JP3238620B2 - Polyester resin composition and method for producing the same - Google Patents

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 containing a rubber-reinforced styrene resin and a method for producing the same, and relates to mechanical properties, particularly impact resistance and weld properties,
An object of the present invention is to provide a good molding material having a balanced melt viscosity.

[0002]

2. Description of the Related Art Thermoplastic polyesters typified by polybutylene terephthalate and polyethylene terephthalate have high processability,
Due to its excellent mechanical properties, other physical and chemical properties, it is widely used in the fields of automotive parts, electrical and electronic equipment parts, and other precision equipment parts, but has low notched impact strength and injection molding Since the molding shrinkage at the time is large, it has disadvantages such as insufficient dimensional stability,
These improvements are desired. Therefore, in order to improve the impact resistance of these thermoplastic polyesters, a method of blending a rubber-reinforced styrene resin such as an ABS resin (Japanese Patent Publication No.
No. 25261) and a method for improving physical properties by introducing a functional group into ABS resin and AS resin blended with thermoplastic polyester (JP-A-54-23656, JP-A-1-163249).
Publication). However, although the resin composition obtained by the above method improves dimensional stability, impact resistance may be insufficient and may cause problems in practical use, or melt viscosity may be too high, such as injection molding. There was a problem during molding, and further improvement was desired. On the other hand, because the affinity between polybutylene terephthalate and rubber-reinforced styrene resin is not sufficient, dispersion failure is likely to occur due to kneading and molding conditions, and the mechanical properties of the obtained resin composition are not stable, or There is a problem that the strength of the weld portion is reduced.

[0003]

Means for Solving the Problems The present inventors have made intensive studies to solve these problems, and as a result, a rubber-reinforced styrene resin and a specific epoxy group-containing styrene block copolymer were added to thermoplastic polyester. By melt-kneading at a specific ratio, the impact resistance without significantly impairing the excellent properties of the polyester, weld properties, found that it is possible to provide a good thermoplastic polyester resin composition with a balance of melt viscosity, The present invention has been completed. That is, the present invention relates to (A) a thermoplastic polyester resin 97
(C) 0.1 to 20 parts by weight of an epoxy group-containing styrene-based block copolymer per 100 parts by weight of a resin component consisting of up to 10 parts by weight and (B) 3 to 90 parts by weight of a rubber-reinforced styrene resin. Polyester resin composition, and (A)
A process for producing a polyester resin composition, which comprises subjecting the mixture to heating and kneading for at least 30 seconds in the co-presence of components (B) and (C).

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The (A) thermoplastic polyester resin of the present invention means terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, diphenylether dicarboxylic acid, α, β-bis (4-carboxyphenoxy) One or two of dicarboxylic acids such as ethane, adipic acid, sebacic acid, azelaic acid, decanedicarboxylic acid, dodecanedicarboxylic acid, cyclohexanedicarboxylic acid, and dimer acid or ester-forming derivatives thereof.
Species and more, ethylene glycol, propylene glycol, butanediol, pentanediol, neopentyl glycol, hexanediol, octanediol, decanediol, cyclohexanedimethanol, hydroquinone, bisphenol A, 2,2-bis (4'-hydroxyethoxyphenyl) ) Propane, xylene glycol,
Polyethylene ether glycol, polytetramethylene ether glycol, a polyester resin obtained by a polycondensation reaction with glycols selected from one or more kinds of aliphatic polyester oligomers having both ends hydroxyl groups, such as a homopolyester, It may be any of the copolyesters. Other than the above, as comonomer components for composing the copolyester, glycolic acid, hydroxy acid, hydroxybenzoic acid, hydroxyphenylacetic acid, hydroxycarboxylic acid such as naphthyl glycolic acid, propiolactone, butyrolactone, caprolactone, valerolactone Such lactone compounds can also be used, and polyfunctional ester-forming components such as trimethylolpropane, trimethylolethane, pentaerythritol, trimellitic acid, trimesic acid, and pyromellitic acid as long as the thermoplasticity can be maintained. And a polyester having a branched or cross-linked structure.
Also, dibromoterephthalic acid, tetrabromoterephthalic acid, tetrachloroterephthalic acid, 1,4-dimethyloltetrabromobenzene, tetrabromobisphenol A,
Polyester copolymers having a halogen compound using a compound having a halogen compound as a substituent on an aromatic nucleus such as an ethylene or propion oxide adduct of tetrabromobisphenol A and having an ester-forming group are also included. Further, a polyester elastomer constituting a block copolymer of a high melting point hard segment and a low melting point soft segment can also be used. Examples of the polyester elastomer include a block copolymer of a hard segment mainly composed of an alkylene terephthalate unit and a soft segment composed of an aliphatic polyester or polyether. These thermoplastic polyester resins can be used alone or as a mixture of two or more as the component (A). Particularly preferred thermoplastic polyester resins are polybutylene terephthalate, polyethylene terephthalate and copolymers having these as main repeating units, and the comonomer components forming the copolymer are particularly preferably isophthalic acid, bisphenol A, 2 2,2-bis (β-hydroxyethoxyphenyl) propane, 2,2-bis (β-hydroxyethoxytetrabromophenyl) propane and the like.

The rubber-reinforced styrene resin (B) of the present invention is obtained by polymerizing an aromatic vinyl monomer and, if necessary, other copolymerizable vinyl monomers in the presence of a rubbery polymer. Of the obtained copolymer or the copolymer, an aromatic vinyl-based monomer and an aromatic vinyl-based polymer obtained by polymerizing another copolymerizable vinyl-based monomer as necessary. It is a mixture. The rubbery polymer referred to here is a polymer that is rubbery at room temperature, and preferably has a glass transition temperature of −20 ° C. or lower. Specifically, polybutadiene, polyisoprene, ethylene-propylene-ethylidene norbornene copolymer, ethylene-propylene-dicyclopentadiene copolymer, ethylene-propylene-5-ethylidene-2-norbornene copolymer, acrylonitrile-butadiene copolymer Examples thereof include polymers, diene copolymers such as isoprene-isobutylene copolymer, n-butyl acrylate, and acrylate rubbers which are copolymers with acrylic acid ester monomers copolymerizable therewith. Among these, polybutadiene (B
R), diene rubbers such as styrene-butadiene copolymer (SBR), ethylene-propylene-5-ethylidene-2-norbornene copolymer (EPDM) and poly-
Acrylate rubbers such as n-butyl acrylate are preferred. These rubbery polymers are produced by emulsion polymerization, solution polymerization, suspension polymerization, bulk polymerization and the like. The particle size and gel content of the rubbery polymer in the case of production by emulsion polymerization are not particularly limited, but preferably have an average particle size of 0.1 to 1 μm and a gel content of 0 to 95%.

As the aromatic vinyl monomers, styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, t-butylstyrene, α-methylvinyltoluene, dimethylstyrene, chlorostyrene Styrene, dichlorostyrene, bromostyrene, dibromostyrene and the like are exemplified, and one or more kinds can be used. Particularly, styrene and α-methylstyrene are preferred. Other vinyl monomers copolymerizable with the aromatic vinyl monomer include vinyl cyanide monomers such as acrylonitrile and methacrylonitrile, methyl acrylate, ethyl acrylate, butyl acrylate,
Ethylhexyl acrylate, methyl methacrylate,
Ethyl methacrylate, propyl methacrylate, 2-
Examples include unsaturated carboxylic acid alkyl esters such as ethylhexyl methacrylate, and maleimide monomers such as maleimide, N-phenylmaleimide, N-methylmaleimide, and N-cyclohexylmaleimide.
More than one species can be used. Particularly, acrylonitrile, methyl methacrylate and N-phenylmaleimide are preferred.

As the polymerization method of the component (B), known emulsion polymerization, solution polymerization, suspension polymerization, bulk polymerization, or a combination thereof can be used. Examples of the aromatic vinyl monomer and other copolymerizable vinyl monomers constituting the aromatic vinyl polymer used by mixing with the copolymer include:
One or more arbitrary ones can be selected from the same group as those used for the graft copolymer. In addition, as a polymerization method of the polymer, known emulsion polymerization, solution polymerization, suspension polymerization, bulk polymerization, or a combination thereof is used.

The composition ratio of the rubbery polymer and the monomer in the rubber-reinforced styrene resin is not limited, but is preferably 15 to 80% by weight of the rubbery polymer and 85 to 20% by weight of the monomer. If the amount of the rubbery polymer is less than 15% by weight, the resulting resin composition has insufficient impact resistance, and if it exceeds 80% by weight, the affinity with the component (A) is insufficient. In addition, the composition ratio of the aromatic vinyl monomer and the other vinyl monomer in such a monomer is not limited, but the aromatic vinyl monomer 10 to 10
0% by weight, especially 30 to 70% by weight, other vinyl monomer 90 to 90%
0% by weight, especially 70-30% by weight is preferred. These rubber-reinforced styrene resins can be used alone or as a mixture of two or more as the component (B). Particularly preferred rubber-reinforced styrene resins include styrene-acrylonitrile-butadiene copolymer (ABS), styrene-acrylonitrile-ethylene-propylene-ethylidene norbornene copolymer (AES), and hydrogenated products thereof.

The mixing ratio of the thermoplastic polyester resin (A) and the rubber-reinforced styrenic resin (B) can be selected in a wide range. For example, 97 to 10 parts by weight of the thermoplastic polyester resin (A) and component (B) 3 To 90 parts by weight, preferably (A)
Component (B) is used in an amount of 5 to 80 parts by weight based on 95 to 20 parts by weight of the component.

The (C) epoxy group-containing styrenic block copolymer of the present invention refers to an aromatic vinyl polymer component (Ca) containing an aromatic vinyl monomer (C-a1) as a main component, and an epoxy resin. It is a copolymer in which a copolymer component (Cb) of an acrylic monomer having a group (C-b1) and a vinyl monomer (C-b2) copolymerizable therewith is blocked. Aromatic vinyl polymer component (C-
a) is not only a homopolymer component of the aromatic vinyl monomer (C-a1), but also a copolymer of a vinyl monomer (C-a2) copolymerizable with the monomer (C-a1). It may be a polymer component. As the aromatic vinyl monomer (C-a1) of the (Ca) component, styrene, α
-Methylstyrene, methyltoluene, dimethylstyrene, chlorostyrene, dichlorostyrene, bromostyrene, dibromostyrene, and the like, and one or more kinds can be used. Particularly preferred ones include styrene and α-methylstyrene. Other monomers (C-a2) copolymerizable with the aromatic vinyl monomer of the (Ca) component include vinyl cyanide monomers such as acrylonitrile and methacrylonitrile, methyl acrylate and ethyl acrylate. , Butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate and the like, alkyl esters of acrylic acid or methacrylic acid, maleimide, N-phenylmaleimide, maleimide monomers such as N-methylmaleimide, and one or more kinds thereof. Can be used. In particular, acrylonitrile, methyl methacrylate, and N-phenylmaleimide are preferred. Preferred (Ca) components include polystyrene and styrene-acrylonitrile copolymer. Also, (C-
a) When the component is a copolymer, the ratio of the (C-a1) monomer and the (C-a2) monomer in the (Ca) component is the weight of (C-a1) / (C-a2). By ratio
15/85 to 85/15.

The acrylic monomer (C-b1) having an epoxy group as the component (Cb) is a compound in which acrylic acid or methacrylic acid and a compound having an epoxy group are ester- or amide-bonded, and is glycidyl acrylate, glycidyl methacrylate. , N- [4- (2,3-epoxypropoxy)-
3,5-dimethylbenzyl] acrylamide, epoxidized stearyl alcohol and an ester of acrylic acid or methacrylic acid. In particular, glycidyl methacrylate and N- [4- (2,3-epoxypropoxy) -3,5
-Dimethylbenzyl] acrylamide is preferred. (C-
b) As the vinyl monomer (C-b2) copolymerizable with the acrylic monomer containing an epoxy group of the component, acrylonitrile, vinyl cyanide monomers such as methacrylonitrile, methyl acrylate, Examples thereof include alkyl esters of acrylic acid or methacrylic acid such as ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, and propyl methacrylate. Methyl methacrylate, methyl acrylate, and acrylonitrile are preferred. Preferred examples of the (Cb) component include glycidyl methacrylate-methyl methacrylate copolymer and glycidyl methacrylate-methyl acrylate copolymer. The ratio of the (C-b1) monomer and the (C-b2) monomer in the (Cb) component is 5/95 to 70/30 by weight ratio of (C-b1) / (C-b2).
And preferably 10/90 to 50/50. (Ca) − (C-
b) The method for producing the block copolymer may be a polymer reaction or a polymerization method, and the production method is not limited. For example, these
The (Ca) / (Cb) type block copolymer is obtained by polymerizing the monomer or monomer mixture constituting the (Ca) or (Cb) segment with a polymeric peroxide shown below (JP-A-60-141754). JP-A-6-3327) and polymerizing by a bulk polymerization method, a suspension polymerization method or an emulsion polymerization method using a known production process (described in JP-B-60-3327). As the polymeric peroxide, for example,

[0012]

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And the like. In this case, (C-
The polymer having a peroxy bond in the molecule produced by the first-stage polymerization reaction of the monomer or monomer mixture constituting the segment (a) or (Cb) is taken out of the reaction system as an intermediate, and is subjected to the next block copolymerization. It can be used as a raw material for polymer production, or can be subsequently subjected to block copolymerization without taking it out of the reaction system. The amount of the polymeric peroxide used in this first-stage polymerization reaction is as described in the above (C
0.1 to 10 parts by weight per 100 parts by weight of the monomer or monomer mixture constituting the -a) or (Cb) segment, the polymerization temperature is 40 to 140 ° C, and the polymerization time is 2 to 15 hours. ing. Further, during the production, a homopolymer of each monomer or an arbitrary copolymer of a monomer mixture may be by-produced, but it can be used as it is without any particular purification. The ratio of the (Ca) component and the (Cb) component of the epoxy group-containing styrenic block copolymer (C) is (Ca) / (C−
b) is from 20/80 to 80/20 by weight, preferably 30/7
It is 0 to 70/30. The amount of the epoxy group-containing styrenic block copolymer (C) in this composition is a total of 1% of the thermoplastic polyester (A) and the rubber-reinforced styrenic resin (B).
It is 0.1 to 20 parts by weight, preferably 1 to 10 parts by weight, based on 00 parts by weight. If the amount of the component (C) exceeds 20 parts by weight, the flowability may be reduced and the moldability may be impaired.
On the other hand, if the amount is too small, the effect of improving the weld characteristics and impact resistance of the molded product becomes insufficient.

Next, the resin composition of the present invention has a moldability,
Various fillers can be added as long as the physical properties are not impaired, and it is preferable to mix them in order to obtain a molded article excellent in mechanical strength, heat resistance, dimensional stability and electric properties. For this purpose, a fibrous, particulate, plate-like or hollow filler is used depending on the purpose. As the fibrous filler, glass fiber, asbestos fiber, carbon fiber, silica fiber,
Inorganic fibrous substances such as silica / alumina fibers, zirconia fibers, boron nitride fibers, silicon nitride fibers, boron fibers, potassium titanate fibers, and metal fibrous materials such as stainless steel, aluminum, titanium, copper, and brass. . Particularly typical fibrous fillers are glass fibers or carbon fibers. Incidentally, a high-melting-point organic fibrous substance such as polyamide, fluororesin, and acrylic resin can also be used.
On the other hand, as the particulate filler, carbon black, silica, quartz powder, glass beads, glass powder, calcium silicate, aluminum silicate, kaolin, talc, clay, diatomaceous earth, silicates such as wollastonite, Iron oxide, titanium oxide, oxides of metals such as alumina, calcium carbonate,
Examples thereof include metal carbonates such as magnesium carbonate, metal sulfates such as calcium sulfate and barium sulfate, silicon carbide, silicon nitride, boron nitride, and various metal powders. Examples of the plate-like filler include mica, glass flake, various metal foils, and the like. Also, as a hollow filler,
Shirasu balloons, metal balloons, glass balloons and the like can be mentioned. These fillers include organosilanes, organoboranes,
It is preferable to perform a surface treatment using an organic titanate or the like. These inorganic fillers can be used alone or in combination of two or more. The combined use of a fibrous filler, particularly a glass fiber or a carbon fiber, and a particulate or plate-like filler is a preferable combination in terms of having both mechanical strength, dimensional accuracy, electrical properties and the like. The amount of the inorganic filler added is the resin component (A)
And not more than 120 parts by weight based on the total of 100 parts by weight of (B)
If it is more than this, molding workability and toughness are impaired, which is not preferable. Particularly preferably, it is 70 parts by weight or less.

It should be noted that other thermoplastic resins such as a thermoplastic resin such as a polyvinyl chloride resin, a polyvinylidene chloride resin, a polycarbonate resin, a polyamide resin, a natural rubber and a synthetic rubber may be used without departing from the object of the present invention. Alternatively, additives such as a flame retardant, an antioxidant, an ultraviolet ray inhibitor, a lubricant, a release agent, a nucleating agent, a foaming agent, a crosslinking agent, and a coloring agent may be added.

The mixing order of the thermoplastic polyester resin (A), the rubber-reinforced styrenic resin (B) and the epoxy group-containing styrenic block copolymer (C) and the state thereof are not particularly limited, and include pellets, beads, powders and the like. (A)
, (B) and (C) must be heated and melted in the coexistence of the three components, and kneaded for at least 30 seconds. A method of preliminarily mixing two specific components and mixing the remaining components is exemplified. . As a mixing method, a known method such as a Banbury mixer, a roll, and an extruder can be adopted. In particular,
For example, after the components (A), (B) and (C) are uniformly mixed in advance with a mixer such as a tumbler or Henschel mixer,
The mixture is supplied to a single-screw or twin-screw extruder and subjected to a melt-kneading process to produce pellets. The kneading temperature is 5 to 100 ° C. higher than the temperature at which the resin component melts, and is particularly preferably 10 to 60 ° C. higher than the melting point of the resin. If the temperature is too high, decomposition of the resin and abnormal reaction occur, which is not preferable. or,
The kneading treatment time is at least 30 seconds to 15 minutes, preferably 1 to 10 minutes.

[0017]

Next, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited by these. Commercially available products were used for the thermoplastic polyester resin, the rubber-reinforced styrene resin, and the substances shown in Preparation Examples. Thermoplastic polyester resin (A) (A-1) PBT: polybutylene terephthalate resin (Duranex 2000 manufactured by Polyplastics Co., Ltd.) (A-2) Modified PBT: obtained using an acid component containing 15 mol% of isophthalic acid. Modified polybutylene terephthalate rubber-reinforced styrene resin (B) (B-1) ABS: styrene-acrylonitrile-butadiene copolymer styrene-acrylonitrile copolymer (74% by weight of styrene, 26% by weight of acrylonitrile) and styrene-acrylonitrile A mixture of butadiene copolymer (styrene 41% by weight, acrylonitrile 14% by weight, butadiene 45% by weight) in a weight ratio of 50/50 (B-2) ABS: styrene-acrylonitrile-butadiene copolymer (styrene 41 % By weight, acrylonitrile 14% by weight, butadiene 45% by weight) Preparation Example 1 Emissions-based block copolymer (C-1) of the preparation) a thermometer, a stirrer, a glass reaction vessel equipped with a condenser, pre-methyl methacrylate and distilled water 300 parts by weight
A solution obtained by dissolving 2.5 parts by weight of a polymeric peroxide having the following structural formula in 30 parts by weight and 20 parts by weight of glycidyl methacrylate was charged. After replacing the air in the reactor with nitrogen gas, the polymerization was started by heating to 65 ° C. while stirring. After 1.5 hours of polymerization while maintaining the temperature at 65 ° C., 35 parts by weight of styrene and 15 parts by weight of acrylonitrile were added. Then, the temperature was raised to 115 ° C., and polymerization was continued for 12 hours. After cooling to room temperature to complete the polymerization, the polymer was separated by filtration, washed well with water, and dried under vacuum to obtain a white granular poly [(styrene-acrylonitrile)-(methyl methacrylate-glycidyl methacrylate)] weight ratio. 35 /
A 15/30/20 block copolymer mixture was obtained. As the polymeric peroxide of this Preparation Example, one having the following structural formula was used.

[0018]

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Preparation Example 2 (Preparation of Epoxy Group-Containing Styrene Block Copolymer (C-2)) In advance, 40 parts by weight of methyl methacrylate and 10 parts by weight of glycidyl methacrylate were dissolved 2.5 parts by weight of the polymeric peroxide shown in Preparation Example 1 After polymerizing the solution,
A block having a poly [(styrene-acrylonitrile)-(methyl methacrylate-glycidyl methacrylate)] weight ratio of 35/1/40/10 according to Preparation Example 1 except that a mixture of 35 parts by weight of styrene and 15 parts by weight of acrylonitrile is used. A copolymer mixture was obtained. Preparation Example 3 (Production of Styrene Block Copolymer (C'-1)) A solution prepared by dissolving 2.5 parts by weight of the polymeric peroxide shown in Preparation Example 1 in 50 parts by weight of methyl methacrylate was polymerized, and then styrene 35 was added. Parts by weight and acrylonitrile
A block copolymer mixture having a poly [(styrene-acrylonitrile)-(methyl methacrylate)] weight ratio of 35/15/50 was obtained according to Preparation Example 1, except that 15 parts by weight of the mixture was used. Preparation Example 4 (Production of Epoxy-Modified Styrene-Acrylonitrile Copolymer (C'-2)) After sufficiently replacing the inside of a glass reactor equipped with a stirrer with nitrogen gas, 32 parts by weight of styrene, 14 parts by weight of acrylonitrile,
11 parts by weight of glycidyl methacrylate, 0.3 parts by weight of azobisisobutyronitrile and 43 parts by weight of toluene were charged. The reaction vessel was set in an oil bath at 80 ° C., and reacted for 1 hour while stirring under a nitrogen gas atmosphere. Then, the temperature of the oil bath was raised to 100 ° C., and the reaction was further performed for 1 hour. After cooling the obtained reaction solution to room temperature, methyl alcohol was added dropwise under vigorous stirring to precipitate and separate the reaction product. The reaction product was sufficiently washed with methyl alcohol and dried to obtain an epoxy-modified styrene-acrylonitrile copolymer.

Examples 1 to 9 and Comparative Examples 1 to 8 Polybutylene terephthalate resin (PBT) (A-1), A
The BS resins (B), (C-1), (C'-1), and (C'-2) were added in the amounts shown in Tables 1 and 2 and premixed with a Henschel mixer for 5 minutes. . This is the cylinder temperature 2
The mixture was melt-kneaded with an extruder at 60 ° C. to prepare a polyester resin composition. Next, using an injection molding machine, at a cylinder temperature of 260 ° C and a mold temperature of 60 ° C, a tensile test piece was prepared by providing gates at both ends in the length direction and forming a weld at the center, and using ASTM.
Weld characteristics were evaluated according to D638. In addition, an ASTM test piece was molded, a tensile test was performed according to ASTM D638, and an ASTM D256
An impact test was performed according to the following. The melt viscosity was measured at 250 ° C. The results are summarized in Tables 1 and 2. Examples 10 to 12, Comparative Examples 9 to 10 (A) to (C) Test pieces were prepared and evaluated in the same manner as in the above example, except that the types and ratios of the components were changed as shown in Table 3. . The results are summarized in Table 3.

[0021]

[Table 1]

[0022]

[Table 2]

[0023]

[Table 3]

[0024]

As is apparent from the above description and Examples, the polyester resin composition of the present invention has improved mechanical properties, and in particular, has excellent balance between impact resistance, weld properties, and melt viscosity. Can be provided.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-81616 (JP, A) JP-A-1-304153 (JP, A) JP-A-1-297466 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) C08L 51/04 C08G 59/20 C08L 53/00 C08L 67/02

Claims (5)

(57) [Claims] 1. A resin composition comprising (A) 97 to 10 parts by weight of a thermoplastic polyester resin and (B) 3 to 90 parts by weight of a rubber-reinforced styrene resin, (C) a polystyrene component (Ca), Contains an epoxy group
(Meth) acrylic ester or (meth) acrylic
Copolymerization of amide monomer and vinyl monomer other than styrene
(Cb) block copolymer, and styrene-acryloyl
Contains a nitrile copolymer component (Ca) and an epoxy group
(Meth) acrylic ester or (meth) acrylic
Copolymerization of amide monomer and vinyl monomer other than styrene
A polyester resin composition comprising 0.1 to 20 parts by weight of an epoxy group-containing styrenic block copolymer selected from block copolymers (Cb) . 2. The polyester resin composition according to claim 1, wherein the thermoplastic polyester resin (A) is a polyalkylene terephthalate. 3. The rubber-reinforced styrene resin (B) is one or more resins selected from styrene-acrylonitrile-butadiene copolymers and hydrogenated products of the copolymers. The polyester resin composition as described in the above. 4. Polybutylene terephthalate (A) 95 to 20 layers
Parts and styrene-acrylonitrile-butadiene copolymer
(B) 100 parts by weight of resin component consisting of 5 to 80 parts by weight
And a styrene-acrylonitrile copolymer component (Ca)
Glycidyl methacrylate-methyl methacrylate copolymer
1 to 10 parts by weight of the block copolymer (C) of the united component (Cb)
The polyester resin composition which mix | blends. 5. The method according to claim 1, wherein (A) is selected from the group consisting of :
Heat melting and kneading treatment for 30 seconds or more in the presence of components (B) and (C)
Production of polyester resin composition characterized by performing
Law.