JP2002128999A - Polyester resin composition and automotive parts comprising the resin composition - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To have excellent moldability, strength and impact resistance, and
Provided are a polyester resin composition exhibiting excellent resistance in an alkaline environment, and an automotive component comprising the resin composition. SOLUTION: The first invention comprises 95 to 10% by weight of a thermoplastic polyester resin (A component), 4 to 50% by weight of a polyamide resin (B component), and α-olefin and α, β.
An olefinic copolymer (C component) composed of 1 to 40% by weight of an unsaturated glycidyl ester and a reinforcing filler (D component) of 0 to 150 parts by weight based on 100 parts by weight of the resin composition.
The invention is characterized by a polyester resin composition in which parts by weight are blended, and the second invention is characterized by an automobile part comprising the polyester resin composition. The above object is achieved.

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 and an automobile part comprising the resin composition. More specifically, a polyester resin composition having excellent moldability, strength and impact resistance, and exhibiting excellent resistance in an alkaline environment (hereinafter, abbreviated as alkali resistance), and an automobile part comprising the resin composition About.

[0002]

2. Description of the Related Art Polybutylene terephthalate (hereinafter referred to as P
Thermoplastic polyester resins represented by BT and polyethylene terephthalate (hereinafter abbreviated as PET) are excellent in ease of processing, mechanical properties, heat resistance and other physical and chemical properties. It is widely used in the fields of automotive parts, electric / electronic equipment parts, and other precision equipment parts. However, PBT and P
It is a problem that polyester resins such as ET deteriorate in an alkaline environment.

Conventionally, in the field of automobiles, materials used for manufacturing parts around engines such as connectors, distributor parts, ignition coil parts, and the like are mainly polyester resins such as PBT and PET, and are resistant to wet heat (hydrolysis resistance). Sex) was required. In response to this demand, PBT having a small amount of carboxyl end groups is used, or a carboxyl end group is reacted with a specific compound to cap the carboxyl end group.
Hydrolysis resistance can be improved.

On the other hand, in recent years, polyester-based resins such as PBT have a property of being easily attacked by an alkaline substance. Particularly, glass fiber reinforced products have a remarkable decrease in strength due to alkali, and deterioration in an alkaline environment has been regarded as a problem. I have. When it is in contact with metal (Fe) as in the case of an insert molded product, Fe rusts (is oxidized) and water acts, so that an alkaline aqueous solution acts on parts. In the case of a PBT part, there is a possibility that cracks may be generated or eventually destroyed due to the action of an alkaline substance, particularly in a thin portion or a portion where distortion remains.

[0005]

With the trend toward lighter weight and higher performance of automobiles, resin automobile parts have been further reduced in thickness and size. Even if these resin parts are made thinner and smaller, they must exhibit sufficient strength for a long period of time. For this reason, polyester resin compositions which do not crack even in a thin portion or a portion where distortion remains, and have excellent alkali resistance, and automobile parts are currently demanded.

[0006]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve this problem, and have found that a thermoplastic resin-based resin is mixed with a polyamide resin and an olefin-based copolymer having a specific composition at a specific ratio. The present invention has found that the resin composition obtained by kneading can provide a thermoplastic polyester resin composition and an automobile part having significantly improved alkali resistance without impairing the excellent properties of the polyester resin. Is completed.

That is, in order to solve the above-mentioned problems, in the first invention of the present invention, 95 to 10% by weight of a thermoplastic polyester resin (A component) and 4 to 4% of a polyamide resin (B component).
A resin composition 100 comprising 50% by weight and 1 to 40% by weight of an olefin copolymer (component C) comprising an α-olefin and an α, β-unsaturated glycidyl ester.
Provided is a polyester resin composition characterized in that 0 to 150 parts by weight of a reinforcing filler (D component) is blended with respect to parts by weight.

Further, in the second invention of the present invention, 95 to 10% by weight of a thermoplastic polyester resin (component A), 4 to 50% by weight of a polyamide resin (component B), and α-olefin and α, β- 0 to 150 parts by weight of a reinforcing filler (D) and 100 parts by weight of an epoxy compound (E) based on 100 parts by weight of a resin composition comprising 1 to 40% by weight of an olefin-based copolymer (component C) comprising a saturated glycidyl ester ) 1
An automobile part characterized by being manufactured from a resin composition containing 30 parts by weight thereof.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. In the present invention, a thermoplastic polyester resin (hereinafter, may be simply referred to as component A) is a polymer having an ester group in a chain unit and is a polycondensation containing dicarboxylic acid or its ester derivative and diol as main components. It means a polymer or copolymer obtained by the reaction.

The dicarboxylic acid as a raw material of the component A includes terephthalic acid, isophthalic acid, orthophthalic acid,
1,5-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, biphenyl-2,2'-dicarboxylic acid, biphenyl-3,
3′-dicarboxylic acid, biphenyl-4,4′-dicarboxylic acid, bis (4,4′-carboxyphenyl) methane,
Aromatic dicarboxylic acids such as anthracene dicarboxylic acid and 4,4′-diphenyl ether dicarboxylic acid;
-Cyclohexanedicarboxylic acid, alicyclic dicarboxylic acids such as 4,4'-dicyclohexyldicarboxylic acid, adipic acid, sebacic acid, azelaic acid, aliphatic dicarboxylic acids such as dimer acid, and ester derivatives thereof. The dicarboxylic acid may be one kind or a mixture of two or more kinds. Particularly preferred among the dicarboxylic acids are terephthalic acid and its ester derivatives.

The diol component as a raw material of the component A includes an aliphatic or alicyclic diol having 2 to 20 carbon atoms,
Bisphenol derivatives and the like can be mentioned. Specific examples include ethylene glycol, tetramethylene glycol,
Propylene glycol, 1,5-pentanediol,
1,6-hexanediol, neopentyl glycol,
Decamethylene glycol, cyclohexanedimethanol, 4,4′-dicyclohexylhydroxymethane,
4,4'-dicyclohexylhydroxypropane, ethylene oxide addition diol of bisphenol A, and the like. Further, triols such as glycerin and trimethylolpropane are exemplified. The diol component may be one kind or a mixture of two or more kinds. Particularly preferred among the diol components is tetramethylene glycol.

As the component A, polybutylene terephthalate (PBT) comprising terephthal or its ester derivative and tetramethylene glycol is preferable. As described above, a dicarboxylic acid component other than terephthalic acid and tetramethylene glycol, and a diol component may be copolymerized. The proportion of terephthalic acid or its ester derivative in the dicarboxylic acid component is preferably 70 mol% or more, from the viewpoint of mechanical properties and heat resistance.
Mole% or more is more preferable. From the same viewpoint, the diol component preferably contains tetramethylene glycol in an amount of 70 mol% or more, and more preferably 90 mol% or more.

The intrinsic viscosity of PBT, PET, etc. as the component A is such that tetrachloroethane and phenol are 1: 1.
(Weight) In a mixed solvent, 0.5 to
1.5 dl / g is preferable, and 0.6-1.
It is 3 dl / g.

The polyamide resin (hereinafter sometimes simply referred to as component B) in the present invention includes ring-opening polymers of lactams, polymers obtained by polycondensation of diaminocarboxylic acids, amines and dibasic acids. Or polymers obtained by polycondensation with a compound equivalent thereto. Lactams include propiolactam, α-pyrrolidone, ε-caprolactam, enantholactam, ω-
Laurolactam, cyclododecalactam and the like, and as the diaminocarboxylic acid, aminocaproic acid,
7-aminoheptanoic acid, 11-aminoundecanoic acid, 9
-Aminononanoic acid and the like. Examples of the amines include hexamethylenediamine and metaxylylenediamine, and examples of the dibasic acids include terephthalic acid, isophthalic acid, adipic acid, sebacic acid, dodecane dibasic acid, and glutaric acid.

More specifically, polyamide 4, polyamide 6, polyamide 7, polyamide 8, polyamide 11,
Polyamide 12, Polyamide 6.6, Polyamide 6.
9, polyamide 6,10, polyamide 6,11, polyamide 6,12, polyamide 6T, polyamide 6/6.
6, polyamide 6/12, polyamide 6 / 6T, polyamide 6I / 6T, polyamide MXD6 and the like. The B component may be a single component or a mixture of two or more components.

The component B preferably has a specific range of polymerization degree, that is, a specific range of viscosity. That is, JI
According to SK6810, a concentration of 1 in 98% sulfuric acid.
% And a relative viscosity measured at a temperature of 25 ° C. in the range of 2.0 to 5.5 are preferred. When the relative viscosity is lower than 2.0,
If the mechanical properties decrease, and if the mechanical properties are higher than 5.5, the moldability is impaired, which is not preferable. A particularly preferred range of the relative viscosity is from 2.2 to 4.5.

In the present invention, α-olefin and α, β-
An olefin-based copolymer comprising an unsaturated glycidyl ester (hereinafter, may be simply referred to as a component C) is
A resin that is compatible with the A component and the B component and that functions to improve the impact resistance of the resin component containing the A component and the B component. The α-olefin (C1) in the component C includes ethylene, propylene, butene-1, pentene-1, and the like, with ethylene being particularly preferred.

The α, β-unsaturated glycidyl ester (C2) in the component C is a compound represented by the following general formula [I], and specifically includes glycidyl acrylate, glycidyl methacrylate, and glycidyl ethacrylate. And glycidyl itaconate. The α, β-unsaturated glycidyl ester (C2) may be used alone or as a mixture of two or more.
Particularly preferred among the α, β-unsaturated glycidyl esters (C2) are glycidyl acrylate and glycidyl methacrylate.

[0019]

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The copolymerization ratio of the α, β-unsaturated glycidyl ester (C2) in the component C is preferably 0.5 to 40% by weight. If the copolymerization ratio is less than 0.5% by weight, the effect of improving the impact resistance of the resin composition is not sufficient even if the component C is blended, and if it exceeds 40% by weight, the flowability of the resin composition during molding is reduced. , And both are not preferred. The preferred range of the copolymerization ratio of the α, β-unsaturated glycidyl ester (C2) is 1 to 30% by weight, and particularly preferably 2 to 20% by weight.

The component C includes, within a range of less than 40% by weight, another unsaturated monomer (C3) copolymerizable with the α-olefin (C1) and the α, β-unsaturated glycidyl ester (C2). Can be copolymerized and included. Other unsaturated monomers (C3) include methyl, ethyl, propyl, butyl and other acrylic acids and methacrylates; vinyl acetate,
Vinyl esters such as vinyl propionate; acrylonitrile, styrene, carbon monoxide, maleic anhydride and the like.

The C component is composed of α-olefin (C1) and α, β-
Unsaturated glycidyl ester (C2), and if necessary, other copolymerizable unsaturated monomers (C3), can be easily produced by standard random copolymerization or graft copolymerization. . The copolymerization reaction is generally carried out in an inert solvent, and examples of the inert solvent include benzene, chloroform, carbon tetrachloride and the like.

Preferred C components include ethylene-glycidyl methacrylate copolymer, ethylene-propylene-
Glycidyl methacrylate copolymer, ethylene-glycidyl methacrylate-carbon monoxide copolymer, ethylene-glycidyl methacrylate-vinyl acetate copolymer, ethylene-
Glycidyl methacrylate-methyl methacrylate copolymer is exemplified. Among them, an ethylene-glycidyl methacrylate-methyl methacrylate copolymer is particularly preferred.

In the polyester resin composition according to the present invention, the mixing ratio of the resin components, that is, the component A, the component B, and the component C is 95 to 10/4 to 50/50 by weight (%).
It shall be selected in the range of 1 to 40. A component is 95% by weight
When the value exceeds 10%, the effect of improving alkali resistance is not exhibited.
If the amount is less than% by weight, excellent tensile (bending) strength, heat resistance, crystallinity, moldability, fluidity, and the like, which are characteristics of the component A, are not exhibited, and all are not preferred. A particularly preferred mixing ratio of the above three components is in the range of 90 to 20/8 to 45/2 to 35.

The polyester resin composition according to the present invention comprises:
100 parts by weight of the above three types of resin components are mixed with a reinforcing filler (hereinafter, sometimes simply referred to as D component) in an amount of 0 to 15;
When the amount is in the range of 0 parts by weight, the object of the present invention is more effectively achieved. Among them, the range of 0 to 60% by weight is preferable, and the range of 0 to 40% by weight is more preferable. In the present invention, the reinforcing filler (D component) refers to a material which is contained in a resin component to improve strength and impact resistance.
Any form such as a fibrous, plate-like, or granular form may be used.

When the form of the D component is fibrous, it may be either inorganic or organic. Examples include inorganic fibers such as glass fiber, carbon fiber, silica / alumina fiber, zirconia fiber, boron fiber, boron nitride fiber, potassium silicon nitride titanate fiber, and metal fiber, and organic fibers such as fluororesin fiber. When the component D is fibrous, inorganic fibers are preferred, and glass fibers are particularly preferred. The D component may be one kind or a mixture of two kinds.

When the form of the component D is fibrous, the average fiber diameter and average fiber length are not particularly limited, but the average fiber diameter is preferably selected in the range of, for example, 1 to 100 μm.
The average fiber length is preferably selected, for example, in the range of 0.1 to 20 mm. The average fiber diameter is preferably about 1 to 50 μm, more preferably about 3 to 30 μm, and still more preferably about 5 to 20 μm. The average fiber length is preferably about 1 to 10 mm.

In order to improve the adhesion at the interface between the D component and the resin component, it is preferable to treat the surface of the D component with a sizing agent or a surface treatment agent. As a sizing agent,
Epoxy compounds and acrylic compounds are mentioned, and as surface treatment agents, functional compounds such as isocyanate compounds, silane compounds and titanate compounds are mentioned. The component D may be subjected to a surface treatment in advance with the sizing agent or the surface treatment agent, and the surface treatment may be performed by adding a sizing agent or a surface treatment agent when preparing the thermoplastic resin composition according to the present invention. Good.

In addition to the above-mentioned component D, other plate-like, granular or amorphous inorganic fillers (hereinafter may be simply referred to as component F) can be blended. Plate-like inorganic filler (F
1) exhibits a function of reducing anisotropy and warpage, and includes glass flakes, mica, metal foil, and the like. Preferred among the plate-like inorganic fillers (F1) are glass flakes.

Other particulate or amorphous inorganic fillers (F2) include ceramic beads, asbestos, wollastonite, talc, clay, mica, zeolite, kaolin,
Examples thereof include potassium titanate, barium sulfate, titanium oxide, silicon oxide, aluminum oxide, and magnesium hydroxide.

The polyester resin composition according to the present invention may also contain an epoxy resin (hereinafter sometimes simply referred to as component E). By blending the component E, the alkali resistance of the polyester resin composition according to the present invention can be further improved. In the present invention, the component E means an oligomer or polymer having an epoxy group at a molecular terminal and having a molecular weight of about several hundreds to tens of thousands. Specifically, glycidyl ether type (epoxy resin composed of bisphenol A and epichlorohydrin), glycidyl ester type (epoxy resin composed of carboxylic acids and epichlorohydrin), and glycidylamine type (amines and epichlorohydrin) classified from production raw materials And an alicyclic type. Among them, glycidyl ether type (bisphenol A
And an epoxy resin comprising epichlorohydrin).

The amount of the component E is 1 to 100 parts by weight of the three types of resin components A, B and C.
It is preferable to select in the range of 30 parts by weight. If the blending amount of the component E is less than 1 part by weight, the effect of improving alkali resistance is not exhibited, and if it exceeds 30 parts by weight, the reaction between the component E, the component A and the component B proceeds excessively, and some gelation occurs, Neither is preferred. The preferable amount of the component E is 5 to 25 parts by weight based on 100 parts by weight of the three kinds of resin components.

The polyester resin composition according to the present invention may contain a flame retardant for imparting flame retardancy. Examples of the flame retardant include organic halogen compounds, antimony compounds, phosphorus compounds, and other organic and inorganic compounds. Specific examples of the organic halogen compound include brominated polycarbonate, brominated epoxy resin, brominated phenoxy resin, brominated polyphenylene ether resin, brominated polystyrene resin, brominated bisphenol A, pentabromobenzyl polyacrylate, and the like.

Examples of the antimony compound include antimony trioxide, antimony pentoxide, sodium antimonate and the like. Examples of the phosphorus compound flame retardant include phosphoric acid ester, polyphosphoric acid, ammonium polyphosphate, and red phosphorus. Organic flame retardants other than the above, as inorganic flame retardants, melamine, nitrogen compounds such as cyanuric acid, aluminum hydroxide, magnesium hydroxide, silicon compounds,
Examples include inorganic compounds such as boron compounds.

The polyester resin composition according to the present invention may optionally contain various conventionally known resin additives. As various resin additives,
Antioxidants, UV absorbers, heat stabilizers, weather stabilizers,
Lubricants, release agents, coloring agents such as dyes and pigments, catalyst deactivators, antistatic agents, foaming agents, plasticizers, impact modifiers other than the C component,
Examples include a crystal nucleating agent and a crystallization accelerator.

The polyester resin composition according to the present invention may optionally contain other thermoplastic resins or thermosetting resins. Other thermoplastic resins include polyethylene, polypropylene, acrylic resin,
Examples include polycarbonate, polyacetal, polyphenylene oxide, polyphenylene sulfide, and liquid crystal polyester resin. Examples of the thermosetting resin include phenol resin, melamine resin, silicone resin, and epoxy resin. These may be one kind or two or more kinds.

The method for producing the polyester resin composition according to the present invention is not limited to a specific method, but is preferably a melting / kneading method. The melting and kneading method can be based on a method usually employed for a thermoplastic resin.

As a melting and kneading method, for example, A component, B component, C component and E component, and if necessary, D component are further added, and a Henschel mixer, ribbon blender, V
After uniformly mixing with a mold blender or the like, a method of melting and kneading with a single-screw or multi-screw kneading extruder, a roll, a Banbury mixer, a Labo Plast mill (Bradbender) or the like can be used. The temperature and kneading time when melting and kneading are
It can be selected depending on the type of the components constituting the resin component, the ratio of the components, the type of the melting and kneading machine, and the like, but the temperature for melting and kneading is preferably in the range of 200 to 300 ° C. 3
When the temperature exceeds 00 ° C., thermal deterioration of the A component, the B component, the C component and the like becomes a problem, and the physical properties of the molded product may be reduced and the appearance may be deteriorated.

The method for producing the desired molded article from the polyester resin composition according to the present invention is not particularly limited, and the molding methods conventionally used for thermoplastic resins, that is, injection molding, hollow molding, Method, extrusion molding method, compression molding method and the like. Examples of molded articles that can be produced include automotive parts around automobile engines, such as connectors, distributor parts, and ignition coil parts, electric and electronic equipment parts, and other precision equipment parts. Among them, automotive parts are preferred.

[0040]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following description unless it departs from the gist.

The abbreviations and contents of each component used in the examples and comparative examples are as follows. (1) Polybutylene terephthalate (component A): Phenol / tetrachloroethane = 50/50 (weight ratio) having an intrinsic viscosity of 0.85 dl / g measured at 30 ° C. in a mixed solvent. Abbreviated. (2) Polyamide 6 (component B): having a relative viscosity of 2.5 in concentrated sulfuric acid at 25 ° C. Hereinafter, this is abbreviated as “PA6”.

(3) Elvaloy (component C): ethylene-glycidyl methacrylate-methyl acrylate = 64 /
6/30 copolymer (trade name: Elvaloy, manufactured by DuPont-Mitsui Polychemicals). Hereinafter, this is abbreviated as “Elvaloy”. (4) EXL-2315: an acrylic core-shell type elastomer (Kureha Chemical Co., Ltd.). This is hereinafter referred to as "EXL-2
315 ". (5) Bisphenol A-diglycidyl ether type epoxy resin (E component): Epicoat 1010, manufactured by Shell Co., Ltd.
Epoxy equivalent about 4000). This is referred to below as "Epicoat 1
010 ”. (6) GF (D component): glass fiber having a fiber diameter of 13 μm (trade name: T-187, manufactured by Nippon Electric Glass Co., Ltd.). Hereinafter, this is abbreviated as “GF”.

Tests for evaluating physical properties of the resin compositions obtained in Examples and Comparative Examples were carried out by the methods described below. (a) Tensile strength (Mpa): Measured according to ASTM D-638. (b) Flexural strength (Mpa), flexural modulus (Gpa): ASTM standard D
It measured according to -790. (c) Izod impact strength (J / m): Measured in accordance with ASTM standard D-256 on test pieces having a thickness of 1/2 "and 1/8".

(D) Evaluation of alkali resistance: A flat plate having a size of 80 mm × 80 mm × 1 mm was formed by a film gate by an injection molding method, and the direction of glass fibers was perpendicular to the longitudinal direction of the strip from this flat plate. , Width 10mm, length 80mm
Cut out the strip-shaped test piece. This strip-shaped specimen is
It is attached to a SUS-shaped jig so as to bend in the longitudinal direction. The jig of the kamaboko type was prepared such that the bending strain at the center of the test piece was 1.5%. The jig on which the test piece is mounted is immersed in a 2.5N aqueous NaOH solution at room temperature. After immersion, the jig is occasionally pulled out of the NaOH aqueous solution, the NaOH aqueous solution on the surface of the test piece is wiped off with paper or cloth, and the surface is visually observed and the presence or absence of cracks is checked by a 20 to 30 times stereo microscope. If cracks were found on the surface of the test piece, the experiment was terminated. If no cracks were found, the test piece was again put together with the jig with NaOH.
Immerse in an aqueous solution. Until cracks are observed
This is a method of repeatedly evaluating the operation.

With respect to each test piece, the time until cracks occurred on the surface of the test piece was measured. It can be said that the longer the time, the better the test piece is in alkali resistance. It should be noted that the time for checking the occurrence of cracks by pulling up from the NaOH aqueous solution is 30 seconds, 45 seconds, 1 minute, 5 minutes, 10 minutes.
Minutes, 15 minutes, 30 minutes, 45 minutes, 1 hour, 2 hours, 4 hours, 8 hours, 24 hours, 48 hours, 72 hours, 96 hours, and 144 hours.

[Examples 1 to 5] The components and the mixing ratios shown in Table 1 were thoroughly mixed, and the resulting mixture was extruded with a vent port (Ikegai Iron Works, Model: PCM3).
0), the pressure was reduced to 600 Torr from a vent port installed downstream of the hopper, and the mixture was melt-kneaded under a kneading condition of a cylinder set temperature of 255 ° C. and a screw rotation speed of 200 rpm, and then extruded into a strand shape. It was cut and pelletized to obtain a thermoplastic resin composition.

The obtained pellets were dried with hot air at a temperature of 120 ° C. for 6 hours, and then set at a cylinder set temperature of 250 using an injection molding machine (manufactured by Toshiba Machine Co., Ltd., model: IS60B).
Approximately 260 ° C. and a mold temperature of 80 ° C., test pieces for evaluating mechanical properties were produced. With respect to the obtained test pieces, evaluation results such as tensile strength, bending strength, Izod impact strength, and alkali resistance test were performed. Table 1 shows the evaluation results.

[Comparative Examples 1 to 5] With the components and compounding ratios shown in Table 2, kneading was performed in the same manner as in the examples to obtain pellet-shaped thermoplastic resin compositions. Further, it was dried in the same manner as in the examples, and test pieces for evaluating mechanical properties were produced by an injection molding method. About the obtained test piece,
An evaluation test was performed in the same manner as in the examples. Table 2 shows the evaluation results.

[0049]

[Table 1]

[0050]

[Table 2]

From Tables 1 and 2, the following becomes clear. (1) The molded article from the polyester resin composition according to the present invention has a time to crack generation of 12 in the alkali resistance test.
Longer than time and excellent in alkali resistance (Example 1
To Example 5). (2) Molded articles from the resin composition of Comparative Example 5 were B component and C
Since the component and the component E are not contained, the time until crack generation in the alkali resistance test is extremely short, and the alkali resistance is poor. (3) Since the molded articles from the resin compositions of Comparative Examples 1 and 4 do not contain the component C, the time until crack generation in the alkali resistance test is extremely short, and the alkali resistance is poor. (4) Since the molded articles from the resin compositions of Comparative Examples 2 and 3 do not contain the component B, the time until crack generation in the alkali resistance test is short, and the alkali resistance is poor.

[0052]

As described in detail above, the present invention has the following particularly advantageous effects, and its industrial value is extremely large. 1. The molded article obtained from the polyester resin composition according to the present invention is hardly cracked or cracked even under a strain in an alkaline environment, and is excellent in alkali resistance. 2. Further, the molded article obtained from the polyester resin composition according to the present invention has good mechanical properties such as strength and impact resistance. Therefore, it is a very useful material for the automotive field, especially for the production of automotive parts around engines.

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C08L 63/00 C08L 63/00 A 77/00 77/00 (72) Inventor Ryo Saito 5-6-Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture No. 2 Mitsubishi Engineering Plastics Co., Ltd. Technology Center (72) Inventor Yoshitaka Kanazawa 5-6-1 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture Mitsubishi Engineering Plastics Co., Ltd. Technology Center (72) Inventor Toshiyuki Higashishima 5-6-2 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture F-term (reference) 4J002 BB07Y BD124 BN03Y CD025 CD055 CD085 CD135 CD19Y CF03W CF04W CF05W CF07W CF08W CL01X CL03X CL05X DA016 DA066 DE076 DE0766 DE186 DG046 DJ006 DJ016 DJ026 DJ036 DJ046 DJ056 DK006 DL006 FA016 FA044 FA046 FB096 FB166 FD130 GN00

Claims (7)

[Claims] 1. A thermoplastic polyester resin (A component) 9
5 to 10% by weight, 4 to 50% by weight of a polyamide resin (component B), and 1 to 40% by weight of an olefin copolymer (component C) composed of an α-olefin and an α, β-unsaturated glycidyl ester. A polyester resin composition characterized by comprising 0 to 150 parts by weight of a reinforcing filler (D component) per 100 parts by weight of a resin composition comprising: 2. The polyester resin composition according to claim 1, wherein the thermoplastic polyester resin (A component) is polybutylene terephthalate. 3. The polyester resin composition according to claim 1, wherein the polyamide resin (component B) is an aliphatic polyamide resin. 4. The olefin-based copolymer (component C) comprising an α-olefin and an α, β-unsaturated glycidyl ester is an ethylene-glycidyl methacrylate-methyl acrylate copolymer. 3
The polyester resin composition according to any one of the above. 5. The polyester resin composition according to claim 1, wherein the reinforcing filler (D component) is glass fiber. 6. A thermoplastic polyester resin (A component),
Polyamide resin (component B), α-olefin and α, β-
The resin composition comprising an olefin-based copolymer (component (C)) comprising an unsaturated glycidyl ester and 100 parts by weight of an epoxy resin (component (E)) in an amount of 1 to 30 parts by weight. 6. The polyester resin composition according to any one of items 5 to 5. 7. Thermoplastic polyester resin (A component) 9
5 to 10% by weight, 4 to 50% by weight of a polyamide resin (component B), and 1 to 40% by weight of an olefin copolymer (component C) composed of an α-olefin and an α, β-unsaturated glycidyl ester. And 100 to 100 parts by weight of a resin composition comprising: a resin composition prepared by mixing 0 to 150 parts by weight of a reinforcing filler (D component) and 1 to 30 parts by weight of an epoxy compound (E component). Automotive parts characterized by the above-mentioned.