JP2000212411A - Flame retardant polyester resin composition - Google Patents

Abstract

(57) [Abstract] [Problem] To suppress the generation of corrosive gas and the like during molding processing,
Provided is a flame-retardant polyester resin composition having excellent flame retardancy, mechanical properties, moldability, and excellent hydrolysis resistance. SOLUTION: The weight ratio of (A) polyester resin to (B) polyphenylene ether-based resin is from 95/5 to 55/4.
5, based on a total of 100 parts by weight of (A) the polyester resin and (B) the polyphenylene ether-based resin,
(C) 0.2 to 10 parts by weight of a compatibilizer, (D) 0.5 of red phosphorus
To 20 parts by weight, (E) triazine compound 0.2 to 15
A flame-retardant polyester resin composition comprising, by weight, 0.1 to 5 parts by weight of (F) a fluororesin and 3 to 250 parts by weight of (G) 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 particularly to a flame-retardant polyester resin composition having excellent hydrolysis resistance and a molded article comprising the flame-retardant polyester resin composition. About.

[0002]

2. Description of the Related Art Among thermoplastic resins, polyester resins are suitably used for electric and electronic parts, automobile parts and the like because of their excellent electric properties. In such a field, the flame retardancy specified by the UL standard is often required, and it has been known for a long time that flame retardancy is generally imparted by a flame retardant represented by a halogen / antimony-based flame retardant or the like. . Although adding flame retardancy by adding various halogen / antimony-based compounds has been tentatively successful, it generates corrosive hydrogen bromide and hydrogen chloride gas during combustion, or generates a large amount of black smoke. The disadvantage of doing so is pointed out.

As non-halogen flame retardants, water-containing inorganic compounds such as aluminum hydroxide and magnesium hydroxide, nitrogen compounds having a triazine ring, and phosphate esters are generally known. However, these compounds have insufficient flame-retarding effects on halogen-based flame retardants, and need to be added in a relatively large amount, and therefore have the disadvantage of impairing mechanical strength and the like.

Further, a flame-retardant resin composition containing a saturated polyester, polyphenylene ether, a red phosphorus compound and a compatibilizer is disclosed in JP-A-5-339493. However, the balance between various properties such as flame retardancy, fluidity, and mechanical strength is insufficient, and the material has not yet been put to practical use as a flame retardant material.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to suppress the generation of corrosive gas and the like at the time of molding, and to excel in flame retardancy, mechanical properties, moldability, and hydrolysis resistance. An object of the present invention is to provide a flame-retardant polyester resin composition.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its gist is as follows.
(A) the weight ratio of the polyester resin and (B) the polyphenylene ether-based resin is 95/5 to 55/45,
(C) 0.2 to 10 parts by weight of a compatibilizer, (D) 0.5 to 20 parts by weight of red phosphorus, based on 100 parts by weight of the total of (A) the polyester resin and (B) the polyphenylene ether-based resin.
(E) 0.2 to 15 parts by weight of a triazine compound, (F)
0.1 to 5 parts by weight of fluororesin and (G) reinforcing filler 3
２５０250 parts by weight in the flame-retardant polyester resin composition.

Hereinafter, the present invention will be described in detail. As the (A) thermoplastic polyester resin in the present invention,
Examples include a thermoplastic polyester resin obtained by polycondensation of at least one dicarboxylic acid component and at least one glycol component. Further, oxycarboxylic acid can be used for polycondensation. As the dicarboxylic acid component,
Examples include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, diphenyldicarboxylic acid, adipic acid, sebacic acid, dodecine diacid, and ester-forming derivatives thereof. The dicarboxylic acids preferably include aromatic dicarboxylic acids and ester-forming derivatives thereof, and more preferably include terephthalic acid and terephthalic acid diester.

The glycol component includes α, ω-alkylene glycol, neopentyl glycol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, polyoxyethylene glycol, polyoxyethylene glycol represented by the following general formula (1). Oxytetramethrene glycol, or an ester-forming derivative thereof, and the like, preferably α, ω-alkylene glycol such as ethylene glycol and 1,4-butanediol, and more preferably 1,4- Butanediol.

[0009]

Embedded image HO (CH ₂ ) _q OH (q is an integer of 2 to 20) (1)

Examples of the oxycarboxylic acid include oxybenzoic acid, 4- (2-hydroxyethoxy) benzoic acid, and ester-forming derivatives thereof. As the acid component or the diol component forming the polyester, two or more types can be used, and it is preferable that 70 mol% or more is a single component. Specific examples of the thermoplastic polyester resin include polybutylene terephthalate, a polyester resin obtained by polycondensing a diol component containing polyoxytetramethylene glycol and 1,3-butanediol and a dicarboxylic acid component containing terephthalic acid, and polybutylene terephthalate. Phthalate, polycyclohexane dimethanol terephthalate, polyethylene terephthalate, polyethylene naphthalate and the like, preferably, polybutylene terephthalate, a diol component containing polyoxytetramethylene glycol and 1,3-butanediol, and a dicarboxylic acid component containing terephthalic acid And a polyester resin obtained by polycondensation.

The intrinsic viscosity of the thermoplastic polyester resin is as follows:
Preferably it is 0.4-1.3, more preferably 0.1.
5 to 1.2. The measurement condition of the intrinsic viscosity is 35 ° C. in orthochlorophenol.

The (B) polyphenylene ether-based resin in the present invention includes a polyphenylene ether resin and a mixture of a polyphenylene ether resin and a styrene-based resin. Examples of the polyphenylene ether resin include a homopolymer or a copolymer having a structure represented by the following general formula (2). In the formula, R ¹ represents a hydrogen atom or a primary or secondary alkyl group, an aryl group, an aminoalkyl group, a hydrocarbonoxy group,
² is a primary or secondary alkyl group, aryl group,
Represents an alkylamino group, and r represents an integer of 10 or more. Primary alkyl groups include methyl, ethyl, n-
Propyl, n-butyl, n-amyl, isoamyl, 2-
Examples include methylbutyl, n-hexyl, 2,3-dimethylbutyl, 2,3- or 4-methylpentyl and heptyl groups. Secondary alkyl groups include isopropyl, sec-butyl, 1-ethylpropyl, and the like.

[0013]

Embedded image

The polyphenylene ether resin is preferably a polyphenylene ether resin, for example, 2,6.
A homopolymer composed of -dimethyl-1,4-phenylene ether unit, the above unit and 2,3,6-trimethyl-1,
A random copolymer comprising a combination with a 4-phenylene ether unit is exemplified.

The intrinsic viscosity of the polyphenylene ether resin is measured at 30 ° C. in chloroform.
0.2 to 0.8 dl / g, more preferably 0.1 to 0.8 dl / g.
25 to 0.7 dl / g, especially 0.3 to 0.6 d
1 / g. When the intrinsic viscosity is less than 0.2 dl / g, industrial production is difficult and the impact resistance of the composition tends to be insufficient. Easy to fall.

As the styrene resin, polystyrene,
Styrene butadiene copolymer and the like can be mentioned. When the polyphenylene ether resin is a mixture of a polyphenylene ether resin and a styrene resin, the weight ratio of the styrene resin to the polyphenylene ether resin is preferably from 1/99 to 40/60, and more preferably from 5/40.
95 to 40/60. Styrene resin is compatible with polyphenylene ether resin and lowers the apparent viscosity of polyphenylene ether resin.However, if it exceeds 40 parts by weight, burning time increases, dripping and ignition easily occur, and flame retarding performance decreases. It's easy to do.

In the flame-retardant polyester resin composition of the present invention, the weight ratio of (A) the thermoplastic polyester resin to (B) the polyphenylene ether-based resin is (A) / (B) =
95/5 to 55/45, preferably 90/10
６０60/40. If the amount of the polyphenylene ether-based resin is too small, the flame retardancy decreases, and if it is too large, the chemical resistance decreases.

The (C) compatibilizer in the present invention includes:
A compound for improving the dispersibility of the polyphenylene ether resin in the thermoplastic polyester resin, for example, a polycarbonate resin, a carboxyl group, a carboxylic ester group, an acid amide group, an imide group, an acid anhydride group, an epoxy group, an oxazolinyl group, Examples include compounds having one or more amino groups or hydroxyl groups, polycarbonate resins, phosphite compounds, and the like.

A carboxyl group, a carboxylic ester group,
Specific examples of the compound having one or more acid amide group, imide group, acid anhydride group, epoxy group, oxazolinyl group, amino group or hydroxyl group include epoxy group-added polyphenylene ether resin, hydroxyalkylated polyphenylene ether resin, terminal oxazoline Polyphenylene ether resin, a polyester resin having a carboxyl group terminal modified with polystyrene, a polyester resin having an OH group terminal modified with polyethylene, and the like. Preferably, the compatibilizer includes polycarbonate and phosphite, most preferably polycarbonate. The weight average molecular weight of the polycarbonate resin is a value measured by gel permeation chromatography based on polystyrene, and is preferably 30,000.
0 or less, more preferably 20,000 or less.

Examples of the phosphite include phosphites having a pentaerythrityl tetrayl group and the like. Specific examples include bis (nonylphenyl) pentaerythritol diphosphite, bis (2
4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite and the like, more preferably bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite
4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite and the like. The composition of the present invention may contain a compound generated by the decomposition (hydrolysis, thermal decomposition, etc.) of these phosphite triesters.

The content of the compatibilizer is 0.2 to 10 parts by weight based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether resin. The amount of the compatibilizer is 0.
If it is less than 2 parts by weight, the mechanical strength and the flame retardancy decrease, and
If the amount is more than 0 parts by weight, the surface appearance of the product deteriorates. The content of the compatibilizer is preferably based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether-based resin,
It is 0.3 to 8 parts by weight, more preferably 0.5 to 5 parts by weight.

The red phosphorus (D) in the present invention can be blended without any particular treatment.
Red phosphorus which has been treated to prevent it from igniting during storage is preferred. As a method of such processing,
For example, a method of catalytically suppressing oxidation of red phosphorus by adding a small amount of aluminum hydroxide or magnesium hydroxide to red phosphorus, a method of coating with paraffin or wax, a phenol-based, melamine-based, epoxy-based, unsaturated polyester-based Such as a method of coating with a thermosetting resin, or a method of treating red phosphorus with an aqueous solution of a metal salt such as copper, nickel, and silver to precipitate and stabilize a metal phosphorus compound on the red phosphorus surface. Can be The average particle size of red phosphorus is not particularly limited, but is preferably 10 μm or less, more preferably 1 μm or less, from the viewpoint of suppressing a decrease in mechanical strength.
μm or less.

The content of red phosphorus is 0.5 to 20 parts by weight based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether resin. The amount of red phosphorus added is 0.5
If the amount is less than 10 parts by weight, the flame retardant effect is not sufficient. If the amount is more than 20 parts by weight, an unpleasant odor derived from phosphorus and a decrease in mechanical properties become remarkable. When blending red phosphorus, master pelletized red phosphorus preliminarily blended with thermoplastic polyester is preferable for handling during mass production, and the content of red phosphorus in the master pelletized red phosphorus is preferably 20 to 35% by weight.
The content of red phosphorus is more preferably from 1 to 18 parts by weight, most preferably from 1.5 to 1 part by weight, based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether-based resin.
5 parts by weight.

The triazine compound (E) in the present invention includes melamine, cyanuric acid, isocyanuric acid, salts of melamine with cyanuric acid or isocyanuric acid, melam and melem, and preferably melamine and melem cyanurate. And the like.

The content of the triazine-based compound is 100% in total of the polyester resin and the polyphenylene ether-based resin.
It is 0.2 to 15 parts by weight with respect to parts by weight. If the content is less than 0.2 parts by weight, the flame retardancy is reduced, and if it exceeds 15 parts by weight, the mechanical properties are reduced. The content of the triazine-based compound is preferably 0.1 to 100 parts by weight in total of the polyester resin and the polyphenylene ether-based resin.
It is 3 to 12 parts by weight, more preferably 0.5 to 10 parts by weight.

The (F) fluororesin in the present invention includes polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer,
Examples include a fluorinated polyolefin such as a tetrafluoroethylene / hexafluoropropylene copolymer and vinylidene fluoride, and preferably include a polytetrafluoroethylene and a tetrafluoroethylene / hexafluoropropylene copolymer.

The melt viscosity of the fluororesin at 350 ° C. is preferably 1.0 × 10 ^{3 to} 1.0 × 10 ¹⁶ poise, more preferably 1.0 × 10 ⁴ to 1.0 × 10 ⁴ poise.
¹⁵ poise, most preferably 1.0 × 10 ¹¹ -1.
It is 0 × 10 ¹³ poise. When the melt viscosity is less than 1.0 × 10 ³ poise, the ability to prevent dripping at the time of combustion tends to decrease,
If it exceeds 1.0 × 10 ¹⁶ poise, the fluidity tends to decrease.

The content of the fluororesin is 0.1 to 5 parts by weight based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether resin. If the content of the fluororesin is less than 0.1 part by weight, the ability to prevent dripping at the time of combustion is insufficient, and if it exceeds 5 parts by weight, stability and mechanical properties at the time of production deteriorate. The content of the fluororesin is preferably 0.2 to 4 parts by weight, more preferably 0.3 to 3 parts by weight, based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether-based resin.

The (H) reinforcing filler in the present invention includes an organic filler and an inorganic filler.
Glass fiber, glass flake, glass beads, milled fiber, alumina fiber, carbon fiber, aramid fiber, titanium oxide, magnesium oxide, calcium carbonate, barium sulfate, boron nitride, potassium whisker, etc., preferably glass fiber Is mentioned. As the glass fiber, a glass fiber of non-alkali glass is preferable.

As the reinforcing filler, a reinforcing filler pre-treated with a silane-based or titanium-based coupling agent or the like for improving the interfacial adhesion to the thermoplastic polyester resin is preferable. The content of the reinforcing filler is 3 to 250 parts by weight, preferably 10 to 2 parts by weight, based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether-based resin.
00 parts by weight. Further, the content of the reinforcing filler is preferably 5 to 50% by weight, more preferably 6 to 45% by weight, based on the whole thermoplastic polyester resin composition.
It is. If the content of the reinforcing filler exceeds 50% by weight, the fluidity tends to decrease.

The thermoplastic polyester resin composition of the present invention preferably further contains a phosphate ester from the standpoint of further enhancing flame retardancy and fluidity. As the phosphate ester in the present invention, trimethyl phosphate,
Triethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate, and the like are preferable, and are preferably represented by the following general formula (3). Phosphate ester compounds are exemplified. In the following general formula (3), R ^{3 to} R ¹⁰ are each an H atom or an alkyl group having 1 to 6 carbon atoms,
Preferably it is a C1-C6 alkyl group, More preferably, it is a C1-C2 alkyl group, Most preferably, it is a methyl group. m is an integer of 0 to 4, preferably 1 to 3. R ¹¹ represents a structure selected from the following.

[0032]

Embedded image

When the thermoplastic polyester resin composition of the present invention contains a phosphate ester, the content of the phosphate ester is from 0 to 15 parts by weight based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether-based resin. It is. When a phosphate ester compound is contained, the melt viscosity is reduced and the fluidity is improved, but if the content exceeds 15 parts by weight, mechanical properties and hydrolysis resistance are liable to be reduced. The content of the phosphate compound is preferably 1 to 15 parts by weight, more preferably 2-1 to 100 parts by weight of the total of the polyester resin and the polyphenylene ether-based resin.
0 parts by weight.

The thermoplastic polyester resin composition of the present invention preferably further contains an epoxy resin in order to further enhance the effect of inhibiting hydrolysis. As the epoxy resin, preferably, a bisphenol A type epoxy resin obtained by reacting bisphenol A with epichlorohydrin is used. The epoxy equivalent of the epoxy resin is preferably 1000 or less, more preferably 500 or less.
Or less, and most preferably 300 or less.

When the thermoplastic polyester resin composition of the present invention contains an epoxy resin, the content of the epoxy resin is 0.01 to 5 parts by weight based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether resin. And preferably 0.02 to 3 parts by weight. When the epoxy resin is contained, the effect of inhibiting hydrolysis is increased, but when it exceeds 5 parts by weight, flame retardancy and thermal stability at the time of melting are likely to be reduced. The content of the epoxy resin is preferably 0.02 to 4 parts by weight, more preferably 0.03 to 3 parts by weight, based on 100 parts by weight of the total of the polyester resin and the polyphenylene ether-based resin.

The thermoplastic polyester resin composition of the present invention may contain known additives and the like. Examples of additives include dyes and pigments, antioxidants, heat stabilizers, mold release agents, ultraviolet absorbers, catalyst deactivators, lubricants, antistatic agents, color improvers, foaming agents, plasticizers, nucleating agents, and the like. Can be

The thermoplastic polyester resin composition of the present invention can be obtained by a known method. Examples of the production method include, for example, a method of dry blending using a blender or a mixer, a method of melt-mixing using an extruder, and the like.A melt-mixing is usually performed using a screw extruder and extruded into strands. Pelletization is preferred.

[0038]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist thereof. The measuring method of each characteristic is as follows.

(1) Flame retardancy: Flame retardancy test specimens obtained by injection molding were subjected to a UL-94 vertical combustion test by Underwriters Laboratories. (2) Mechanical properties: The tensile strength of a dumbbell specimen obtained by injection molding was measured according to ASTM D-638.

(3) Hydrolysis resistance: A tensile dumbbell test piece obtained by injection molding was treated with a pressure cooker tester at 121 ° C. and 2 atm for 100 hours.
The tensile strength was measured according to STM, D-638, and the retention (%) was determined. The higher the retention, the better the hydrolysis resistance.

(4) Fluidity: The pellets produced by the extruder were dried at 120 ° C. for 5 hours, and then the capillary diameter was set to 1 × 30 using a capillary with the furnace set at 270 ° C.
mm and the melt viscosity measured at a shear rate γ = 91.2 sec ⁻¹ .

The following components were used in Examples and Comparative Examples. (5) Polybutylene terephthalate: intrinsic viscosity 0.8
5. Made by Mitsubishi Engineering Plastics Co., Ltd. (Hereinafter also referred to as PBT) (6) Polyphenylene ether: intrinsic viscosity 0.36, manufactured by Mitsubishi Engineering-Plastics Corporation. (Hereinafter P
Also called PE. (7) Polystyrene: Dialex HF77, manufactured by Mitsubishi Chemical Corporation. (Hereinafter also referred to as PS)

(8) Compatibilizer-A: NOVAREX 702
2PJ-4LV, manufactured by Mitsubishi Chemical Corporation. (9) Compatibilizer-B: Mark PEP36, Asahi Denka Co., Ltd.
Made. (10) Red phosphorus: Nova Excel 140, red phosphorus surface-coated with phenol resin and aluminum hydroxide,
Manufactured by Rin Kagaku Kogyo Co., Ltd. (11) Red phosphorus master pellet: A master pellet obtained by blending PBT and Nova Excel 140,
Red phosphorus content 28% by weight. (12) Phosphate ester: PX200, manufactured by Daihachi Chemical Co., Ltd.

(13) Melamine cyanurate: Nitrogen content =
49%, manufactured by Mitsubishi Chemical Corporation. (14) Melem: Nitrogen content = 64%, Nissan Chemical Industries, Ltd.
Made. (15) Polytetrafluoroethylene: Polyflon FA
500, manufactured by Daikin Industries, Ltd. (Hereinafter also referred to as PTFE) (16) Epoxy resin: Mark EP-17, manufactured by Adeka Argus. (17) Glass fiber: T-123 / PL, NEC Glass
Co., Ltd. (Hereinafter also referred to as GF)

Examples 1 to 5 The various components were blended in the proportions shown in Table 1, and a 30 mm vented twin-screw extruder (T
EX-30C), the mixture was melt-kneaded at a set cylinder temperature of 260 ° C., and extruded into strands to form pellets. Using these pellets, an injection molding machine and a mold for ASTM molding, a mold for UL-94 combustion test specimen (thickness 1/32 ")
Was performed at a molding temperature of 255 ° C. and a mold temperature of 80 ° C. Table 1 shows the evaluation results.

[0046]

[Table 1]

Examples 6-7, Comparative Examples 1-4 Various components were blended in the proportions shown in Table 2, pelletized in the same manner as in Example 1, and these pellets were used. Injection molding was performed. Table 2 shows the evaluation results.

[0048]

[Table 2]

[0049]

The flame-retardant polyester resin composition of the present invention suppresses the generation of corrosive gas and the like during molding and during combustion by flame-retarding with a non-halogen-based flame retardant. It has excellent mechanical properties, flame retardancy, fluidity, appearance of molded products, and excellent hydrolysis resistance, and is suitable for thin-walled products such as connectors, relays, transformer members, case members, coil bobbins, and focus blocks.
It is suitable as a material for small electrical and electronic equipment parts, automobile parts, and mechanical parts.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) // (C08L 67/02 71:12 69:00 27:12 63:00) (72) Inventor Shigeru Muramatsu 5-6-2 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture F-term in Mitsubishi Engineering-Plastics Corporation Technical Center 4J002 BC035 BC055 BD134 BD144 BD154 CD055 CF031 CF041 CF051 CF071 CF081 CF101 CF181 CF273 CG003 CH072 CH073 CL065 DA018 DA056 DE078 DE138 DE148 DE188 DE238 DG048 DK008 DL008 EU187 EU197 EW049 EW069 FA018 FA045 FA048 FA068 FA088 FB076 FB098 FB266 FD015 FD018 FD035 FD132 FD135 FD136 FD137 FD139 FD203 FD209

Claims (9)

[Claims] The weight ratio of (A) a polyester resin to (B) a polyphenylene ether resin is from 95/5 to 55/4.
5, based on a total of 100 parts by weight of (A) the polyester resin and (B) the polyphenylene ether-based resin,
(C) 0.2 to 10 parts by weight of a compatibilizer, (D) 0.5 of red phosphorus
To 20 parts by weight, (E) triazine compound 0.2 to 15
A flame-retardant polyester resin composition comprising, by weight, 0.1 to 5 parts by weight of (F) a fluororesin and 3 to 250 parts by weight of (G) a reinforcing filler. 2. The polyester resin (A) is a polyester resin obtained by polycondensing a polybutylene terephthalate or polyoxytetramethylene glycol, a diol component containing 1,4-butanediol and a dicarboxylic acid component containing terephthalic acid. The flame-retardant polyester resin composition according to claim 1, wherein: 3. The flame-retardant polyester resin composition according to claim 1, wherein (B) the polyphenylene ether-based resin is a polyphenylene ether resin or a mixture of a polyphenylene ether resin and a polystyrene resin. 4. The flame-retardant polyester resin composition according to claim 1, wherein (C) the compatibilizer is a polycarbonate resin. 5. The method according to claim 1, wherein (E) the triazine compound is a triazine compound selected from the group consisting of a salt of melamine and cyanuric acid or isocyanuric acid, melam and melem. C. The flame-retardant polyester resin composition according to C. 6. The flame-retardant polyester resin composition according to claim 1, wherein (G) the reinforcing filler is glass fiber. 7. A phosphoric acid ester is used in an amount of 0.1 to 15 parts by weight based on a total of 100 parts by weight of (A) 90 to 55 parts by weight of a polyester resin and (B) 10 to 45 parts by weight of a polyphenylene ether-based resin. The flame-retardant polyester resin composition according to any one of claims 1 to 6, which is contained. 8. An epoxy resin is further used in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of (A) 90 to 55 parts by weight of a polyester resin and (B) 10 to 45 parts by weight of a polyphenylene ether resin. The flame-retardant polyester resin composition according to claim 7, which is contained. 9. A molded article obtained by molding the flame-retardant polyester resin composition according to claim 1.