JPH06287421A - Polyester resin composition - Google Patents

Abstract

PURPOSE:To provide the subject composition containing a fibrous reinforcing material, suppressed in warpage development due to incorporation of such fibrous reinforcing material, capable of giving molding of excellent heat resistance, mechanical properties and impact resistance. CONSTITUTION:The objective polyester resin composition can be obtained by incorporating 35-90wt.% of a resin component composed of (A) 55-99 pts.wt. of a thermoplastic polyester resin and (B) 1-45 pts.wt. of a vinyl polymer prepared by copolymerization between (B-1) vinyl cyanide monomer, (B-2) aromatic vinyl monomer and (B-3) epoxy group-contg. vinyl monomer with the proportion of the component B-3 being 0.1-1.5wt.% with (C) 3-45wt.% of a fibrous reinforcing material, (D) 5-40wt.% of a flaky inorganic filler and (E) 0-40wt.% of a granular inorganic filler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester resin composition used as a molding material for various heat appliances, electric / electronic machine parts, automobile parts and the like, and more specifically to heat resistance, mechanical properties and impact resistance. The present invention relates to a polyester resin composition capable of providing a molded article having excellent low warpage and excellent warpage.

[0002]

2. Description of the Related Art Thermoplastic polyester resins represented by polyethylene terephthalate and polybutylene terephthalate are used as polyester resin compositions for molding materials. These thermoplastic polyester resins are often not sufficiently satisfactory in terms of heat resistance and moldability by themselves, and usually, a reinforcing material such as a fibrous reinforcing material is added in order to improve heat resistance and moldability. Has been done. However, when a reinforcing material, particularly a fibrous reinforcing material, is added as described above, there is a problem that warpage of the obtained molded product becomes remarkable. Therefore, in order to suppress the occurrence of warpage when a fibrous reinforcing material is added to a thermoplastic polyester resin, JP-A-61-2758 and JP-B-51-2 are used.
As described in Japanese Patent No. 5261, etc., a polystyrene-based resin, a polycarbonate resin, a phenoxy resin, an ABS resin, an acrylonitrile- together with a fibrous reinforcing material.
A method of blending a styrene copolymer (AS resin) and the like, a method of using a fibrous reinforcing material and a plate-shaped reinforcing material together, and the like have been proposed.

[0003]

However, when a polystyrene resin is blended, the polystyrene resin is poor in compatibility with the thermoplastic polyester resin, leading to deterioration in mechanical properties and heat resistance. When compounded, there is a problem in that flow processability during molding is impaired or transesterification with a thermoplastic polyester resin occurs, resulting in deterioration of molding stability, mechanical properties, and heat resistance. Further, the phenoxy resin has a problem of high cost and poor profitability. Further, when the ABS resin is blended, there is a problem that heat resistance and rigidity are impaired, and the AS resin containing no polybutadiene is improved in heat resistance and rigidity as compared with the ABS resin. However, it has a problem of poor impact resistance. An object of the present invention is to provide a polyester resin composition which is excellent in heat resistance, mechanical properties and impact resistance, and which can provide a molded article excellent in low warpage.

[0004]

In view of the above situation, the present inventor has blended a thermoplastic polyester resin with a specific vinyl copolymer to obtain heat resistance, mechanical properties, impact resistance and low resistance. The inventors have found that a molded product having excellent warpage can be obtained, and have reached the present invention. That is, the polyester resin composition of the present invention comprises 55 to 99% by weight of a thermoplastic polyester resin (A), a vinyl cyanide monomer (B-1), an aromatic vinyl monomer (B-2) and an epoxy. A group-containing vinyl monomer (B-3) is polymerized,
The ratio of the epoxy group-containing vinyl monomer (B-3) is 0.1.
35 to 90% by weight of a resin component consisting of 1 to 45% by weight of a vinyl-based polymer (B) of 1.5% by weight, 5 to 57% by weight of a fibrous reinforcing material (C), and a plate-like inorganic filler ( D) 5-4
It is characterized by comprising 0% by weight and 0 to 40% by weight of a granular inorganic filler (E).

The thermoplastic polyester resin used as the component A in the present invention is a monomer containing an aromatic dicarboxylic acid or its ester-forming derivative and a diol or its ester-forming derivative as main components.
It is a polymer or copolymer obtained by a condensation reaction. In the present invention, the aromatic dicarboxylic acid used as the acid component includes terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid,
1,5-naphthalenedicarboxylic acid, bis (p-carboxyphenyl) methane, anthracene dicarboxylic acid, 4,
4'-diphenyl dicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, etc. are mentioned, and these ester-forming derivatives include their dialkyl esters, diaryl esters, etc.

The diol component used in the present invention is ethylene glycol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, decamethylene glycol, cyclohexanediene. Aliphatic diol having 2 to 10 carbon atoms such as methanol, polyethylene glycol, poly-1,
Examples include long-chain glycols having a molecular weight of 400 to 6000 such as 3-propylene glycol and polytetramethylene glycol. Examples of the polyester resin obtained from the aromatic dicarboxylic acid component and the diol component include polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate, polyhexamethylene terephthalate, polycyclohexylene dimethylene terephthalate, polyethylene-2,6-naphthalate, and the like. Alternatively, a copolymer containing these as a main component may be used. Among them, polyethylene terephthalate and polybutylene terephthalate are preferable because they have appropriate mechanical strength.

These thermoplastic polyester resins (A)
Is contained in the range of 55 to 99% by weight, preferably 7
It is in the range of 0 to 97% by weight. This is because when the thermoplastic polyester resin is contained in an amount of 55% by weight or more, a molded article excellent in chemical resistance, impact resistance and heat resistance can be obtained, and when it is 99% by weight or less, impact resistance and low warpage are obtained. This is because a molded product having excellent properties can be obtained. Also,
The thermoplastic polyester resin is a phenol / tetrachloroethane mixed solvent (mixing ratio is 1: 1 by weight),
The intrinsic viscosity [η] at a temperature of 23 ° C is 0.5 to 1.4.
Is preferred. This is because when the intrinsic viscosity is less than 0.5, the strength of the obtained molded article tends to decrease,
This is because if it exceeds 1.4, the fluidity at the time of molding may decrease and the filling property may become insufficient. In the present invention,
By containing the specific vinyl polymer (B), it is possible to suppress warpage of the molded product due to the incorporation of the fibrous reinforcing material and to improve the impact resistance of the molded product. . The component B vinyl polymer used in the present invention is obtained by polymerizing a graft monomer composed of a vinyl cyanide monomer, an aromatic vinyl monomer and an epoxy group-containing vinyl monomer. Is.

The vinyl cyanide monomer (B-1) used as the vinyl polymer is acrylonitrile,
Methacrylonitrile, ethacrylonitrile, fumaronitrile and the like can be mentioned, and these monomers can be used alone or in combination of two or more kinds. These vinyl cyanide monomers are preferably used in a proportion of 15 to 40% by weight in the graft monomer used for polymerization,
More preferably, it is in the range of 15 to 25% by weight. This is because the molded product obtained by setting the proportion of the vinyl cyanide monomer to 15% by weight or more has excellent impact resistance and chemical resistance. This is because the product can be obtained. As the aromatic vinyl monomer (B-2), styrene, α-methylstyrene, o-methylstyrene, 1,3-dimethylstyrene, p-methylstyrene, t-butylstyrene,
Examples thereof include halogenated styrene and p-ethylstyrene, and these monomers can be used alone or in combination of two or more kinds. These aromatic vinyl monomers are
It is preferably used in a proportion of 60 to 84.9% by weight, more preferably 70 to 83% by weight, in the graft monomer used for polymerization. This is because when the proportion of the vinyl cyanide monomer is 60 to 84.9% by weight, the resulting molded article has excellent impact resistance and excellent flow processability during molding.

Further, the epoxy group-containing vinyl monomer (B
Examples of -3) include glycidyl methacrylate and glycidyl acrylate, and glycidyl methacrylate is particularly preferable. The epoxy group-containing vinyl monomer is added to the graft monomer used for the polymerization in an amount of 0.1 to 1.
Used in a proportion of 5% by weight, preferably 0.2-1.2
Is the range. This is because when the proportion of the vinyl monomer containing an epoxy group is 0.1% by weight or more, a molded article having excellent impact resistance can be obtained, and when it is 1.5% by weight or less, the flow processing during molding is performed. This is because it has excellent properties. In the present invention, the vinyl polymer (B) is 35% by weight.
Other copolymerizable vinyl monomers may be used within the following ranges. Examples of such vinyl monomers include methacrylic acid esters such as methyl methacrylate,
Examples thereof include maleimide monomers such as 2-vinylpyridine, 4-vinylpyridine and N-phenylmaleimide.

The vinyl polymer (B) obtained by polymerizing the above monomers is contained in the range of 1 to 45% by weight, preferably 3 to 30% by weight. This is because when a vinyl polymer is contained in an amount of 1% by weight or more, a molded article excellent in impact resistance and low warpage can be obtained.
This is because a molded product excellent in chemical resistance, impact resistance and heat resistance can be obtained by the following. In addition, the vinyl polymer preferably has a reduced viscosity (η _SP / C) of 0.55 or less measured with a 0.2% dimethylformaldehyde solution from the viewpoint of flow processability during molding. In the present invention, the resin component consisting of the thermoplastic polyester resin (A) and the vinyl polymer (B) is contained in the range of 35 to 90% by weight, preferably 40 to 75% by weight. This is because when the content of the resin component is less than 35% by weight, there is a problem in shapeability and the fluidity at the time of molding is lowered, resulting in flow processability, and conversely 90% by weight.
This is because if it exceeds, heat resistance and moldability are poor.

Examples of the fibrous reinforcing material used as the component C of the present invention include glass fiber, alumina fiber, carbon fiber,
Inorganic fibers such as silicon carbide fibers, ceramic fibers and asbestos fibers, metal fibers, heat resistant organic fibers and the like can be mentioned. Specifically, the fiber diameter is 1 to 20 μm and the fiber length is 10
mm or less glass fiber or chopped strand of carbon fiber, glass fiber milled fiber, pitch-based carbon fiber, aromatic polyamide fiber, aromatic polyimide fiber, aromatic polyamideimide fiber, and the like, and these are used alone or in combination. be able to. Among them, chopped strands of glass fiber are particularly preferable. These fibrous reinforcements are contained in the range of 3 to 45% by weight,
It is preferably in the range of 5 to 40% by weight. This is because by containing the fibrous filler in an amount of 3% by weight or more, a molded product excellent in heat resistance and moldability can be obtained, and by setting it in an amount of 45% by weight or less, the flow processability at the time of molding is excellent. is there.

In the polyester resin composition of the present invention, the plate-shaped inorganic filler (D) and, if necessary, the granular inorganic filler (E) are added together with the above vinyl polymer (B), The warpage of the molded product can be further reduced. Examples of the plate-like inorganic filler (D) used in the present invention include flake-like inorganic fillers such as glass flakes, mica and talc, which are used alone or in combination of two or more kinds. can do. The plate-like inorganic filler has an average particle size of 5 to 1000 μm and an aspect ratio (length / thickness).
Is preferably in the range of 10 to 80. This is because a molded product excellent in mechanical strength can be obtained by setting the aspect ratio to 10 or more, and a molded product excellent in low warpage can be obtained by setting the aspect ratio to 80 or less. Moreover, the content of the plate-like inorganic filler is in the range of 5 to 40% by weight, preferably in the range of 5 to 40% by weight. This is because when the content of the plate-like inorganic filler is 5% by weight or more, a sufficient warpage suppressing effect is obtained, and when the content is 40% by weight or less, a molded article excellent in appearance and flow processability is obtained. This is because

As the granular inorganic filler (E) used in the present invention, various granular inorganic fillers can be used as long as they do not decompose at the processing temperature. Examples thereof include glass powder, glass beads, talc, Examples thereof include anhydrous silicic acid or silicates such as clay, calcium metasilicate, and silica powder, barium sulfate, and titanium oxide. Among them, silicic acid anhydride or silicate is particularly preferable. The average particle size of the granular inorganic filler is preferably in the range of 1 to 40 μm.
By using a granular inorganic filler having an average particle size of 1 μm or more, a molded product excellent in heat resistance can be obtained.
This is because when the thickness is 0 μm or less, the effect of suppressing warpage is obtained and the flow processability is also excellent. Further, the content of the granular inorganic filler is in the range of 0 to 40% by weight, preferably 5 to 30% by weight. This is because a molded product having excellent mechanical strength can be obtained by setting the content of the granular inorganic filler to 40% by weight or less. In addition,
When using a granular inorganic filler, it is preferable to use one that is sufficiently dried in advance, and if necessary, the surface of the filler is appropriately treated to improve the adhesiveness with the resin. Good.

Further, in the polyester resin composition of the present invention, it is preferable to add a bromine flame retardant (F) and an antimony compound (G) in order to impart flame retardancy to the molded product. As the brominated flame retardant (F) used in the present invention, a polymeric brominated flame retardant is preferable because it can prevent bleed-out of the flame retardant. Examples of the polymeric brominated flame retardant include pentaboromobenzyl polyacrylate, pentabromobenzyl polymethacrylate, polytetrabromoxylylene bismethacrylate, brominated polycarbonate, poly (2,4,6-tribromo) styrene. , Poly (2,4,5-tribromo)
Examples thereof include styrene, brominated crosslinked polystyrene, and brominated epoxy. These can be used alone or in combination of two or more kinds. The content of these brominated flame retardants is preferably in the range of 3 to 20% by weight, more preferably 5 to 18% by weight. This is because when the content of the brominated flame retardant is 3% by weight or more, a sufficient flame retardant effect is obtained, and when the content is 20% by weight or less, a molded product excellent in mechanical strength is obtained. Is.

The antimony-based compound (G) used in the present invention acts as a flame retardant aid for bromine-based flame retardants, and includes, for example, antimony trioxide, antimony pentoxide and sodium antimonate. These can be used alone or in combination of two or more. The content of these antimony compounds is preferably in the range of 1 to 10% by weight, more preferably 3 to 18% by weight.
Is the range. This is because when the content of the antimony compound is 1% by weight or more, a sufficient effect as a flame retardant aid is obtained, and when it is 10% by weight or less, a molded product excellent in mechanical strength is obtained. This is because. Furthermore, in the present invention, within a range that does not impair the effects of the present invention, a lubricant such as silica or stearate or a release agent, an ultraviolet absorber, a colorant containing a carbon black window pigment,
Known additives such as an antioxidant, an antistatic agent, a coupling agent, a foaming agent, a cross-linking agent and a heat stabilizer may be optionally added.

[0016]

EXAMPLES The present invention will be specifically described below with reference to examples. In the examples, the Izod impact strength is A
According to STM D-256, using a 75t molding machine manufactured by Mitsubishi Heavy Industries, Ltd., cylinder temperature 250 ° C, mold temperature 80
A notched test piece having a thickness of 6.3 mm formed at 0 ° C. was measured with a strograph manufactured by Toyo Seiki. The heat distortion temperature is A
According to STM D-648, using a 75t molding machine manufactured by Mitsubishi Heavy Industries, Ltd., cylinder temperature 250 ° C, mold temperature 80
The notched test piece having a thickness of 6.3 mm formed at 0 ° C. was measured with a bending stress of 4.6 Kg / cm ² using a heat distortion tenster manufactured by Toyo Seiki Co., Ltd. The flatness was measured using a 32t molding machine manufactured by Meiki Seisakusho Co., Ltd. with a cylinder temperature of 25.
100m with a thickness of 2mm molded at 0 ℃ and mold temperature of 80 ℃
A square plate of m × 100 mm was measured by using a three-dimensional coordinate measuring machine Zyzax manufactured by Tokyo Seimitsu Co., Ltd. The short shot pressure is 100 mm × 100 m with a thickness of 3 mm at a cylinder temperature of 240 ° C. using a molding machine M-100 manufactured by Meiki Seisakusho.
The minimum moldable pressure when a square plate of m was molded was expressed as a percentage with respect to the maximum pressure (2000 Kgf / cm 2) of the molding machine. Flame retardancy is 1.4mm under the above molding conditions.
12.7 mm x 127 mm rod-shaped test piece of
It measured based on L standard E9465.

Production of Vinyl Polymer 1 115 parts by weight of distilled water, 1 part by weight of tribasic calcium phosphate and 0.001 part by weight of Demol P (manufactured by Kao Corporation) were charged into a reaction vessel and stirred. Then, 23 parts by weight of acrylonitrile as a graft monomer, 76.7 parts by weight of styrene and 0.3 part by weight of glycidyl methacrylate, 0.5 part by weight of t-dodecyl mercaptan, and 0.17 part by weight of azobisisobutylnitrile. Gaffac GB-520
(Manufactured by Toho Chemical Industry Co., Ltd.) in an amount of 0.003 parts by weight,
It was added to the reaction vessel to form a suspension. Then, the temperature in the reaction vessel was raised to 75 ° C., and the temperature was maintained for 240 minutes to carry out polymerization. The vinyl polymer A thus obtained has a reduced viscosity of 0.4.
It was 9.

Production of Vinyl Polymer 2 115 parts by weight of distilled water, 1 part by weight of tribasic calcium phosphate and 0.001 part by weight of Demol P (manufactured by Kao Corporation) were placed in a reaction vessel and stirred. Then, as a graft monomer, 18 parts by weight of acrylonitrile, 81.75 parts by weight of styrene and 0.25 part by weight of glycidyl methacrylate, and t-
0.6 parts by weight of dodecyl mercaptan, 0.17 parts by weight of azobisisobutyl nitrile, Gafac GB-52
0.003 parts by weight of 0 (manufactured by Toho Chemical Industry Co., Ltd.) was added to the reaction vessel to form a suspension. Then, the temperature in the reaction vessel was raised to 75 ° C., and the temperature was maintained for 240 minutes to carry out polymerization. The reduced viscosity of the obtained vinyl-based polymer was 0.
It was 47.

Production of Vinyl Polymer 3 115 parts by weight of distilled water, 1 part by weight of tribasic calcium phosphate and 0.001 part by weight of Demol P (manufactured by Kao Corporation) were placed in a reaction vessel and stirred. Then, 28 parts by weight of acrylonitrile as a graft monomer, 71 parts by weight of styrene and 1 part by weight of glycidyl methacrylate, 0.8 part by weight of t-dodecyl mercaptan, 0.17 part by weight of azobisisobutylnitrile, and Gafac GB-520. 0.003 parts by weight of a mixture (manufactured by Toho Chemical Industry Co., Ltd.) was added to the reaction vessel to form a suspension. Then, the temperature in the reaction vessel was raised to 75 ° C., and the temperature was maintained for 240 minutes to carry out polymerization. The reduced viscosity of the obtained vinyl polymer was 0.55.

Production of Vinyl Polymer 4 115 parts by weight of distilled water, 1 part by weight of tribasic calcium phosphate and 0.001 part by weight of Demol P (manufactured by Kao Corporation) were charged into a reaction vessel and stirred. Then, 28 parts by weight of acrylonitrile as a graft monomer, 71.7 parts by weight of styrene and 0.3 part by weight of glycidyl methacrylate, 0.3 part by weight of t-dodecyl mercaptan, and 0.17 part by weight of azobisisobutylnitrile. Gaffac GB-520
(Manufactured by Toho Chemical Industry Co., Ltd.) in an amount of 0.003 parts by weight,
It was added to the reaction vessel to form a suspension. Then, the temperature in the reaction vessel was raised to 75 ° C., and the temperature was maintained for 240 minutes to carry out polymerization. The reduced viscosity of the obtained vinyl polymer is 0.53.
Met.

Production of Vinyl Polymer 5 115 parts by weight of distilled water, 1 part by weight of tribasic calcium phosphate and 0.001 part by weight of Demol P (manufactured by Kao Corporation) were placed in a reaction vessel and stirred. Then, 28 parts by weight of acrylonitrile as a graft monomer, 71.7 parts by weight of styrene and 0.3 part by weight of glycidyl methacrylate, 0.3 part by weight of t-dodecyl mercaptan, and 0.17 part by weight of azobisisobutylnitrile. Gaffac GB-520
(Manufactured by Toho Chemical Industry Co., Ltd.) in an amount of 0.003 parts by weight,
It was added to the reaction vessel to form a suspension. Then, the temperature in the reaction vessel was raised to 75 ° C., and the temperature was maintained for 240 minutes to carry out polymerization. The reduced viscosity of the obtained vinyl polymer is 0.53.
Met.

Production of Vinyl Polymer 6 115 parts by weight of distilled water, 1 part by weight of tribasic calcium phosphate and 0.001 part by weight of Demol P (manufactured by Kao Corporation) were placed in a reaction vessel and stirred. Then, 23 parts by weight of acrylonitrile as a graft monomer and 77 parts by weight of styrene,
0.5 parts by weight of t-dodecyl mercaptan, 0.17 parts by weight of azobisisobutyl nitrile, Gafac GB-
A mixture of 0.003 parts by weight of 520 (manufactured by Toho Kagaku Kogyo Co., Ltd.) was added to the reaction vessel to form a suspension. Then, the temperature in the reaction vessel was raised to 75 ° C., and the temperature was maintained for 240 minutes to carry out polymerization. The reduced viscosity of the obtained vinyl polymer was 0.49.

Production of Vinyl Polymer 7 115 parts by weight of distilled water, 1 part by weight of tribasic calcium phosphate and 0.001 part by weight of Demol P (manufactured by Kao Corporation) were charged into a reaction vessel and stirred. Then, 23 parts by weight of acrylonitrile as a graft monomer, 75 parts by weight of styrene and 2 parts by weight of glycidyl methacrylate, 0.3 part by weight of t-dodecyl mercaptan, 0.17 part by weight of azobisisobutylnitrile, and Gafac GB-520. 0.003 parts by weight of a mixture (manufactured by Toho Chemical Industry Co., Ltd.) was added to the reaction vessel to form a suspension. Then, the temperature in the reaction vessel was raised to 75 ° C., and the temperature was maintained for 240 minutes to carry out polymerization. The reduced viscosity of the obtained vinyl polymer was 1.74.

Production of Vinyl Polymer 8 115 parts by weight of distilled water, 1 part by weight of tribasic calcium phosphate and 0.001 part by weight of Demol P (manufactured by Kao Corporation) were charged into a reaction vessel and stirred. Then, as a graft monomer, 23 parts by weight of acrylonitrile, 76.95 parts by weight of styrene and 0.05 part by weight of glycidyl methacrylate, and t-
0.5 parts by weight of dodecyl mercaptan, 0.17 parts by weight of azobisisobutyl nitrile, Gafac GB-52
0.003 parts by weight of 0 (manufactured by Toho Chemical Industry Co., Ltd.) was added to the reaction vessel to form a suspension. Then, the temperature in the reaction vessel was raised to 75 ° C., and the temperature was maintained for 240 minutes to carry out polymerization. The reduced viscosity of the obtained vinyl-based polymer was 0.
It was 49.

Examples 1 to 18 Polybutylene terephthalate having an intrinsic viscosity [η] of 1.0,
Vinyl polymer shown in Table 1, glass fiber having a fiber diameter of 13 μm and a fiber length of 3 mm (ECS03T manufactured by Nippon Electric Glass Co., Ltd.
-191), average particle size 60 μm, mica with aspect ratio 35 (M-200CT manufactured by Repco), average particle size μm
Glass beads (GB-731 manufactured by Toshiba Ballotini Co., Ltd.
B) was blended in the proportions shown in Table 1 and mixed for 5 minutes with a super mixer manufactured by Kawata Co., Ltd., and then pellets were produced with a single screw extruder having a screw diameter of 65 mm. Using the obtained pellets, Izod impact strength, heat distortion temperature, flatness and short shot pressure were measured, and the results are shown in Table 1. As is clear from Table 1, Examples 1 to 4 using the polyester resin composition of the present invention,
All of them have high Izod impact strength and excellent impact resistance, high heat deformation temperature and heat resistance, low flatness, low warpage, low short shot pressure and excellent formability. Met.

[0026]

[Table 1]

Examples 19 to 36 Polybutylene terephthalate having an intrinsic viscosity [η] of 1.0,
Vinyl-based polymer shown in Table 2, fiber 13 μm, glass fiber having fiber length 3 mm (ECS03T- manufactured by Nippon Electric Glass Co., Ltd.)
191), mica having an average particle size of 60 μm and an aspect ratio of 35 (M-200CT manufactured by Repco), and glass beads having an average particle size of 30 μm (GB-731 manufactured by Toshiba Ballotini).
B), brominated epoxy (SR-TP manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.
2) and antimony trioxide (Firecut AT-3 manufactured by Suzuyu Chemical Co., Ltd.) were blended in the proportions shown in Table 2, mixed for 5 minutes with a Kawata super mixer, and then single screw extrusion with a screw diameter of 65 mm. Machine produced pellets. Using the obtained pellets, Izod impact strength,
The heat distortion temperature, flatness and short shot pressure were measured, and the results are shown in Table 2. As is clear from Table 2, Example 5 using the polyester resin composition of the present invention
All of Nos. 8 to 8 were excellent in impact resistance, heat resistance, low warpage, moldability and flame retardancy.

[0028]

[Table 2]

Comparative Examples 1 to 17 Polybutylene terephthalate having an intrinsic viscosity [η] of 1.0,
Vinyl polymer shown in Table 3, glass fiber having a fiber diameter of 13 μm and a fiber length of 3 mm (ECS03T manufactured by Nippon Electric Glass Co., Ltd.
-191), average particle size 60 μm, mica with aspect ratio 35 (M-200CT manufactured by Repco), average particle size 30 μm
Glass beads (GB-731 manufactured by Toshiba Ballotini Co., Ltd.
B) was blended in the proportions shown in Table 3 and mixed for 5 minutes with a super mixer manufactured by Kawata Co., Ltd., and then pellets were produced with a single-screw extruder having a screw diameter of 65 mm. Using the obtained pellets, Izod impact strength, heat distortion temperature, flatness and short shot pressure were measured, and the results are shown in Table 3. As is clear from Table 3, in Comparative Examples 1 to 17, whether the impact resistance is poor or the moldability is poor,
The occurrence of sled was large.

[0030]

[Table 3]

[0031]

INDUSTRIAL APPLICABILITY According to the present invention, a polyester resin composition containing a fibrous reinforcing material is mixed with a specific vinyl copolymer, and a plate-like inorganic filler and, if necessary, a granular inorganic filler are added. By compounding it, while suppressing the warpage of the molded product due to the compounding of the fiber reinforcement, heat resistance,
It is possible to obtain a molded product having excellent mechanical strength and impact resistance, and to provide a polyester resin composition that can be used in a wide range of fields such as various heat appliances, electric / electronic parts, and automobile parts.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication C08L 63:00) (72) Inventor Hideyuki Shigemitsu 3816 Noborito, Tama-ku, Kawasaki-shi, Kanagawa Mitsubishi Rayon Shares Company Tokyo Institute

Claims (3)

[Claims] 1. A thermoplastic polyester resin 55-99% by weight (A), a vinyl cyanide monomer (B-1), an aromatic vinyl monomer (B-2) and an epoxy group-containing vinyl monomer. 1-45% by weight of a vinyl-based polymer (B) obtained by polymerizing (B-3), wherein the proportion of the epoxy group-containing vinyl monomer (B-3) is 0.1-1.5% by weight. 35 to 90% by weight of a resin component consisting of 3 to 45% by weight of a fibrous reinforcing material (C), 5 to 40% by weight of a plate-like inorganic filler (D) and 0 to 40% by weight of a granular inorganic filler (E). A polyester resin composition comprising: 2. The vinyl polymer (B) comprises 15 to 40% by weight of a vinyl cyanide monomer (B-1), 60 to 84.9% by weight of an aromatic vinyl monomer (B-2), and The polyester resin composition according to claim 1, which is obtained by polymerizing 0.1 to 1.5% by weight of an epoxy group-containing vinyl monomer (B-3). 3. The polyester resin composition according to claim 1, which contains 3 to 20% by weight of a bromine flame retardant (F) and 1 to 10% by weight of an antimony compound (G).