) 0-30 pts.wt. impact resistance improver in 100 pts.wt. total amount of (a) 10-90 pts.wt. polyphenylene ether resin and (b) 90-10 pts.wt. polyamide resin.

Description

Detailed Description of the Invention

[0001]

The present invention relates to heat resistance, mechanical properties,
The present invention relates to a resin composition having excellent moldability and flame retardancy.

[0002]

2. Description of the Related Art Polyphenylene ether resin is excellent in heat resistance, mechanical properties, electrical properties, and flame retardancy.
Moreover, it has characteristics such as low water absorption and good dimensional stability. However, polyphenylene ether resin is inferior in moldability, and it is difficult to use it alone, and it is blended with various resins. Among them, a blend with a polyamide resin is a resin having excellent moldability, heat resistance and mechanical properties, and is used for various purposes.

However, a blend of a polyphenylene ether resin and a polyamide resin loses the self-extinguishing property of the polyphenylene ether resin, and it is necessary to add a flame retardant to impart flame retardancy. At that time, when a conventional flame retardant for polyamide or polyphenylene ether is used alone, a large amount of flame retardant is required to make such a blend flame retardant, and therefore the heat resistance of the resin However, there is a problem that mechanical properties and moldability are impaired.

[0004]

Means for Solving the Problems As a result of diligent study on this problem, the present inventors have found that by using brominated polystyrene effective for polyphenylene ether resin and brominated benzyl polyacrylate effective for polyamide resin in combination,
The inventors have found that flame retardancy and excellent mechanical properties, which cannot be obtained by themselves, are obtained, and have reached the present invention. That is, the present invention has a total of 1 to 10 parts by weight of (a) polyphenylene ether resin and 90 to 10 parts by weight of polyamide resin (b).
0.1 to 10 parts by weight of (c) a compound having an unsaturated group and a polar group in the same molecule, relative to 00 parts by weight,
(D) 1 to 40 parts by weight of brominated polystyrene, (e) 1 to 40 parts by weight of brominated benzyl polyacrylate,
(F) 1 to 30 parts by weight of antimony compound, and (g)
A flame-retardant resin composition comprising 0 to 30 parts by weight of an impact resistance improver.

[Constituent] The polyphenylene ether resin of the component (a) used in the present invention is represented by the following general formula (1):

[0006]

[Chemical 1]

In the formula, n is at least 50, and R ¹ , R ² , R ³ and R ⁴ are each independently a hydrogen atom, a halogen atom or a tertiary α-carbon. A hydrocarbon group containing no atoms, at least 2 halogen atoms
A monovalent substituent selected from the group consisting of a halohydrocarbon group substituted via 4 carbon atoms, a hydrocarbonoxy group and a halohydrocarbonoxy group substituted with at least 2 carbon atoms. Represent

Examples of the above-mentioned hydrocarbon group containing no tertiary α-carbon atom include methyl, ethyl, propyl,
Lower alkyl groups such as isopropyl and butyl: alkenyl groups such as vinyl, allyl, butenyl, cyclobutenyl: aryl groups such as phenyl, tolyl, xylenyl, 2,4,6-trimethylphenyl: benzyl, phenylether,
Examples thereof include aralkyl groups such as phenylpropyl.

Examples of the halohydrocarbon group in which a halogen atom is substituted via at least two carbon atoms include, for example, 2
-Chloroethyl, 2-bromoethyl, 2-fluoroethyl, 2,2-dichloroethyl, 2- or 3-bromopropyl, 2,2-difluoro-3-iodopropyl, 2
-, 3-, 4- or 5-fluoroamyl, 2-chlorovinyl, chloroethylphenyl, ethylchlorophenyl,
Examples include fluoroxylyl, chloronaphthyl, bromobenzyl and the like.

Examples of the hydrocarbon oxy group include methoxy, ethoxy, propoxy, butoxy, phenoxy, ethylphenoxy, naphthoxy, methylnaphthoxy, benzyloxy, phenylethoxy, tolylethoxy and the like. Examples of the halohydrocarbonoxy group in which a halogen atom is substituted via at least two carbon atoms include 2-chloroethoxy, 2-bromoethoxy, 2-fluoroethoxy, 2,2-dipromoethoxy, 2- and 3-promopropoxy, chloroethylphenoxy, ethylchlorophenoxy, iodoxyloxy,
Examples include chloronaphthoxy, bromobenzyloxy, chlorotolylethoxy and the like.

The polyphenyl ether resin used in the present invention includes copolymers of 2,6-dimethylphenol and 2,3,6-trimethylphenol, 2,6-dimethylphenol and 2,3,5,6-tetraphenol. Also included are copolymers of methylphenol and copolymers of 2,6-diethylphenol and 2,3,6-trimethylphenol. Further, a modified polyphenylene ether such as one obtained by grafting a styrene-based monomer (for example, styrene, p-methylstyrene, α-methylstyrene, etc.) onto the polyphenylene ether of the general formula (I) may be used. .. A method for producing a polyphenylene ether corresponding to the above is known, and for example, US Pat. No. 3,306,874,
No. 3306875, No. 3257357 and No. 325
No. 7358, Japanese Patent Publication No. 52-18880 and Japanese Patent Publication No. 50-51197.

For the purposes of the present invention preferably polyphenylene ether resins are those which have an alkyl substituent in the two ortho positions relative to the ether oxygen atom and 2,6-
It is a copolymer of dialkylphenol and 2,3,6-trialkylphenol. The polyphenylene ether resin used in the present invention preferably has an intrinsic viscosity of 0.2 to 0.8 measured at 30 ° C. in chloroform,
More preferably, it is 0.3 to 0.7. If it is less than 0.2, the mechanical strength is poor, and if it exceeds 0.8, the moldability is poor, which is not preferable.

Next, the polyamide as the component (b) has a --CONH-- bond in its main chain and can be melted by heating. Typical examples thereof include nylon-4, nylon-6, nylon-6,6, nylon-4,6, nylon-12, nylon-6,10, and other known aromatic diamines and aromatic dicarboxylic acids. A crystalline or amorphous polyamide containing the monomer component of can be used. The amorphous polyamide referred to here is a scanning scanning calorimeter (DS).
It means that the crystallinity measured according to C) does not substantially exist. Preferred polyamide resin (b) is nylon-
6, nylon 6,6, and it is possible to use amorphous polyamide in combination with these. The relative viscosity measured in concentrated sulfuric acid at 25% and 98% is preferably 2.0 to 7.0. If it is less than 2.0, the mechanical strength is insufficient, and 7.0
If it exceeds, the moldability is deteriorated, which is not preferable.

Next, as a compound having an unsaturated group and a polar group in the same molecule of the component (c), an unsaturated carboxylic acid, an unsaturated carboxylic acid derivative, an unsaturated epoxy compound,
Unsaturated alcohols, unsaturated amines, unsaturated isocyanates, etc. are mainly used. Specifically, maleic anhydride, maleic acid, fumaric acid, maleimide, maleic acid and hydrazide, a reaction product of maleic anhydride and diamine, for example, the following formula

[0015]

[Chemical 2]

(Wherein R represents an aliphatic group or an aromatic group), methyl nadic acid anhydride, dichloromaleic anhydride, maleic acid amide, itaconic acid, itaconic anhydride, and the like. Saturated dicarboxylic acids and their derivatives: Natural oils and fats such as soybean oil, tung oil, castor oil, linseed oil, hemp oil, cottonseed oil, sesame oil, rapeseed oil, peanut oil, camellia oil, olive oil, coconut oil, sardine oil: epoxidized soybean oil Epoxidized natural oils and fats such as:

Acrylic acid, butenoic acid, crotonic acid, vinylacetic acid, methacrylic acid, pentenoic acid, angelic acid, tibric acid, 2-pentenoic acid, 3-pentenoic acid, α-ethylacrylic acid, β-methylcrotonic acid, 4 -Pentenoic acid, 2-hexenoic acid, 2-methyl-2-pentenoic acid, 3
-Methyl-2-pentenoic acid, α-ethyl crotonic acid,
2,2-dimethyl-3-butenoic acid, 2-heptenoic acid, 2
-Octenoic acid, 4-decenoic acid, 9-undecenoic acid, 10
-Undecenoic acid, 4-dodecenoic acid, 5-dodecenoic acid, 4
-Tetradecenoic acid, 9-tetradecenoic acid, 9-hexadecenoic acid, 2-octadecenoic acid, 9-octadecenoic acid, eicosenoic acid, docosenoic acid, erucic acid, tetracosenoic acid,
Mycolic acid, 2,4-pentadienoic acid, 2,4-hexadienoic acid, diallylacetic acid, geranium acid, 2,4-
Decadienoic acid, 2,4-dodecadienoic acid, 9,12-hexadecadienoic acid, 9,12-octadecadienoic acid, hexadecatrienoic acid, linoleic acid, linolenic acid, octadecatrienoic acid, eicosadienoic acid, eicosatrieen Acid, eicosatetraenoic acid, ricinoleic acid, eleostearic acid, oleic acid, eicosapentaenoic acid, erucic acid, docosadienoic acid, docosatrienoic acid, docosatetraenoic acid, docosapentaenoic acid, tetracosenoic acid, hexacosenoic acid, hexacodienoic acid Unsaturated carboxylic acids such as octacosenoic acid and traacontenoic acid: esters of these unsaturated carboxylic acids, acid amides, anhydrides:

Allyl alcohol, crotyl alcohol,
Methyl vinyl carbinol, allyl carbinol, methyl propenyl carbinol, 4-penten-1-ol, 10-undecen-1-ol, propargyl alcohol, 1,4-pentadien-3-ol, 1,4-
Hexadiene-3-ol, 3,5-hexadiene-2
- ol, 2,4-hexadiene-1-ol, C _n H
_{2n-5 OH, C n H} 2n-7 OH, or C _n H _2n-9 OH (where, n is a positive integer) the alcohol represented by the 3-butene-l, 2-diol, 2,5-dimethyl -3-Hexene-2,5-diol, 1,5-hexadiene-3,4-
Unsaturated alcohols such as diols and 2,6-octadiene-4,5-diols: or unsaturated amines in which OH groups of such unsaturated alcohols are replaced with NH ₂ groups: or low-weight compounds such as butadiene and isoprene Coalescence (for example, one having an average molecular weight of 500 to 10,000): or high molecular weight (for example, one having an average molecular weight of 1)
Maleic anhydride, phenols, or amino groups, carboxyl groups, hydroxyl groups, epoxy groups, etc. introduced into 2,000 or more) and allyl isocyanate, etc. may be mentioned.

Needless to say, the definition of a compound having both an unsaturated group and a polar group also includes a compound containing two or more unsaturated groups and two or more polar groups (same or different). It is also possible to use two or more compounds as the component (c). Of these, more preferred are maleic anhydride, maleic acid, itaconic anhydride, unsaturated dicarboxylic acids such as itaconic acid and anhydrides thereof, unsaturated alcohols such as olein alcohol, and epoxidized natural oils and fats, and further preferred Are maleic anhydride, maleic acid, oleyl alcohol, epoxidized soybean oil and epoxidized linseed oil, particularly preferably maleic anhydride and a mixture of maleic anhydride and maleic acid.

The brominated polystyrene as the component (d) used in the present invention has a structural unit represented by the following general formula (2).

[0021]

[Chemical 3]

R ₁ , R ₂ , R ₃ , R _{4 in the} above general formula (2)
And R ₅ is a hydrogen atom, a bromine atom, an alkyl group having 1 to 5 carbon atoms or a brominated alkyl group having 1 to 5 carbon atoms,
At least one of R _{1 to} R ₅ is a bromine atom. n represents the total number of monomer units and is an integer of about 50 or more, preferably about 150 or more, more preferably about 250 or more. The bromine content of this compound used in the present invention is preferably 40% by weight or more from the viewpoint of flame retardancy. The brominated polystyrene used in the present invention may be obtained by polymerizing styrene that has been brominated in advance, or may be obtained by polymerizing styrene and then brominated, and one or more kinds can be used. Specific examples of the brominated polystyrene that can be used in the present invention include poly (2,6-dibromo) styrene,
Examples thereof include poly (2,4,6-tribromo) styrene and poly (pentabromo) styrene.

The brominated benzyl polyacrylate as the component (e) used in the present invention has a structural unit represented by the following general formula (3).

[0024]

[Chemical 4]

R ₁ , R ₂ , R ₃ , R ₄ and R ₅ in the general formula (3) are hydrogen atom, bromine atom, alkyl group having 1 to 5 carbon atoms or brominated alkyl group having 1 to 5 carbon atoms. And R ₁
At least one of R ₅ to R ₅ is a bromine atom. n represents the total number of monomer units and is an integer of about 50 or more, preferably about 150 or more, more preferably about 250 or more. The bromine content of this compound used in the present invention is preferably 40% by weight or more from the viewpoint of flame retardancy.

The brominated benzyl polyacrylate used in the present invention may be obtained by polymerizing benzyl acrylate that has been brominated in advance, or may be obtained by polymerizing benzyl acrylate and then brominated, and one kind or two or more kinds are used. You can Specific examples of the brominated benzyl polyacrylate that can be used in the present invention include poly (2,6-dibromobenzyl) acrylate, poly (2,4,6-tribromobenzyl) acrylate and poly (pentabromobenzyl) acrylate. Can be given.

The component (f) antimony compound used in the present invention may be inorganic or organic. For example, there are antimony oxide, antimony chloride, antimony phosphate, triphenylantimony, sodium antimonate, etc., and particularly preferred is antimony oxide.

The component (g) impact resistance improver optionally used in the present invention may be a natural or synthetic rubber-like substance. Examples of rubbers for use in the present invention include natural and synthetic rubbers such as polybutadiene, polyisoprene, or copolymers of such dienes with vinyl monomers such as vinyl aromatic monomers such as styrene. There is coalescence. Examples of suitable rubbers or rubber-like polymers include natural rubber, SBR type rubber, synthetic GR-N type rubber containing butadiene and acrylonitrile,
And synthetic rubbers made from butadiene, butadiene-styrene or isoprene, polychlorobutadienes such as neoprene: polyisobutylene and copolymers of isobutylene and butadiene or isoprene: polyisoprene: copolymers of ethylene and propylene and of these and butadiene Copolymers: Cyocol rubbers: Acrylic rubbers: Polyurethane rubbers: Dienes such as butadiene and isoprene and various monomers such as alkyl unsaturated esters (eg methyl methacrylate), unsaturated ketones such as methyl isopropenyl ketone, vinyl heterocycles such as vinyl. Copolymers with pyridine: polyether rubber: epichlorohydrin rubber and the like. Preferred rubbers are polybutadiene and rubbery copolymers of butadiene and styrene.

Particularly preferred is a styrene-butylene-styrene triblock copolymer having a styrene content of 10% by weight or more, or a hydride thereof. Or an ethylene-propylene rubber modified with an α, β-unsaturated carboxylic acid,
It is ethylene-butene rubber. Further, a core-shell elastomer having a crosslinked acrylic rubber as a core and an alkenyl aromatic polymer as a shell and / or an α, β-unsaturated carboxylic acid-modified rubber thereof can also be used, and two or more types thereof may be used in combination. It is possible.

[Composition Ratio of Constituents] The mixing ratio of each component in the present invention is as follows. The modified polyphenylene ether resin of the component (a) includes the component (a) and the component (b).
Is 10 to 90 parts by weight, preferably 20 to 80 parts by weight, based on 100 parts by weight. If it is less than 10 parts by weight, the heat resistance is insufficient, and if it exceeds 90 parts by weight, the impact strength is insufficient. The component (b) polyamide resin is 90 to 10 parts by weight based on 100 parts by weight of the total of the components (a) and (b),
It is preferably 80 to 20 parts by weight. If it is less than 10 parts by weight, the impact strength will be insufficient, and if it exceeds 90 parts by weight, the heat resistance will be insufficient. The amount of the compound having an unsaturated group and a polar group in the same molecule of the component (c) is preferably 0.01 to 10 parts by weight based on 100 parts by weight of the total of the components (a) and (b). And more preferably 0.1 to 10 parts by weight. If it is less than 0.01 parts by weight, the impact resistance is insufficient, and if it exceeds 10 parts by weight, the product appearance becomes poor.

The component (d) brominated polystyrene is
It is preferably 1 to 40 parts by weight, more preferably 3 to 30 parts by weight, and particularly preferably 3 to 25 parts by weight, based on 100 parts by weight of (a) + (b). If it is less than 1 part by weight, the flame retarding effect is thin, and if it exceeds 40 parts by weight, the product appearance is poor and the mechanical strength is poor. The brominated benzyl polyacrylate of component (e) is
The total amount of (a) + (b) is preferably 1 to 40 parts by weight, more preferably 3 to 30 parts by weight, and particularly preferably 3 to 25 parts by weight, based on 100 parts by weight. If it is less than 1 part by weight, the flame retarding effect is thin, and if it exceeds 40 parts by weight, the product appearance is poor and the mechanical strength is poor. Further, the component (d) and the component (e)
The total of (a) + (b) is 5 with respect to 100 parts by weight in total.
It is preferably from 50 to 50 parts by weight, more preferably 1
It is 0 to 40 parts by weight. If it is less than 5 parts by weight, the flame retarding effect is small, and if it exceeds 50 parts by weight, the product appearance is poor and the mechanical strength is poor. The weight ratio of component (d) to component (e) is preferably (d) / (e) of 1/9 to 9/1, and more preferably 2/8 to 8/2. If it is out of this range, the flame retarding effect is small.

The component (f) antimony compound is (a)
+ (B) It is preferably 1 to 30 parts by weight, more preferably 2 to 20 parts by weight, relative to 100 parts by weight. If it is less than 1 part by weight, the flame retarding effect is thin, and if it exceeds 30 parts by weight, the product appearance is poor and the mechanical strength is poor. The component (g) impact modifier is (a) + (b) total 100
The amount is preferably 0 to 30 parts by weight,
More preferably, it is 3 to 30 parts by weight. If it exceeds 30 parts by weight, rigidity, heat resistance, flame retardancy, etc. are deteriorated, which is not preferable.

The resin composition of the present invention contains, if necessary, an antioxidant, a weather resistance improver, a nucleating agent, a slip agent, various colorants, and an antistatic agent as long as the object of the present invention is not impaired. It is also possible to add auxiliary components such as a release agent.
Further, other inorganic fillers such as glass fiber, carbon fiber, mica, talc, calcium carbonate and whiskers can be added.

[Blending Method] As a blending method for obtaining the resin composition according to the present invention, generally, various methods of blending resins with each other or with a stabilizer or a colorant, and further with a resin and a filler are applied. be able to. For example, a powdery or granular component is uniformly dispersed by a mechanical mixing method such as a hexshell mixer, a ribbon mixer, a V blender, and a Nauter mixer, and then this mixture is mixed with a uniaxial extruder and a biaxial extruder. It is kneaded by a kneader having a usual melt-kneading function such as an extruder, a Banbury mixer, a roll, a kneader. The melt-kneading temperature is usually in the range of 180 to 370 ° C. The resin composition obtained as described above can be extruded into pellets after melt-kneading.

When the composition is melt-kneaded, a method of collectively kneading the entire composition, a method of providing a feed port in the middle of the extruder to feed from two or more locations, or some of the components in advance There are methods such as melt-kneading to obtain an intermediate composition, and melt-kneading the intermediate composition and the remaining components. A method of providing a feed port in the middle of the extruder to feed from two or more locations, or some of the components A preferred method is to melt-knead the mixture beforehand to obtain an intermediate composition, and melt-knead the intermediate composition and the remaining components.

[Application of the present invention] The composition of the present invention is useful as a material for a resin molded product, and the molding processing method is as follows.
It is not particularly limited, and can be easily molded by a molding method generally applied to thermoplastic resins, that is, a molding method such as extrusion molding, hollow molding, injection molding, sheet molding, thermoforming, rotational molding, or laminated molding. Of these, injection molding is the most preferable.

[0037]

EXAMPLES The present invention will be described below with reference to examples, but all "parts" in the following description mean parts by weight. Among the components shown in Table-1, the intermediate composition was blended in a predetermined ratio and thoroughly mixed with a Henschel mixer under a nitrogen atmosphere, and then the counter-rotating twin-screw extruder (Japan Steel Works, Ltd.) Made, caliber 44mmφ, L / D = 3
0) was melt-kneaded at a cylinder temperature of 250 ° C., cooled and pelletized to obtain an intermediate composition. This intermediate composition was dried at 110 ° C. for 8 hours, cooled, mixed with other components shown in Table 1 at a predetermined ratio, thoroughly mixed with a Henschel mixer in a nitrogen atmosphere, and then mixed with a bidirectional rotary biaxial extrusion. Machine (manufactured by Japan Steel Works Ltd., caliber 44 mmφ, L / D = 3)
0) was melt-kneaded at a cylinder temperature of 230 ° C., cooled and pelletized to obtain a composition. This composition was dried at 110 ° C. for 8 hours, and then an injection molding machine manufactured by Japan Steel Works, Ltd. (clamping force 100
Injection molding using T) to prepare a test piece for measuring physical properties,
An evaluation was made.

[0038]

[Table 1]

Various physical properties in each Example and Comparative Example are measured by the following methods. 1) Izod impact Measured in accordance with JIS K-7110. 2) Flexural modulus and strength Measured according to JIS K-7203. 3) Tensile strength Measured according to JIS K-7207. 4) Heat distortion temperature It was measured under a load of 4.6 kg according to JIS K-7207. 5) Flammability A UL94 vertical burning test was performed using injection molded test pieces.

The materials used are as follows. Polyphenylene ether resin (a) a-1: manufactured by Nippon Polyether Co., Ltd., intrinsic viscosity 0.30
dl / g (30 ° C., in chloroform) a-2: Nippon Polyether Co., Ltd., intrinsic viscosity 0.51
dl / g (30 ° C., in chloroform) Polyamide resin (b) b-1: MC112L manufactured by Kanebo Ltd. [Crystalline polyamide: relative viscosity 2.7 (25 ° C., 98%)
Concentrated sulfuric acid)] b-2: MC100L manufactured by Kanebo Ltd. [Crystalline polyamide: relative viscosity 2.3 (25 ° C., 98%)
(In concentrated sulfuric acid)] Maleic anhydride (c): First-class commercial reagent product

Brominated polystyrene (d): Pyrocheck 68PB manufactured by Ferro (bromine content: 66%) Brominated benzyl polyacrylate (e): PBB-PA manufactured by Dead Sea Brom (bromine content: 72%) Antimony oxide (f ): Sumitomo Metal Mining Co., Ltd. Antimony trioxide Impact modifier (g) g-1: Nippon Synthetic Rubber Co., Ltd., maleic acid modified ethylene propylene rubber T7771Y g-2: Shell Chemical Co., hydrogenated styrene -Butadiene-
Styrene rubber Kraton G1651 Other flame retardants 1): Triphenyl phosphate 2): Decabromodiphenyl ether 3): Next to red

FIG. 1 shows Examples-1, 2, 3 and Comparative Example-
5 is a plot of flame retardancy evaluation results of 5 types of molded test pieces made of the resin compositions 1 and 2. As is clear from this figure, by using brominated polystyrene and brominated polybenzyl polyacrylate together as a flame retardant,
It is possible to obtain high flame retardancy that could not be obtained by each.

[0043]

As is apparent from the above description and Examples, the thermoplastic resin composition of the present invention has high flame retardancy without impairing the heat resistance and mechanical properties of the resin. There is. The composition of the present invention is used for electric parts, exterior parts such as general equipment, structural parts, and mechanical parts. To give a concrete example of its use, it is useful as a housing or structural part for audio, video tape recorders, stereos, televisions, etc., and as mechanical parts such as gears, cams, levers, etc. Further, it is also useful as a housing for various electrical and electronic parts such as connectors, switches and relays, and other OA equipment such as cameras, radios, facsimiles and computers.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing flame retardancy evaluation results of molded test pieces made of the resin compositions of Examples-1, 2, 3 and Comparative Examples-1, 2.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location C08L 77/00 LQS 9286-4J LQV 9286-4J // C08L 33/16 LJA 7921-4J 51/04 LDY 7142- 4J (C08L 71/12 77:00 25:18 33:14) (C08L 77/00 71:12 25:18 33:14)

Claims (1)

[Claims] 1. A polyphenylene ether resin (a) 10 to
90 parts by weight and (b) 90 to 10 parts by weight of polyamide resin, for a total of 100 parts by weight, (c) 0.01 to 10 parts by weight of a compound having an unsaturated group and a polar group in the same molecule, (d) 1 to 40 parts by weight of brominated polystyrene, 1 to 40 parts by weight of (e) brominated benzyl polyacrylate, 1 to 30 parts by weight of (f) antimony compound, and (g) 0% of impact modifier. A flame-retardant resin composition containing 30 to 30 parts by weight.