JP2000109658A - Flame retardant resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide non-halogen type flame retardant resin compositions which have a high flame retardant effect and are excellent in workability and safety by increasing the safety of heated red phosphorus and do not increase the amount formed of phosphoric acid which affects electrical characteristics. SOLUTION: Flame retardant resin compositions are obtained by previously melt mixing 100 pts.wt. thermoplastic aromatic polyester resin such as a polytetramethylene terephthalate, 1-15 pts.wt. coated red phosphorus powder composed of sphere-like red phosphorus free of shattered sides which have a cured resin coating without requiring shattering and can be directly obtained by the conversion treatment of white phosphorus, and 5-150 pts.wt. aromatic polycarbonate resin having a viscosity average molecular weight of 20,000-25,000, and further incorporating 0.05-5 pts.wt. at least one of titanium oxide, aluminum oxide, and molybdenum sulfide thereinto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a flame-retardant resin composition having a high flame retardancy. More specifically, the present invention relates to a non-halogen flame-retardant resin composition which enhances the stability of red phosphorus, is excellent in workability and safety, and has no increase in phosphoric acid generation which affects electric properties.

[0002]

2. Description of the Related Art Polybutylene terephthalate (PBT)
And other polyester resins have excellent mechanical properties, heat resistance, chemical resistance, and the like, and are therefore widely used as molded articles in applications such as the electric and electronic fields and the automobile field.

[0003] Among these, there are many uses requiring flame retardancy, and mainly halogen compounds and antimony compounds are used as flame retardants,
A resin having flame retardancy imparted by using as a flame retardant aid is provided.

[0004] However, halogen-based flame retardants may cause decomposition products to corrode metals as electric products, and some halogen-based flame retardants have non-halogen-based flame retardants because of their environmental impact. Fuel resins are needed.

[0005] Phosphorus compounds are non-halogen flame retardants, and low molecular phosphate esters such as triphenyl phosphate (TPP) have been frequently used as typical organic phosphorus compounds. However, a polyester resin such as polybutylene terephthalate has a relatively high processing temperature, and has a problem of bleed out and heat resistance in the case of a low molecular weight phosphate ester.

JP-A-7-126498 discloses a polyester resin, an epoxy compound having two or more epoxy groups in a molecule, a phenol resin and / or phosphorus, nitrogen having a functional group capable of reacting with an epoxy group.
A non-halogen flame retardant for polyester resin is disclosed which is obtained by melting and reacting at least one non-halogen flame retardant compound selected from boron compounds.

JP-A-7-278267 discloses a flame-retardant polyester resin composition in which 5 to 50 parts by weight of the non-halogen flame retardant is mixed with 100 parts by weight of a polyester resin.

[0008] The non-halogen flame retardant is characterized in that an epoxy compound having two or more epoxy groups in a molecule is used.

JP-A-8-188717 discloses thermoplastic resins such as polystyrene and polyester, phosphorus compounds such as phosphates and phosphites, phenolic resins (eg cresol) and aralkyl halides (eg α, α-). A flame-retardant resin composition comprising a phenol aralkyl resin such as a reaction product of dichloro-p-xylene) is disclosed.

Japanese Patent Application Laid-Open No. Hei 8-208888 discloses a thermoplastic resin such as polystyrene or polyester, a phosphorus compound such as a phosphoric acid ester or a phosphite, and a phenolic resin from a phenol substituted at the ortho or para position. A flame retardant resin composition is disclosed.

On the other hand, among the phosphorus compounds, those which use red phosphorus, which exhibits excellent flame retardancy even when added in a small amount, include the following.

[0012] Journal of Fire retardant chemistry (Journalof Fire R)
etardant Chemistry) vol. 7,
69-76, 1980 discloses that polystyrene is flame retarded by red phosphorus and a phenolic resin.

[0013] Also, Plastics Engineering Nov.
Ember, 29-31, 1993 discloses that PBT is flame retarded by red phosphorus and a phenolic resin.

Japanese Patent Publication No. 2-37370 discloses 99-34 parts by weight of a thermoplastic polyester resin having a softening point of 150 ° C. or more, such as polyethylene terephthalate.
A flame-retardant polyester resin composition comprising 1 to 25 parts by weight of red phosphorus and 10 to 55 parts by weight of a reinforcing filler coated with a thermosetting resin is disclosed.

Techniques for adding a metal oxide for the purpose of inactivating red phosphorus are disclosed in JP-A-51-42746 and JP-A-51-150553.

[0016]

SUMMARY OF THE INVENTION An object of the present invention is to provide a non-halogen flame retardant which has a high flame retardant effect, is excellent in workability and safety, and suppresses the generation of phosphoric acid which affects electric characteristics. An object of the present invention is to provide a conductive resin composition.

[0017]

That is, the present invention relates to a method for converting yellow phosphorus directly by a method of converting (A) 100 parts by weight of a thermoplastic aromatic polyester resin, (B) a coating of a cured resin, and not requiring pulverization. 1 to 15 parts by weight of a coated red phosphorus powder comprising spherical red phosphorus having no crushed surface and (C) an aromatic polycarbonate resin 5-1 having a viscosity average molecular weight of 20,000 to 25,000
50 parts by weight, and (D) 0.05 to 5 parts by weight of at least one compound selected from the group consisting of titanium oxide, aluminum oxide and molybdenum sulfide, and the red phosphorus powder (B) and the aromatic polycarbonate resin ( C) is a flame-retardant resin composition previously melt-kneaded.

The flame-retardant resin composition of the present invention has a
1 g of red phosphorus containing the amount of phosphine generated after heating for 4 hours
5 × 10 ^-5 g or less, 121 ° C., 100% R
H, the flame-retardant resin composition, wherein the amount of phosphoric acid generated under a wet heat condition of 2.1 atm is 3 × 10 ⁻⁴ g or less per 1 g of red phosphorus contained in the flame-retardant resin composition. Included as a preferred embodiment.

The present invention is also a flame-retardant resin composition for an electric / electronic part, comprising the above-mentioned flame-retardant resin composition and having the above-mentioned properties. Hereinafter, the present invention will be described in detail.

[Aromatic Polyester Resin] In the present invention, the thermoplastic aromatic polyester resin (A) contains an aromatic dicarboxylic acid as a main dicarboxylic acid component and an aliphatic diol having 2 to 10 carbon atoms as a main glycol component. Polyester. Preferably, at least 80 mol%, more preferably at least 90 mol%, of the dicarboxylic acid component comprises the aromatic dicarboxylic acid component. The glycol component preferably comprises at least 80 mol%, more preferably at least 90 mol%, of the glycol component of an aliphatic diol component having 2 to 10 carbon atoms.

Preferred examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, methyl terephthalic acid, methyl isophthalic acid, and 2,6-naphthalene dicarboxylic acid. These can be used alone or in combination of two or more. Examples of the secondary dicarboxylic acid other than the aromatic dicarboxylic acid include aliphatic or alicyclic dicarboxylic acids such as adipic acid, sebacic acid, decanedicarboxylic acid, azelaic acid, dodecanedicarboxylic acid, and cyclohexanedicarboxylic acid.

Examples of the aliphatic diol having 2 to 10 carbon atoms include aliphatic diols such as ethylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol and the like, and fatty acids such as 1,4-cyclohexanedimethanol. A cyclic diol can be mentioned. One or more of these aliphatic diols and alicyclic diols can be used together. Examples of the secondary glycol other than the aliphatic diol having 2 to 10 carbon atoms include p, p'-dihydroxyethoxybisphenol A and polyoxyethylene glycol.

As the thermoplastic aromatic polyester resin (A), the main dicarboxylic acid component is at least one dicarboxylic acid selected from the group consisting of terephthalic acid and 2,6-naphthalenedicarboxylic acid, and the main diol is Polyesters comprising an ester unit whose component is at least one diol selected from the group consisting of ethylene glycol, triethylene glycol and tetramethylene glycol are preferred.

Among them, polyesters containing ethylene terephthalate, trimethylene terephthalate, tetramethylene terephthalate or tetramethylene-2,6-naphthalenedicarboxylate as a main repeating unit are preferred. Further, a polyester elastomer having these repeating units as main repeating units of a hard segment can also be used.

As a soft segment of a polyester elastomer having tetramethylene terephthalate or tetramethylene-2,6-naphthalenedicarboxylate as a main repeating unit of a hard segment, for example, a dicarboxylic acid is formed from terephthalic acid, isophthalic acid, sebacic acid and adipic acid. Consisting of one or more dicarboxylic acids selected from the group consisting of
10 long-chain diol and H (OCH ₂ CH ₂ ) _i OH
(I = 2 to 5) It is possible to use one composed of one or more diols selected from the group consisting of polyester having a melting point of 100 ° C. or lower or amorphous, or composed of polycaprolactone.

The main component is a component of 80 mol% or more, preferably 90 mol% or more of all dicarboxylic acid components or all glycol components, and the main repeating unit is at least 80 mol% of all repeating units, preferably Is 90
It is a repeating unit of at least mol%.

The thermoplastic aromatic polyester resin used in the present invention has an intrinsic viscosity of preferably 0.5 to 1.4 dl / g, more preferably 0.6 to 1.2 dl / g, measured at 35 ° C. in orthochlorophenol. It is. When the intrinsic viscosity is less than 0.5, the mechanical strength of the obtained composition is low, and thus it is not preferable. When the intrinsic viscosity is more than 1.4, the fluidity of the obtained composition is unfavorably reduced.

[Coated Red Phosphorus Powder] In the present invention, a coated red phosphorus powder comprising a sphere-like red phosphorus without a crushed surface, which has a cured resin coating and is directly obtained by a yellow phosphorus conversion treatment method which does not require pulverization. B) is used.

Originally, there is a danger that red phosphorus alone may ignite or generate phosphine due to high temperature or mechanical shock.

Red phosphorus is produced by heating yellow phosphorus for several days in a reaction vessel usually referred to as a conversion kettle. In this method, red phosphorus is obtained as a lump and is used as a flame retardant and as an additive in a resin composition. If used, a grinding step is required. The red phosphorus thus obtained forms many active sites on the particle surface by pulverization, and reacts with oxygen and water molecules to cause ignition, and also to generate phosphine and oxidation products.

In the present invention, instead of the conventional red phosphorus obtained through such a pulverizing step, a sphere without a crushed surface directly obtained by a yellow phosphorus conversion treatment method is used. By using such red phosphorus for spheres, the surface is extremely stabilized, the stability of red phosphorus is increased, and the stability of the composition is improved.

The method for producing sphere-like red phosphorus used in the present invention includes the following method. That is, in a closed vessel replaced with an inert gas, yellow phosphorus is heated to a temperature near the boiling point to start the conversion reaction of red phosphorus, and the reaction is stopped when the conversion or the particle size of red phosphorus reaches a desired level. Then, amorphous red phosphorus composed of microsphere-like particles or aggregates thereof that does not require any pulverization can be obtained by distilling unconverted yellow phosphorus. The conversion and the particle size of red phosphorus are controlled by the reaction time and the reaction temperature.
Particularly preferred is 50 ° C. and a conversion of 60% or less.

The cured resin of the coating of the coated red phosphorus powder is preferably a cured resin of at least one curable resin selected from the group consisting of phenol resins, epoxy resins, unsaturated polyester resins, melamine resins, urea resins and aniline resins. Things.

The coated red phosphorus powder may further contain at least one inorganic compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc hydroxide and hydroxide of titanium in the cured resin of the coating. Preferably
These inorganic compounds may be further contained in contact with red phosphorus under the cured resin film.

The average particle size of the red phosphorus powder is preferably 5 to 40.
μm, more preferably in the range of 25 to 35 μm. If the average particle size is less than 5 μm, it is not preferable from the viewpoint of uniformity of dispersion, and if it exceeds 40 μm, it is not preferable from the viewpoint of reduction in mechanical properties and flame retardancy.

The coated red phosphorus powder (B) comprising a spherical red phosphorus having no crushed surface and having a coating of a cured resin and directly obtained by a yellow phosphorus conversion treatment method that does not require pulverization is a thermoplastic aromatic polyester resin (B). A) 1 to 100 parts by weight
It is blended so as to be in a range of 15 parts by weight. If the amount is less than 1 part by weight, the flame retardancy is insufficient, and if the amount exceeds 15 parts by weight, the mechanical properties of a molded article obtained from the flame retardant resin composition deteriorate.

The coated red phosphorus powder is used as master pellets previously melt-kneaded with an aromatic polycarbonate resin. Viscosity-average molecular weight as an aromatic polycarbonate resin used to melt-knead into a master bellet in advance
20000 to 25000 aromatic polycarbonate resins are used.
By using the master pellet, a resin composition having excellent mechanical strength of a molded article obtained when the molded article is formed can be obtained. Not only is it desirable in terms of safety,
By actually pelletizing the aromatic polycarbonate resin and the coated red phosphorus powder into a master pellet, a thermoplastic resin other than the aromatic polycarbonate resin and the coated red phosphorus powder are master-pelletized, and the case where the aromatic polycarbonate resin is further added. In comparison, the flame retardancy is significantly increased. If the viscosity average molecular weight of the aromatic polycarbonate is less than 20,000, the flame retardancy is reduced, and if it exceeds 25,000, the flowability is reduced and the moldability is reduced.In the present invention, the aromatic polycarbonate has a viscosity average molecular weight of 20,000 to 25,000. It is necessary to be.

Coated red phosphorus powder in master pellet (B)
Is preferably 10 to 15% by weight. If the amount is less than 10% by weight, the amount of the added master pellets is relatively increased, and if it is more than 15% by weight, it is not preferable because it is difficult to form the master pellets and there is a risk of lowering the safety.

[Aromatic Polycarbonate Resin] In the present invention, the aromatic polycarbonate resin (C) is usually obtained by reacting a dihydric phenol with a carbonate precursor by a solution method or a melting method. As a dihydric phenol, for example,
2,2-bis (4-hydroxyphenyl) propane (hereinafter, referred to as
Bisphenol A), 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfone, etc. Bis (4-hydroxyphenyl) alkane is preferred, and bisphenol A is particularly preferred. Dihydric phenols can be used alone or in combination of two or more. Examples of the carbonate precursor include carbonyl halide, carbonate and haloformate.
Representative examples include phosgene, diphenyl carbonate, dihaloformates of dihydric phenols, and mixtures thereof. In the production of the aromatic polycarbonate, a suitable molecular weight regulator, a branching agent, a catalyst and the like can also be used.

The aromatic polycarbonate resin used in the present invention has a viscosity average molecular weight of 20,000 to 250.
00. If it is smaller than 20,000, the mechanical strength is reduced, and the flame retardancy is reduced.
If it is larger than 000, the fluidity and the like will decrease.

The aromatic polycarbonate resin (C) is blended in an amount of 5 to 150 parts by weight based on 100 parts by weight of the thermoplastic aromatic polyester resin (A).
If the amount is less than 5 parts by weight, the flame retardancy is insufficient, and if it exceeds 150 parts by weight, the mechanical properties of a molded article obtained from the flame retardant resin composition deteriorate.

[Compound] The flame-retardant resin composition of the present invention contains at least one compound (D) selected from the group consisting of titanium oxide, aluminum oxide and molybdenum sulfide. By blending this component (D), sphere-like red phosphorus is remarkably stabilized in the thermoplastic aromatic polyester resin, and the generation amount of phosphine can be greatly reduced. Such effects of stabilizing sphere-like red phosphorus and reducing the amount of phosphine generated can be achieved by blending titanium oxide, aluminum oxide, molybdenum sulfide or copper oxide, but when copper oxide is blended. Reacts with sphere-like red phosphorus to generate phosphoric acid, and thus impairs electrical properties.

The amount of the component (D) used in the present invention is 0.05 to 5 parts by weight of at least one of titanium oxide, aluminum oxide and molybdenum sulfide.
If the amount is less than 0.05 part by weight, the stabilizing effect of red phosphorus is small, and if it is more than 5 parts by weight, the mechanical properties of a molded article obtained from the flame-retardant resin composition are deteriorated.

The component (D) used in the present invention is (A),
When used in combination with components (B) and (C), 1
The amount of phosphine generated after heating at 20 ° C. × 24 hours is 5 × 10 ⁻⁵ g or less per 1 g of red phosphorus contained in the flame-retardant resin composition, and 121 ° C., 100% RH, wet heat of 2.1 atm. A flame-retardant resin composition in which the amount of phosphoric acid generated under the conditions is reduced to 3 × 10 ⁻⁴ g or less per 1 g of red phosphorus contained in the flame-retardant resin composition can be obtained. Since the stability of the sphere-like red phosphorus is increased and the generation of phosphoric acid is not increased, the influence on the electrical properties is extremely small.

The flame-retardant resin composition of the present invention may further contain an inorganic filler as long as the object of the present invention is not impaired.

Examples of such fillers include granular or amorphous fillers such as calcium carbonate, titanium oxide, feldspar minerals, clay, white carbon, carbon black, glass beads, silica, etc .; scaly fillers such as kaolin clay and talc. And fibrous fillers such as glass fiber, urastonite, potassium titanate, aluminum borate, carbon fiber, and aramid fiber. When the inorganic filler is contained, it is preferably contained in the range of 5 to 150 parts by weight based on 100 parts by weight of the thermoplastic aromatic polyester resin (A).

Further, commonly used additives such as antioxidants, heat stabilizers, ultraviolet absorbers, lubricants, nucleating agents, plasticizers, release agents, pigments, impact modifiers such as various elastomers, and polytetrafluorocarbon A flame retardant modifier such as ethylene may be further added.

As a stabilizer for red phosphorus, oxides or hydroxides of zinc, aluminum, magnesium, and titanium can be further added.

The inorganic filler is preferably contained in the range of 5 to 150 parts by weight based on 100 parts by weight of the thermoplastic aromatic polyester resin (A).

The flame-retardant resin composition of the present invention may be produced by simultaneously melting and kneading each component such as polyester resin, sphere-like red phosphorus powder, aromatic polycarbonate master pellets, and glass fibers using an extruder. . Alternatively, either of them may be melt-kneaded in advance.

The resin composition obtained by melt-kneading with an extruder is cut into pellets by a pelletizer and then molded, but the molding method may be any molding method such as injection molding or blow molding.

The composition of the present invention is suitably used for molded parts for electronic and electric applications such as home appliances and OA equipment, and for automotive applications. Specifically, switch parts, motor parts,
It can be used for ignition coil cases, coil bobbins, connectors, relay cases, fuse cases, and the like.

[0053]

The present invention will be described in more detail with reference to the following examples.
Intrinsic viscosity is 35 ° C using orthochlorophenol solvent
Was measured.

As red phosphorus powder, Nova Excel 140 manufactured by Rin Kagaku Kogyo KK was used. The details of this red phosphorus powder are as follows. Red phosphorus powder: coated red phosphorus powder comprising spherical red phosphorus without a crushed surface, which has the following coating and is obtained directly by a yellow phosphorus conversion treatment method that does not require grinding, and has an average particle size of 3
0 μm coated red phosphorus powder. A coating of a cured product of a phenolic resin obtained by suspending sphere-like red phosphorus in water, adding phenol and formalin and heating; a coating of aluminum hydroxide under the coating and in contact with red phosphorus;

The red phosphorus master pellet was prepared as follows. Red phosphorus master pellet: A predetermined amount of an aromatic polycarbonate resin having the viscosity average molecular weight shown in Tables 1 and 2 and the red phosphorus powder obtained by the above method are compounded and melt-kneaded by a short-axis or twin-screw extruder. It was obtained by

Each test was evaluated according to the following methods. Flame retardancy: 0.8 m according to UL94 vertical combustion test method
The flame retardancy was evaluated using a test piece having a thickness of m. Flame retardant is U
According to the evaluation method described in L94, VO, V-1, V-
2. HB was classified into 4 types.

Generated amount of phosphine: 10 g of the pellet produced by the above method is placed in a 500 ml stoppered glass bottle, and a heat treatment is performed at 120 ° C. for 24 hours with the lid closed. After air cooling at room temperature for 5 hours, the phosphine concentration in the glass bottle was measured, and the amount of phosphine generated per gram of red phosphorus was calculated by dividing by the amount of red phosphorus contained in the pellet. The phosphine concentration was measured using a gas detector tube for phosphine manufactured by Gastech.

Generated amount of phosphoric acid: 25 mm × 25 using an injection molding machine (manufactured by FANUC) having a mold clamping force of 15 ton.
A flat plate having a thickness of 1 mm x 1 mm was prepared, and
The wet heat treatment was performed at 200 ° C., 100% RH and 2.1 atm for 200 hours. After cooling at room temperature for 24 hours, 5m
1 l of pure water to elute the precipitates on the surface of the molded product, and measure the concentrations of phosphoric acid and phosphorous acid using an ion chromatograph (DX-100, manufactured by Dionex Co., Ltd.). It was calculated as the amount of phosphoric acid generated per gram of red phosphorus by dividing by the amount of red phosphorus contained.

[Examples 1 to 5 and Comparative Examples 1 to 9] The compositions of Examples 1 to 5 are shown in Table 1, and the compositions of Comparative Examples 1 to 9 are shown in Table 2. The unit of composition in the table is part by weight.

Each of the extruders has a twin screw extruder TEX4.
4 (manufactured by Japan Steel Works, Ltd., screw diameter: 44 mm), and the cylinder temperature was set to Examples 1 to 4 and Comparative Examples 1 to 8.
Is 250 ° C., Example 5 and Comparative Example 9 are 280 ° C., the discharge amount is 50 kg / hr, and the screw rotation speed is 150 rpm.
The mixture was melt-kneaded at pm and pelletized by a cutter. The extrudability in the examples was stable with almost no thread breakage. 13 obtained chips
After drying at 0 ° C. for 5 hours, the melting temperature was 260 ° C. for Examples 1-4 and Comparative Examples 1-8, the mold temperature was 60 ° C., the melting temperature for Example 5 and Comparative Example 9 was 280 ° C., and the mold temperature was A combustion test piece and a flat plate test piece were prepared under the conditions of 60 ° C.

Using these pellets and test pieces, Tables 3 and 4 show the results of a combustion test and evaluation of the amount of phosphine generated and the amount of phosphoric acid generated.

[0062]

[Table 1]

[0063]

[Table 2]

[0064]

[Table 3]

[0065]

[Table 4]

As is clear from Tables 3 and 4, there is no crushed surface directly obtained by a yellow phosphorus conversion treatment method having an aromatic polycarbonate resin having an optimized molecular weight and a cured resin film and requiring no pulverization. High flame retardancy can be obtained by pre-pelletizing coated red phosphorus powder consisting of spherical red phosphorus, and further generation of phosphine while suppressing generation of phosphoric acid by using titanium oxide or aluminum oxide. The amount can be reduced.

[0067]

The flame-retardant resin composition of the present invention is a non-halogen flame-retardant resin composition and uses a master pellet composed of an aromatic polycarbonate resin having optimized molecular weight and spherical red phosphorus. In order to increase the thermal stability of red phosphorus used as a flame retardant due to its high flame retardancy, the crushing obtained directly by the conversion process of yellow phosphorus which has a coating of a cured resin and does not require grinding A coated red phosphorus powder consisting of spherical red phosphorus having no surface is used, and at least one of titanium oxide, aluminum oxide and molybdenum sulfide is used.
The combined use of more than one species can further reduce the amount of phosphine generated, and provide an effect of ensuring excellent workability and safety. In addition, since titanium oxide, aluminum oxide, and molybdenum sulfide do not increase phosphoric acid production, they have a feature that the possibility of adversely affecting electrical characteristics is extremely small.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) C08K 9/04 C08K 9/04 C08L 69/00 C08L 69/00 (72) Inventor Jun Sunohara Onodai, Midori-ku, Chiba-shi, Chiba No. 1-4-13, Teijin Limited Chiba Research Center F-term (reference) 4J002 CF04W CF05W CF06W CF07W CF08W CG01X CG02X CL063 DA018 DA038 DA056 DE137 DE138 DE147 DE188 DE238 DG027 DJ018 DJ038 DJ048 DK008 DL008 FA018 FA043 FD FD FD FB FD FD

Claims (9)

[Claims] 1. A sphere-like red without a crushed surface which is obtained by a conversion process of yellow phosphorus which has a coating of (A) a thermoplastic aromatic polyester resin, (B) a cured resin, and does not require pulverization. Selected from the group consisting of 1 to 15 parts by weight of a coated red phosphorus powder comprising phosphorus, (C) 5 to 150 parts by weight of an aromatic polycarbonate resin having a viscosity average molecular weight of 20,000 to 25,000, and (D) titanium oxide, aluminum oxide and molybdenum sulfide. At least one compound 0.05 to 5
A flame-retardant resin composition consisting of parts by weight, wherein red phosphorus powder (B) and aromatic polycarbonate resin (C) are previously melt-kneaded. 2. The amount of phosphine generated after heating at 120 ° C. for 24 hours is 5 × 10 ⁻⁵ g or less per 1 g of red phosphorus contained, and at 121 ° C., 100% RH and 2.1 atm. The flame-retardant resin composition according to claim 1, wherein the amount of phosphoric acid produced in step (b) is 3 × 10 ⁻⁴ g or less per 1 g of red phosphorus. 3. A thermoplastic aromatic polyester resin (A)
Is a polyester having ethylene terephthalate, trimethylene terephthalate, tetramethylene terephthalate or tetramethylene-2,6-naphthalenedicarboxylate as a main repeating unit. 4. The curable resin film of the coated red phosphorus powder (B) is formed of at least one curable resin selected from the group consisting of a phenol resin, an epoxy resin, an unsaturated polyester resin, a melamine resin, a urea resin and an aniline resin. The flame-retardant resin composition according to claim 1, comprising a cured product of the resin. 5. At least one inorganic compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc hydroxide and hydroxide of titanium is dispersed in the cured resin of the coating of the coated red phosphorus powder (B). The flame-retardant resin composition according to claim 1, which is contained. 6. An undercoating resin of the coating of the coated red phosphorus powder (B) comprising at least one inorganic compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc hydroxide and hydroxide of titanium. The flame-retardant resin composition according to claim 5, wherein the coating is further present in contact with red phosphorus. 7. The coated red phosphorus powder (B) has an average particle size of 5 to 4.
The flame-retardant resin composition according to claim 1, which is in a range of 0 µm. 8. A thermoplastic aromatic polyester resin (A)
The flame-retardant resin composition according to claim 1, further comprising 5 to 150 parts by weight of an inorganic filler based on 100 parts by weight. 9. A flame-retardant resin composition for electric / electronic parts, comprising the flame-retardant resin composition according to claim 2.