JPH08225728A - Flame-retardant polyester-based resin composition - Google Patents

Abstract

PURPOSE: To obtain the subject composition useful as a material for functional parts, having excellent flame retardance, molding fluidity, mechanical strength, mold release characteristics and high-cycle moldability by blending a specific polyester with a phenoxy resin, an Sb compound, a carbodiimide, silicic acid (salt) and a filler. CONSTITUTION: This composition is obtained by blending (A) 100 pts.wt. of a polyethylene terephthalate-based thermoplastic polyester consisting essentially of an ethylene terephthalate unit with (B) 1-50 pts.wt. of a high-molecular weight phenoxy resin of the formula ((n) is an average polymerization degree and is >=12), (C) 0.1-15 pts.wt. of an Sb compound such as antimony oxide or sodium antimonate) (D) 0.05-12 pts.wt. of an aromatic polycarbodiimide, (E) 0.1-60 pts.wt. of silicic acid (salt) compound (e.g. talc, mica, kaolin or wallastonite) and (F) 0-150 pts.wt. of a reinforcing filler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant polyester resin composition, and more specifically, it has excellent flame retardancy even in a thin-walled molded product, and has excellent mechanical strength such as molding fluidity and bending strength. Further, the present invention relates to a flame-retardant polyethylene terephthalate-based resin composition having excellent mold releasability when molding by injection molding or the like and capable of achieving high molding cycle.

[0002]

2. Description of the Related Art Polyethylene terephthalate has been widely used as a fiber, a film, a molding material, etc. since it has excellent mechanical properties and electrical properties. In particular, since the mechanical strength and the thermal characteristics are significantly improved by blending a fiber reinforcing material such as glass fiber, the reinforcing composition thus obtained is suitable as a material for so-called functional parts.

In recent years, especially in the field of electric or electronic parts, the demand for safety against fire has increased, and flame retardation of resins has been performed. For example, organic halogen compounds or polymeric halogen compounds have been added. Regarding flame retardancy of thermoplastic polyesters, for example, JP-A-50-3525.
7, JP-A-62-15256, a method of adding a halogenated bisphenol A type epoxy resin, JP-A-59-1
49954 has high molecular weight halogenated bisphenol A
Method of adding type phenoxy resin, JP-A-50-923
46, a method of adding a halogenated polystyrene resin is proposed. Electric or electronic parts in which such a flame-retardant material is used generally have a mixture of relatively thin parts to thick parts. It is necessary to have a material having molding fluidity for obtaining the above-mentioned properties and having a good mold releasability even in a thick portion. In addition, good mold releasability is also required to meet the demand for high cycle molding to improve productivity.

[0004]

However, when a halogenated bisphenol A type epoxy resin is used as the flame retardant, since the flame retardant has a low molecular weight, bleeding occurs on the surface of the molded product, resulting in surface characteristics and appearance. And the molding processing temperature of polyethylene terephthalate is generally 250 to 290 ° C., which is a relatively high temperature.
There is a problem that the reaction of the epoxy group of the flame retardant proceeds excessively to increase the melt viscosity and the fluidity at the time of molding is lowered, and further, the flame retardancy in a thin molded product is insufficient.

On the other hand, when a high molecular weight halogenated bisphenol A type phenoxy resin or halogenated polystyrene resin is added as compared with the halogenated bisphenol A type epoxy resin, the problem of bleeding is improved, but these problems are difficult. Since the flammable agent has a high molecular weight, it has poor fluidity, so the dispersibility in the resin is also poor, and on the contrary, the mechanical properties deteriorate, the appearance of the molded article deteriorates, and the flame retardancy in a thin molded article is insufficient. There's a problem. In order to solve such problems, JP-A-61-261346 discloses a method of adding a halogenated phenoxy resin and a polyfunctional epoxy compound,
Japanese Patent Application Laid-Open No. 57-55957 proposes a method of adding a halogenated polystyrene resin and a specific polyfunctional epoxy compound. In such a method, the polyfunctional epoxy compound causes a crosslinking reaction or the like during heating and melting, There are new problems such as a decrease in fluidity due to an increase in melt viscosity and a gelling which prevents formation of a good molded product. Therefore, in these methods, defective molding due to unfilling or the like in the thin portion and deterioration of mechanical strength may occur.
From such a problem, in the flame-retardant polyester, a material which is capable of maintaining sufficient flame retardancy even in a thin-walled molded product and which is excellent in molding fluidity and mechanical strength is desired.

[0006] As a result of intensive investigations by the present inventors with respect to such problems, an antimony compound selected from the group consisting of antimony oxide and sodium antimonate, and a high molecular weight tetrabromobisphenol A phenoxy resin and an aromatic poly It was found that the addition of carbodiimide can improve the effect. However, the flame-retardant polyethylene terephthalate-based resin composition obtained by such a method has insufficient mold releasability, especially in a thick portion, when molding a molded article by injection molding or the like. It was found to be insufficient for the high cycle demand of.

[0007]

Means for Solving the Problems The present inventors have improved the above-mentioned problems and have high flame retardancy even in a thin-walled molded product, good molding fluidity and mechanical strength, and further mold releasability. As a result of earnestly studying a flame-retardant polyethylene terephthalate-based resin composition having good and capable of high cycle molding,
By adding together an antimony compound selected from the group consisting of antimony oxide and sodium antimonate, an aromatic polycarbodiimide and an inorganic compound selected from the group consisting of silicic acid compounds and silicic acid to a high molecular weight tetrabromobisphenol A-type phenoxy resin, The inventors have found that the above objects can be achieved and have reached the present invention.

That is, the present invention relates to (A) 100 parts by weight of a polyethylene terephthalate-based thermoplastic polyester having an ethylene terephthalate unit as a main constituent,
(B) The following general formula (I)

[0009]

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At least one selected from the group consisting of 1 to 50 parts by weight of a high molecular weight tetrabromobisphenol A-type phenoxy resin represented by (n is an average degree of polymerization of 12 or more), (C) antimony oxide and sodium antimonate. 0.1 to 15 parts by weight of one antimony compound,
(D) 0.05 to 12 parts by weight of aromatic polycarbodiimide, and (E) 0.1 to 60 parts by weight of at least one inorganic compound selected from the group consisting of silicate compounds and silicic acid, and (F) reinforcing filling. The content of the flame-retardant polyethylene terephthalate resin composition is 0 to 0 parts by weight of the material.

The thermoplastic polyester (A) used in the present invention uses terephthalic acid or a derivative thereof having an ester forming ability as an acid component, and a glycol having 2 to 10 carbon atoms or a derivative thereof having an ester forming ability as a glycol component. Is a polyester resin obtained by using
Specific examples thereof include polyethylene terephthalate, polypropylene terephthalate, polytetramethylene terephthalate, polyhexamethylene terephthalate, etc. These may be used alone or in combination of two or more.

Further, as the thermoplastic polyester, a copolymerizable component can be used as long as the flame retardancy, moldability and mechanical properties of the flame retardant polyester resin composition are not impaired. Examples of the component include divalent or higher aromatic carboxylic acids having 8 to 22 carbon atoms, divalent or higher aliphatic carboxylic acids having 4 to 12 carbon atoms, and further divalent or higher alicyclic carboxylic acids having 8 to 15 carbon atoms. Carboxylic acids such as acids and ester-forming derivatives thereof, aliphatic compounds having 3 to 15 carbon atoms, and 6 to 6 carbon atoms
Examples thereof include alicyclic compounds having 20 groups, compounds having a hydroxyl group such as aromatic compounds having 6 to 40 carbon atoms, and ester-forming derivatives thereof.

Specifically, as carboxylic acids, other than terephthalic acid, for example, isophthalic acid, naphthalenedicarboxylic acid, bis (p-carboxyphenyl) methaneanthracene dicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 1,2 -Bis (phenoxy) ethane-4,4'-
Dicarboxylic acid, adipic acid, sebacic acid, azelaic acid, dodecanedioic acid, maleic acid, trimesic acid, trimellitic acid, pyromellitic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, decahydronaphthalenedicarboxylic acid Carboxylic acids such as acids or derivatives thereof having the ability to form an ester,
Examples of the hydroxyl group-containing compounds include ethylene glycol, propylene glycol, butanediol, hexanediol, decanediol, neopentyl glycol,
Cyclohexanedimethanol, cyclohexanediol, 2,2'-bis (4-hydroxyphenyl) propane, 2,2'-bis (4-hydroxycyclohexyl)
Examples thereof include compounds such as propane, hydroquinone, glycerin, and pentaerythritol, or derivatives thereof having ester-forming ability. In addition, p-oxybenzoic acid, p-
Oxyacids such as hydroxyethoxybenzoic acid and their ester-forming derivatives, cyclic esters such as ε-caprolactone and the like can also be used. Further, polyethylene glycol, polypropylene glycol, poly (ethylene oxide / propylene oxide) block and / or random copolymer, ethylene oxide addition polymer of bisphenol (A), propylene oxide addition polymer thereof, tetrahydrofuran addition polymer thereof, polytetra It is also possible to use a polymer chain in which a polyalkylene glycol unit such as methylene glycol is partially copolymerized. The copolymerization amount of the above components is about 20% by weight, preferably 15% by weight or less, more preferably 10% by weight or less.
% By weight or less.

Intrinsic viscosity of the thermoplastic polyester [phenol: 1,1,2,2-tetrachloroethane = 1: 1
(Weight ratio) Measured at 25 ° C. using mixed solvent] is 0.
It is 35 or more, preferably 0.4 to 1.20, and more preferably 0.5 to 0.95. If it is less than 0.35, the mechanical strength of the flame-retardant resin composition is insufficient, and
When it exceeds 20, the moldability is deteriorated, which is not preferable. The thermoplastic polyesters may be used alone or in combination of two or more having different compositions or copolymerization components and / or having different intrinsic viscosities.

In the present invention, the specific (B) high molecular weight tetrabromobisphenol A type phenoxy resin is used for the purpose of imparting flame retardancy. The tetrabromobisphenol A type epoxy resin has the general formula (I)

[0016]

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(N is an average degree of polymerization of 12 or more). The average degree of polymerization n is 12 or more, more preferably 15 or more. If n is less than 12, problems such as reduced flame retardancy in thin-walled molded products occur.

The tetrabromobisphenol A type phenoxy resin may be used in an amount sufficient to make the above thermoplastic polyester flame-retardant.
The amount is 1 to 50 parts by weight, preferably 5 to 45 parts by weight, and more preferably 10 to 35 parts by weight. If it is less than 1 part by weight, the flame retardancy is insufficient, and if it exceeds 50 parts by weight, the moldability and mechanical strength of the flame retardant polyester resin composition are deteriorated.

In the composition of the present invention, one or more antimony compounds selected from the group consisting of (C) antimony oxide and sodium antimonate are used for the purpose of improving flame retardancy and molding fluidity. Among the antimony compounds, examples of antimony oxide include antimony trioxide, antimony tetraoxide, antimony pentoxide, and the like, and antimony trioxide is particularly preferable.

The antimony compound may be used alone or in combination of two or more, and the amount thereof is 0.1 to 15 parts by weight, preferably 1 to 12 parts by weight, based on 100 parts by weight of the thermoplastic polyester. . If it is less than 0.1 part by weight, flame retardancy and molding fluidity are insufficient, and if it exceeds 15 parts by weight, the mechanical strength of the flame retardant polyester resin composition is lowered.

The present invention further comprises (D) an aromatic polycarbodiimide. Polycarbodiimide is a compound having at least two carbodiimide groups represented by (-N = C = N-) in the molecule. For example, by heating an organic isocyanate in the presence of a suitable catalyst, a decarboxylation reaction is performed. Can be manufactured. Examples of aromatic polycarbodiimides include aromatic dicarbodiimide compounds such as p-phenylene-bis-o-triylcarbodiimide, p-phenylene-bis-p-chlorophenylcarbodiimide, ethylene-bis-diphenylcarbodiimide, poly (4 , 4 '
-Methylenebiscyclohexylcarbodiimide), poly (4,4'-diphenylmethanecarbodiimide), poly (3,3'-dimethyl-4,4'-diphenylmethanecarbodiimide), poly (naphthylenecarbodiimide),
Poly (p-phenylenecarbodiimide), poly (m-phenylenecarbodiimide), poly (tolylcarbodiimide), poly (diisopropylphenylenecarbodiimide), poly (methyl-diisopropylphenylenecarbodiimide), poly (triethylphenylenecarbodiimide), poly (triisopropylphenylene) Carbodiimide) and other aromatic polycarbodiimides and the like,
As a commercially available product, there is Starvacol P (registered trademark) manufactured by Bayer. The carbodiimide compounds may be used alone or in combination of two or more.

The amount of the aromatic polycarbodiimide used is 0.0 based on 100 parts by weight of the thermoplastic polyester.
It is 5 to 12 parts by weight, preferably 0.1 to 10 parts by weight, and more preferably 0.4 to 8 parts by weight. Usage is 0.0
If the amount is less than 5 parts by weight, the effect on the molding fluidity and the like is small, and the appearance of the molded body is deteriorated. Strength is reduced.

Further, in the present invention, by using at least one inorganic compound selected from the group consisting of (E) a silicate compound and silicic acid, the molding fluidity and the mold release can be sufficiently satisfied with respect to the requirement of molding high cycle. It is possible to impart sex. Among the inorganic compounds, the silicate compound is a compound having a chemical composition including a SiO ₂ unit and having a shape such as powder, granules, needles and plates, and examples thereof include magnesium silicate and aluminum silicate. Examples thereof include calcium silicate, talc, mica, wollastonite, kaolin, diatomaceous earth, bentonite and clay. Among such inorganic compounds, talc, mica, kaolin, and wollastonite are particularly preferable.

These inorganic compounds can be used alone or in combination of two or more, and the amount thereof is 0.1 to 60 parts by weight, preferably 1 to 45 parts by weight based on 100 parts by weight of the polyethylene terephthalate thermoplastic polyester. Parts by weight,
More preferably, it is 3 to 30 parts by weight. Usage is 0.
If it is less than 1 part by weight, the effect on the molding fluidity and releasability becomes small, and if it exceeds 60 parts by weight, the mechanical strength of the flame-retardant resin composition decreases.

The flame-retardant polyethylene terephthalate resin composition of the present invention includes, in addition to the above components, a composition containing (F) a reinforcing filler, that is, a reinforced flame-retardant polyester composition. Therefore, known and conventional ones can be used as they are. Examples of the reinforcing filler include glass fiber, carbon fiber, potassium titanate fiber, glass beads, glass flakes, calcium carbonate, calcium sulfate, barium sulfate and the like. As the reinforcing filler, fibrous reinforcing agents such as glass fibers and carbon fibers are preferable, and from the viewpoint of workability, it is preferable to use chopped strand glass fibers treated with a sizing agent. Further, in order to enhance the adhesiveness between the resin and the fibrous reinforcing agent, it is preferable that the surface of the fibrous reinforcing agent is treated with a coupling agent, and a binder may be used.

Examples of the coupling agent include γ-
Alkoxysilane compounds such as aminopropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane, and as the binder, for example, epoxy resin,
Urethane resins and the like are preferably used, but not limited thereto. These coupling agents and binders may be used alone or in combination of two or more.

When glass fiber is used as the reinforcing filler,
The diameter is preferably 1 to 20 μm and the length is preferably 0.01 to 50 mm. If the fiber length is too short, the reinforcing effect is not sufficient, and conversely, if the fiber length is too long, extrusion processability, molding processability, surface property of the molded product, etc. are deteriorated, which is not preferable.

The reinforcing filler can be used alone or in combination of two or more kinds. The amount of such reinforcing filler used is up to 150 parts by weight, preferably 120 parts by weight, per 100 parts by weight of the polyethylene terephthalate thermoplastic polyester.
It is up to 1 part by weight, more preferably 2 to 100 parts by weight. If the amount of the reinforcing filler used exceeds 150 parts by weight, extrusion processability and molding processability deteriorate.

If desired, a heat stabilizer such as an antioxidant may be used in the flame-retardant polyester resin composition of the present invention. As the stabilizer, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-
4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-
2,4,6-Tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, n-octadecyl-3-
(3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate, N, N'-bis-3- (3',
5'-di-t-butyl-4-hydroxyphenyl) propionylhexamethylenediamine, tris- (3,5-
Di-t-butyl-4-hydroxybenzyl) isocyanurate and other phenolic antioxidants, tris (2,4-
Di-t-butylphenyl) phosphite, distearyl pentaerythritol diphosphite, bis (2,6-
Phosphorus antioxidants such as di-t-butyl-4-methylphenyl) pentaerythritol-di-phosphite, distearyl-3,3'-thiodipropionate, pentaerythritol-tetrakis- (β-lauryl-thio) Examples thereof include thioether type antioxidants such as propionate), and these are used alone or in combination of two or more kinds.

The flame-retardant polyester resin composition of the present invention further comprises an ultraviolet absorber, a light stabilizer, a lubricant, a release agent, a plasticizer, a nucleating agent, a crystallization accelerator, a pigment, a dye and an antistatic agent. ,
Additives such as a dispersant, a compatibilizer, and an antibacterial agent can be used alone or in combination of two or more kinds. Further, other flame retardants and flame retardant aids may be used in combination.

The flame-retardant polyethylene terephthalate resin composition of the present invention contains any other thermoplastic or thermosetting resin as long as it does not impair the properties such as flame retardancy, mechanical properties and moldability. , For example, saturated or unsaturated polyester resin other than polyethylene terephthalate resin, liquid crystal polyester resin, polyester ester elastomer resin, polyester ether elastomer resin, polyolefin resin, polyamide resin,
A polycarbonate resin, a rubbery polymer reinforced styrene resin, a polyphenylene sulfide resin, a polyphenylene ether resin, a polyacetal resin, a polysulfone resin, a polyarylate resin or the like may be added alone or in combination of two or more.

The flame-retardant polyethylene terephthalate resin composition of the present invention contains any other thermoplastic or thermosetting resin as long as it does not impair the properties such as flame retardancy, mechanical properties and moldability. , For example, saturated or unsaturated polyester resin other than polyethylene terephthalate resin, liquid crystal polyester resin, polyester ester elastomer resin, polyester ether elastomer resin, polyolefin resin, polyamide resin,
A polycarbonate resin, a rubbery polymer reinforced styrene resin, a polyphenylene sulfide resin, a polyphenylene ether resin, a polyacetal resin, a polysulfone resin, a polyarylate resin or the like may be added alone or in combination of two or more.

The method for producing the flame-retardant polyester resin composition of the present invention is not particularly limited. For example, after the components listed above are uniformly mixed in advance, they are fed to a single-screw or multi-screw extruder, melt-mixed at 200 to 300 ° C., and then cooled to produce pellets.

The method for molding the flame-retardant polyethylene terephthalate resin composition of the present invention is not particularly limited, and molding methods generally used for thermoplastic resins, that is, injection molding, blow molding, extrusion molding, Various molding methods such as sheet molding, roll molding, press molding, laminated molding, film molding by melt casting method, and spinning can be applied.

[0035]

EXAMPLES The present invention will now be described in detail with reference to examples, but the present invention is not limited thereto. In the following description, "parts" means "parts by weight" and "%" means "% by weight" unless otherwise specified. The resin composition was evaluated by the following methods.

Evaluation Method Using the obtained pellet-shaped resin composition, JIS K-
According to 7210, the method B flow was measured at a cavity set temperature of 280 ° C. and a preheating time of 5 minutes to evaluate the fluidity.

After drying the obtained resin composition at 140 ° C. for 4 hours or more, injection molding was performed at a cylinder temperature of 270 ° C. and a mold temperature of 120 ° C. using a 50t injection molding machine.
Bars having a thickness of 1/16 inch and a 1/32 inch (both having a width of 12 mm and a length of 127 mm) were obtained and evaluated as follows. Flame retardancy: Using 1/16 inch bar and 1/32 inch bar, flame retardancy was evaluated according to the vertical combustion test method described in UL94. Bending strength: A 1/4 bar was subjected to a bending test according to ASTM D-790 to obtain the maximum strength.

Mold releasability: The obtained resin composition was dried at 140 ° C. for 4 hours or more, and then, using a 50t injection molding machine, the cylinder temperature was 300 ° C. and the mold temperature was 140 ° C.
When a 4-inch (width 12 mm, length 127 mm) bar is injection-molded, the minimum cooling time "limit cooling time" is obtained to obtain a good molded product without dents or deformation due to the protruding pin, and to check the mold releasability. evaluated.

Example 1 100 parts by weight of polyethylene terephthalate (intrinsic viscosity 0.6: manufactured by Kanebo Co., Ltd.) had an average degree of polymerization of about 52.
23 parts of tetrabromobisphenol A type phenoxy resin (1), 5 parts of antimony trioxide (antimony oxide C: product name of Sumitomo Metal Mining Co., Ltd.), aromatic polycarbodiimide (Stabaxol P: product name of Bayer Co., Ltd.) ), Talc containing 4 parts of SiO ₂ and about 63% of SiO ₂ (Microace K-1: trade name of Nippon Talc Co., Ltd.), phenolic antioxidant (Adeka Stab AO-6).
0: Asahi Denka Co., Ltd. (trade name) 0.35 parts was previously dry blended, and then a vented twin-screw extruder (TEX44: Japan Steel Works Co., Ltd.) hopper with a cylinder temperature set at 260 ° C. While supplying, 50 parts of glass fiber (T-195H / PS: trade name of Nippon Electric Glass Co., Ltd.) is added midway and melt-extruded,
A resin composition was obtained. Table 1 shows the evaluation results of the resin composition.

Example 2 5 parts of antimony trioxide was changed to 10 parts of sodium antimonate (San Epoch NA-1070L: trade name of Nissan Kagaku Co., Ltd.), 4 parts of aromatic polycarbodiimide was changed to 1 part, and thioether-based oxidation was carried out. Inhibitor (Adeka Stab AO
-412S: A resin composition was obtained in the same manner as in Example 1 except that 0.15 part of Asahi Denka Co., Ltd.) was additionally added. Table 1 shows the evaluation results of the resin composition.

Examples 3 to 8 Example 1 except that the amount of each compounding agent was changed to the amounts shown in Table 1.
A resin composition was obtained in the same manner as. However, polyethylene terephthalate (2) has an intrinsic viscosity of 0.85 (Kanebo Co., Ltd.), and tetrabromobisphenol A-type phenoxy resin (2) has an average degree of polymerization of about 16. In addition to talc as an inorganic compound, mica (A-21S:
Yamaguchi Mica Co., Ltd. product name), Wollastonite (NYA
D325: product name of NYCO, kaolin (SATI)
NTON No. 5: ENGELHARD (trade name), calcium silicate (reagent) were used. Furthermore, TPE
E is polytetrafluoroethylene resin (Polyflon F1
04: product name manufactured by Daikin Industries, Ltd.). Table 1 shows the evaluation results of the resin composition.

[0042]

[Table 1]

Comparative Examples 1 to 8 Resin compositions were obtained in the same manner as in Example 1 except that polyethylene terephthalate and compounding ingredients shown in Table 2 were used. However, the tetrabromobisphenol A type epoxy resin (3) has an average degree of polymerization of about 2. Calcium carbonate (reagent) was also used as a comparative inorganic compound.

[0044]

[Table 2]

As is clear from comparison between Table 1 as an example and Table 2 as a comparative example, each of the compositions of the present invention has high flame retardancy even in a thin molded article, molding fluidity and mechanical strength. It can be seen that all of the above are good, and also that they are excellent in releasability.

[0046]

As described above, according to the present invention, the flame retardancy, the molding fluidity and the mechanical strength are all excellent, and the mold releasability is also excellent, and the composition enables the molding high cycle. You can get things.

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Claims (2)

[Claims] 1. To (A) 100 parts by weight of a polyethylene terephthalate thermoplastic polyester having an ethylene terephthalate unit as a main constituent, (B) the following general formula (I): High molecular weight tetrabromobisphenol A type phenoxy resin 1 represented by (n is 12 or more in average degree of polymerization)
To 50 parts by weight, (C) 0.1 to 15 parts by weight of at least one antimony compound selected from the group consisting of antimony oxide and sodium antimonate, (D) 0.05 to 12 parts by weight of an aromatic polycarbodiimide, And (E) 0.1 to 60 parts by weight of at least one inorganic compound selected from the group consisting of silicate compounds and silicic acid, and (F) 0 to 0 parts by weight of reinforcing filler. Terephthalate resin composition. 2. The flame-retardant polyethylene terephthalate resin composition according to claim 1, wherein the inorganic compound is at least one kind of a silicate compound selected from the group consisting of talc, mica, kaolin, and wollastonite.