JPH09241475A - Chemical-resistant thermoplastic resin composition and molded product therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition and molded product therefrom excellent in chemical resistance. SOLUTION: This chemical-resistance thermoplastic resin composition comprises (A) 1-80 pts.wt of a graft copolymer obtained by polymerizing 95-20 pts.wt. of a monomer mixture composed of 45-85wt.% of an aromatic vinyl compound, 15-55wt.% of a vinyl cyanide compound, 0-85wt.% of an α,β-unsaturated carboxylic ester compound and 0-40wt.% of other monomer(s) in the presence of 5-80 pts.wt. of a diene-based rubber 0.1-2.0μm in weight-average particle size, (B) 0-90 pts.wt. of a copolymer made from 45-85wt.% of an aromatic vinyl compound, 15-55wt.% of a vinyl cyanide compound, 0-85wt.% of an α,β-unsaturated carboxylic ester compound and 0-40wt.% of other monomer(s), and (C) 1-20 pts.wt. of an ethylene-vinyl acetate copolymer 1-200g/10min in MFR and 20-60wt.% in vinyl acetate content.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a chemical resistant thermoplastic resin composition having improved chemical resistance while maintaining excellent characteristics such as mechanical properties represented by impact resistance and molding processability, and The present invention relates to a molded product which is excellent in chemical resistance, particularly stress crack resistance in which stress cracking does not occur in a molded product when contacted with a chemical solution.

[0002]

2. Description of the Related Art Acrylonitrile is added to a diene rubber component.
The so-called ABS resin, which comprises a graft copolymer obtained by copolymerizing a vinyl cyanide compound such as methacrylonitrile and an aromatic vinyl compound component such as styrene and α-methylstyrene, has impact resistance, mechanical strength, and Due to its excellent molding processability, it is widely used for OA equipment and home appliances as a quasi-engineering plastic having intermediate properties between general-purpose resins and engineering plastics.

However, it is known that a molded article made of a rubber-reinforced styrene resin represented by ABS resin or the like is inferior in chemical resistance to a molded article made of another crystalline polymer or engineering plastic. Chemicals such as alcohols, hydrocarbons, esters, etc.
When it comes in contact with synthetic detergents or chemicals such as CFCs, gasoline, kerosene, brake oil and polyvinyl chloride plasticizer, crazes and cracks occur, so
In reality, it is restricted to be used in applications such as the sundries field and the automobile field.

Further, ABS resin is widely used for parts of heat insulating structures such as refrigerator inner boxes and door members, miscellaneous goods such as saucers for pachinko machines, and sanitary applications such as toilets and kitchens. As the foaming agent for the rigid urethane foam used as the heat insulating material in the heat insulating structure, a specific CFC-11 has been used in the past, but due to the ozone problem, CFC alternatives such as CFC-141b or cyclopentane are being replaced. . However, Freon-141b and cyclopentane have a problem in that they significantly invade the ABS resin as compared with the conventional Freon-11, and crazes and cracks occur in the molded product under a stress-loaded state.

Further, when a molded product made of ABS resin is applied to miscellaneous goods and sanitary applications, household or commercial detergents are used for cleaning the members, and these detergents may also be used for crazes and molded products. Cracks occur,
There was a problem that the product value was significantly impaired.

[0006] As means for improving such problems, the surface of the resin molded product is plated or painted,
Alternatively, a method of attaching a film or the like to prevent contact with chemicals, a method of increasing the molecular weight of the resin, a method of blending a crystalline resin, a method of increasing the copolymerization amount of acrylonitrile in the ABS resin, or a graft copolymer There are known methods for controlling the graft ratio of

However, the above-mentioned conventional techniques are not always sufficiently satisfactory in chemical resistance, and methods such as plating, painting, and film sticking are certainly effective in improving chemical resistance, but It cannot be said to be advantageous in terms of complication of the process, increase of cost and deterioration over time.
On the other hand, the method of increasing the molecular weight of the resin has a drawback that not only the effect of chemical resistance is small, but also the fluidity at the time of molding is deteriorated and the molding processability is significantly impaired.

Further, a method of blending a crystalline resin such as polybutylene terephthalate, polyamide and polypropylene having excellent chemical resistance (for example, JP-A-6-313).
No. 091 and Japanese Patent Laid-Open No. 6-329852), the compatibility between these crystalline resins and the ABS resin is insufficient, mechanical properties cannot be satisfied, and molding shrinkage increases. There was a problem.

Further, a method for defining the graft ratio of the graft copolymer of ABS resin (for example, Japanese Patent Laid-Open No. 4-2586).
19 and JP-A-5-78428) have a low effect of improving chemical resistance, and increase the amount of acrylonitrile copolymerized (JP-A-4-126756).
Is effective for improving the chemical resistance, but the increase in the amount of acrylonitrile causes problems such as heat coloring and deterioration of fluidity at the time of molding process, and thus has not yet solved the fundamental problem.

[0010]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the problems in the prior art described above.

Therefore, an object of the present invention is to provide a chemical resistant thermoplastic resin composition having improved chemical resistance while maintaining excellent properties such as mechanical properties represented by impact resistance and moldability. It is an object of the present invention to provide a molded article formed of this composition, which is excellent in chemical resistance, particularly stress crack resistance in which stress cracking does not occur in the molded article when contacted with a chemical solution.

In order to achieve the above object, the inventors of the present invention have conducted extensive studies on polymer components to be blended with a rubber-reinforced styrene resin, and as a result, have found that a rubber-reinforced styrene-based polymer using a rubber having a specific rubber particle size is used. By blending a resin with an ethylene / vinyl acetate copolymer having a specific composition and fluidity, chemical resistance is dramatically improved while maintaining excellent properties such as mechanical properties and moldability. The inventors have found that and reached the present invention.

[0013]

That is, the present invention provides an aromatic vinyl compound in the presence of 5 to 80 parts by weight of a diene rubber (A-1) having a weight average particle diameter of 0.1 to 2.0 μm. (A) 45 to 85% by weight, vinyl cyanide compound (B) 15 to 55% by weight, α, β-unsaturated carboxylic acid ester compound (C) 0 to 85% by weight, and other copolymerizable vinyl-based monomer 1 to 80 parts by weight of a graft copolymer (A) obtained by graft polymerization of 95 to 20 parts by weight of a monomer mixture (A-2) consisting of 0 to 40% by weight of the monomer (D), an aromatic vinyl compound (A) 45 to 85% by weight, vinyl cyanide compound (B) 15 to 55% by weight, α, β-unsaturated carboxylic acid ester compound (C) 0 to 85% by weight, and other copolymerizable vinyl-based monomer Quantity (D) 0-4
0 to 90 parts by weight of a copolymer (B) obtained by copolymerizing a monomer mixture of 0% by weight, and a melt flow rate of 1
~ 200g / 10min and vinyl acetate content is 2
1 to 20 parts by weight of an ethylene / vinyl acetate copolymer (C), which is 0 to 60% by weight, and comprises a graft copolymer (A), a copolymer (B) and an ethylene / vinyl acetate copolymer (C). The present invention provides a chemical-resistant thermoplastic resin composition characterized by a total of 100 parts by weight, and a molded article made of this composition.

The molded article of the present invention has a temperature of 23.degree.
It is characterized by having a critical strain for crack generation after contact with a chemical solution for at least 0.5% and having extremely excellent chemical resistance to chemicals such as hydrocarbons, halogenated hydrocarbons, ester compounds, ether compounds and alcohol compounds.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. Specific examples of the diene rubber (A-1) in the present invention include polybutadiene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, styrene-butadiene block copolymer, butyl acrylate-butadiene copolymer. And polyisoprene rubber. Among them, polybutadiene and styrene-
A butadiene copolymer is preferably used in terms of impact resistance.

The aromatic vinyl compound (a) in the monomer mixture (A-2) and the copolymer (B) monomer mixture in the present invention is styrene, α-methylstyrene,
Examples thereof include p-methylstyrene, vinyltoluene, t-butylstyrene, o-ethylstyrene, o-chlorostyrene and o, p-dichlorostyrene.
It is possible to use one kind or a combination of two or more kinds. Among them, styrene and α-methylstyrene are preferably used in terms of moldability.

Examples of the vinyl cyanide compound (B) in the monomer mixture (A-2) and the copolymer (B) of the present invention include acrylonitrile, methacrylonitrile and ethacrylonitrile. Among them, acrylonitrile is particularly preferably used in terms of chemical resistance.

The α, β-unsaturated carboxylic acid ester compound (c) in the monomer mixture (A-2) and the copolymer (B) monomer mixture in the present invention is (meth) acrylic acid. Methyl, ethyl (meth) acrylate, (meth)
N-propyl acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, n-hexyl (meth) acrylate, cyclohexyl (meth) acrylate,
Examples thereof include chloromethyl (meth) acrylate and 2-chloroethyl (meth) acrylate. Among them, methyl methacrylate is preferably used.

The other copolymerizable vinyl monomer (d) in the monomer mixture (A-2) and the copolymer (B) monomer mixture in the present invention is N-methylmaleimide. , N-cyclohexylmaleimide, maleimide compounds such as N-phenylmaleimide, unsaturated dicarboxylic acids such as maleic acid, unsaturated dicarboxylic acid anhydrides such as maleic anhydride, and unsaturated amide compounds such as acrylamide. Possible vinyl compounds may be mentioned, and these may be used alone or in combination of two or more.

The diene rubber (A-1) of the graft copolymer (A) in the present invention has a weight average particle diameter of 0.1 to 0.1.
It is necessary to be 2.0 μm, and 0.2 to 1.5 μm
m is preferred. When the weight average particle diameter is out of the range of 0.1 to 2.0 μm, sufficient chemical resistance and mechanical properties are not exhibited, which is not preferable.

The content of the diene rubber (A-1) in the graft copolymer (A) is required to be 5 to 80 parts by weight and 10
-60 parts by weight is preferred. When the content of the diene rubber (A-1) is less than 5 parts by weight, the impact resistance of the obtained chemical resistant thermoplastic resin composition is insufficient, and when it exceeds 80 parts by weight, the chemical resistance thermoplasticity obtained. This is not preferable because the moldability of the resin composition is reduced.

The aromatic vinyl compound (a), the vinyl cyanide compound (b) in the monomer mixture (A-2) of the graft copolymer (A) and the copolymer (B) in the present invention,
The composition ratio of the α, β-unsaturated carboxylic acid ester compound (c) and the other copolymerizable vinyl-based monomer (d) is such that (a) is 45 to 85% by weight, preferably 50 to 80% by weight.
%, (B) is 15 to 55% by weight, preferably 20 to
50% by weight, (c) 0 to 85% by weight, preferably 0
80% by weight, (D) 0-40% by weight, preferably 0-3
5% by weight.

Here, the monomer composition of the monomer mixture (A-2) and that of the copolymer (B) may be the same, or may be different as long as the mechanical properties are not impaired. .

Further, among the monomer mixture of the monomer mixture (A-2) and the copolymer (B), the vinyl cyanide compound (b) is an important monomer, Mixture (A
If the total amount of -2) is less than 15% by weight based on 100% by weight, crazes and cracks are likely to occur in the molded product when contacted with a chemical solution, which is not preferable. On the other hand, if it exceeds 55% by weight, not only the effect of improving chemical resistance gradually decreases, but also disadvantages such as thermal coloring and fluidity during molding are markedly deteriorated, which is not preferable.

The method of producing the copolymer (A) may be any polymerization method such as emulsion polymerization, suspension polymerization and bulk suspension polymerization, and is not particularly limited. The method for producing the copolymer (B) may be any polymerization method such as emulsion polymerization, suspension polymerization, bulk polymerization, bulk suspension polymerization and solution polymerization, and is not particularly limited. Further, in the above-mentioned polymerization method, the charging method of the monomers is not particularly limited, and the polymerization may be carried out by initial batch charging, or one of the charged monomers may be added in order to suppress the formation of the composition distribution of the copolymer. Polymerization may be carried out while charging all or part of them continuously or separately.

The ethylene / vinyl acetate copolymer (C) in the present invention is obtained by copolymerizing ethylene and vinyl acetate by a known polymerization method, and contains 40 to 80% by weight of ethylene, preferably 50 to 75% by weight. %, Vinyl acetate is 20
-60% by weight, preferably 25-50% by weight. Here, the copolymerization ratio of vinyl acetate in the ethylene / vinyl acetate copolymer (C) is 60.
If it exceeds 20% by weight, the mechanical strength of the chemical-resistant thermoplastic resin composition is significantly reduced, and if it is less than 20% by weight, the resulting chemical-resistant thermoplastic resin composition has insufficient impact resistance.
It is not preferable because it tends to cause delamination.

Further, the ethylene / vinyl acetate copolymer (C) is used in accordance with the method of JIS K6730.
The melt flow rate measured under the conditions of C and 2.16 Kg is 1 to 200 g / 10 minutes, preferably 3 to 180 g /
It is important that the time is 10 minutes, and if the melt flow rate is less than 1 g / 10 minutes, the impact resistance of the chemical resistant thermoplastic resin composition and the molded article will be reduced, and if it exceeds 200 g / 10 minutes, the tensile yield strength will be increased. It is not preferable because it tends to decrease.

The blending ratio of each component in the chemical resistant thermoplastic resin composition of the present invention is 1 for the graft copolymer (A).
To 80 parts by weight, preferably 5 to 70 parts by weight, the copolymer (B) is 0 to 90 parts by weight, preferably 5 to 80 parts by weight,
The ethylene / vinyl acetate copolymer (C) comprises 1 to 20 parts by weight, preferably 2 to 15 parts by weight, and the graft copolymer (A), the copolymer (B) and the ethylene / vinyl acetate copolymer. It is necessary that the total of (C) be 100 parts by weight.

The blending ratio of the graft copolymer (A) is 80.
If it exceeds 1 part by weight, the rigidity and fluidity are deteriorated, and if it is less than 1 part by weight, sufficient impact resistance is not exhibited, which is not preferable. On the other hand, if the mixing ratio of the copolymer (B) exceeds 90 parts by weight, sufficient impact resistance will not be exhibited, which is not preferable. Further, when the blending ratio of the ethylene / vinyl acetate copolymer (C) is less than 1 part by weight, sufficient chemical resistance is not exhibited, and when it exceeds 20 parts by weight, not only the rigidity and fluidity are deteriorated but also the layered structure is obtained. It is not preferable because it tends to cause peeling.

Next, regarding the method for producing the thermoplastic resin composition of the present invention, regarding the blending and melt extrusion of the graft copolymer (A), the copolymer (B) and the ethylene / vinyl acetate copolymer (C). Is not particularly limited, and a generally known method can be adopted. That is, when blending the graft copolymer (A), the copolymer (B) and the ethylene / vinyl acetate copolymer (C), for example, a ribbon blender, a V-type blender, a Henschel mixer and the like can be used. . Then, it can be melt-kneaded and extruded using a Banbury mixer, a mixing roll, a pressure kneader, and an extruder such as a single-screw or multi-screw extruder.

In the chemical resistant thermoplastic resin composition of the present invention, polyvinyl chloride, polyolefins such as polyethylene and polypropylene, polyamides such as nylon 6 and nylon 66, polyethylene and the like are used in the range not impairing the object of the present invention. By blending polyesters such as terephthalate, polybutylene terephthalate, and polycyclohexanedimethyl terephthalate, polycarbonate, and various elastomers, the performance as a molding resin can be further improved.

Further, the chemical resistant thermoplastic resin composition of the present invention contains, if necessary, an antioxidant such as a hindered phenol type, a sulfur-containing organic compound type or a phosphorus containing organic compound type.
Phenol-based and acrylate-based heat stabilizers, benzotriazole-based, benzophenone-based, salicylate-based UV absorbers, organic nickel-based, hindered amine-based light stabilizers and other various stabilizers, higher fatty acid metal salts, high-grade Lubricants such as fatty acid amides, plasticizers such as phthalic acid esters and phosphoric acid esters, halogen-containing compounds such as polybromodiphenyl ether, tetrabromobisphenol-A, brominated epoxy oligomers and brominated polycarbonate oligomers, phosphorus compounds Flame retardants / flame retardants such as antimony trioxide, carbon black, titanium oxide, pigments and dyes may also be added. Further, reinforcing agents and fillers such as glass fibers, glass flakes, glass beads, carbon fibers and metal fibers may be added to the chemical resistant thermoplastic resin composition of the present invention.

The chemical resistant thermoplastic resin composition obtained as described above is a known method currently used for molding thermoplastic resins such as injection molding, extrusion molding, blow molding, vacuum molding, compression molding and gas assist molding. It can be molded by, and is not particularly limited.

The molded article of the present invention thus molded has a temperature of 23 ° C. and 24 ° C. in order to maximize its chemical resistance.
The critical strain for crack generation after contact with the chemical solution for 0.5 hours is 0.5% or more, preferably 0.6% or more, more preferably 0.8%
It is necessary to be above, and if it is less than 0.5%, the effect of improving the chemical resistance is small, which is not preferable.

The molded article of the present invention is preferably used in applications where chemical resistance is required. Then, the molded article of the present invention is a hydrocarbon, a halogenated hydrocarbon, an ester compound,
Various organic compounds such as ether compounds and alcohol compounds, more specifically hydrocarbons having 4 to 20 carbon atoms,
Freon, gasoline, kerosene, brake oil, polyvinyl chloride plasticizer (eg phthalic acid dialkyl ester,
It exhibits excellent chemical resistance to detergents containing phthalic acid alkyl ester) and nonionic surfactants and anionic surfactants.

The molded article obtained from the chemical resistant thermoplastic resin composition of the present invention has remarkably improved chemical resistance while maintaining excellent properties such as mechanical properties represented by impact resistance and moldability. Therefore, it can be widely used for applications such as electricity, electronics, automobiles, machinery, sundries, chemical plants, aviation and space parts, materials, etc. -It can be suitably used for housing of electronic products and structural parts of refrigerators, miscellaneous goods such as saucers for pachinko, sanitary applications such as toilets and kitchens, and interior and exterior materials for automobiles.

[0037]

EXAMPLES In order to more specifically describe the present invention, examples and comparative examples will be described below, but these examples do not limit the present invention. Here, unless otherwise specified, "%" represents% by weight and "parts" represents parts by weight.

The resin characteristics of the chemical resistant thermoplastic resin composition were measured according to the analysis method shown below. In addition, with regard to general properties such as mechanical strength and heat resistance of the molded product, a test piece was molded by injection molding and measured according to the following test method. Rubber particle size: Sodium alginate method Reduced viscosity: Methyl ethyl ketone solution (0.4 g / dl)
30 ° C. Melt flow rate: JIS K6730 (190 ° C.,
2.16 Kg) Tensile yield strength: ASTM D638 (23 ° C) IZOD impact strength: ASTM D256 (23 ° C with 1/2 inch notch) Chemical resistance test: Injection molded strip test piece (126 x 1)
(2.6 × 1.5 mm) is fixed along the 1/4 elliptical jig shown in FIG. 1, a chemical solution is applied to the surface of the test piece, and left at 23 ° C. for 24 hours, and then checked for cracks. Then, the critical strain (%) was calculated from the following formula (1).

[0039]

[Equation 1] [Reference Example 1] Production method of graft copolymer (A) A1 120 parts of pure water and 0.5 glucose in a reactor substituted with nitrogen.
Part, sodium pyrophosphate 0.5 part, ferrous sulfate 0.0
05 parts and the predetermined amount of polybutadiene latex shown in Table 1 were charged, and the temperature in the reactor was adjusted to 65 ° C while stirring.
The temperature rose. When the internal temperature reached 65 ° C., polymerization was started, and a predetermined amount of a mixture of monomers and t-dodecyl mercaptan shown in Table 1 was continuously added over 5 hours. At the same time, in parallel, an aqueous solution containing cumene hydroperoxide and potassium oleate shown in Table 1 was continuously added over 7 hours to complete the reaction. In the obtained latex,
2,2′-methylenebis (4-methyl-6-t-butylphenol) was added in an amount of 1 part by weight to 100 parts by weight of the latex solid content, and subsequently the latex was coagulated with sulfuric acid and then added with sodium hydroxide. The mixture was hydrated, washed, filtered, and dried to obtain a powdery graft copolymer A1.

Reference Examples 2 to 6 Preparation Method of Graft Copolymer (A) A2 to A6 In the same manner as in Reference Example 1, graft copolymers A2 to A6 were obtained at the composition ratios shown in Table 1.

Reference Example 7 Copolymers (B) B1 to B6
The copolymers B1 to B6 having the reduced viscosities shown in Table 2 were obtained with the composition ratios and polymerization methods shown in Table 2.

Reference Example 8 Ethylene / vinyl acetate copolymer (C) C1 to C5 The following copolymers C1 to C5 were prepared. C1: ethylene / vinyl acetate copolymer "EVAFLEX" EV45LX manufactured by Mitsui-DuPont Polychemical Co., Ltd. vinyl acetate content: 45% melt flow rate: 2.5 g / 10 minutes C2: ethylene / vinyl acetate manufactured by Mitsui-Dupont Polychemical Co., Ltd. Copolymer "EVAFLEX" EV45X Vinyl acetate content: 45% Melt flow rate: 90 g / 10 minutes C3: Mitsui DuPont Polychemical Co. ethylene / vinyl acetate copolymer "EVAFLEX" EV460 Vinyl acetate content: 19% Melt Flow rate: 2.5 g / 10 minutes C4: Mitsui DuPont Polychemical Co. ethylene / vinyl acetate copolymer "EVAFLEX" EV290 Vinyl acetate content: 28% Melt flow rate: 0.1 g / 10 minutes C5: Mitsui DuPont Polychemical Co. Ethylene / Vinegar Vinyl acetate copolymer "EVAFLEX" V5411 Vinyl acetate content: 28% Melt flow rate: 300 g / 10 minutes

Examples 1 to 4 Production of Chemical-Resistant Thermoplastic Resin Composition and Molded Article Graft copolymer (A), copolymer (B), ethylene / vinyl acetate copolymer ( C) was blended in the proportions shown in Table 3, and then melt-kneaded with a 40 mmφ single-screw extruder (cylinder setting temperature was 230 ° C.) to obtain a pellet-shaped chemical resistant thermoplastic resin composition. Injection molding machine IS-50A manufactured by Toshiba Machine Co., Ltd.
Was used to mold a test piece, various properties of this molded product were evaluated, and the results are shown in Table 3.

[Comparative Examples 1 to 10] Production of chemical resistant thermoplastic resin composition and molded article Graft copolymer (A), copolymer (B), ethylene / vinyl acetate copolymer ( C) was blended in the proportions shown in Table 3, and then melt-kneaded with a 40 mmφ single-screw extruder (cylinder setting temperature was 230 ° C.) to obtain a pellet-shaped chemical resistant thermoplastic resin composition. A test piece was molded from the obtained pellet using an injection molding machine IS-50A manufactured by Toshiba Machine Co., Ltd., and various characteristics of this molded product were evaluated, and the results are also shown in Table 3.

[0045]

[Table 1]

[Table 2]

[Table 3] From Examples 1 to 4, it is clear that the chemical resistant thermoplastic resin composition and the molded product having the compounding ratios defined in the present invention have excellent tensile yield strength, impact strength and chemical resistance.

However, in Comparative Examples 1 to 3, the blending ratios of the graft copolymer (A), the copolymer (B) and the ethylene / vinyl acetate copolymer (C) are out of the specified range of the present invention. Therefore, Comparative Examples 1 and 3 have low tensile yield strength, and Comparative Example 2
Has poor chemical resistance. Further, in Comparative Examples 4 to 10, at least one of the graft copolymer (A), the copolymer (B) and the ethylene / vinyl acetate copolymer (C) does not satisfy the requirements of the present invention. Comparative Examples 4 and 10 have low tensile yield strength, Comparative Example 5 has poor chemical resistance, and Comparative Examples 6 to 9 have poor impact strength.

[0047]

As described above, the chemical resistant thermoplastic resin composition of the present invention and the molded article comprising the composition are the rubber-reinforced styrene resin using the rubber of the specific rubber particle diameter, Ethylene with composition and fluidity of
By combining vinyl acetate copolymers at a specific ratio, crazes and cracks will occur in the molded product when it comes in contact with chemicals while maintaining various excellent properties such as mechanical properties and molding processability. It has excellent chemical resistance.

Therefore, the chemical-resistant thermoplastic resin composition of the present invention and the molded article made of the composition make use of these characteristics, and make use of these characteristics, the resin material for electric refrigerators and the resin material for equipment that comes into contact with parts or detergents. And, it can be suitably applied to applications such as parts thereof.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a 1/4 elliptical jig used in a chemical resistance test in Examples.

Claims (5)

[Claims] 1. In the presence of 5 to 80 parts by weight of a diene rubber (A-1) having a weight average particle diameter of 0.1 to 2.0 μm, 45 to 85% by weight of an aromatic vinyl compound (a), Vinyl cyanide compound (b) 15 to 55% by weight, α, β-unsaturated carboxylic acid ester compound (c) 0 to 85% by weight, and other copolymerizable vinyl monomers (d) 0 to 4
1 to 80 parts by weight of a graft copolymer (A) obtained by graft-polymerizing 95 to 20 parts by weight of a monomer mixture (A-2) consisting of 0% by weight, and an aromatic vinyl compound (a) 45 to 85 parts by weight. %, Vinyl cyanide compound (b) 15 to 55% by weight, α, β-unsaturated carboxylic acid ester compound (c) 0 to 85% by weight, and other copolymerizable vinyl monomer (d) 0 to Copolymer (B) obtained by copolymerizing 40% by weight of a monomer mixture.
0 to 90 parts by weight and a melt flow rate of 1 to 20
0 g / 10 minutes and vinyl acetate content of 20 to 6
0% by weight of ethylene / vinyl acetate copolymer (C) 1
To 20 parts by weight, and the total amount of the graft copolymer (A), the copolymer (B) and the ethylene / vinyl acetate copolymer (C) is 100 parts by weight. Resin composition. 2. A molded article obtained by molding the chemical resistant thermoplastic resin composition according to claim 1. 3. The molded article according to claim 2, wherein the critical strain for crack generation after contact with a chemical solution at 23 ° C. for 24 hours is 0.5% or more. 4. The molded article according to claim 2, which has excellent chemical resistance to at least one selected from hydrocarbons, halogenated hydrocarbons, ester compounds, ether compounds and alcohol compounds. 5. A hydrocarbon having 4 to 20 carbon atoms, CFCs,
The molded article according to any one of claims 2 to 4, which has excellent chemical resistance to at least one selected from gasoline, kerosene, brake oil, polyvinyl chloride plasticizer, and detergent.