JPH05287119A - Flame retardant resin composition excellent in appearance - Google Patents

Abstract

PURPOSE:To obtain the subject composition, capable of providing a molding remarkably improved in appearance while holding the flame retardancy and suitable as household appliance parts, etc., by blending a thermoplastic resin with a phosphorus-containing flame retardant and a triazine skeleton-containing compound having a specific particle diameter. CONSTITUTION:The objective composition is obtained by blending (A) a thermoplastic resin with (B) a phosphorus-containing flame retardant composed of an organophosphorus compound (preferably diphenyl resorcinyl phosphate) and/or red phosphorus and (C) a triazine skeleton-containing compound (preferably melamine) having 0.01-10mum particle diameter of 50% cumulative distribution measured by a laser micron sizer method so as to provide preferably 50-80wt.% component (A) and 1-40wt.% each of components (B) and (C). A polymer blend of a rubber-modified styrenic resin containing a diene-based rubber such as polybutadiene dispersed in a matrix of a vinyl aromatic polymer such as polystyrene with poly(2,6-dimethyl-1,4-phenylene ether) is preferred as the component (A).

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a resin composition having excellent flame retardancy. More specifically, it relates to a flame-retardant resin composition having an excellent appearance.

[0002]

2. Description of the Related Art Thermoplastic resins are superior in moldability as compared with inorganic materials such as glass, and are also excellent in impact resistance, so that they can be used in a wide variety of fields including automobile parts, home electric appliance parts, and OA equipment parts. Has been used in the field of. recent years,
Due to safety concerns, the demand for flame retardancy is increasing for plastic materials used in such fields, and various flame retardancy standards have been established. Various methods have been devised as a method for imparting flame retardancy to a resin that is easily flammable, but generally, halogen compounds such as bromine compounds having a high flame retardant effect, and antimony oxide if necessary. Is added to the resin. As bromine compounds, nuclear bromine-substituted aromatic compounds such as tecabromodiphenyl ether, tetrabromobisphenol A, and brominated phthalimide are known, but the method by adding these flame retardants gives excellent flame retardancy. However, the impact strength and the heat distortion temperature are lowered, and in some cases, the flame retardant bleeds out on the surface of the resin molded product to deteriorate the appearance of the molded product. Furthermore, when the resin is molded, the halogen compounds are thermally decomposed to generate a gas harmful to the human body, and the mold and the screw are corroded.

For this reason, methods of flame retarding without using halogen compounds have been investigated. As such a method, a method of adding a hydrated metal compound such as aluminum hydroxide or magnesium hydroxide to a resin is known, but in order to obtain sufficient flame retardancy, a large amount of the above hydrated metal compound is added. However, there is a drawback that the original characteristics of the resin are lost.

On the other hand, as a method not using such a hydrated metal compound, a flame-retardant resin composition comprising a nitrogen-containing compound selected from vinyl aromatic resin, polyphenylene ether, organic phosphorus compound, triazine and / or its derivative. (JP-A-54-38348, JP-A-54-383)
49, European Patent No. 311,909), A
Flame-retardant resin composition obtained by blending BS resin with red phosphorus, melamine, and a heat-crosslinking curable resin (JP-A-61-291643).
Issue). However, the above-mentioned JP-A-54-38348, JP-A-54-38349, European Patent No. 311,909, and JP-A-6-36908.
The resin compositions described in JP-A 1-2911643 are useful flame-retardant resin materials that do not use halogen compounds, but since they mainly contain polyphenylene ether having low fluidity, the moldability of the resin composition is low. There was the problem of being inferior.

Further, melamine, which is one of the compounds containing a triazine skeleton, is insoluble and infusible, and therefore, there is a problem that the surface smoothness of the exposed product is impaired. Moreover, when a black colorant is used to adjust to a dark color, the problem arises that the melamine floats up in spots and the appearance is significantly impaired.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a flame-retardant resin composition which does not have the above-mentioned problems, that is, has an excellent appearance. Is.

[0007]

Means for Solving the Problems As a result of intensive investigations by the present inventors to improve the appearance of thermoplastic resins, as compared with (A) thermoplastic resins and (B) phosphorus-containing flame retardants of the prior art, (C) The present inventors have found that by combining a triazine skeleton-containing compound having a specific particle diameter, a molded article having surprisingly improved flame retardancy and a dramatically improved appearance can be obtained, and the present invention has been accomplished.

That is, the present invention is a resin composition containing (A) a thermoplastic resin, (B) a phosphorus-containing flame retardant which is an organic phosphorus compound and / or red phosphorus, and (C) a compound containing a triazine skeleton. And the (C)
The triazine skeleton-containing compound has an average particle size (cumulative distribution 50% particle size by the laser micron sizer method) of 0.0
A flame-retardant resin composition having an excellent appearance, which is characterized by having a thickness of 1 to 10 μm.

The present invention will be described in detail below. The resin composition of the present invention comprises (A) a thermoplastic resin, (B) a phosphorus-containing flame retardant, and (C) a triazine skeleton-containing compound having a specific particle size, and comprises (A), (B), and (C). It becomes difficult to achieve the object of the invention if any of them is lacking. The component (A) is a main component of the molding resin composition and plays a role of maintaining the strength of the molded product, and the component (B) is a component for imparting flame retardancy to the component (A). , (C) component is a component for promoting the flame retardancy of the (B) component. here,
Only when the average particle size of the component (C) is 0.01 to 10 μm, flame retardancy and excellent appearance are combined.

The above-mentioned (A) component thermoplastic resin of the present invention includes polystyrene type, polyolefin type, polyvinyl chloride type, polyphenylene ether type, polyamide type, polyester type, polyphenylene sulfide type, polycarbonate type, polymethacrylate type, etc. Is a thermoplastic resin. Here, a polystyrene-based thermoplastic resin is particularly preferable as the thermoplastic resin, and a polymer blend of a rubber-modified styrene-based resin and polyphenylene ether is more preferable.

The rubber-modified styrenic resin as the component (A) of the present invention is a graft polymer in which a rubber-like polymer is dispersed in particles in a matrix composed of a vinyl aromatic polymer. Known monomer bulk polymerization, bulk suspension polymerization, solution polymerization, or a mixture of aromatic vinyl monomer and vinyl monomer copolymerizable with aromatic vinyl monomer in the presence of a polymer. It is obtained by emulsion polymerization.

Examples of such resins include impact-resistant polystyrene, ABS resin (acrylonitrile-butadiene-styrene copolymer), AAS resin (acrylonitrile-acrylic rubber-styrene copolymer), AES resin (acrylonitrile-ethylene). Propylene rubber-styrene copolymer) and the like. Here, the rubber-like polymer needs to have a glass transition temperature (Tg) of -30 ° C or lower, and if it exceeds -30 ° C, the impact resistance decreases.

Examples of such a rubber-like polymer include diene rubbers such as polybutadiene, poly (styrene-butadiene) and poly (acrylonitrile-butadiene), and saturated rubbers obtained by hydrogenating the above diene rubbers, isoprene rubbers, chloroprene rubbers. , An acrylic rubber such as polybutyl acrylate, an ethylene-propylene-diene monomer terpolymer (EPDM), and the like, and a diene rubber is particularly preferable.

The aromatic vinyl monomer which is an essential component in the graft-polymerizable monomer mixture is, for example, styrene or α.
-Methylstyrene, para-methylstyrene, p-chlorostyrene, p-bromostyrene, 2,4,5-tribromostyrene, etc., with styrene being the most preferred, but mainly other than styrene and other aromatic vinyl monomers May be copolymerized.

If necessary, one or more monomer components copolymerizable with the aromatic vinyl monomer may be introduced as a component of the rubber-modified styrene resin. When it is necessary to enhance oil resistance, unsaturated nitrile monomers such as acrylonitrile and methacrylonitrile can be used. When it is necessary to reduce the melt viscosity at the time of blending, an acrylate ester composed of an alkyl group having 1 to 8 carbon atoms can be used. Further, when it is necessary to further increase the heat resistance of the polymer composition, α-
Monomers such as methylstyrene, acrylic acid, methacrylic acid, maleic anhydride, and N-substituted maleimide may be copolymerized. The content of the vinyl monomer copolymerizable with the vinyl aromatic monomer in the monomer mixture is 0 to 40% by weight.

The rubber-like polymer in the rubber-modified styrene resin of the present invention is preferably 5 to 80% by weight, more preferably 10 to 50% by weight, and the graft-polymerizable monomer mixture is preferably 95 to 20%. %, More preferably 90 to 50% by weight. Outside this range, it becomes difficult to balance the impact resistance and rigidity of the desired polymer composition. Further, the rubber particle type of the styrene polymer is preferably 0.1 to 5.0 μm, and particularly 0.2 to 3.
0 μm is preferred. Outside the above range, the impact resistance tends to decrease.

The polyphenylene ether (hereinafter, abbreviated as PPE) as the component (A) of the present invention is a homopolymer and / or a copolymer having a bonding unit represented by the following formula.

[0018]

[Chemical 1]

However, R ₁ , R ₂ , R ₃ and R ₄ are each selected from the group consisting of hydrogen, hydrocarbons and substituted hydrocarbon groups and may be the same or different from each other. As a concrete example of this PPE, poly (2,
6-dimethyl-1,4-phenylene ether, 2,6-
Copolymers of dimethylphenol and 2,3,6-trimethylphenol are preferable, and among them, poly (2,6-
Dimethyl-1,4-phenylene ether) is preferred.
The method for producing such PPE is not particularly limited, and, for example, a complex of a cuprous salt and an amine obtained by the method described in US Pat. No. 3,306,874 is used as a catalyst, and, for example, 2,6 xylesole is used. Can be easily produced by oxidatively polymerizing the above compounds. In addition, US Pat. No. 3,306,875 and US Pat. No. 3,25
No. 7,357, U.S. Pat. No. 3,257,358, Japanese Patent Publication No. 52-17880, and Japanese Patent Laid-Open No. 50-88.
It can be easily produced by the method described in JP-A-51197. The reduced viscosity of the PPE used in the present invention (0.5 g
/ Dl, chlorofilm solution, measured at 30 ° C) is 0.2
It is preferably in the range of 0 to 0.7 dl / g, and 0.
It is more preferably in the range of 30 to 0.60 dl / g. Examples of means for satisfying the above requirements regarding the reduced viscosity of PPE include adjustment of the amount of catalyst during the production of PPE.

The phosphorus-containing flame retardant of the component (B) of the present invention is a red phosphorus and / or organic phosphorus compound. As a specific example of the above-mentioned red phosphorus, in addition to general red phosphorus, the surface thereof is previously coated with a metal hydroxide film selected from aluminum hydroxide, magnesium hydroxide, zinc hydroxide and titanium hydroxide. , Aluminum hydroxide, magnesium hydroxide, zinc hydroxide, titanium hydroxide coated with a film made of a metal hydroxide and a thermosetting resin, aluminum hydroxide, magnesium hydroxide, hydroxide It is also possible to suitably use a film in which a metal hydroxide selected from zinc and titanium hydroxide is doubly coated with a film of a thermosetting resin.

Examples of the organic phosphorus compound as the component (B) include phosphine, phosphine oxide, biphosphine, phosphonium salt, phosphinic acid salt, phosphoric acid ester and phosphorous acid ester. More specifically, methyl neopentyl phosphite, pentaerythritol diethyl diphosphite, methyl neopentyl phosphonate, phenyl neopentyl phosphate,
Pentaerythritol diphenyl diphosphate, dicyclopentyl hypophosphite, dineopentyl hypophosphite, phenylpyrocatechol phosphite, ethylpyrocatechol phosphate, dipyrocatechol hypophosphite and the like can be mentioned.

Here, as the organic phosphorus compound as the component (B), an aromatic phosphoric acid ester containing a hydroxyl group is preferable. The above-mentioned hydroxyl group-containing aromatic phosphoric acid ester is a phosphoric acid ester containing one or more phenolic hydroxyl groups in tricresyl phosphate, triphenyl phosphate, condensed phosphoric acid ester thereof or the like, For example, the following compounds.

[0023]

[Chemical 2]

[0024]

[Chemical 3]

(However, Ar ₁ , Ar ₂ , Ar ₃ and A
r ₄ , Ar ₅ and Ar ₆ are a phenyl group, a xylenyl group,
It is an aromatic group selected from an ethylphenyl group, an isopropylphenyl group, and a butylphenyl group, and at least one hydroxyl group is substituted with the above aromatic group in the phosphoric acid ester (B). Further, n represents an integer of 0 to 3, and m represents an integer of 1, 2, 3, 4, 5 or more. ) Among the (B) hydroxyl group-containing aromatic phosphoric acid esters of the present invention, diphenylresorcinyl phosphate 4 is particularly preferable, and its production method is disclosed in, for example, JP-A-1-223158. Obtained by the reaction of phenol, hydroxyphenol, aluminum chloride and phosphorus oxychloride.

[0026]

[Chemical 4]

The triazine skeleton-containing compound as the component (C) of the present invention is a component for further improving the flame retardancy as a flame retardant aid for the phosphorus-containing flame retardant (B). Specific examples thereof include melamine, succinoguanamine, adipoguanamine, methylglutaloganamin, melamine phosphate, and melamine cyanurate.
Melamine is most preferred.

Here, it is preferable that the average particle size of the component (C) (50% particle size of cumulative distribution by laser micron sizer method) is in the range of 0.01 to 10 μm. When the average particle diameter exceeds 10 μm, when a black colorant is used for toning a dark color, the appearance rises in spots and the appearance remarkably deteriorates. The next coagulation occurs and the appearance is deteriorated as well.

As the method for atomizing the component (C) of the present invention, a known wet ball mill grinding method, a method using a grinder such as a hammer mill, a rotary cutter mill or a gauge mill is known. If necessary, the resin composition of the present invention may contain (D) a dark colorant and (E) a higher fatty acid amide compound.

The dark colorant (D) is selected from pigments or dyes. For example, carbon black is generally used as a black pigment, and channel black, furnace black, acetylene black, anthracene.
Black, oil smoke, pine smoke, graphite, etc. are known. on the other hand,
Alizarin blue black B or the like is used as the black dye.

The above-mentioned (E) higher fatty acid amide compound is a component for improving fluidity, and is a reaction product of a higher fatty acid and (a) diamine or (b) amino alcohol. Here, the higher fatty acid is a fatty acid having an alkyl group or an alkenyl group having 11 to 21 carbon atoms, and stearic acid is particularly preferable.

The above-mentioned diamines have 2 to 10 carbon atoms.
Of the above hydrocarbon diamines, and ethylenediamine is particularly preferable. Further, the above-mentioned amino alcohols are hydrocarbon amino alcohols having 2 to 10 carbon atoms, and examples thereof include monoethanolamine, 3-amino-1-propanol and 4-amino-1-butanol.

As the higher fatty acid amide compound of the component (E) of the present invention, ethylene bis stearylamide is particularly preferable, and the fluidity is improved while maintaining flame retardancy, heat resistance and impact resistance. Let (A) which constitutes the resin composition of the present invention
Regarding the amount ratio of the thermoplastic resin, (B) phosphorus-containing flame retardant, (C) triazine skeleton-containing compound, (D) dark colorant, and (E) higher fatty acid amide compound, (A) is 50 to 8
0% by weight, (B) 1 to 40% by weight, (C) 1 to 40%
It is preferable that the content of (D) is 0 to 20% by weight and the content of (E) is 0 to 20% by weight. Outside the above range, it tends to be difficult to balance flame retardancy, heat resistance and impact resistance.

The resin composition of the present invention can be obtained by, for example, melt-kneading the above-mentioned components in a commercially available single-screw extruder, a twin-screw extruder or the like. At that time, an antioxidant such as BHT, An ultraviolet absorber, a tin-based heat stabilizer, a flame retardant, a lubricant such as stearic acid and zinc stearate, a filler, a reinforcing agent, a dye, a pigment and the like can be added if necessary.

By subjecting the composition of the present invention thus obtained to, for example, injection molding or extrusion molding, a molded article excellent in appearance and flame retardancy can be obtained.

[0036]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. The measurements in Examples and Comparative Examples were performed using the following methods or measuring instruments. (1) Weight average particle diameter of rubber: The weight average particle diameter of the rubber-modified styrene resin is calculated by the following formula by calculating the particle diameter of the butadiene polymer in the transmission electron microscope photograph taken by the ultrathin section method of the resin composition. Calculate by

Weight average particle diameter = ΣNi · Di ⁴ / ΣNi · Di ³ (where Ni is the number of butadiene-based polymer particles having a particle diameter of Di). (2) Reduced viscosity ηsp / c Rubber modification 18 g of methyl ethyl ketone on 1 g of styrene resin
Add a mixed solvent of ml and 2 ml of methanol,
Shake for hours and centrifuge at 18000 rpm for 30 minutes at 5 ° C. The supernatant was taken out, the resin component was precipitated with methanol, and then dried.

0.1 g of the resin thus obtained was dissolved in toluene to give a solution having a concentration of 0.5 g / dl, and 10 ml of this solution was put in a Canon-Fenske viscometer.
At 30 ° C., the number of seconds t _{1 during} which the solution flows was measured. On the other hand, the flowing down time t ₀ of pure toluene was separately measured with the same viscometer and calculated by the following formula. (3) Tensile strength, tensile elongation; measured by a method according to ASTM-D638. (4) Flexural strength, flexural modulus; measured by a method according to ASTM-D790. (5) Izod impact strength; measured by a method according to ASTM-D256 (V notch, 1/4 "test piece) (6) Vicat softening temperature; measured by a method according to ASTM-D1525, and a heat resistance scale (7) Melt flow rate (MFR): Measured by a method according to ASTM-D-1238, which is an index of fluidity, and extrusion rate per 10 minutes (g / g) under a load of 5 kg and a melting temperature of 200 ° C. (8) Flame retardancy and drip property VB (Vertical Bur) compliant with UL-94.
Ning) method (1/8 inch test piece). (9) Average Particle Size of Triazine Skeleton-Containing Compound Dimethyl triamide (D
MF), SK LA manufactured by Seishin Enterprise Co., Ltd.
The particle size distribution was measured with a SER MICRON SIZER 7000S. The average particle size accounts for 50% of all particles when counted from the smallest particles (cumulative distribution 50
%) Is the particle size. Please refer to FIG. (10) Appearance The injection-molded product of the resin composition was visually determined. In addition, the surface condition was observed with an inverted metallographic microscope (PEN3, manufactured by OLYMPUS Co., Ltd.).

[0039]

Example 1 (a) Rubber Modified Styrene Resin (HIPS) Commercially available HIPS was used as the rubber modified styrene resin. a) HIPS-1 (Styron H manufactured by Asahi Kasei Corporation)
8117) Composition: Polybutadiene [(cis 1,4 bond / trans 1,4 bond / vinyl 1,2 bond = 95/2/3 (weight ratio)] 12.3% by weight Polystyrene 87.53% by weight Mineral oil 0.1. 17 wt% Reduced viscosity ηsp / c = 0.79 Weight average particle diameter of rubber 1.25 μm b) HIPS-2 (manufactured by Asahi Kasei Corporation Stylon H)
9010) Composition: Polybutadiene (same as HIPS-1) 9.5 wt% Polystyrene 88.5 wt% Mineral oil 2.0 wt% Reduced viscosity ηsp / c = 0.61 Weight average particle diameter of rubber 1.85 μm (b) ) Production of polyphenylene ether (PPE) After the inside of a stainless steel reactor having an oxygen blowing port at the bottom of the reactor and having a cooling coil and stirring blades inside was sufficiently replaced with nitrogen, cupric bromide 54. 8g, Gee n-
Butylamine 1110 g, and toluene 20 liters,
8.75 kg of 2,6-xylenol was dissolved in a mixed solvent of 16 liters of n-butanol and 4 liters of methanol and charged into a reactor. Oxygen was continuously blown into the reactor while stirring, and polymerization was performed for 180 minutes while controlling the internal temperature to 30 ° C. After the polymerization was completed, the precipitated polymer was filtered off. A methanol / hydrochloric acid mixture was added to this to decompose the residual catalyst in the polymer, and the polymer was thoroughly washed with methanol and dried to obtain powdery polyphenylene ether (referred to as PPE). Reduced viscosity is 0.55dl /
It was g.

In addition, the PPE and polystyrene (Styron 685, trade name, manufactured by Asahi Kasei Kogyo Co., Ltd.) in a weight ratio of 7
The mixture was mixed at 0/30 and melt-extruded at 350 ° C. in a twin-screw extruder. The obtained pellet is called PPE-MB. (C) Phosphorus-containing flame retardant a) Production of organic phosphorus compound containing hydroxyl group-containing aromatic phosphate ester Phenol 122.7 parts by weight (molar ratio 2.0), aluminum chloride 0.87 parts by weight (molar ratio) 0.01) was placed in a flask and 100 parts by weight of phosphorus oxychloride (molar ratio 1.0) was added dropwise at 90 ° C. over 1 hour. 71.7 parts by weight (molar ratio 1.0) of resorcin was added to the produced intermediate and further reacted. In order to complete the reaction, the temperature was gradually raised and finally raised to 180 ° C. to complete the esterification. Next, the reaction product was cooled and washed with water to remove the catalyst and the chlorine content, to obtain a phosphoric acid ester mixture (hereinafter referred to as FR). When this mixture was analyzed by GPC (gel permeation chromatography), diphenyl resorcinyl phosphate (the following formula 5, hereinafter TPP-
OH) and triphenyl phosphate (hereinafter TP)
P) and an aromatic condensed phosphoric acid ester (the following formula 6,
(Hereinafter referred to as TPP dimer), and the weight ratio was 54.2 / 18.3 / 27.5, respectively.

[0041]

[Chemical 5]

[0042]

[Chemical 6]

(D) Triazine skeleton-containing compound As the triazine skeleton-containing compound, commercially available melamine (average particle size 1.6 μm, manufactured by Mitsui Toatsu Kagaku Co., Ltd., trade name fine powder melamine) was used. (E.g. ML-1) (e) Higher fatty acid amide As a higher fatty acid amide, commercially available ethylenebisstearylamide (trade name Kao Wax EBF manufactured by Kao Corporation)
F) was used (designated EBS). (F) Black colorant Commercially available carbon black (manufactured by Cabot) was used as the black colorant.

The carbon black, polystyrene (trade name: Styron 679 manufactured by Asahi Kasei Kogyo Co., Ltd.) and the EBS were mixed at a weight ratio of 45/50/5 and melt-extruded with a twin-screw extruder. The obtained pellet is CB
-Referred to as MB. (G) Preparation and Evaluation of Composition HIPS-1 / HIPS-2 / PPE-MB / FR
/ ML-1 / EBS / CB-MB in a weight ratio of 45/44
Mixing in the ratio of / 36/25/20/3/1, 30mm
φ2-screw extruder (model AS30 manufactured by Nakatani Machinery Co., Ltd.)
Melt-extruded at 260 ° C. to prepare pellets.

Then, a test piece was prepared from the obtained pellet using an injection molding machine (model IS80A manufactured by Toshiba Machine Co., Ltd.) at a cylinder temperature of 200 ° C. and a mold temperature of 60 ° C., and the appearance and various physical properties were evaluated. .. The results are shown in Table 1. Further, FIG. 1 shows a schematic diagram of a micrograph of the surface of the molded product.

[0046]

Example 2 In Example 1, a commercially available melamine [(average particle size 5.0 μm, trade name: fine powder melamine manufactured by Nissan Kagaku Co., Ltd.) (referred to as ML-2)] is used in place of ML-1. Otherwise, the same experiment as in Example 1 was repeated. The results are shown in Table 1. Further, FIG. 2 shows a schematic diagram of a micrograph of the surface of the molded product.

[0047]

Comparative Example 1 In Example 1, except that commercially available melamine [(average particle size 20.0 μm, manufactured by Mitsui Toatsu Chemicals, Inc.) (referred to as ML-3)] was used instead of ML-1. The same experiment as in Example 1 was repeated. The results are shown in Table 1. Further, FIG. 3 shows a schematic diagram of a micrograph of the surface of the molded product.

[0048]

[Table 1]

[0049]

The composition of the present invention is a flame-retardant resin composition having an excellent appearance especially for a dark-colored molding.
This composition is suitable for home electric appliance parts, office automation equipment parts and the like, and plays a large role in the industrial world.

[Brief description of drawings]

FIG. 1 is a film type view of a photograph of an inverted metallographic microscope of the resin composition of Example 1 (average particle diameter of melamine is 1.6 μm).

FIG. 2 is a membranous diagram of an inverted metallurgical microscope photograph of the resin composition of Example 2 (average particle diameter of melamine: 5.0 μm).

FIG. 3 is a film diagram of an inverted metallurgical microscope photograph of the resin composition of Comparative Example 1 (average particle diameter of melamine: 20.0 μm).

FIG. 4 is a method for measuring the particle size of component (C) in the present invention.

Claims (1)

[Claims] 1. A (A) thermoplastic resin, (B) an organic phosphorus compound and / or a phosphorus-containing flame retardant which is red phosphorus, and
A resin composition containing a (C) triazine skeleton-containing compound, wherein the (C) triazine skeleton-containing compound has an average particle size (cumulative distribution 50 by a laser micron sizer method).
% Particle diameter) is 0.01 to 10 μm, a resin composition.