JPH11349824A - Flame-retarded resin composition and molded article therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compsn. with excellent flowability, mechanical characteristics and heat resistance, by incorporating a specified amt. of a specific free radical generator into a thermoplastic resin. SOLUTION: 100 pts.wt. of a thermoplastic resin, pref. a PS resin, polyester, polybutylene terephthalate, or polyamide, is made to contain 0.01-5 pts.wt. of a free radical generator which is expressed by formula V and contains 5-20 mole % of one or more of compds. expressed by formulae I through IV. In the formula, X is H, a 1-10C alkyl, alkoxy, carboxyl, hydroxyl, amino, nitrile, nitro, or epoxy; Y and Z are each H or a group of formula VI; n is 1-5; and m is 1 or more. A pref. compsn. comprises a blend of 100 pts.wt. of this compsn. and 1-50 pts.wt. of a flame retardant. The flame retardant is pref. a phosphorus- based, nitrogen-based, or halogen-based flame retardant. This compsn. can constitute electric/electronic parts, automobile parts, machinery mechanic parts, and molded articles as the housings and parts of OA and housed equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin composition having excellent flame retardancy and fluidity without impairing the mechanical properties (impact resistance, rigidity, heat resistance) inherent in the thermoplastic resin. .

[0002]

2. Description of the Related Art Plastics have excellent mechanical properties,
Due to its moldability and electrical insulation, it is used in a wide range of fields including home electric appliances, OA appliances, automobiles and other parts. However, most of plastics are flammable, and various techniques have been proposed for flame retardancy due to safety issues.

[0003] Generally, a method is employed in which a halogen-based flame retardant such as a bromine compound having a high flame-retardant efficiency and antimony oxide are blended with a resin to make the resin flame-retardant. However,
The antimony compound used as a flame retardant aid is an infusible inorganic compound, and therefore, when blended in a thermoplastic resin, there is a problem that the inherent toughness, impact strength, and fluidity of the thermoplastic resin are reduced. Was. On the other hand, when the antimony compound which causes the deterioration of the physical properties is not used, there is a problem that the flame retardancy of the thermoplastic resin is remarkably reduced.

Japanese Unexamined Patent Publication (Kokai) No. 8-85756 discloses a method for blending a halogen-containing phosphoric acid ester as a method for making a thermoplastic resin flame-retardant without using an infusible flame-retardant auxiliary. As a method for improving the toughness of a flame-retardant resin composition flame-retarded with a halogen-based flame retardant and an antimony compound, a method of blending an elastomer is disclosed in Japanese Patent Application Laid-Open No. H8-208,878.
No. 113716.

[0005] However, the method of blending the halogen-containing phosphate ester has the problems that the flame retardancy is not sufficiently imparted and that the amount of decomposed gas when heated and retained is large. Further, the method in which the elastomer is blended has a problem that it is difficult to achieve both flame retardancy and toughness. These methods also have problems such as a large amount of smoke generated during combustion.

Therefore, in order to overcome these disadvantages of halogen-based flame retardants, a flame-retardant resin containing no halogen has been strongly desired in recent years.

As a method for making a thermoplastic resin flame-retardant without using a chlorine or bromine-based flame retardant, a rubber-reinforced polystyrene resin is mixed with a polyhydroxy compound such as ammonium polyphosphate and pentaerythritol and a silane coupling agent. The method is disclosed in JP-A-5-140412. Also, a method of blending a melamine-coated ammonium polyphosphate and a specific nitrogen-containing organic compound with a thermoplastic resin is disclosed in JP-A-6-340815.
A method of blending a small amount of a phenol resin and a flame retardant in a thermoplastic resin is disclosed in Japanese Patent Application Laid-Open No. 7-53879.

However, the composition described in Japanese Patent Application Laid-Open No. Hei 5-140412 cannot provide sufficient flame retardancy, and furthermore, because of the deterioration of mechanical properties and the use of polyhydric alcohol compounds, mold contamination during molding and molding. The product has a problem that stickiness due to moisture absorption occurs. Japanese Patent Application Laid-Open No. 6-340815
The compositions described in Japanese Patent Application Laid-Open Publication No. 7-53879 and Japanese Patent Application Laid-Open No. 7-53879 have a problem that a polystyrene resin cannot obtain sufficient flame retardancy.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a resin composition which imparts high flame retardancy to a thermoplastic resin and has excellent fluidity, mechanical properties and heat resistance. With the goal.

[0010]

Means for Solving the Problems According to the present invention, as a result of intensive studies to solve the above-mentioned problems, a flame retardant is specifically imparted by adding a radical generator containing a specific component to a thermoplastic resin. It has been found that it is possible and has excellent fluidity, mechanical properties, impact resistance and heat resistance.

That is, the present invention relates to “(A) 100 parts by weight of a thermoplastic resin, (B) the following general formula (1)
A radical generator represented by the following general formula (5) containing 5 to 20 mol% of one or more compounds selected from the compounds (4); Flammable resin composition.

Embedded image (X is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group, a carboxyl group, a hydroxyl group, an amino group,
It represents a nitrile group, a nitro group, or an epoxy group. Y and Z represent the same or different hydrogen atoms or a cumenyl group substituted with X. Further, n is an integer of 1 to 5, and m is an integer of 1 or more. )

[0012]

Embedded image (X is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group, a carboxyl group, a hydroxyl group, an amino group,
It represents a nitrile group, a nitro group, or an epoxy group. N is an integer of 1 to 5. ) ".

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The resin composition of the present invention will be specifically described below.

The thermoplastic resin (A) of the present invention is a synthetic resin which exhibits fluidity when heated, and can be molded by utilizing this.

Specific examples thereof include polystyrene resins, polystyrene resins such as styrene / acrylonitrile copolymer, acrylonitrile / butadiene / styrene copolymer (ABS resin), polyester resins, liquid crystal polyester resins, polycarbonate resins, polyamide resins, and the like. Resin, polyphenylene oxide resin, modified polyphenylene oxide resin, polyphenylene sulfide resin, polyoxymethylene resin, phenoxy resin, phenol resin, polypropylene resin, polyolefin resin such as polyethylene, ethylene / propylene resin, ethylene /
1-butene resin, ethylene / propylene / non-conjugated diene resin, ethylene / ethyl acrylate resin, ethylene / glycidyl methacrylate resin, ethylene / vinyl acetate /
Glycidyl methacrylate resin, ethylene / vinyl acetate /
Glycidyl methacrylate resin, ethylene / propylene-
g-maleic anhydride resin, polyester polyether elastomer, polyester polyester elastomer and other elastomers, or a mixture of two or more of these thermoplastic resins, such as polystyrene resin, styrene / acrylonitrile copolymer, acrylonitrile / butadiene / styrene. Polystyrene resin such as copolymer (ABS resin), modified polyphenylene oxide resin, polyester resin, polyamide resin, polycarbonate resin, phenoxy resin, polyphenylene sulfide resin,
One or a mixture of two or more selected from phenolic resins is preferred, and more preferably a polystyrene resin,
A polystyrene resin such as a styrene / acrylonitrile copolymer, an acrylonitrile / butadiene / styrene copolymer (ABS resin), a modified polyphenylene oxide resin, a polyester resin, a polyamide resin, a polycarbonate resin, a phenoxy resin, or a phenol resin; It is a mixture of two or more.

Among the above thermoplastic resins (A), the polyester resins are essentially polycondensates of dicarboxylic acids and glycols, ring-opening polymers of cyclic lactones, polycondensates of hydroxycarboxylic acids, and dibasic acids. And polycondensates of glycol and the like. Specifically, polyethylene terephthalate resin, polypropylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate resin, polybutylene naphthalate resin, polycyclohexane dimethylene terephthalate resin and polyethylene-1 , 2-bis (phenoxy) ethane-4,4'-dicarboxylate resin, and polyethylene-1,2
-Bis (phenoxy) ethane-4,4'-dicarboxylate resin, polyethylene isophthalate / terephthalate resin, polybutylene terephthalate / isophthalate resin, polybutylene terephthalate / decane dicarboxylate resin and polycyclohexane dimethylene terephthalate / isophthalate Examples thereof include copolymers and mixtures of resins. Particularly preferred polyester resins for the present invention are polyethylene terephthalate resins,
Examples thereof include a polypropylene terephthalate resin, a polybutylene terephthalate resin, and a polyethylene naphthalate resin, and a polybutylene terephthalate (PBT) resin is more preferable.

Although the molecular weight of such a polyester resin is not particularly limited, it is generally necessary to use an intrinsic viscosity of 0.1 to 3.0 measured at 25 ° C. using a phenol / tetrachloroethane 1: 1 mixed solvent. But preferably 0.25 to 2.5, particularly preferably 0.4 to 2.2.
5

Among the thermoplastic resins (A), examples of the polyamide resin include a ring-opened polymer of a cyclic lactam, a polycondensate of an aminocarboxylic acid, and a polycondensate of a dibasic acid and a diamine. Specifically, nylon 6, nylon 66, nylon 46, nylon 610, nylon 61
2, aliphatic polyamides such as nylon 11, nylon 12, and poly (meta-xylene adipamide) (hereinafter referred to as MXD-6
Abbreviated), poly (hexamethylene terephthalamide)
(Hereinafter abbreviated as 6T), poly (nonamethylene terephthalamide) (hereinafter abbreviated as 9T), poly (hexamethylene isophthalamide) (hereinafter abbreviated as 6I), poly (tetramethylene isophthalamide) (hereinafter abbreviated as 4I) and the like. Examples thereof include aliphatic-aromatic polyamides, and copolymers and mixtures thereof. Particularly preferred polyamides for the present invention are nylon 6, nylon 66 and nylon 6/6.
6 copolymer, nylon 66 / 6T copolymer, nylon 6
T / 12 copolymers can be mentioned.

Although the molecular weight of such a polyamide resin is not particularly limited, a relative viscosity of 1.7 to 4.5 as measured at a concentration of 1% in 25% sulfuric acid in 98% sulfuric acid can be used. Is 2.0 to 4.0, particularly preferably 2.
0 to 3.5.

Among the thermoplastic resins (A), polystyrene resins include polystyrene, styrene / acrylonitrile copolymer, rubber-modified styrene resin, and a polymer blend of rubber-modified styrene resin and polyphenylene oxide (modified polyphenylene oxide). Oxide resin).

Here, the rubber-modified styrenic resin refers to a graft polymer in which a rubbery polymer is dispersed in a fine particle form in a matrix composed of a vinyl aromatic polymer. It is obtained by adding an aromatic vinyl monomer and, if necessary, a vinyl monomer copolymerizable therewith, and subjecting the monomer mixture to known bulk polymerization, bulk suspension polymerization, solution polymerization, or emulsion polymerization. .

Examples of such a rubber-modified styrene resin include impact-resistant polystyrene, ABS resin, and AA
S resin (acrylonitrile-acryl rubber-styrene copolymer), AES resin (acrylonitrile-ethylene propylene rubber-styrene copolymer) and the like are exemplified.

As such a rubber-modified styrenic resin, a resin having a structure in which a (co) polymer containing a styrene monomer is grafted to a rubbery polymer, and a (co) polymer containing a styrene monomer are used. It includes those having a structure in which the polymer is not grafted to the rubbery polymer.

Specifically, 95 to 20 parts by weight of a monomer or monomer mixture containing 20% by weight or more of an aromatic vinyl monomer is graft-polymerized to 5 to 80 parts by weight of a rubbery polymer. The obtained (a) graft (co) polymer is obtained by polymerizing 5 to 100% by weight of a monomer or monomer mixture containing at least 20% by weight of an aromatic vinyl monomer and (b).
Those comprising from 0 to 95% by weight of a vinyl (co) polymer are preferred.

As the rubbery polymer, those having a glass transition temperature of 0 ° C. or less are suitable, and diene rubbers are preferably used. Specifically, polybutadiene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, styrene-butadiene block copolymer,
Examples include diene rubbers such as butyl acrylate-butadiene copolymer, acrylic rubbers such as polybutyl acrylate, polyisoprene, and ethylene-propylene-diene terpolymer. Among them, polybutadiene or butadiene copolymer is preferred.

The rubber particle diameter of the rubbery polymer is not particularly limited, but the weight average particle diameter of the rubber particles is 0.15 to 0.6.
μm, especially 0.2 to 0.55 μm, is preferable because of its excellent impact resistance. Among them, 0.20 to 0.25 μm and 0.5
The weight ratio to 0 to 0.65 μm is 90:10 to 60:40.
Is preferable because the impact resistance and falling weight impact of a thin molded product are remarkably excellent.

The average weight particle size of the rubber particles is "Ru
bber Age Vol. 88p. 484-490
(1960) by E.I. Schmidt, P .; H. B
sodium salt alginate method described in “Idison” (particles having a cumulative weight fraction of 50% from the cumulative weight fraction of the creamed weight ratio and the sodium alginate concentration utilizing the fact that the particle size of polybutadiene to be creamed varies depending on the concentration of sodium alginate) (Determining the diameter).

As the aromatic vinyl monomer, styrene,
Examples include α-methylstyrene, vinyltoluene, o-ethylstyrene, pt-butylstyrene, etc., with styrene being particularly preferred.

As monomers other than the aromatic vinyl monomers, vinyl cyanide monomers are used for the purpose of further improving impact resistance, and (meth) acrylic monomers are used for the purpose of improving toughness and color tone. Acid ester monomers are preferably used. Examples of the vinyl cyanide-based monomer include acrylonitrile, methacrylonitrile, ethacrylonitrile, and the like, and acrylonitrile is particularly preferable. Examples of the (meth) acrylate-based monomer include methyl and ethyl esters of acrylic acid and methacrylic acid with ethyl, propyl, n-butyl and i-butyl. Particularly, methyl methacrylate is preferred.

If necessary, other vinyl monomers,
For example, maleimide monomers such as maleimide, N-methylmaleimide, and N-phenylmaleimide can be used.

The monomer or monomer mixture used in (a) the graft (co) polymer is an aromatic vinyl-based monomer of 20% by weight or more, preferably 50% by weight or more. When the proportion of the aromatic vinyl monomer is less than 20% by weight, the impact resistance of the resin composition is poor, which is not preferable. When a vinyl cyanide monomer is mixed, the amount is preferably 60% by weight or less, and more preferably 50% by weight or less, from the viewpoint of moldability of the resin composition. When a (meth) acrylate-based monomer is mixed, the amount is preferably 80% by weight or less, more preferably 75% by weight or less from the viewpoint of toughness and impact resistance. The total amount of the aromatic vinyl-based monomer, vinyl cyanide-based monomer and (meth) acrylate-based monomer in the monomer or the monomer mixture is 95 to 20% by weight, more preferably 90-3
0% by weight.

(A) The ratio of the rubbery polymer to the monomer mixture in obtaining the graft (co) polymer is preferably at least 5 parts by weight of the rubbery polymer based on 100 parts by weight of the total graft copolymer. Is used in an amount of 10 parts by weight or more, 80 parts by weight or less, preferably 70 parts by weight or less. The amount of the monomer or monomer mixture is at most 95 parts by weight, preferably at most 90 parts by weight, at least 20 parts by weight, preferably at least 30 parts by weight. If the proportion of the rubbery polymer is less than 5 parts by weight, the impact resistance of the resin composition is inferior, and if it exceeds 80 parts by weight, the impact resistance of the resin composition and the appearance of a molded product are undesirably impaired.

(A) The graft (co) polymer can be obtained by a known polymerization method. For example, it can be obtained by a method in which a mixture of a monomer and a chain transfer agent and a solution of a radical generator dissolved in an emulsifier are continuously supplied to a polymerization vessel in the presence of a rubbery polymer latex to carry out emulsion polymerization.

(A) The graft (co) polymer is a material containing a non-grafted copolymer in addition to a material having a structure obtained by grafting a monomer or a monomer mixture to a rubbery polymer. It is. (A) The graft ratio of the graft (co) polymer is not particularly limited, but is preferably from 20 to 80% by weight, particularly preferably from 25 to 50% by weight in order to obtain a resin composition having excellent impact resistance and gloss. .

Here, the graft ratio is calculated by the following equation. Graft ratio (%) = <amount of vinyl copolymer graft-polymerized on rubbery polymer> / <rubber content of graft copolymer> × 100

The properties of the ungrafted (co) polymer are not particularly limited, but the intrinsic viscosity [η] (measured at 30 ° C.) of the methyl ethyl ketone-soluble component is 0.25-0.
6 dl / g, especially in the range of 0.25 to 0.5 dl / g,
Since a resin composition having excellent impact resistance can be obtained, it is preferably used.

(B) The vinyl (co) polymer is a copolymer essentially containing an aromatic vinyl monomer. Examples of the aromatic vinyl monomer include styrene, α-methylstyrene, p-methylstyrene, t-butylstyrene, vinyltoluene, o-ethylstyrene, and the like, with styrene being particularly preferred. One or more of these can be used.

As a monomer other than the aromatic vinyl monomer, a vinyl cyanide monomer is preferably used for the purpose of further improving impact resistance. For the purpose of improving toughness and color tone, (meth) acrylate monomers are preferably used. Examples of the vinyl cyanide-based monomer include acrylonitrile, methacrylonitrile, ethacrylonitrile, and the like, and acrylonitrile is particularly preferable.
(Meth) acrylic ester monomers include acrylic acid and methacrylic acid methyl, ethyl, propyl, n
Examples thereof include an esterified product with -butyl and i-butyl, and methyl methacrylate is particularly preferable.

As other vinyl monomers copolymerizable therewith, maleimide monomers such as maleimide, N-methylmaleimide and N-phenylmaleimide can be used as required.

(B) The ratio of the aromatic vinyl monomer which is a component of the vinyl (co) polymer is 20 to the total monomer.
% By weight, preferably 50% by weight or more.
When the proportion of the aromatic vinyl monomer is less than 20% by weight, the impact resistance of the resin composition is poor, which is not preferable. When a vinyl cyanide monomer is mixed, the content is preferably 60% by weight or less, more preferably 50% by weight or less, from the viewpoint of impact resistance and fluidity. When a (meth) acrylate monomer is mixed, the content is preferably 80% by weight or less, and more preferably 75% by weight, from the viewpoint of toughness and impact resistance.
The following are preferably used. When other vinyl monomers copolymerizable therewith are mixed, 60% by weight
Or less, more preferably 50% by weight or less.

Although the characteristics of the vinyl (co) polymer are not limited, the intrinsic viscosity [η] (methyl ethyl ketone solvent, 30 ° C.
Measurement) is 0.4 to 0.65 dl / g, especially 0.45 to
In the range of 0.55 dl / g, an N, N-dimethylformamide solvent, when measured at 30 ° C., 0.35 dl / g.
A resin composition in the range of from 0.85 dl / g to 0.45 dl / g, particularly from 0.45 to 0.7 dl / g, is preferred, since a resin composition having excellent impact resistance and moldability can be obtained.

The method for producing the vinyl (co) polymer is not particularly limited, and includes bulk polymerization, suspension polymerization, emulsion polymerization, and bulk polymerization.
Conventional methods such as a suspension polymerization method and a solution-bulk polymerization method can be used.

In the present invention, a carboxyl group, a hydroxyl group, an epoxy group, an amino group,
A modified vinyl polymer containing at least one functional group selected from oxazoline groups (hereinafter abbreviated as a modified vinyl polymer) can also be used. The modified vinyl polymer has a structure obtained by polymerizing or copolymerizing one or more vinyl monomers, and has a carboxyl group, a hydroxyl group, an epoxy group,
It is a polymer containing at least one functional group selected from an amino group and an oxazoline group. The content of the compound containing these functional groups is not limited, but is preferably 0.01 to 2 parts by weight per 100 parts by weight of the modified vinyl polymer.
A range of 0% by weight is preferred.

The method for introducing a carboxyl group into the modified vinyl polymer is not particularly limited, but may be a carboxyl group such as acrylic acid, methacrylic acid, maleic acid, maleic monoethyl ester, maleic anhydride, phthalic acid and itaconic acid. Or a method of copolymerizing a vinyl monomer having an anhydrous carboxyl group with a predetermined vinyl monomer, γ, γ
Polymerization generators having a carboxyl group such as' -azobis (γ-cyanovaleic acid), α, α'-azobis (α-cyanoethyl) -p-benzoic acid and succinic acid peroxide and / or thioglycolic acid, α-mercapto Using a polymerization degree controlling agent having a carboxyl group such as propionic acid, β-mercaptopropionic acid, α-mercapto-isobutyric acid and 2,3 or 4-mercaptobenzoic acid, a predetermined vinyl monomer is (co) A method of polymerizing, and a copolymer of a (meth) acrylate monomer such as methyl methacrylate and methyl acrylate with an aromatic vinyl monomer and, if necessary, a vinyl cyanide monomer. A method of saponifying with an alkali or the like can be used.

There are no particular restrictions on the method of introducing the hydroxyl group. For example, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 3,4,5,6-pentahydroxyhexyl, 2,3,4,5,6-pentahydroxyhexyl methacrylate, 2,3,4,5-acrylic acid
Tetrahydroxypentyl, 2,3,4, methacrylic acid
5-tetrahydroxypentyl, 3-hydroxy-1-
Propene, 4-hydroxy-1-butene, cis-4-hydroxy-2-butene, trans-4-hydroxy-2
-Butene, 3-hydroxy-2-methyl-1-propene, cis-5-hydroxy-2-pentene, trans-
5-hydroxy-2-pentene, 4-dihydroxy-2
-A method of copolymerizing a vinyl monomer having a hydroxyl group such as butene with a predetermined vinyl monomer can be used.

The method for introducing an epoxy group is not particularly limited. For example, glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, glycidyl itaconate, allyl glycidyl ether, styrene-p
-A method of copolymerizing a vinyl monomer having an epoxy group such as glycidyl ether or p-glycidyl styrene with a predetermined vinyl monomer can be used.

The method of introducing an amino group is not particularly limited. For example, acrylamide, methacrylamide, N-methylacrylamide, butoxymethylacrylamide, N-propylmethacrylamide, aminoethyl acrylate, propylaminoethyl acrylate, methacryl Dimethylaminoethyl acrylate, ethylaminopropyl methacrylate, phenylaminoethyl methacrylate, cyclohexylaminoethyl methacrylate, N-vinyldiethylamine, N-acetylvinylamine, allylamine, methallylamine, N-methylallylamine, p-
A method of copolymerizing a vinyl monomer having an amino group such as aminostyrene or a derivative thereof with a predetermined vinyl monomer can be used.

The method of introducing an oxazoline group is not particularly limited. For example, vinyl having an oxazoline group such as 2-isopropenyl-oxazoline, 2-vinyl-oxazoline, 2-acryloyl-oxazoline and 2-styryl-oxazoline. For example, a method of copolymerizing a monomer with a predetermined vinyl monomer can be used.

The properties of the modified vinyl polymer are not limited, but the intrinsic viscosity [η] (methyl ethyl ketone solvent, 30 ° C.
Measurement) is 0.2 to 0.65 dl / g, especially 0.35 to
In the range of 0.6 dl / g, an N, N-dimethylformamide solvent at a temperature of 30 ° C.
A resin composition in the range of 0.9 dl / g, particularly 0.4 to 0.75 dl / g is preferable because excellent flame retardancy, impact resistance and moldability can be obtained.

The radical generator of the present invention is represented by
A compound represented by the following general formula (5), which has a CC bond and generates a radical by light or heat.

[0051]

Embedded image Here, X represents a general substituent such as a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group, a carboxyl group, a hydroxyl group, an amino group, a nitrile group, a nitro group, and an epoxy group. Among them, hydrogen atom, methyl group, ethyl group,
A methoxy group, a hydroxyl group and a nitrile group are preferred,
Particularly, a hydrogen atom and a methyl group are preferable. Also, n is 1
Is an integer of up to 5.

The flame retardancy can be improved by adding a small amount of the radical generator represented by the above general formula (5) to the thermoplastic resin.
By using the radical generator (B) represented by the general formula (5) containing one or a mixture of two or more compounds selected from (4), more excellent flame retardancy and fluidity can be obtained. Was found to exhibit the property.

[0053]

Embedded image Here, X is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group, a carboxyl group, a hydroxyl group, an amino group, a nitrile group, a nitro group, an epoxy group,
It represents a general substituent such as an oxycarbonyl group. Y and Z represent the same or different hydrogen atoms or a cumenyl group substituted with X. N is an integer of 1 to 5, m
Is an integer of 1 or more.

The content of one or a mixture of two or more compounds selected from the general formulas (1) to (4) in the radical generator represented by the general formula (5) is expressed by the general formula (5). Radical generator and general formula (1) to
5 to 20%, more preferably 7 to 10%, based on the total number of moles of one or a mixture of two or more compounds selected from (4).
15%. If the content exceeds 20%, the flame retardancy tends to decrease, and if it is less than 5%, the fluidity decreases, which is not preferable.

The above general formulas (1) to (4) of the present invention are described below.
The amount of the radical generator (B) represented by the general formula (5) containing one or a mixture of two or more compounds selected from (4) is usually 0 to 100 parts by weight of the thermoplastic resin. 0.01 to 5 parts by weight, preferably 0.01 to 3 parts by weight
Parts by weight, more preferably 0.01 to 1 part by weight.

The radical generator (B) represented by the above general formula (5) containing one or a mixture of two or more compounds selected from the above general formulas (1) to (4) is added to a thermoplastic resin. By blending in a small amount, drip is accelerated during combustion, high flame retardancy can be imparted, and fluidity can be improved. However, it is not preferable because the flame retardancy tends to decrease when the compound is excessively mixed. Further, the resin composition of the present invention obtains more excellent flame retardancy by further adding (C) a flame retardant. be able to.

The flame retardant (C) used in the present invention is not particularly limited, and examples thereof include phosphorus-based flame retardants, nitrogen-based flame retardants, metal oxides and metal hydroxides, and hydrates of metal hydroxides. And halogen-based flame retardants. Among them, phosphorus-based flame retardants, nitrogen-based flame retardants, and halogen-based flame retardants can be preferably used.

The phosphorus-based flame retardant used in the present invention is not particularly limited as long as it is an organic or inorganic compound containing phosphorus. For example, red phosphorus, ammonium polyphosphate, polyphosphazene, phosphate, phosphonate, phosphinate,
Phosphine oxide and the like. Among them, ammonium polyphosphate and phosphate are preferable, and the following formula (6)
The aromatic phosphate represented by the following formula (1) can be more preferably used.

[0059]

Embedded image (However, the above formulas R ^{5 to} R ¹² represent the same or different hydrogen atoms or alkyl groups having 1 to 5 carbon atoms. Ar
¹ , Ar ² , Ar ³ and Ar ⁴ represent the same or different phenyl groups or phenyl groups substituted with halogen-free organic residues. Y is a direct bond, O, S, SO
₂ , C (CH ₃ ) ₂ , CH ₂ , and CHPh, and Ph represents a phenyl group. N is an integer of 0 or more. Also, k,
m is an integer of 0 or more and 2 or less, and k + m is an integer of 0 or more and 2 or less. )

First, the structure of the flame retardant represented by the above formula (6) will be described. In the formula (6), n is an integer of 0 or more. K and m are each an integer of 0 or more and 2 or less, and k + m is an integer of 0 or more and 2 or less,
Preferably, k and m are each an integer of 0 or more and 1 or less, and particularly preferably, k and m are each 1.

In the above formula (6), R ^{5 to} R ¹² represent the same or different hydrogen or an alkyl group having 1 to 5 carbon atoms. Here, specific examples of the alkyl group having 1 to 5 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group and a tert-
Butyl group, n-isopropyl, neopentyl, tert
A pentyl group, 2-isopropyl, neopentyl, te
rt-pentyl group, 3-isopropyl, neopentyl,
a tert-pentyl group, neoisopropyl, neopentyl, tert-pentyl group and the like.
A methyl group and an ethyl group are preferable, and hydrogen is particularly preferable.

Ar ¹ , Ar ² , Ar ³ and Ar ⁴ represent the same or different phenyl groups or phenyl groups substituted by halogen-free organic residues. Specific examples include a phenyl group, a tolyl group, a xylyl group, a cumenyl group,
Examples include a mesityl group, a naphthyl group, an indenyl group, an anthryl group, and the like. A phenyl group, a tolyl group, a xylyl group, a cumenyl group, and a naphthyl group are preferable, and a phenyl group, a tolyl group, and a xylyl group are particularly preferable.

Y is a direct bond, O, S, SO ₂ , C
(CH ₃ ) ₂ , CH ₂ , and CHPh, and Ph represents a phenyl group.

The nitrogen-based flame retardant is not particularly limited as long as it is an organic or inorganic compound containing a nitrogen atom, and among them, a triazine-based compound or an adduct of cyanuric acid or isocyanuric acid with a triazine-based compound is preferable. Can be used.

The triazine-based compound is a compound represented by the following general formula (7).

[0066]

Embedded image (However, in the above formula, R ¹³ , R ¹⁴ , R ¹⁵ , and R ¹⁶ are the same or different and are a hydrogen alkyl group, an aralkyl group, a cycloalkyl group, or —CONH _{2. In} addition, R represents —NR ¹³ in the above formula. R ¹⁴ or the same group as —NR ¹⁵ R ¹⁶ , or independently of these, hydrogen, an aryl group, an alkyl group, an aralkyl group, a cycloalkyl group, —NH ₂ , or —CO ₂
This is a group selected from NH ₂ . )

In the general formula (7), R ¹³ , R ¹⁴ , R
¹⁵ and R ¹⁶ are the same or different, hydrogen, aryl group, alkyl group, aralkyl group, cycloalkyl group, or -C
ONH ₂ . Here, the aryl group has 6 to 6 carbon atoms.
Preferred are those having 15 carbon atoms, 1 to 10 carbon atoms as alkyl groups, 7 to 16 carbon atoms as aralkyl groups, and 4 to 15 cycloalkyl groups. In addition, R is -NR ¹³ R ¹⁴ or -NR ¹⁵ R ¹⁶ the same groups in the above formula or their independent hydrogen, an aryl group, an alkyl group, an aralkyl group, a cycloalkyl group, -NH _2,
Or a group selected from -CONH _2, where the aryl groups those having from 6 to 15 carbon atoms, those having 1 to 10 carbon atoms as the alkyl group, the aralkyl group as 7 to 16 carbon atoms, 4 to 15 as the cycloalkyl group
Are preferred.

Specific examples of R ¹³ , R ¹⁴ , R ¹⁵ and R ¹⁶ include hydrogen, phenyl, p-toluyl, α-naphthyl, β-naphthyl, methyl, ethyl and n-propyl. Group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, hydroxymethyl group, methoxymethyl group, benzyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, 2-methyl-1-pentyl group, Examples thereof include a 4-methyl-1-cyclohexyl group and an amide group, and among them, hydrogen, a phenyl group, a methyl group, a hydroxymethyl group, a methoxymethyl group, a benzyl group, and an amide group are preferable.

Further, specific examples of R include an amino group,
Amide group, methylamino group, dimethylamino group, ethylamino group, diethylamino group, mono (hydroxymethyl) amino group, di (hydroxymethyl) amino group, mono (methoxymethyl) amino group, di (methoxymethyl) amino group, Phenylamino group, diphenylamino group, hydrogen, phenyl group, p-toluyl group, α-naphthyl group, β
-Naphthyl group, methyl group, ethyl group, n-propyl group,
Isopropyl group, n-butyl group, sec-butyl group, t
tert-butyl group, benzyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, 2-methyl-1-
Examples thereof include a pentyl group and a 4-methyl-1-cyclohexyl group, among which hydrogen, an amino group, an amide group, a methyl group, a mono (hydroxymethyl) amino group, a di (hydroxymethyl) amino group, and a mono (methoxymethyl) group An amino group, a di (methoxymethyl) amino group, a phenyl group, and a benzyl group are preferred.

Of the adducts of the triazine compound represented by the general formula (7) with cyanuric acid or isocyanuric acid, particularly preferred examples include melamine and melamine.
Mono (hydroxymethyl) melamine, di (hydroxymethyl) melamine, tri (hydroxymethyl) melamine,
Benzoguanamine, acetoguanamine, 2-amide-
Salts of 4,6-diamino-1,3,5-triazine are mentioned, and salts of melamine, benzoguanamine and acetoguanamine are particularly preferred.

The salt of the compound represented by the general formula (7) with cyanuric acid or isocyanuric acid can be prepared by converting a mixture of the compound represented by the general formula (7) with cyanuric acid or isocyanuric acid into a water slurry. This powder is obtained by mixing and forming both salts into fine particles, and then filtering and drying this slurry, which is different from a mere mixture. The salt does not need to be completely pure, but may be a somewhat unreacted compound of the formula (7) or cyanuric acid,
Isocyanuric acid may remain. The form of the salt is not particularly limited, but it is preferable to use a powder obtained as fine powder as possible from the viewpoint of mechanical strength and surface properties of a molded product obtained from the composition of the present invention. Particularly, those having an average particle diameter of 100 μm before blending with the resin are particularly preferable. When the dispersibility of the salt is poor,
A dispersant such as tris (β-hydroxyethyl) isocyanurate may be used in combination.

The halogen-based flame retardant is not particularly limited as long as it is a compound containing a halogen atom, and a generally known flame retardant can be used. Among them, brominated flame retardants can be more preferably used. For example, hexabromobenzene, pentabromotoluene, hexabromobiphenyl, decabromobiphenyl, hexabromocyclodecane, decabromodiphenyl ether, octabromodiphenyl ether, hexabromodiphenyl ether, bis (pentabromophenoxy) ) Monomeric organic bromine compounds such as ethane, ethylene-bis (tetrabromophthalimide) and tetrabromobisphenol A, and brominated polycarbonate (for example, a polycarbonate oligomer produced from brominated bisphenol A or a copolymer thereof with bisphenol A) ), Brominated epoxy compounds (for example, diepoxy compounds produced by the reaction of brominated bisphenol A with epichlorohydrin and brominated fluorinated compounds) Epoxy compounds obtained by the reaction of phenols with phenols and epichlorohydrin), poly (brominated benzyl acrylate), brominated polyphenylene ether, brominated bisphenol A, condensate of cyanuric chloride and brominated phenol, brominated (polystyrene), poly (Brominated styrene), brominated polystyrene such as cross-linked brominated polystyrene, and halogenated polymer bromine compounds such as cross-linked or non-cross-linked brominated poly α-methyl styrene. Among them, ethylene bis (tetrabromophthalimide) , Brominated epoxy polymers, brominated polystyrene, cross-linked brominated polystyrene, brominated polyphenylene ether and brominated polycarbonate are preferred, brominated polystyrene, cross-linked brominated polystyrene, brominated polyphenylene ether and Brominated polycarbonate is most preferably used.

The amount of the flame retardant (C) is usually 1 to 50 parts by weight, preferably 3 to 40 parts by weight, more preferably 5 to 30 parts by weight, based on 100 parts by weight of the thermoplastic resin. If the amount of the flame retardant is less than 1 part by weight, the effect of improving the flame retardancy is not recognized, and if it exceeds 50 parts by weight, the mechanical properties and surface appearance of the molded article are undesirably impaired.

Further, the flame-retardant resin composition of the present invention may contain, if necessary, a flame-retardant auxiliary such as a fluororesin, glass fiber, carbon fiber, metal fiber, aramid fiber, asbestos, potassium titanate whisker, and wallacetenite. , Glass flakes, glass beads, talc, mica, clay, calcium carbonate, barium sulfate, titanium oxide, aluminum oxide, and other fillers.

Further, as long as the object of the present invention is not impaired, an antioxidant such as a hindered phenol-based, phosphorus-based or sulfur-based antioxidant, a heat stabilizer, an ultraviolet ray, etc. may be added to the flame-retardant resin composition of the present invention. Absorbents (eg, resorcinol, salicylate, benzotriazole, benzophenone, etc.), lubricants and release agents (eg, montanic acid and its salts, esters, half-esters, stearyl alcohol, stellaramide and ethylene wax), anti-colorants (eg, One or more ordinary additives such as phosphates, hypophosphites, nucleating agents, plasticizers, flame retardants, antistatic agents, and coloring agents including dyes and pigments (cadmium sulfide, phthalocyanine, etc.) Can be added.

The flame-retardant resin composition of the present invention is produced by a generally known method. For example, (A) a thermoplastic resin,
(B) A radical generator, (C) a flame retardant and other necessary additives are premixed or supplied to an extruder or the like with or without premixing, and sufficiently melt-kneaded in a temperature range of 150 ° C to 350 ° C. It is prepared by In this case, for example, "
Single screw extruder with “Unimelt” type screw,
A twin-screw, a triple-screw extruder and a kneader-type kneader can be used. In particular, since the aspect ratio is controlled, it is preferable to use a kneading element by inserting several kneading elements or not inserting them into a screw. . The thermoplastic resin composition of the present invention is not only flame-retardant, but also excellent in mechanical properties, heat resistance, and moldability, and can be melt-molded, so that extrusion molding, injection molding, press molding, and the like are possible. It can be formed into films, tubes, rods and molded products having any desired shape and size. Furthermore, by utilizing the flame retardancy, it can be used for various applications such as housings for electric / electronic parts, automobile parts, mechanical mechanism parts, OA equipment, home electric appliances and the like and parts thereof.

For example, various gears, various cases, sensors, LEP lamps, connectors, sockets, resistors, relay case switch coil bobbins, capacitors, variable condenser cases, optical pickups, oscillators, various terminal boards, transformers, plugs, printed wiring Electric / electronics represented by boards, tuners, speakers, microphones, headphones, small motors, magnetic head bases, power modules, housings, semiconductors, liquid crystals, FDD carriages, FDD chassis, motor brush holders, parabolic antennas, computer-related parts, etc. Parts; VTR
Parts, TV parts, irons, hair dryers, rice cooker parts, microwave parts, audio parts, audio equipment parts such as audio / laser discs / compact discs, lighting parts, refrigerator parts, air conditioner parts, typewriter parts, word processor parts, etc. Home and office electrical product parts, office computer related parts, telephone related parts, facsimile related parts, copier related parts, cleaning jigs, various bearings such as oilless bearings, stern bearings, underwater bearings, and motor parts. , Lighter, typewriter, etc., machinery-related parts, microscopes, binoculars, cameras, watches, etc., optical equipment, precision machinery-related parts; alternator terminal, alternator connector, IC regulator, potentiometer Scan, various valves such as exhaust gas valve, fuel related-exhaust system, an intake system various pipes, air intake nozzle snorkel, intake manifold,
Fuel pump, engine cooling water joint, carburetor main body, carburetor spacer, exhaust gas sensor, cooling water sensor, oil temperature sensor, brake pad wear sensor, throttle position sensor,
Crankshaft position sensor, air flow meter, brake butt wear sensor, thermostat base for air conditioner, heating hot air flow control valve, brush holder for radiator motor, water pump impeller, turbine vane, wiper motor related parts, dust distributor, starter Switch, starter relay, transmission wire harness, window washer nozzle, air conditioner panel switch board, fuel related electromagnetic valve coil, fuse connector, horn terminal, electrical component insulation board,
Step motor rotor, lamp socket, lamp reflector, lamp housing, brake piston, solenoid bobbin, engine oil filter, ignition device case, personal computer, printer, display, CRT
Display, fax, copy, word processor, notebook computer, mobile phone, PHS, DVD drive, PD drive, floppy disk drive, etc., storage and housing, chassis, relay, switch, case member, transformer member, coil and bobbin etc. It is useful for equipment parts, automobile parts, machine parts, and other various uses.

[0078]

EXAMPLES The present invention will be described more specifically with reference to examples and comparative examples. In the examples, the number of parts indicates parts by weight, and% indicates% by weight except for the part relating to the composition of the radical generator (B). The unit "" means inches (1 inch = 2.54 cm).

Reference Example 1 <A-1> Preparation of Graft Copolymer The method for preparing the graft copolymer is described below. The graft ratio was determined by the following method. Acetone was added to a predetermined amount (m) of the graft copolymer and refluxed for 4 hours. The solution was centrifuged at 8000 rpm (centrifugal force 10,000 G (about 10
0 × 10 ³ m / s ² )) After centrifugation for 30 minutes, insoluble matter was filtered. This insoluble matter was dried under reduced pressure at 70 ° C. for 5 hours, and the weight (n) was measured.

Graft ratio = [(n)-(m) × L] /
[(M) × L] × 100 Here, L means the rubber content of the graft copolymer.

60 parts of polybutadiene latex (average rubber particle diameter 0.3 μm, gel content 85%) (in terms of solid content)
And 40 parts of a monomer mixture composed of 70% of styrene and 30% of acrylonitrile were added thereto to carry out emulsion polymerization. The obtained graft copolymer was coagulated with sulfuric acid, neutralized with caustic soda, washed, filtered and dried to prepare a powdery graft copolymer <A-1>.

The obtained graft copolymer <A-1> had a graft ratio of 36%. This graft copolymer <A
-1> is a non-grafting copolymer composed of 70% of styrene structural units and 30% of acrylonitrile 18.1
%. The intrinsic viscosity of the N, N-dimethylformamide-soluble component was 0.48 dl / g.

REFERENCE EXAMPLE 2 <A-2> Preparation of vinyl copolymer A vinyl copolymer <A-2> was prepared by subjecting a monomer mixture composed of 70% styrene and 30% acrylonitrile to suspension polymerization. . The obtained vinyl copolymer <A-2> is N,
The intrinsic viscosity of the N-dimethylformamide-soluble component is 0.73
Met.

Reference Example 3 <A-3> Polycarbonate "Iupilon S30"
00 ”(Mitsubishi Engineer Plastics Co., Ltd.)
0% by weight and 50% by weight of ABS "Toyolac T-100" (manufactured by Toray Industries, Inc.) are vented to 30 mmφ2.
Using a screw extruder, kneading and extrusion were performed at a melting temperature of 280 ° C., and pelletized polycarbonate / ABS (50 /
50) An alloy was manufactured.

<A-4> Polybutylene terephthalate “Toray PBT1100S” (manufactured by Toray Industries, Inc.) was used.

<A-5> Polyamide 6 "Amilan CM1010" (manufactured by Toray Industries, Inc.) was used.

Reference Example 4 (B) Radical generator <B-1> In a 1 L autoclave, 240 g of cumene (2 m
ol), and the mixture was adjusted to 215 ° C., and a mixture of 48 g (0.4 mol) of cumene and 30 g (0.2 mol) of cumene hydroperoxide was added dropwise with stirring over 4 hours. After stirring at 215 ° C. for another 1 hour and cooling, the product was taken out and purified by distillation under reduced pressure to obtain 160 g of the product. 1H-NM of the obtained product <B-1>
R was measured, and the components were identified and quantified as follows from the integrated intensities of the methyl proton, methylene proton, and vinyl proton.

2,3-dimethyl-2,3-diphenylbutane: 89.8% Compound of the following general formula (8): 9.2% Compound of the above general formula (9): 1.0%

Embedded image

<B-2>"NofmerB" which is 2,3-dimethyl-2,3-diphenylbutane having a purity of 98.9%
A mixture of 100 g of C ″ (manufactured by NOF Corporation) and 10 g of α-methylstyrene was charged into an eggplant-shaped flask and heated at 150 ° C. for 1 hour. Thereafter, the obtained product <B-2>
1H-NMR was measured, and the components were identified and quantified as follows from the integrated intensities of methyl protons and methylene protons.

2,3-dimethyl-2,3-diphenylbutane: 87.5% A mixture of the following general formulas (10) and (11): 12.5%

Embedded image

<B-3>"NofmerB" which is 2,3-dimethyl-2,3-diphenylbutane having a purity of 98.9%
C "(manufactured by NOF Corporation) was used.

Reference Example 5 (C) Flame retardant <C-1> Aromatic phosphate PX-200 (manufactured by Daihachi Chemical Co., Ltd.) was used.

<C-2> Melamine cyanurate MC44
0 (manufactured by Nissan Chemical Industries, Ltd.) was used.

<C-3> Brominated polycarbonate (Br)
-PC) "Fireguard 7500" (manufactured by Teijin Chemicals Ltd.) was used.

Examples 1 to 14, Comparative Examples 1 to 23 The thermoplastic resin (A), the radical generator (B), and the flame retardant (C) prepared in the reference examples were mixed in the mixing ratios shown in Tables 1 to 3. Then, using a vented 30 mmφ twin screw extruder, the mixture was kneaded at a melting temperature of 220 to 280 ° C. and extruded to produce a pellet-shaped polymer. Next, the test piece was molded by an injection molding machine, and the physical properties were measured under the following conditions.

(1) Flame retardancy: Flame retardancy of a test piece for flame retardancy evaluation obtained by injection molding was evaluated in accordance with the evaluation criteria defined in UL94. Flame retardancy level is V-0> V
-1>V-2> HB.

(2) Mechanical properties: Tensile yield strength of a dumbbell specimen obtained by injection molding was measured in accordance with ASTM D-638.

(3) 1/2 "Izod impact strength: AS
Impact resistance was evaluated according to TM D256-56A.

(4) Deflection temperature under load: ASTM D6
The heat resistance was evaluated according to 48 (load: 1.82 MPa).

(5) Fluidity: Using a melt indexer (manufactured by Toyo Seiki Co., Ltd.), the outflow MI value (g / 10 minutes) for 10 minutes under the temperature and load conditions shown in Tables 1 to 5 was measured. . The larger the MI value, the better the fluidity.

The results of measurement of the flame retardancy, mechanical properties, impact resistance, heat resistance, and fluidity of each sample are summarized in Tables 1 to 5.

[0102]

[Table 1]

From the comparison of Examples 1 to 5 and Comparative Examples 1 to 8,
It can be seen that adding a small amount of a radical generator to the ABS resin improves flame retardancy without impairing mechanical properties, impact resistance and heat resistance. Further, by using a flame retardant in combination, more excellent flame retardancy is exhibited. Furthermore, when a radical generator having high purity was used by using the radical generator containing the specific component of the present invention (Comparative Example 6)
8) that the combustion time is shortened and the fluidity is improved.

[0104]

[Table 2]

[0105]

[Table 3]

From the comparison between Examples 6 to 8 and Comparative Examples 9 to 13, and from the comparison between Examples 9 to 10 and Comparative Examples 14 to 17, the same applies to the case where AS resin and PC / ABS are used as the thermoplastic resin. By adding a small amount of the radical generator containing the specific component of the present invention, excellent flame retardancy and fluidity can be imparted without impairing the mechanical properties.

[0107]

[Table 4]

[0108]

[Table 5]

Examples 11 to 13 and Comparative Example 18
-22, and Examples 14-15 and Comparative Example 23
From the comparison of Nos. 25 to 25, even when PBT or nylon 6 was used as the thermoplastic resin, by adding a radical generator containing the specific component of the present invention, excellent flame retardancy was obtained without impairing the mechanical properties. It can be seen that fluidity can be provided.

[0110]

The resin composition of the present invention shows excellent flame retardancy and fluidity without impairing the mechanical properties of the thermoplastic resin.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 51/04 C08L 51/04 67/00 67/00 77/00 77/00

Claims (15)

[Claims] 1. A composition comprising (B) 5 to 20 mol% of one or more compounds selected from the following formulas (1) to (4) per 100 parts by weight of a thermoplastic resin. A radical generator represented by the following general formula (5) 0.01 to 0.01
A flame-retardant resin composition containing 5 parts by weight. Embedded image (X is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group, a carboxyl group, a hydroxyl group, an amino group,
It represents a nitrile group, a nitro group, or an epoxy group. Y and Z represent the same or different hydrogen atoms or a cumenyl group substituted with X. Further, n is an integer of 1 to 5, and m is an integer of 1 or more. ) (X is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group, a carboxyl group, a hydroxyl group, an amino group,
It represents a nitrile group, a nitro group, or an epoxy group. N is an integer of 1 to 5. ) 2. The flame-retardant resin composition according to claim 1, wherein the radical generator (B) is contained in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the thermoplastic resin (A). 3. The flame-retardant resin composition according to claim 1, further comprising (C) 1 to 50 parts by weight of a flame retardant per 100 parts by weight of the thermoplastic resin (A). 4. The flame-retardant resin composition according to claim 3, wherein the flame retardant (C) is a phosphorus-based flame retardant. 5. The flame-retardant resin composition according to claim 4, wherein the phosphorus-based flame retardant is an aromatic phosphate represented by the following general formula (6). Embedded image (In the formula, R ¹ to R ⁸ represent identical or different hydrogen atom or an alkyl group having 1 to 5 carbon atoms. The Ar ^1,
Ar ² , Ar ³ and Ar ⁴ represent the same or different phenyl groups or phenyl groups substituted with halogen-free organic residues. Y is a direct bond, O, S, S
O ₂ , C (CH ₃ ) ₂ , CH ₂ , and CHPh, and Ph represents a phenyl group. N is an integer of 0 or more. K and m are each an integer of 0 or more and 2 or less, and k +
m is an integer of 0 or more and 2 or less. ) 6. The flame-retardant resin composition according to claim 3, wherein the flame retardant (C) is a nitrogen-based flame retardant. 7. The flame-retardant resin composition according to claim 6, wherein the nitrogen-based flame retardant is a triazine-based flame retardant. 8. The flame-retardant resin composition according to claim 3, wherein the flame retardant (C) is a halogen-based flame retardant. 9. The flame-retardant resin composition according to claim 8, wherein the halogen-based flame retardant is a brominated flame retardant. 10. The flame-retardant resin composition according to claim 1, wherein (A) the thermoplastic resin is a polystyrene resin. 11. The flame-retardant resin composition according to claim 1, wherein the thermoplastic resin (A) is a polyester. 12. The flame-retardant resin composition according to claim 1, wherein (A) the thermoplastic resin is polybutylene terephthalate. 13. The flame-retardant resin composition according to claim 1, wherein the thermoplastic resin (A) is a polyamide. 14. A molded article comprising the flame-retardant resin composition according to claim 1. 15. The molded article according to claim 14, which is a housing of an electric / electronic part, an automobile part, a mechanical mechanism part, an OA device or a home electric appliance, and a part thereof.