JPH1030045A - Production of flame-retardant thermoplastic resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain the subject composition having excellent physical properties and flame retardancy and simultaneously excellent in appearance and drip-preventing effect by using a perfluoropolymer having a specific form as a drip-preventing agent. SOLUTION: This flame-retardant thermoplastic resin composition comprises (A) 100 pts.wt. of a thermoplastic resin mixture comprising (i) a graft copolymer produced by graft-copolymerizing a mixture comprising (a) 60-100wt.% of an aromatic vinyl monomer and (b) 0-40wt.% of a monomer capable of being copolymerized with the component (a) in the presence of a rubbery polymer and/or (ii) the copolymer of 60-100wt.% of the component (a) with 0-40wt.% of the component (b) or a thermoplastic resin mixture comprising the component (i) and/or the component (ii) and (iii) either one of a polycarbonate, a polyphenylene ether and a saturated polyester, (B) 1-35 pts.wt. of a flame retardant comprising an organic halogenated compound and/or an organic phosphorus compound, and (C) 0.01-1 pt.wt. of a drip-preventing agent comprising a perfluoropolymer. Therein, the component C comprises spherical perfluoropolymer particles having a number-average mol.wt. of >=1×10<6> , a bulk density of >=0.6g/ml and an average particle diameter of 100-1000μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a flame-retardant thermoplastic resin composition capable of easily obtaining a resin molded product having excellent drip resistance and appearance.

[0002]

2. Description of the Related Art Styrene resins typified by ABS, HIPS, etc. are widely used in electrical appliances, office automation equipment, office equipment, etc. due to their excellent moldability, mechanical properties, appearance, and the like. . In these applications, it is often necessary to make the resin flame-retardant due to problems such as heat generation of the internal components, and organic halogen compounds and organic phosphorus compounds are added as flame retardants,
Techniques for making resins flame-retardant are widely used.

On the other hand, the flame retardancy standard (UL94) of the United States Underwriters Laboratories (UL), which is generally used as an index of the flame retardancy of a resin, has a rule on dripping of a fire during combustion. , V-0 class, 5V, which is the flame retardancy level normally required for the application
The class requires that it not drip during combustion.
In order to satisfy this requirement, a technique has recently been proposed in which a perfluoropolymer (PFP) powder such as polytetrafluoroethylene (PTFE) is added to a resin as an anti-drip agent in addition to the above-mentioned flame retardant. For example, JP-A-50-44241, JP-A-59-98158, JP-A-61-89241, and JP-A-63-89241
JP-135442 discloses that ABS includes a flame retardant and PTFE.
A technique for blending powder is disclosed.

[0004] However, PFP powder, which has been conventionally used as a drip inhibitor for thermoplastic resins, is produced by an emulsion polymerization method and has a disadvantage that the powder form is inferior due to its non-uniform particle shape. Also such PFP
The particles had a low bulk density and also had the disadvantage that the PFP particles were easily fused by a slight pressurization and heating. Prior to kneading using an extruder or the like in the production of the resin composition, there is a premixing step of mixing with other additives using a Henschel mixer or the like. When conventional PFP powder is added as an anti-drip agent for resin, due to the above-mentioned disadvantages, the particles are easily sheared in the mixer and the respective particles are easily fused, so that the PFP particles are easily changed into a spider web shape, There has been a problem in that it is entangled with other resins and additives to form additive lumps that are difficult to disperse. As a result, the raw material feed feeder of the extruder does not close or the additive mass does not disperse at the time of kneading in the extruder, and the unmixed additive mass is mixed into the obtained resin composition to obtain a molded product. There were problems such as poor appearance.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a specific form of P
It is an object of the present invention to provide a method for producing a flame-retardant thermoplastic resin composition, in which a resin molded article having excellent drip resistance and appearance can be obtained by using FP as an anti-drip agent. .

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have found that a specific form of PFP completely different from conventional PFP powder is used as an anti-drip agent. As a result, it has been found that entanglement with other additives at the time of premixing can be suppressed, and poor dispersion of PFP in the obtained resin composition can be eliminated, and the present invention has been completed.

That is, the gist of the present invention is to provide (A) a thermoplastic resin mixture 100 comprising the following (A1) and / or (A2) or comprising (A1) and / or (A2) and (A3). When (B) 1 to 35 parts by weight of a flame retardant comprising an organic halogen compound and / or an organic phosphorus compound and (C) 0.01 to 1 part by weight of an anti-drip agent comprising a perfluoropolymer, As an anti-drip agent, the number average molecular weight is 1 × 10 ⁶ or more, and the bulk density is 0.
A method for producing a flame-retardant thermoplastic resin composition characterized by using a perfluoropolymer (hereinafter abbreviated as PFP) which is a spherical particle having an average particle diameter of 100 to 1000 μm or more at 6 g / ml or more.

(A1) Aromatic vinyl monomer 60 to 100
% By weight and a monomer copolymerizable with the aromatic vinyl monomer 0
Graft copolymer obtained by graft copolymerizing a mixture of about 40% by weight in the presence of a rubbery polymer (A2) Copolymerizable with 60 to 100% by weight of an aromatic vinyl monomer and an aromatic vinyl monomer 0-40% by weight monomer
(A3) Polycarbonate, polyphenylene ether,
At least one selected from the group consisting of saturated polyesters
Seed polymer.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The (A) resin mixture used in the present invention is a thermoplastic resin mixture comprising (A1) a graft copolymer and / or (A2) copolymer, or further (A3) a polymer. The (A1) graft copolymer used in the present invention is a mixture of 60 to 100% by weight of an aromatic vinyl monomer and 0 to 40% by weight of a monomer copolymerizable with an aromatic vinyl monomer. A graft copolymer obtained by graft copolymerization in the presence of a rubbery polymer.

In order for the resin composition produced according to the present invention to have excellent physical properties, flame retardancy, and processability, it is necessary that (A1)
The weight average particle diameter of the rubbery polymer contained in the graft copolymer is 0.1 to 5 μm, more preferably 0.2 to 3 μm.
The rubber content is preferably 1 to 80% by weight, more preferably 5 to 70% by weight. When these values are less than the above ranges, the impact resistance of the finally obtained resin molded product is reduced, and when it exceeds the above range, the flame retardancy of the finally obtained resin molded product tends to be reduced.

(A1) The rubbery polymer used in the graft copolymer has a glass transition temperature of 0 ° C. or lower, preferably -20 ° C. or lower. For example, polybutadiene or a copolymer of butadiene and another copolymer Examples include a rubbery polymer composed of a copolymer with a monomer. (A1) Specific examples of the aromatic vinyl monomer which is a constituent component of the graft copolymer include styrene, α-alkylstyrene such as α-methylstyrene, nucleus-substituted alkylstyrene such as p-methylstyrene, and vinylnaphthalene. And the like. These may be one kind or a mixture of two or more kinds.

Specific examples of the monomer copolymerizable with the aromatic vinyl monomer include vinyl cyanide monomers such as acrylonitrile and methacrylonitrile, acrylic acid, methacrylic acid, and alkyl esters thereof. And unsaturated anhydride derivative-based monomers such as maleic anhydride and imidized products thereof. These are 1
It may be a species or a mixture of two or more species.

(A1) The ratio of the aromatic vinyl monomer component in the monomer mixture used for the graft copolymer is from 60 to 60%.
The range is 100% by weight. If less than 60% by weight,
The heat resistance, impact resistance, color tone, and the like of the resin molded product obtained from the resin composition to be produced are deteriorated. (A1) The graft copolymer can be prepared from the above-mentioned monomer or a mixture thereof by a known method, for example, an emulsion polymerization method, a suspension polymerization method, a solution polymerization method, a bulk polymerization method, or the like, in a batch system or a continuous system. It can be manufactured by the method.

(A1) Specific examples of the graft copolymer include impact-resistant polystyrene (HIPS resin), acrylonitrile / butadiene / styrene copolymer (ABS resin), and methyl methacrylate / butadiene / styrene copolymer (MBS resin). ), Methyl methacrylate / acrylonitrile / butadiene / styrene copolymer (MABS)
Resins), acrylonitrile / acrylic rubber / styrene copolymer (AAS resin), acrylonitrile / ethylene propylene rubber / styrene copolymer (AES resin), and resins such as acrylonitrile / chlorinated polyethylene / styrene copolymer (ACS resin) Or a mixture thereof.

The (A2) copolymer used in the present invention is composed of 60 to 100% by weight of an aromatic vinyl monomer and 0 to 40% by weight of a monomer copolymerizable with an aromatic vinyl monomer. It means a copolymer obtained by copolymerization. Specific examples of the aromatic vinyl monomer which is a constituent component of the (A2) copolymer include the same monomers as in the (A1) graft copolymer.

As specific examples of the monomer which can be copolymerized with the aromatic vinyl monomer, which is a component of the copolymer (A2), the same monomers as in the graft copolymer (A1) may be used. Can be mentioned. (A2) The ratio of the aromatic vinyl monomer component used in the copolymer is in the range of 60 to 100% by weight. If the content is less than 60% by weight, the heat resistance, impact resistance, color tone, etc. of the resin molded product obtained from the resin composition to be produced are reduced.

This (A2) copolymer can be prepared by a method such as emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization according to, for example, a known acrylonitrile-styrene copolymer production technique. , Can be manufactured in a batch mode or a continuous mode. The copolymer (A2) can be produced simultaneously in the same polymerization system in the polymerization operation of the graft copolymer (A1), or can be produced by separately setting a polymerization method and polymerization conditions.

The (A3) polymer used in the present invention is:
At least one polymer selected from the group consisting of polycarbonate, polyphenylene ether, and saturated polyester, optionally blended with the (A1) graft copolymer and / or (A2) copolymer as required. Is done.
Here, the polycarbonate is a homopolycarbonate or copolycarbonate based on an aromatic dihydroxy compound, and is particularly synthesized from bisphenol A and phosgene, and has a weight average molecular weight of 1700 to 30000.
The bisphenol A type polycarbonate is preferably used.

The polyphenylene ether is a polymer obtained by oxidative polymerization of phenols. In the present invention, poly (2,6-dimethyl-1,4-phenylene) which is a polymer of 2,6-xylenol is particularly preferred. ether)
Is preferably used. The saturated polyester is a polymer obtained by condensation polymerization of a dicarboxylic acid and a dihydroxy compound. In the present invention, polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) are particularly preferably used.

In the resin mixture (A) according to the present invention, (A1) a graft copolymer, (A2) a copolymer,
3) The polymer can be blended in any ratio,
(A) The resin mixture must contain (A1) the graft copolymer and / or (A2) copolymer as an essential component, and the amount thereof is based on the total amount of (A) the resin mixture. It is preferably at least 10% by weight. (A) The resin mixture is (A
When neither 1) the graft copolymer nor the (A2) copolymer is contained, the moldability and the like of the resin composition produced by the present invention are reduced.

In the case where the resin mixture (A) comprises only the (A1) graft copolymer and the (A2) copolymer, (A1)
If the blending amount of the graft copolymer is less than 10% by weight, the impact resistance of the obtained resin molded product is reduced. Even in such a case, the drip preventing effect and the dispersing effect of the (D) anti-drip agent described later. Is valid. In the present invention, any other resin can be further added as necessary. Examples of other resins that can be added include polyamide resins.

The flame retardant (B) used in the present invention is an organic halogen compound and / or an organic phosphorus compound, and a conventional flame retardant which can impart sufficient flame retardancy when added to a resin is used. However, as the organic halogen compound, a compound containing bromine and / or chlorine, and as the organic phosphorus compound, a phosphate compound and / or a phosphazene compound are used. preferable.

(B) When an organic halogen compound is used as the flame retardant, at least one compound selected from the group consisting of halogenated bisphenol compounds, halogenated epoxy compounds, and halogenated triazine compounds is used. (B) It is most preferable because the flame retardant of the flame retardant is high and the effect of the present invention is maximized. The halogenated bisphenol compound used in the present invention is a halide of bisphenol, for example, tetrabromobisphenol A, dibromobisphenol A, tetrachlorobisphenol A, dichlorobisphenol A, tetrabromobisphenol F, dibromobisphenol F, tetrabromobisphenol F Examples thereof include chlorobisphenol F, dichlorobisphenol F, tetrabromobisphenol S, dibromobisphenol S, tetrachlorobisphenol S, and dichlorobisphenol S. These may be one kind or a mixture of two or more kinds.

The halogenated epoxy compound used in the present invention is a reaction product of a halogenated bisphenol compound and epihalohydrin or halogenated bisphenol diglycidyl ether, and is represented by the following general formula.

[0025]

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(Wherein, n is an integer of 0 or 1 or more, X is an odor
An element atom or a chlorine atom, a, b, c, and d are integers of 1 to 4,
R₁Is isopropylidene, methylene or sulfone
Group, R _Two, R_ThreeIs a 2,3-epoxypropyl group
Or -CH_TwoCH (OH) CH _TwoOR_FourThe group [R_FourIs bromine
An alkyl group which may be substituted with an atom or chlorine atom, or
Represents an allyl group]. )

Specific examples of the halogenated bisphenol compound used as a raw material of the halogenated epoxy compound include those exemplified in the preceding paragraph. The polymerization degree n of the halogenated epoxy compound is 0 or an integer of 1 or more, more preferably an integer of 0 to 15, and two or more kinds having different polymerization degrees n may be used in combination.

The terminal of the halogenated epoxy compound may be an epoxy group, or the epoxy group may be blocked with an allyl group or an alkyl group. It may be substituted with a halogen atom such as chlorine or bromine. Specific examples of the terminal blocking group include phenyl group, unsubstituted allyl group such as naphthyl group, tribromophenyl group, pentabromophenyl group, trichlorophenyl group, halogenated allyl group such as pentachlorophenyl group, and alkyl such as stearyl group. And the like.

The terminal of the halogenated epoxy compound used in the present invention is not limited as long as it is within the above range, and the structure of one terminal and the other terminal may be the same or different. The halogenated triazine compound used in the present invention is an organic halogen compound having a triazine skeleton and is represented by the following general formula.

[0030]

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(Wherein Y is a —O— group or a —NH— group,
R ₄ represents a brominated or chlorinated allyl group and / or an alkyl group. Such a compound is generally obtained by reacting a compound having a triazine skeleton such as cyanuric acid or melamine with a compound having a hydroxyl group such as brominated or chlorinated phenols or alcohols or an amine compound.

(B) When an organophosphorus compound is used as a flame retardant, a case where a phosphate compound is used (B)
It is most preferable because the flame retardant has a high flame retarding ability and the effect of the present invention is maximized. The phosphate compound used in the present invention is an ester of phosphoric acid and a phenol, and is represented by the following general formula.

[0033]

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(Wherein, n is a number from 0 to 10, and R ₅ is an allyl group and / or an alkyl group which may be substituted with a halogen atom.) (B) It is necessary to use only one type of flame retardant. Not 2
At least one kind of different compounds may be used, or an organic halogen compound and an organic phosphorus compound may be used in combination. (B)
The compounding amount of the flame retardant is 1 to 35 parts by weight, preferably 5 to 30 parts by weight based on 100 parts by weight of the resin mixture (A).
If the compounding amount exceeds 35 parts by weight, the physical properties and light resistance of the obtained resin molded product decrease, and if the compounding amount is less than 1 part by weight, sufficient flame retardancy cannot be imparted to the obtained resin molded product. .

The anti-drip agent (C) used in the present invention is a PFP having a number average molecular weight of 1 × 10 ⁶ or more and a bulk density of 0.
It is 6 g / ml or more, has an average particle diameter of 100 to 1000 μm, and has spherical particles. In the present invention, PFP refers to a homopolymer of tetrafluoroethylene and a binary or tertiary copolymer of tetrafluoroethylene with hexafluoropropylene, perfluoroalkoxyethylene or the like, and a known suspension weight. It can be obtained by granulating PFP polymerized by an ordinary method or an emulsion polymerization method to a prescribed size by a granulator. The polymerization method may be either a suspension polymerization method or an emulsion polymerization method, but it is preferable to use the suspension polymerization method in order to obtain the above-mentioned PFP.

The number average molecular weight of the PFP used in the present invention is 1 × 10 ⁶ or more, preferably 5 × 10 ⁶ or more, more preferably 1 × 10 ⁷ to 1 × 10 ⁸ . If the number average molecular weight is less than 1 × 10 ⁶ , the fibrillating ability of PFP during combustion is low, and a sufficient drip prevention effect cannot be obtained.
In order for the (D) anti-drip agent of the present invention to have excellent dispersibility, the anti-drip agent must be granulated in a spherical shape with a particle diameter of 100 to 1000 μm, preferably 200 to 800 μm. If the particle diameter is less than 100 μm, the flowability of the powder decreases, the shearing during premixing increases, and the dispersibility of PFP deteriorates. If the particle diameter exceeds 1000 μm, the particle strength decreases and the premix decreases. Each of these is not preferable because the particles are likely to be broken.

(C) The bulk density of the anti-drip agent is 0.6 g.
/ Ml or more, preferably 0.6 to 1.5 g / ml
It is. If the bulk density is less than 0.6, the PFP particles are broken in the mixer during premixing and become fibrous, and fusion of the particles occurs, so that an unkneaded additive mass tends to remain in the obtained resin composition. Become. Bulk density is 1.5g / ml
When it exceeds, the PFP particles are less likely to be broken even during kneading, and thus there is a possibility that the PFP particles may be mixed in the resin composition to be manufactured without being kneaded.

Examples of the (D) anti-drip agent used in the present invention include, for example, "Fluon G-307", trade name "manufactured by Asahi IC Fluoropolymers Co., Ltd."
G-320 "," G-340 "," G-35 "
0 ", manufactured by Mitsui Dupont Fluorochemicals Co., Ltd., trade name" Teflon 820-J ", manufactured by Daikin Industries, Ltd." Polyflon TFE Molding Powder M-24 ",
"M-25", "M-31", "M-3"
2 "and" M-33 ". The PFP exemplified above is not used for conventional resin additives but for sheets, round bars,
It was commercially available for use in compression molding such as billet molding, and it was previously considered that adding it to a resin had no effect of preventing dripping. The present inventor, when adding these compression-molding PFPs to a thermoplastic resin, imparts the same anti-drip property as a conventionally used resin-adding PFP powder, and at the time of premixing in the resin composition manufacturing process. The inventors have found that the generation of additive lumps can be suppressed, and have reached the present invention.

The compounding amount of the (D) anti-drip agent is 0.01 to 1 part by weight, preferably 0.05 to 0.5 part by weight, based on 100 parts by weight of the resin mixture (A). The blending amount is 0.
When the amount is less than 01 parts by weight, the obtained resin molded product cannot be provided with sufficient anti-drip properties, and when the amount exceeds 1 part by weight, not only is it economically disadvantageous but also the obtained resin composition Of the liquid is reduced.

The production of the resin composition according to the present invention comprises:
This is performed by weighing (A) the resin mixture, (B) the flame retardant, and (C) the anti-drip agent in the above ranges, and mixing and kneading them by a known method. For example, powder, beads, flakes or a mixture of the respective components in the form of pellets, using a single-screw extruder, an extruder such as a twin-screw extruder, or a kneader such as a Banbury mixer, a pressure kneader, a two-roller or the like. By melt-kneading the resin composition, a resin composition can be produced. When it is necessary to mix a liquid, it may be kneaded by a known liquid injection device by the above method. Also, in that case, the kind and amount of lubricant, release agent, coloring agent, antistatic agent, antioxidant, other flame retardant, antimony trioxide, which do not inhibit the properties of the resin composition to be manufactured as required. Flame retardant aids, such as
Various resin additives such as other anti-drip agents, ultraviolet absorbers and heat-resistant stabilizers, fillers such as talc, reinforcing materials such as glass fibers, carbon fibers, and whiskers can be appropriately combined and added.

[0041]

Next, the present invention will be specifically described based on examples, but the present invention is not limited to the following examples unless it exceeds the gist. Examples 1 to 8 and Comparative Examples 1 to 4 (1) (A1) Graft copolymer (A1-1) Butadiene rubber content 5 by emulsion polymerization method
An acrylonitrile-butadiene-styrene copolymer in the form of a white powder having 0% by weight, a rubber weight average particle diameter of 0.3 μm, a graft ratio of 40%, an acrylonitrile content of 25% by weight, and a matrix weight average molecular weight of 80,000 was polymerized. It was used as (A1-1).

(A1-2) A butadiene rubber content of 15% by weight and a weight average particle size of the rubber of 1.4 μm were obtained by a suspension polymerization method.
m, a graft ratio of 60%, an acrylonitrile content of 24% by weight, and a matrix-weight acrylonitrile-butadiene-styrene copolymer having a weight average molecular weight of 130,000 were polymerized and used as (A1-2).

(2) (A2) Copolymer An acrylonitrile-styrene copolymer having an acrylonitrile content of 26% by weight and a weight average molecular weight of 160,000 was polymerized by a bulk polymerization method and used as the (A2) copolymer.

(3) (A3) Polymer Commercially available polycarbonate resin (manufactured by Mitsubishi Engineering-Plastics Corporation, trade name NOVAREX 7022)
A, 7030A). (4) (B) Flame retardant (B-1) Halogenated bisphenol compound Commercially available tetrabromobisphenol A (trade name: RB100PC, manufactured by Albemarle Corporation) was used. The structure is shown below.

[0045]

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(B-2) Halogenated Epoxy Compound A commercially available tetra-bromobisphenol A-type epoxy oligomer (Epototo TB62, trade name, manufactured by Toto Kasei Co., Ltd.) was used. The structure is shown below.

[0047]

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(However, a mixture of n = 0 and 1)

(B-3) Halogenated triazine compound Commercially available tris (tribromophenoxy) cyanuric acid ester (Daiichi Kogyo Seiyaku Co., Ltd., trade name Pyrogard SR)
245) was used. The structure is shown below.

[0050]

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(B-4) Phosphate Compound A commercially available phosphate ester dimer (trade name PX-200, manufactured by Daihachi Chemical Industry Co., Ltd.) having the following structure was used as the phosphate compound.

[0052]

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(5) (C) Anti-drip agent (C-1) Commercially available PFP granules for compression molding (manufactured by Asahi ICI Fluoropolymers Co., Ltd., trade name: Fluon G3)
50) was used as (C-1). The analytical values are shown in Table 1.

(C-2) A commercially available PFP granulated product for compression molding (trade name, manufactured by Asahi ICI Fluoropolymers Co., Ltd.)
Fluon G345) was used as (C-2). The analytical values are shown in Table 1.

(C-3) As a comparative example, a commercially available PFP powder (trade name, manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.)
(Teflon 6CJ) was used as (C-3). The analytical values are shown in Table 1.

[0056]

[Table 1]

(6) (D) Antimony trioxide As a flame retardant aid, commercially available antimony trioxide (trade name: Fireshield H, manufactured by Laurel Industries, Ltd.)
It was used.

(7) Production and Evaluation of Resin Composition The above (A1) graft copolymer, (A2) copolymer,
(A3) polymer, (B) flame retardant, (C) PFP, (D)
Antimony trioxide was weighed in the proportions (parts by weight) shown in Tables 2 and 3 and mixed by a tumbler, and the resulting mixture was kneaded with a twin-screw extruder equipped with a screw feeder to obtain a resin composition. Pellets were produced. The melt flow rate was measured from the pellets of the resin composition, and a test piece was prepared by an injection molding method. The Izod impact strength of each test piece was measured by the method shown below, and
An L burn test was performed. 9 for the dispersion state of the additive
Ten test pieces of 0 × 50 × 3 mm were molded, and the number was determined by the number of test pieces in which an unkneaded additive mass was confirmed on the surface of the molded product. Tables 2 and 3 show the measurement results.

Melt flow rate 10 k at 220 ° C. in accordance with JIS-K7210
The measurement was performed with a load of g, which was used as an index of fluidity.・ Izod impact strength Measured at 23 ° C by a method based on JIS-K7110,
It was used as an index of impact resistance (test piece thickness: 1/8 inch, with V notch). -UL burning test A vertical burning test was performed by a method based on UL94 issued by Underwriter Laboratories of the United States, and it was used as an index of flame retardancy. V-0 class test piece thickness 1/12 inch, 5V class test piece thickness 1/10 inch.

[0060]

[Table 2]

[0061]

[Table 3]

As can be seen from Tables 2 and 3, in the process for producing the resin composition according to the present invention, the use of the specific anti-drip agent (C) resulted in excellent fluidity of the resin composition and excellent resin molded product. While maintaining excellent impact resistance and flame retardancy, the dispersibility of the anti-drip agent is improved, clogging of the feeder feeder of the extruder, mixing of unmixed additive mass into the obtained resin composition, etc. It can be seen that the problem (1) is solved (Examples 1 to 8). When a commercially available PFP powder for resin addition is used as an anti-drip agent, in addition to the blockage of the raw material feed feeder, the dispersion of the additive becomes poor and a large amount of unkneaded additive lumps in the obtained resin composition. (Comparative Examples 1 to 4).

[0063]

According to the present invention, a flame-retardant thermoplastic resin having excellent appearance and anti-drip effect while maintaining excellent physical properties and flame retardancy by using a specific form of PFP as an anti-drip agent. A method for easily producing the composition can be provided, and its industrial utility value is extremely high.

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Claims (1)

[Claims] (A) The following (A1) and / or (A)
2) or (A1) and / or (A2) and (A
To 100 parts by weight of the thermoplastic resin mixture comprising 3)
When blending (B) 1 to 35 parts by weight of a flame retardant comprising an organic halogen compound and / or an organic phosphorus compound and (C) 0.01 to 1 part by weight of a drip inhibitor comprising a perfluoropolymer, Production of a flame-retardant thermoplastic resin composition characterized by using a perfluoropolymer which is a spherical particle having a number average molecular weight of 1 × 10 ⁶ or more, a bulk density of 0.6 g / ml or more, and an average particle diameter of 100 to 1000 μm. Method. (A1) 60 to 100% by weight of an aromatic vinyl monomer and 0 to 40% by weight of a monomer copolymerizable with an aromatic vinyl monomer
(A2) 60 to 100% by weight of an aromatic vinyl monomer and a monomer copolymerizable with an aromatic vinyl monomer 0-40% by weight
(A3) Polycarbonate, polyphenylene ether,
At least one selected from the group consisting of saturated polyesters
Seed polymer