JPH10251497A - Flame-retardant resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition which can give a molding which can exhibit high flame retardancy by using a smaller amount of a non-halogen flame retardant and does not drip by mixing a thermoplastic aromatic polyester resin with a novolac phenolic resin and a red phosphorus powder coated with a film of a cured resin. SOLUTION: The thermoplastic aromatic polyester resin used is desirably a polyester or a polyester elastomer comprising ester units being a dicarboxylic acid component mainly consisting of at least one member selected among terephthalic acid, 2,6-naphthalenedicarboxylic acid, etc., and a diol component mainly consisting of at least one member selected among ethylene glycol, tetramethylene glycol, etc. The novolac phenolic resin used has a weight-average molecular weight of 600-13,000. 100 pts.wt. polyester resin is mixed with 3-70 pts.wt. above novolac phenolic resin and 1-15 pts.wt. red phosphor powder coated with a film of a cured resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flame-retardant resin composition. More specifically, it has high flame retardancy, and does not cause dripping of molten resin when burned, and has good mechanical strength and resin kneading processability.
The present invention also relates to a non-halogen flame-retardant resin composition which does not cause bleed-out on the surface of a molded product due to annealing.

[0002]

2. Description of the Related Art Polybutylene terephthalate and other polyester resins have excellent mechanical properties, heat resistance, chemical resistance, etc., and are widely used as molded articles in applications such as electric / electronic fields and automobile fields. I have.

[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 a problem of affecting the environment. Is required.

[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 in the case of a low molecular weight phosphate ester, there are problems of bleed out and heat resistance.

Japanese Patent Application Laid-Open No. Hei 7-126498 discloses that
At least one selected from a polyester resin, an epoxy compound having two or more epoxy groups in the molecule, and a phenol resin and / or a phosphorus, nitrogen, or boron compound having a functional group capable of reacting with the epoxy group; There is disclosed a non-halogen flame retardant for polyester resin, which is obtained by melting and reacting with a non-halogen flame retardant compound.

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 phosphate and phosphite, phenols (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 phenol resin from a thermoplastic resin such as polystyrene or polyester, a phosphorus compound such as a phosphoric acid ester or a phosphite, and a phenol resin from a phenol substituted at the ortho or para position. A flame retardant resin composition is disclosed.

On the other hand, the Journal of Fire Retardant Chemistry (Journal of F)
ire Retardant Chemistry) v
ol. 7, 69-76, 1980 discloses that polystyrene is flame retarded by red phosphorus and a phenolic resin.

Japanese Patent Application Laid-Open No. 2-37370 discloses that
It is difficult to comprise 99 to 34 parts by weight of a thermoplastic polyester resin having a softening point of 150 ° C. or more, such as polyethylene terephthalate, 1 to 25 parts by weight of red phosphorus coated with a thermosetting resin, and 10 to 55 parts by weight of a reinforcing filler. A flammable polyester-based resin composition is disclosed.

[0013]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to
An object of the present invention is to provide a flame-retardant resin composition having a novel composition.

Another object of the present invention is to provide a high flame retardancy with a smaller amount of a non-halogen flame retardant and the drip of a molten resin upon burning. It is an object of the present invention to provide a flame-retardant resin composition which gives a molded article without any problem.

Still another object of the present invention is to provide a flame-retardant polyester resin composition which has good mechanical strength and resin kneading processability and does not cause bleed-out on the surface of a molded product by annealing. .

Still other objects and advantages of the present invention will become apparent from the following description.

[0017]

According to the present invention, the above objects and advantages of the present invention are as follows: (A) 100 parts by weight of a thermoplastic aromatic polyester resin; (B) 3 to 70 parts by weight of a novolak type phenol resin; C) It is achieved by a flame-retardant resin composition comprising 1 to 15 parts by weight of coated red phosphorus powder having a cured resin film.

In the present invention, the thermoplastic aromatic polyester resin (A) is a polyester containing 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. 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 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-naphthalenedicarboxylic 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 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 A polyester or polyester elastomer comprising an ester unit whose component is at least one diol selected from the group consisting of ethylene glycol and tetramethylene glycol is preferred.

Of these, a polyester having tetramethylene terephthalate or tetramethylene-2,6-naphthalenedicarboxylate as a main repeating unit or a polyester elastomer having a main repeating unit of a hard segment is more preferable.

As a soft component of a polyester elastomer having tetramethylene terephthalate or tetramethylene-2,6-naphthalenedicarboxylate as a main repeating unit of a hard segment, for example, dicarboxylic acid may be terephthalic acid, isophthalic acid, sebacic acid and adipic acid. Consisting of one or more dicarboxylic acids selected from the group consisting of: a long-chain diol having 5 to 10 carbon atoms and H (OCH ₂ CH ₂ ) _i OH (i =
Preferred are those composed of one or more diols selected from the group consisting of 2 to 5) and having a melting point of 100 ° C. or less or amorphous polyester or polycaprolactone.

The intrinsic viscosity of the thermoplastic aromatic polyester resin of the present invention measured in orthochlorophenol at 35 ° C. is preferably 0.5 to 1.4, and more preferably 0.6 to 1.2. If the intrinsic viscosity is less than 0.5, the mechanical strength of the obtained composition is lowered, which is not preferable.
If it exceeds 4, the fluidity and the like of the composition obtained are undesirably reduced.

The novolak type phenol resin used in the present invention is obtained by polycondensing phenol and formaldehyde in the presence of an acid catalyst. The weight average molecular weight is preferably from 600 to 13,000, and from 650 to 7.0.
00 is more preferred.

The addition amount of the novolak type phenol resin is 3 to 70 parts by weight based on 100 parts by weight of the thermoplastic aromatic polyester resin (A). When the addition amount is less than 3 parts by weight, the flame retardancy is not sufficient, and when it exceeds 70 parts by weight, the mechanical properties of the molded product are lowered. The preferred addition amount is 5 to 50
Parts by weight.

In the present invention, red phosphorus is used as a coated red phosphorus powder having a cured resin film. Red phosphorus alone is high temperature,
There is a danger of ignition or phosphine generation due to mechanical shock.

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 phenolic resins, epoxy resins, unsaturated polyester resins, melamine resins, urea resins and aniline resins. Things.

In the coated red phosphorus powder, an inorganic compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc hydroxide and a hydroxide of titanium is dispersed and contained in the cured resin of the coating. And a coating of an inorganic compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc hydroxide and a hydroxide of titanium may be further provided in contact with red phosphorus under the coating of the cured resin. it can. The average particle size of the coated red phosphorus powder having the cured resin film is preferably in the range of 5 to 40 μm, and more preferably in the range of 25 to 35 μm.

The coated red phosphorus powder (C) is blended in an amount of 1 to 15 parts by weight based on 100 parts by weight of the aromatic polyester resin (A). If the amount is less than 1 part by weight, the flame retardancy is insufficient. If the amount exceeds 15 parts by weight, the mechanical properties of a molded article obtained from the flame retardant resin composition are undesirably deteriorated.

The coated red phosphorus powder is remarkably improved in safety such as handling as compared with red phosphorus alone, but in order to further enhance safety when used, master pellets previously melt-kneaded with a thermoplastic resin are used. It is preferable to use them. Further, by using the master pellet, a resin composition having excellent mechanical strength of a molded product obtained can be provided.

The thermoplastic resin in this case is not particularly restricted but includes polyethylene, polypropylene, EPDM, ethylene ethyl acrylate, ethylene methyl acrylate, polyester, polyamide, polycarbonate and the like. Usually, a thermoplastic aromatic polyester resin used as the component (A) is desirable.

Coated red phosphorus powder in master pellet (C)
Is preferably 15 to 35% by weight. If the amount is less than 15% by weight, the amount of the added master pellets is relatively increased. If the amount is more than 35% by weight, it is difficult to form the master pellets, and there is a risk that the safety may be reduced.

[0034] The master pellet thus obtained was mixed with 100 parts by weight of the aromatic polyester resin (A).
5 to 70 parts by weight are added. If the amount is less than 5 parts by weight, the desired flame retardancy cannot be obtained, and if it exceeds 70 parts by weight, the inherent properties of the polyester resin are impaired.

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 inorganic fillers include granular or amorphous fillers such as calcium carbonate, titanium oxide, feldspar minerals, clay, white carbon, carbon black, glass beads, etc .; plates such as kaolin clay, talc, etc. Fillers such as glass flakes, mica, graphite and the like; and fibrous fillers such as glass fibers, urastonite and potassium titanate.

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

Further, the flame-retardant resin composition of the present invention may contain a fluororesin. Examples of the fluorine resin include polytetrafluoroethylene and tetrafluoroethylene / ethylene copolymer. The preferable addition amount of the fluororesin is 0.01 to 10 parts by weight based on 100 parts by weight of the aromatic polyester resin (A). If it exceeds 10 parts by weight, it is not preferable from the viewpoint of moldability. By adding the fluororesin, the burning time of the resin composition can be reduced.

Further, the flame-retardant resin composition of the present invention may contain a silicone powder. Silicone powder has a structure in which silane and silicone are supported on silica. The preferable addition amount of the silicone powder is 0.01 to 10 parts by weight based on 100 parts by weight of the aromatic polyester resin (A). If the amount exceeds 10 parts by weight, it is not preferable from the viewpoint of moldability.

The flame-retardant resin composition of the present invention may further comprise an antioxidant, a heat stabilizer, an ultraviolet absorber, a lubricant, a nucleating agent, a plasticizer, a release agent, a pigment, and an impact modifier such as various elastomers. Can be further contained.

The method for producing the flame-retardant resin composition of the present invention is as follows: components such as polyester resin, coated red phosphorus powder or red phosphorus master pellet, novolak type phenol resin, and glass fiber are simultaneously melt-kneaded using an extruder. Method. 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. The molding method may be any molding method such as injection molding or blow molding.

The flame-retardant resin composition of the present invention can be used for home appliances, OA
It is suitably used for injection molded products such as electronic and electric parts such as equipment. Specifically, it can be used for a switch component, a motor component, an ignition coil case, a coil bobbin, a connector, a relay case, a fuse case, and the like.

Hereinafter, the present invention will be described in more detail with reference to examples. In the examples, “parts” indicates “parts by weight”. Intrinsic viscosity was measured at 35 ° C. using an orthochlorophenol solvent. Each test was evaluated according to the following method.

Flame retardancy: 1/94 according to UL94V test method
Flame retardancy was evaluated using test pieces having a thickness of 8 inches, 1/16, and 1/32. Flame retardancy was classified into four types of V-0, V-1, V-2 and HB according to the evaluation method described in UL94. It should be noted that, in addition to this determination method, data of dropping are also described. As for the effects of the fluororesin and the silicone powder, the average burning time per operation is described.

Oxygen index (O.I.): based on JIS K7201. Flexural strength: based on ASTM-D790. Deflection load temperature: based on ASTM-D648-56. Bleed-out property: 150 ° C x 72 using a combustion test piece
After the time annealing treatment, the molded product surface was visually evaluated by X when the powder or liquid oozed out, and by O when there was no oozing. Evaluation of kneading processability: x when there was blocking under the hopper, and o when there was no blocking.

[0047]

Examples 1 to 11 and Comparative Examples 1 to 11 Examples 1 to 1
Table 1 shows the composition of Comparative Example No. 1 and Table 2 shows the compositions of Comparative Examples 1 to 11. The red phosphorus master pellets used were prepared by melt-kneading 30% by weight of red phosphorus coated with a phenol resin and 70% by weight of a polybutylene terephthalate resin. In each case, a twin-screw extruder [TEX4
4, manufactured by Japan Steel Works, Ltd.], the cylinder temperature was 260 ° C. in Examples 1 to 9 and Comparative Examples 1 to 9, and Example 10
And Comparative Example 10 was 230 ° C., Example 11 and Comparative Example 11
The melt kneading was performed at 270 ° C., the discharge rate was 40 kg / hr, and the number of rotations was 150 rpm, and chips were formed by a cutter. The extrudability in the examples was stable with almost no thread breakage.

After the obtained chips were dried at 120 ° C. for 5 hours, the melting temperature was set to 260 in Examples 1 to 9 and Comparative Examples 1 to 9.
° C, the mold temperature is 60 ° C, the melting temperature of Example 10 and Comparative Example 10 is 230 ° C, the mold temperature is 80 ° C, the temperature of Example 11 and Comparative Example 11 is 270 ° C, and the mold temperature is 80 ° C. Then, a combustion test piece, a tensile test piece, and a bending test piece were prepared.

Using these test pieces, a combustion test (UL
1/8, 1/16 inch for 94V glass non-strengthened system, 1/8, 1/16, 1/32 inch for glass strengthened system, and oxygen index), tensile test, bending test, weight deflection temperature test,
Tables 3, 4 and 5 show the results of the bleed-out test by annealing and the results of the kneading processability.

The method for producing coated red phosphorus having a surface coated thereon is as follows. Red phosphorus is suspended in water, an aqueous solution of aluminum sulfate is added, an aqueous solution of sodium hydroxide is added dropwise with sufficient stirring, and the mixture is heated to 50 ° C. for 30 minutes. After holding, phenol and formalin were added, and the mixture was heated to 80 ° C., phosphoric acid was added with stirring, and the mixture was heated and stirred at the same temperature for 1 hour, allowed to cool, filtered, washed with water and dried, and used.

[0051]

[Table 1]

[0052]

[Table 2]

[0053]

[Table 3]

[0054]

[Table 4]

[0055]

[Table 5]

In Example 1, 13 parts by weight of red phosphorus master pellets (hereinafter, referred to as red phosphorus master) and 20 parts by weight of uncured phenol resin (hereinafter, simply referred to as phenol resin) were blended with 100 parts by weight of PBT resin. Example 2
Is a blend of 100 parts by weight of PBT resin and 20 parts by weight of a red phosphorus master and 20 parts by weight of a phenol resin.
It showed V-0 in the combustion test of UL-94, was excellent in mechanical properties, and showed no bleed-out.

On the other hand, in Comparative Example 1, 100 parts by weight of the PBT resin was mixed with 2 parts by weight of the red phosphorus master and 2 parts by weight of the phenol resin. Flammability could not be obtained. Comparative Example 2 was composed of 100 parts by weight of the PBT resin, 13 parts by weight of the red phosphorus master, and 2 parts by weight of the phenol resin. Since the amount of the phenol resin was not appropriate, sufficient flame retardancy was not obtained.

In Comparative Example 3, 20 parts by weight of a phosphate ester and 20 parts by weight of a phenol resin were used in place of a red phosphorus master as a phosphorus-based flame retardant in 100 parts by weight of a PBT resin. 1/16 inch is not sufficient flame retardancy, but when using a phosphate ester, bleeding out during annealing is severe and white powder adheres to the surface of the molded product did.

In Comparative Example 4, 13 parts by weight of the red phosphorus master and 20 parts by weight of melamine cyanurate were mixed with 100 parts by weight of the PBT resin in place of the phenol resin. However, when melamine cyanurate was used, the problem of non-dropping was solved. Not 1
Sufficient flame retardancy was not obtained for both / 8 inch and 1/16 inch.

In Comparative Example 5, 13 parts by weight of the red phosphorus master and 20 parts by weight of diallyl phthalate were added to 100 parts by weight of the PBT resin in place of the phenol resin, but they did not have the flame retardant effect. From the results of Comparative Examples 2 and 3 and Comparative Examples 3 to 5, it was confirmed that specifically high flame retardancy was obtained when a specific amount of the red phosphorus master and the phenol resin were used in combination.

In Example 3, 100 parts by weight of PBT resin, 60 parts by weight of glass fiber, 10 parts by weight of red phosphorus master,
By blending 10 parts by weight of a phenol resin, a flame retardancy of V-0 was obtained up to a thickness of 1/32 inch. In addition, it had high mechanical properties, had no bleed-out, and was effective in blocking.

Similarly, in Example 4, 100 parts by weight of the PBT resin was mixed with 60 parts by weight of glass fiber, 20 parts by weight of a red phosphorus master, and 20 parts by weight of a phenol resin. It had good bleed-out and blocking properties. In Example 5, 100 parts by weight of PBT resin, 60 parts by weight of glass fiber, 20 parts by weight of red phosphorus master, and 40 parts by weight of phenol resin were blended.
As in the case of No. 4, high flame retardancy and good bleed-out and blocking properties were obtained.

In Example 6, 100 parts by weight of PBT resin was mixed with 60 parts by weight of glass fiber, 65 parts by weight of red phosphorus master and 20 parts by weight of phenol resin, and the same results as in Examples 3, 4 and 5 were obtained. .

On the other hand, in Comparative Example 6, 60 parts by weight of the glass fiber and 20 parts by weight of the red phosphorus master were blended with 100 parts by weight of the PBT resin, and no phenol resin was blended. As a result, only low flame retardancy was obtained. In Comparative Example 7, the PBT resin 10
The amount of the red phosphorus master was increased to 60 parts by weight with respect to 0 parts by weight and 60 parts by weight of the glass fiber. However, as in Comparative Example 6, only low flame retardancy was obtained. The thermosetting phenolic resin used as the agent cannot impart sufficient flame retardancy to the PBT resin, and the flame retardant of V-0 is first obtained when the uncured phenolic resin is added during extrusion kneading. It was found that the effect appeared.

In Comparative Example 8, 20 parts by weight of a phosphate ester and 20 parts by weight of a phenol resin were used in place of the red phosphorus master with respect to 100 parts by weight of the PBT resin and 60 parts by weight of the glass fiber. Bleed-out was observed on the surface of the molded product after annealing, and blocking occurred at the upper portion of the material input port of the screw during extrusion.

In Comparative Example 9, 20 parts by weight of a phosphoric ester and 20 parts by weight of a phenol resin were further added to 1 part by weight of an epoxy compound based on 100 parts by weight of a PBT resin and 60 parts by weight of glass fiber in Comparative Example 8. Bleed-out could not be suppressed.

In Example 9, 100 parts by weight of PBT resin was mixed with 60 parts by weight of glass fiber, 3 parts by weight of red phosphorus powder, and 20 parts by weight of phenol resin. Although it was good, it is a dangerous substance in the state of red phosphorus powder,
There is a possibility that a problem may occur in the ignitability with respect to the impact.

Example 10 shows polyester elastomer 1
When 13 parts by weight of the red phosphorus master and 20 parts by weight of the phenol resin were added to 00 parts by weight, all of the flame retardancy, bleed out property and blocking property were good.

On the other hand, in Comparative Example 10, 20 parts by weight of the phosphoric ester and 20 parts by weight of the phenol resin were blended with 100 parts by weight of the polyester elastomer, but when the thickness was reduced, the flame retardancy was insufficient, and the bleed out property and the blocking property were also deteriorated. It was bad.

In Example 11, 100 parts by weight of PET resin and 60 parts by weight of glass fiber were mixed with 20 parts by weight of a red phosphorus master and 20 parts by weight of a phenol resin. On the other hand, Comparative Example 11
Was mixed with 100 parts by weight of PET fiber and 60 parts by weight of glass fiber with 20 parts by weight of a phosphoric ester and 20 parts by weight of a phenol resin. Example 11 has a V-
A high flame retardancy of 0 was obtained, and the mechanical properties, bleed-out properties, and blocking properties were also good. On the other hand, Comparative Example 11
As the thickness became smaller, the flame retardancy decreased, and the mechanical properties, bleed-out properties, and blocking properties were inferior to those of Example 11.

In Example 7, 100 parts by weight of PBT resin, 60 parts by weight of glass fiber, 20 parts by weight of red phosphorus master and 20 parts by weight of phenol resin were further added with 1 part by weight of fluororesin. Time is short,
It was confirmed that the flame retardancy was improved.

In Example 8, 100 parts by weight of PBT resin, 60 parts by weight of glass fiber, 20 parts by weight of red phosphorus master and 20 parts by weight of phenol resin were further added with 2 parts by weight of silicone powder. It was confirmed that the time was shortened and the flame retardancy was improved.

[0073]

The flame-retardant resin composition of the present invention is a non-halogen flame-retardant resin composition, and it is difficult to improve the flame retardancy of polytetramethylene terephthalate by using red phosphorus powder alone. On the other hand, the combined use of coated red phosphorus powder and master pellets containing red phosphorus coated on the surface and a novolak type phenol resin for the first time has the effect of suppressing dripping during combustion and significantly shortening the combustion time. There is. Combined use of novolak type phenolic resin with red phosphorus is characterized by its specific improvement in flame retardancy, and nitrogen-containing melamine cyanurate, which has often been used as an auxiliary agent, and thermosetting type Preferred results are not obtained with the type diallyl phthalate. In addition, the present invention has a high level of flame retardancy with a small amount of flame retardant, has good mechanical properties and resin kneading processability, and can be applied to the surface of a molded product by annealing treatment which becomes a problem when using a phosphate ester. Since there is no bleed-out problem, its industrial value is extremely large.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // (C08L 67/02 61:06 27:12)

Claims (10)

[Claims] (1) 100 parts by weight of a thermoplastic aromatic polyester resin, (B) 3 to 70 parts by weight of a novolak type phenol resin, and (C) 1 to 15 parts by weight of a coated red phosphorus powder having a cured resin film. Flame retardant resin composition. 2. A thermoplastic aromatic polyester resin (A)
Is mainly composed of terephthalic acid and 2,6
A polyester or polyester elastomer comprising an ester unit which is at least one dicarboxylic acid selected from the group consisting of naphthalenedicarboxylic acids and whose main diol component is at least one diol selected from the group consisting of ethylene glycol and tetramethylene glycol The composition according to claim 1, which is: 3. A thermoplastic aromatic polyester resin (A)
Is a polyester having tetramethylene terephthalate or tetramethylene-2,6-naphthalenedicarboxylate as a main repeating unit or a polyester elastomer having a hard repeating unit as a main repeating unit. 4. The composition according to claim 1, wherein the novolak-type phenol resin (B) has a weight average molecular weight in the range of 600 to 13,000. 5. A cured product 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, wherein the cured resin of the coating of the coated red phosphorus powder is The composition according to claim 1, comprising: 6. An inorganic compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc hydroxide and a hydroxide of titanium is dispersedly contained in the cured resin of the coating of the coated red phosphorus powder. A composition according to claim 1. 7. A coating of an inorganic compound selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc hydroxide and a hydroxide of titanium is further present under the coating of the cured resin in contact with red phosphorus. Item 10. The composition according to Item 1. 8. The composition according to claim 1, wherein the average particle size of the coated red phosphorus powder having a cured resin film is in the range of 5 to 40 μm. 9. The composition according to claim 1, further comprising an inorganic filler in a range of 5 to 150 parts by weight. 10. The composition according to claim 1, further comprising a fluororesin in a range of 0.01 to 10 parts by weight.