JP3209978B2 - Thermoplastic resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a thermoplastic resin composition having excellent flame retardancy.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for flame retardancy of resin materials. For example, in the case of housing materials for OA equipment such as computers and printers, and home electric appliances such as televisions and audio equipment, there is a strong demand for flame retardancy to reduce fire damage. Further, as the weight and thickness of the device become thinner and the shape becomes more complicated, higher flame retardancy is required for the resin material. In addition, it is important that the resin does not drip (drip) particularly during combustion, in order to prevent the spread of fire in a fire.

[0003] As a method for improving the drip prevention of a thermoplastic resin composition, addition of polytetrafluoroethylene is generally well known.

[0004] However, although the flame retardancy of the thermoplastic resin is improved by the addition of polytetrafluoroethylene, the price of polytetrafluoroethylene is much higher than that of the thermoplastic resin. Even so, the price of the thermoplastic resin composition is greatly increased. In addition, polytetrafluoroethylene has poor compatibility with most thermoplastic resins, and thus easily forms aggregates in the resin composition. Agglomerates of polytetrafluoroethylene have problems that they impair the appearance of the molded product, increase the amount of addition required for the expression of flame retardancy, increase the price, and easily impair mechanical properties such as impact strength.

[0005] As described above, there is a strong demand for a technique for uniformly dispersing polytetrafluoroethylene in a thermoplastic resin and improving the flame retardancy by adding at least the added amount.

Accordingly, an attempt to improve the flame retardancy of a thermoplastic resin composition by adding a mixture of polytetrafluoroethylene and an organic polymer has been made in Japanese Patent Application Laid-Open No. 60-25826.
No. 3, JP-A-9-95583, JP-A-10-9583
No. 310707.

Japanese Unexamined Patent Publication (Kokai) No. 60-258263 discloses that flame retardancy is improved by adding a powder obtained by mixing and coagulating a polytetrafluoroethylene dispersion and an aromatic vinyl polymer dispersion. It is stated to improve. JP-A-9-95
No. 583 describes that a powder obtained by polymerizing an organic monomer in the presence of a polytetrafluoroethylene dispersion has excellent handleability. JP-A-10-310707 discloses that a thermoplastic resin composition comprising a polycarbonate, an acrylonitrile-styrene-butadiene copolymer and a polyorganosiloxane-containing composite rubber-based graft copolymer has excellent flame retardancy and impact resistance. It is described.

However, even with these methods,
At present, the addition amount of polytetrafluoroethylene required for making the thermoplastic resin flame-retardant is still large.

[0009]

An object of the present invention is to provide a thermoplastic resin composition having excellent flame retardancy.

[0010]

As a result of intensive studies by the present inventors, when a mixture of polytetrafluoroethylene and an organic polymer is added to a thermoplastic resin, the flame retardancy depends on the type of flame retardant used in combination. And found that a difference occurs in the present invention, and reached the present invention.

The gist of the present invention is that one or more thermoplastic resins (A) selected from polycarbonate, polyphenylene ether, polyolefin, aromatic vinyl polymer, polyester and polyamide, a flame retardant (B) and and polytetrafluoroethylene particles and organic polymers
Ranaru polytetrafluoroethylene-containing powder mixture (C)
The flame retardant (B) is a thermoplastic resin composition comprising
A thermoplastic resin composition characterized by being red phosphorus .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic resin (A) according to the present invention
Preferred are polycarbonate, polyphenylene ether, polyolefin, aromatic vinyl polymer, polyester, and polyamide.

The polycarbonate according to the present invention has the general formula

Embedded image And a bifunctional phenol (HO-Ar-OH)
Are linked by a carbonate bond.

Examples of difunctional phenols include hydroquinone, 4,4'-dihydroxydiphenyl, 1,1
-Bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane [abbreviated as bisphenol A], 1,1-bis (4-hydroxyphenyl) butane, bis (4-hydroxyphenyl) Examples thereof include sulfone and 4,4′-dihydroxydiphenyl ether, and one or more of these can be used.

In consideration of the mechanical properties and cost of the thermoplastic resin obtained, bisphenol A is preferred.

The polyphenylene ether according to the present invention has the general formula

Embedded image And a polymer obtained by oxidative polymerization of a phenol compound (Ar-OH).

Examples of the phenol compound include phenol, o-cresol, m-cresol, p-cresol, 2,6-dimethylphenol, 2,5-dimethylphenol, 2,4-dimethylphenol and 3,5-dimethylphenol. Phenol, 2-methyl-6-phenylphenol, 2,6-diphenylphenol, 2,6-diethylphenol, 2-methyl-6-ethylphenol, 2,
Examples thereof include 3,5-trimethylphenol, 2,3,6-trimethylphenol, and 2,4,6-trimethylphenol, and one or more of these can be used.

As the copolymerization component, bisphenol A,
Examples thereof include bifunctional phenol compounds such as tetrabromobisphenol A, resorcin, and hydroquinone.

The polyolefin according to the present invention is a vinyl polymer containing an α-olefin as a main component.

Α-olefin is α-olefin having 2 to 10 carbon atoms.
Olefin, for example, ethylene, propylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, 3,3-dimethylpentene-1, 3-methylhexene -1,4-methylhexene-1,4,4-dimethylhexene-1,5
-Methylhexene-1, allylcyclopentane, allylcyclohexane, allylbenzene, 3-cyclohexylbutene-1, vinylcyclopropane, vinylcyclohexane, 2-vinylbicyclo [2.2.1] heptane, heptene-1, octene-1 And the like, and one or more of these can be used. In view of the mechanical properties and cost of the obtained thermoplastic resin composition, ethylene or propylene is preferred.

As the copolymerization component, 4-methyl-1,4
-Hexadiene, 5-methyl-1,4-hexadiene,
Non-conjugated dienes such as 7-methyl 1,6-octadiene and 1,9-decadiene, vinyl acetate, acrylic acid, methacrylic acid, alkyl (meth) acrylate, aromatic vinyl,
Vinyl monomers such as maleic anhydride;
One or two or more kinds can be used so as to be 50% by weight or less of the whole polymerization component.

A functional group can be introduced into the polyolefin as needed. As an example of the introduction method, a polyolefin and an α, β-unsaturated carboxylic acid such as maleic anhydride and the like, an anhydride thereof, and an organic peroxide are heated and melted by an extruder or the like and kneaded to form a carboxylic acid group and There is a method for obtaining a polyolefin containing the anhydride group.

The aromatic vinyl polymer according to the present invention is a polymer obtained by polymerizing a monomer containing an aromatic vinyl monomer as a component. Examples of the aromatic vinyl monomer include styrene, α-methylstyrene, and p-methylstyrene. Examples of the aromatic vinyl polymer include various types of rubbery polymers such as aromatic vinyl homopolymer, butadiene rubber, styrene-butadiene copolymer, ethylene-propylene copolymer, and ethylene-propylene-diene copolymer. Containing aromatic vinyl polymer,
Styrene-maleic anhydride copolymer, styrene-methyl methacrylate copolymer, styrene-acrylonitrile copolymer, styrene-acrylonitrile-butadiene copolymer, styrene-acrylonitrile-acrylate copolymer and the like can be mentioned. .

The polyester according to the present invention is a polycondensate comprising a dicarboxylic acid and a diol.

Examples of dicarboxylic acids include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid,
Aromatic dicarboxylic acids such as diphenyldicarboxylic acid and diphenoxyethanedicarboxylic; adipic acid, sebacic acid,
Aliphatic dicarboxylic acids such as azelaic acid and decanedicarboxylic acid; alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid; and the like, and one or more kinds can be used. Considering the mechanical properties and cost of the thermoplastic resin composition obtained, terephthalic acid and isophthalic acid are preferred.

As the diol, ethylene glycol,
Aliphatic glycols such as diethylene glycol, trimethylene glycol, tetramethylene glycol, neopentyl glycol, hexamethylene glycol, dodecamethylene glycol, triethylene glycol, tetraethylene glycol and polyethylene glycol; alicyclic glycols such as cyclohexanedimethanol; bisphenols , Hydroquinone, aromatic diols such as 2,2-bis (4-β-hydroxyethoxyphenyl) propane and the like, and one or more of these can be used. In consideration of the mechanical properties and cost of the obtained thermoplastic resin composition, ethylene glycol, diethylene glycol, 1,4-cyclohexanedimethanol, and 2,2-bis (4-β-hydroxyethoxyphenyl) propane are preferred.

The polyamide according to the present invention is a polycondensate composed of a diamine and a dicarboxylic acid, a polycondensate of an amino acid, and a ring-opening polymer of a lactam.

Examples of dicarboxylic acids include adipic acid,
Dicarboxylic acids having 4 to 12 carbon atoms such as pimelic acid, suberic acid, sebacic acid and dodecane diacid; and derivatives capable of producing carboxylic acids such as esters and acid chlorides thereof. Alternatively, two or more kinds can be used.

Examples of the diamine include organic diamines having 2 to 13 carbon atoms such as hexamethylenediamine and octamethylenediamine; and derivatives capable of forming amines such as amine salts thereof. Alternatively, two or more kinds can be used.

Examples of polycondensates composed of diamine and dicarboxylic acid include polyhexamethylene adipamide composed of hexamethylenediamine and adipic acid [6,6
Nylon], polyhexamethylene azamide [6,9 nylon] composed of hexamethylene diamine and azelaic acid, polyhexamethylene sebacamide [6,10 nylon] composed of hexamethylene diamine and sebacic acid, hexamethylene diamine and dodecanedione Polyhexamethylene dodecanoamide [6,12
Nylon], poly-bis (4-aminocyclohexyl) methane dodecane composed of bis-p-aminocyclohexylmethane and dodecandionic acid.

Examples of polycondensates of amino acids include, for example, polyundecaneamide [11 nylon] composed of ω-aminoundecanoic acid.

Examples of ring-opening polymers of lactams include ε-
Examples thereof include polycapramide [6 nylon] composed of aminocaprolactam and polylauric lactam [12 nylon] composed of ε-aminolaurolactam.

Considering the mechanical properties and cost of the obtained thermoplastic resin composition, polyhexamethylene adipamide [6,6 nylon], polyhexamethylene azamide [6,9 nylon], polycaprolamide [6 Nylon] is preferred.

As the thermoplastic resin (A) according to the present invention, one kind or two or more kinds can be used.

As the thermoplastic resin (A) according to the present invention, other thermoplastic resins such as vinyl chloride, PMMA, various elastomers and polyoxymethylene can be used in an amount of 50% by weight or less of the whole (A). .

Red phosphorus is used as the flame retardant (B) according to the present invention.
You.

[0037]

[0038]

[0039]

[0040]

The polytetrafluoroethylene-containing mixed powder (C) according to the present invention comprises polytetrafluoroethylene particles having a particle diameter of 10 μm or less and an organic polymer, and polytetrafluoroethylene has a particle diameter of 10 μm.
It is necessary that it does not form an aggregate. Furthermore, from the viewpoint of dispersibility when blended in a thermoplastic resin, in a dispersion obtained by mixing an aqueous dispersion of polytetrafluoroethylene particles and an aqueous dispersion of organic polymer particles having a particle diameter of 0.05 to 1.0 μm. It is necessary to use a product obtained by polymerizing a vinyl monomer and pulverizing by coagulation or spray drying. The aqueous dispersion of polytetrafluoroethylene particles having a particle diameter of 0.05 to 1.0 μm used for obtaining the polytetrafluoroethylene-containing mixed powder (C) according to the present invention is obtained by emulsion polymerization using a fluorinated surfactant. Obtained by polymerizing a tetrafluoroethylene monomer.

In the emulsion polymerization of polytetrafluoroethylene particles, copolymer components such as hexafluoropropylene, chlorotrifluoroethylene, fluoroalkylethylene, and perfluoroalkylvinyl ether are contained as long as the properties of polytetrafluoroethylene are not impaired. Fluorinated olefins and fluorinated alkyl (meth) acrylates such as perfluoroalkyl (meth) acrylate can be used. The content of the copolymer component is preferably 10% by weight or less based on tetrafluoroethylene.

Commercially available raw materials for the polytetrafluoroethylene particle dispersion include Fluon AD-1 and AD-936 manufactured by Asahi Glass Fluoropolymer Co., Ltd., and Polyflon D-1 and D-2 manufactured by Daikin Industries, Ltd., and Mitsui DuPont Fluorochemical Co., Ltd. Teflon 30J manufactured by the company can be cited as a representative example.

The aqueous dispersion of organic polymer particles used for obtaining the polytetrafluoroethylene-containing mixed powder (C) according to the present invention is obtained by polymerizing a vinyl monomer by a known method such as emulsion polymerization. Obtainable.

A vinyl monomer used for obtaining an aqueous dispersion of organic polymer particles, and a particle size of 0.05 to 1.0 μm
The vinyl monomer to be polymerized in the dispersion obtained by mixing the aqueous dispersion of polytetrafluoroethylene particles and the aqueous dispersion of organic polymer particles is not particularly limited. Plastic resin (A)
From the viewpoint of dispersibility at the time of blending with the thermoplastic resin, it is preferable that the resin has a high affinity for the thermoplastic resin (A).

Specific examples of these vinyl monomers include styrene, α-methylstyrene, p-methylstyrene, o
-Methylstyrene, t-butylstyrene, o-ethylstyrene, p-chlorostyrene, o-chlorostyrene,
2,4-dichlorostyrene, p-methoxystyrene, o
Aromatic vinyl monomers such as -methoxystyrene and 2,4-dimethylstyrene; methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, (Meth) such as 2-ethylhexyl methacrylate, dodecyl acrylate, dodecyl methacrylate, tridecyl acrylate, tridecyl methacrylate, octadecyl acrylate, octadecyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, etc.
Acrylic ester monomers; vinyl cyanide monomers such as acrylonitrile and methacrylonitrile; α, β-unsaturated carboxylic acids such as maleic anhydride; N-phenylmaleimide, N-methylmaleimide, N-cyclohexylmaleimide Maleimide monomers such as glycidyl methacrylate; vinyl ether monomers such as vinyl methyl ether and vinyl ethyl ether;
Vinyl carboxylate monomers such as vinyl acetate and vinyl butyrate;
Α-olefin monomers such as ethylene, propylene and isobutylene; and diene monomers such as butadiene, isoprene and dimethylbutadiene. These monomers can be used alone or in combination of two or more.

Among these monomers, thermoplastic resin (A)
As a preferable thing from the viewpoint of affinity with, a monomer containing at least 30% by weight of at least one monomer selected from the group consisting of an aromatic vinyl monomer and a vinyl cyanide monomer. Can be mentioned. Particularly preferred are monomers containing at least 30% by weight of one or more monomers selected from the group consisting of styrene and acrylonitrile.

The content of polytetrafluoroethylene in the polytetrafluoroethylene-containing mixed powder used in the present invention is preferably 0.1% by weight to 90% by weight. If it is less than 0.1% by weight, the effect of improving the flame retardancy becomes insufficient, and if it exceeds 90% by weight, the surface appearance may be adversely affected.

The polytetrafluoroethylene-containing mixed powder (C) used in the present invention was subjected to salting-out and coagulation by putting the aqueous dispersion thereof into hot water in which metal salts such as calcium chloride and magnesium sulfate were dissolved. It can be dried later or powdered by spray drying.

Normal polytetrafluoroethylene fine powder becomes an aggregate having a size of 100 μm or more in the step of recovering as a powder from the state of a particle dispersion, so that it is difficult to uniformly disperse it in a thermoplastic resin. On the other hand, the polytetrafluoroethylene-containing mixed powder used in the present invention has extremely dispersibility in the thermoplastic resin (A) because polytetrafluoroethylene alone does not form a domain having a particle diameter of more than 10 μm. Are better. As a result, in the thermoplastic resin composition of the present invention, polytetrafluoroethylene is efficiently made into fine fibers in the thermoplastic resin, and has excellent flame retardancy and excellent surface properties.

The thermoplastic resin composition according to the present invention can be obtained by mixing a thermoplastic resin (A), a flame retardant (B), and a mixed powder containing polytetrafluoroethylene (C).

The mixing ratio is not particularly limited. However, considering the flame retardancy, mechanical properties and cost of the thermoplastic resin composition to be obtained, the mixing ratio is preferably based on 100 parts by weight of (A).
(B) 0.1 to 70 parts by weight, (C) 0.001 to 50 parts by weight, more preferably (B) 2 to 30 parts by weight,
(C) 0.01 to 10 parts by weight.

The masterbatch mixed with the thermoplastic resin (A) is prepared in advance by increasing the ratio of the polytetrafluoroethylene-containing mixed powder (C), and then the masterbatch is mixed with the thermoplastic resin (A). And the flame retardant (B) in a desired composition.

The method of mixing is not particularly limited, but may be a generally known method using a single-screw extruder, a twin-screw extruder, a batch kneader, a roll, or the like.

The thermoplastic resin composition according to the present invention may contain various additives such as fillers such as glass fiber, talc and mica, dyes, pigments, stabilizers and reinforcing agents.

The thermoplastic resin composition according to the present invention comprises OA
It can be used in fields where flame retardancy is required, such as housing materials for devices and home appliances.

Hereinafter, the present invention will be described with reference to examples. In Reference Examples, Examples and Comparative Examples, "parts" and "%" are "parts by weight" and "% by weight" unless otherwise specified.
Means

[0058]

EXAMPLES Various physical properties in Examples and Comparative Examples were measured by the following methods.

(1) Solids: The particle dispersion was heated at 170 ° C. for 3 hours.
It was obtained by drying for 0 minutes.

(2) Particle size distribution, weight average particle size: A particle dispersion diluted with water was used as a sample solution, and a dynamic light scattering method (ELS800, manufactured by Otsuka Electronics Co., Ltd., temperature: 25 ° C., scattering angle: 90) Degree).

(3) Zeta potential: 0.0
An electrophoresis method (ELS800, manufactured by Otsuka Electronics Co., Ltd.)
At a temperature of 25 ° C. and a scattering angle of 10 °).

(4) Combustion test: A combustion test was performed with a test piece thickness of 0.8 mm according to the UL94-V standard set by Underwriters Laboratories Corporation to make a judgment. A test piece was obtained by injection molding the obtained resin composition.

Reference Example 1 Production of polytetrafluoroethylene-containing mixed powder (C-1) 300 parts of distilled water and 2 parts of sodium dodecylbenzenesulfonate were placed in a flask equipped with a stirrer, a cooler, a thermocouple, a nitrogen inlet, and a reagent dropping device. It was charged and heated to 70 ° C. in a water bath under a nitrogen stream. After dissolving 0.0004 parts of ferrous sulfate, 0.0012 parts of disodium ethylenediaminetetraacetate, and 0.8 parts of sodium formaldehyde sulfoxylate in 5 parts of distilled water and adding to the contents, 30 parts of acrylonitrile and 70 parts of styrene were added. , A mixture of 0.5 parts of cumene hydroxyperoxide was added dropwise over 3 hours, and then the mixture was heated and stirred for 1 hour to obtain an acrylonitrile-styrene copolymer particle dispersion (P-1). The solid content of P-1 is 25.1%, the weight average particle diameter is 100 μm, and the surface potential is -3.
It was 0 mV.

As a polytetrafluoroethylene particle dispersion, Fluon AD936 manufactured by Asahi Glass Fluoropolymers Co., Ltd.
Was used. AD936 contains 5 parts of polyoxyethylene alkylphenyl ether per 100 parts of polytetrafluoroethylene, has a solid content of 63.0%, shows a single particle size distribution, a weight average particle size of 290 nm, and has a surface potential of 20 mV. To 833 parts of AD936, 1167 parts of distilled water was added to obtain a polytetrafluoroethylene particle dispersion (F-1) having a solid content of 26.2%.

239.0 parts of P-1 (acrylonitrile-styrene copolymer 60 parts) and 80 parts of F-1 (polytetrafluoroethylene 20 parts) were mixed with a stirrer, a condenser,
The flask was equipped with a thermocouple, a nitrogen inlet, and a reagent dropping device, and stirred at room temperature for 1 hour under a nitrogen stream. Thereafter, the mixture was heated to 80 ° C. in a water bath and stirred for 1 hour. Ferrous sulfate 0.00
04 parts, disodium ethylenediaminetetraacetate 0.00
12 parts and 0.8 parts of sodium formaldehyde sulfoxylate are dissolved in 5 parts of distilled water and added to the contents.
A mixture of 6 parts of acrylonitrile, 14 parts of styrene, and 0.1 part of cumene hydroxy peroxide was added dropwise over 30 minutes, and the mixture was heated and stirred for 1 hour. No solid matter was separated, and a uniform particle dispersion was obtained. The solid content of the particle dispersion was 28.6%, and the weight average particle size was 220 nm.

The particle dispersion was poured into an aqueous calcium chloride solution, the solid was separated, filtered and dried to obtain a polytetrafluoroethylene-containing mixed powder (C-1). The dried C-1 was molded using a press molding machine, an ultrathin section was collected from the molded product using a microtome, and observed with a transmission electron microscope without staining. Polytetrafluoroethylene was observed as a dark part, and no aggregate exceeding 10 μm was observed.

Reference Example 2 Production of polytetrafluoroethylene-containing mixed powder (C-2) 298.8 parts of acrylonitrile-styrene copolymer particle dispersion (P-1) used in Reference Example 1 (75 parts of acrylonitrile-styrene copolymer) And 100 parts of the polytetrafluoroethylene particle dispersion (F-1) used in Reference Example 1 (25 parts of polytetrafluoroethylene) were charged into a flask equipped with a stirrer, a cooler, and a thermocouple, and placed under a nitrogen stream. The mixture was stirred at room temperature for 1 hour, and then heated to 70 ° C. in a water bath and stirred for 1 hour. No solid matter was separated, and a uniform particle dispersion was obtained. The solid content of the particle dispersion was 24.9%, and the weight average particle size was 220 nm.

The particle dispersion was poured into an aqueous calcium chloride solution, the solid was separated, filtered and dried to obtain a polytetrafluoroethylene-containing mixed powder (C-2). When observation with a transmission electron microscope was performed in the same manner as in Reference Example 1, 10
No polytetrafluoroethylene aggregates larger than μm were observed.

Reference Example 3 Production of polytetrafluoroethylene-containing mixed powder (C-3) 160 parts of polytetrafluoroethylene particle dispersion (F-1) used in Reference Example 1 (polytetrafluoroethylene 4
0 parts), 1.0 part of dodecylbenzenesulfonic acid, and 70 parts of distilled water were charged into a flask equipped with a stirrer, a condenser, a thermocouple, a nitrogen inlet, and a reagent dropping device, and heated to 70 ° C. in a water bath under a nitrogen stream. Heated. After dissolving 0.0004 parts of ferrous sulfate, 0.0012 parts of disodium ethylenediaminetetraacetate, and 0.8 parts of sodium formaldehyde sulfoxylate in 5 parts of distilled water and adding to the contents, 18 parts of acrylonitrile and 42 parts of styrene were added. And a mixed solution of 0.3 parts of cumene hydroxyperoxide was added dropwise over 90 minutes, and then the mixture was heated and stirred for 1 hour. No solid matter was separated, and a uniform particle dispersion was obtained. The solid content of the particle dispersion is 33.2%,
The weight average particle size was 220 nm.

This particle dispersion was poured into an aqueous calcium chloride solution, the solid was separated, filtered and dried to obtain a polytetrafluoroethylene-containing mixed powder (C-3). When observation with a transmission electron microscope was performed in the same manner as in Reference Example 1, 10
No polytetrafluoroethylene aggregates larger than μm were observed.

Examples 1 to 5 and Comparative Examples 1 to 5 A thermoplastic resin, a flame retardant and C-1 to 3 obtained in Reference Examples 1 to 3 shown in Table 1 were mixed with a twin screw extruder (WERNER & PFLEI).
Barrel temperature of 240 using DESKER ZSK30)
The mixture was melt-kneaded at ℃. The obtained pellets were formed into UL94-V test pieces at a cylinder temperature of 240 ° C. using an injection molding machine (IS-100 manufactured by Toshiba Machine Co., Ltd.). Flame retardancy was evaluated using the obtained test pieces.

[0072]

[Table 1] The following is clear from the examples and the comparative examples.

(1) As shown in Comparative Example 1 and Examples 1 to 3, the thermoplastic resin composition obtained by the present invention has excellent flame retardancy.

(2) As in Comparative Examples 2 to 5, when bis (tribromophenoxyethane) and antimony trioxide were used as the flame retardant, the flame retardancy was maintained even when the mixed powder containing polytetrafluoroethylene was added. Does not change.

(3) After mixing the polytetrafluoroethylene dispersion and the organic polymer dispersion as in Example 1, the mixed powder (C-
1) Or when the mixed powder (C-3) obtained by polymerizing a vinyl monomer in the presence of a polytetrafluoroethylene dispersion liquid as in Example 2 is used, the thermoplastic resin composition has difficulty. Flammability is particularly high.

(4) As in Examples 4 and 5, when the acrylonitrile-styrene-butadiene copolymer and the polycarbonate were used as the thermoplastic resin,
The thermoplastic resin composition obtained according to the present invention has excellent flame retardancy.

[0077]

According to the present invention, in a thermoplastic resin composition requiring flame retardancy, the effect of improving the flame retardancy by the polytetrafluoroethylene-containing mixed powder can be further enhanced.

The present invention provides a thermoplastic resin composition having excellent flame retardancy, and its utility value in fields requiring flame retardancy such as housing materials of OA equipment and home electric appliances is extremely large. It is.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-11-92650 (JP, A) JP-A-11-12454 (JP, A) JP-A-6-9887 (JP, A) JP-A-11-92 199680 (JP, A) JP-A-11-209600 (JP, A) JP-A-11-209601 (JP, A) JP-A-11-302534 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08L 1/00-101/16 C08K 3/00-13/08

Claims (1)

(57) [Claims] 1. One or more thermoplastic resins (A) selected from polycarbonate, polyphenylene ether, polyolefin, aromatic vinyl polymer, polyester and polyamide, a flame retardant (B), and polytetraf
A thermoplastic resin composition comprising a polytetrafluoroethylene-containing mixed powder (C) comprising fluoroethylene particles and an organic polymer , wherein the flame retardant (B) is red phosphorus .