JPH04154858A - Fluorocarbon-resistant thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain a thermoplastic resin composition excellent in fluorocarbon resistance and suitable as inner boxes in refrigerators by blending a specific high-nitrile resin with a specified fatty acid compound. CONSTITUTION:The objective resin composition is obtained by blending 100 pts.wt. total amount of (A) 25-60 pts.wt. graft copolymer prepared by polymerizing (A2) 30-80wt.% monomer mixture composed of 50-80wt.% vinyl cyanide monomer and 20-50wt.% aromatic vinyl monomer, in the presence of (A1) 20-70wt.% conjugated diene-based synthetic rubber and (B) 40-75 pts.wt. copolymer composed of 50-80wt.% vinyl cyanide monomer and 20-50wt.% aromatic vinyl monomer with (C) 1-10 pts.wt., preferably 2-5 pts.wt. higher fatty acid triglyceride which is a triester of an 8-31C higher fatty acid with glycerol.

Description

[Detailed description of the invention] [Background of the invention] <Industrial application field of the invention> The present invention relates to a thermoplastic resin having excellent fluorocarbon resistance.

More specifically, the present invention improves fluorocarbon resistance, especially H
This article concerns the secret behind the refrigerator's high stress crack resistance compared to CFC-123. In the present invention, the term "refrigerator inner box" includes the interior of the refrigerator.

<Prior art> Recent refrigerator boxes are made by injecting a rigid polyurethane foam stock solution into the space between the inner and outer boxes and foaming and solidifying them (hereinafter referred to as 1n-situ foaming). It is formed as an insulated box by the method (referred to as the method). Furthermore, in the case of a refrigerator door, the space formed by combining the interior and outer boxes is filled with rigid polyurethane foam using the 1N-situ foaming method to serve as a heat insulator.

Conventionally, general-purpose ABS resin has been mainly used for the inner box of refrigerators. Here, general-purpose ABS resin is made by polymerizing a monomer mixture of 10 to 40% by weight of vinyl cyanide compound and 60 to 90% by weight of aromatic vinyl compound in the presence of conjugated diene-based synthetic rubber. The resin composition obtained by graft copolymerization or this graft copolymer has a vinyl cyanide compound content of 10 to 10%.
It refers to a resin composition containing 40% by weight of a vinyl cyanide compound/aromatic vinyl compound copolymer.

The reasons why ABS resin has been used for the inner box of refrigerators include its high physical property balance between rigidity and impact resistance, easy moldability, excellent glossy appearance, fluorocarbon, which is a blowing agent for rigid polyurethane foam, That is, CFC-11 (
It has stress crack resistance against trichloromonofluoromethane). Since the inner box of a refrigerator is manufactured by thermoforming a flat plate of thermoplastic resin, for example, by vacuum forming, it is necessary that the molding process, particularly vacuum forming, be easily performed. Furthermore, since the average thickness of the inner box obtained by vacuum forming is less than 1 mm, a high elastic modulus is required to avoid deformation. AB
When rigid polyurethane foam is filled using the 1n-sltu foaming method into the space formed by combining the inner box made of S resin and the outer box made of iron plate, the rigid polyurethane foam becomes AB.
Since it is bonded to the S resin and the iron plate, stress occurs due to the difference in linear expansion coefficient and temperature difference between the iron plate/rigid polyurethane foam/ABS resin when the refrigerator is operated. Therefore, it is necessary for the inner box to have stress crack resistance against -3=CFC-11, which is a blowing agent for rigid polyurethane foam. In addition, the inner box must have a high notch impact value because the rigid polyurethane foam creates a notch effect due to adhesion. Moreover, a good gloss is necessary to improve the appearance of the refrigerator.

<Problem to be solved by the invention> CFC-11, a blowing agent for rigid polyurethane foam
Because it contains chlorine and is difficult to decompose, it is suspected of destroying the stratospheric ozone layer, and its use is being restricted worldwide. HCFC as a blowing agent for rigid polyurethane foam instead of CFC-11
-123(1-hydro-1,1-dichloro-2,2,
2-trifluoroethane) is about to be used, but
Since the dissolving power for ABS resin is much higher than that of CFC-11, refrigerator ABS filled with rigid polyurethane foam using 1N-sou foaming method using HCFC-123.
The inner box made of resin easily crazes or cracks under stress, thereby eliminating the commercial value of the refrigerator. Therefore, under these trends, it is necessary to have stress crack resistance compared to HCFC-123, and at the same time, as before, it has a high physical property balance of rigidity and impact resistance, easy moldability, and excellent gloss. It is necessary to make the inner box and door bag of the refrigerator using a material that has an appearance.

[Summary of the invention]

Means for Solving the Problems> The present invention aims to provide a solution to the above-mentioned problems, and attempts to achieve this objective by a thermoplastic resin composition formed by blending a specific fatty acid compound with a specific high nitrile resin. That is.

That is, the fluorocarbon-resistant thermoplastic resin composition according to the present invention is a composition 1 containing the following components A and B.
00 parts by weight is blended with component C consisting of 1 to 10 parts by weight of higher fatty acid triglyceride.

Component A conjugated diene synthetic rubber in the presence of 20 to 70% by weight
A graft copolymer obtained by polymerizing 30 to 80% by weight of a monomer mixture consisting essentially of ~80% by weight of vinyl cyanide monomer and 20 to 50% by weight of aromatic vinyl monomer. .

25-60 parts by weight Component B A copolymer containing 50-80% by weight of vinyl cyanide monomer and 20-50% by weight of aromatic vinyl monomer.

40-75 parts by weight Effect〉 According to the present invention, the above objects are achieved.

That is, since the fluorocarbon-resistant thermoplastic resin composition of the present invention is highly resistant to various fluorocarbons, particularly fluorocarbon HCFC-123, the inner box of a refrigerator made from this composition is not subject to the fluorocarbon regulations. HCFC-1
It is free from the problems caused by 23.

Although the fluorocarbon-resistant thermoplastic resin composition according to the present invention is basically a blend of so-called ABS resin and so-called AS resin, the composition of the present invention has the advantage that each resin has a high nitrile content. Unlike these commonly used resins, even with such a high nitrile content, the composition according to the present invention has a high physical property balance between rigidity and impact resistance, and easy molding process. The molded articles made from it, such as refrigerator inner boxes, have an excellent glossy appearance.

[Detailed description of the invention]

Resin Component/Components A, B> Component A/ABS Resin> Component A, which is one of the main resin components of the thermoplastic resin composition according to the present invention, is a so-called ABS resin.

However, this ABS resin is distinguished from commonly used ABS resins in that it has a high nitrile content and a high rubber content, and the three basic components of this ABS resin are typically acrylonitrile, butadiene, and styrene. However, it is not limited to these.

That is, component A in the composition of the present invention is a monomer mixture consisting essentially of a vinyl cyanide monomer and an aromatic vinyl monomer in the presence of a conjugated diene synthetic rubber. It is a graft copolymer obtained by polymerization.

(a) Conjugated diene-based synthetic rubber The conjugated diene as the "stem polymer" of the graft copolymer provides the thermoplastic resin composition used in the present invention with the impact resistance necessary as a material for refrigerator inner boxes. It is a synthetic rubber.

Conjugated diene synthetic rubber is a homopolymer of conjugated diene, which owes at least a large part of its rubber elasticity to conjugated diene.
It means either a copolymer of a conjugated diene, or a random copolymer or a block copolymer of a conjugated diene and another comonomer.

Specifically, for example, conjugated diene synthetic rubbers include polybutadiene, polyisoprene, polychloroprene, butadiene-styrene copolymer, butadiene-acrylonitrile copolymer, and the like. Polybutadiene, butadiene-styrene copolymers and butadiene-acrylonitrile copolymers are preferably used. These can be used together.

Conjugated diene synthetic rubber is related to the thermoplastic resin composition of the present invention as a graft copolymer having it as a backbone polymer, but this graft copolymer has a predetermined monomer content in the latex of the conjugated diene synthetic rubber. It is usually produced by emulsion polymerization. In that case, the latex of the conjugated diene-based synthetic rubber has synthetic rubber particles with a particle size of 0.
．． Preferably, the thickness is in the range of 0.01 to 10 μm.

The particle diameter of the particularly preferable synthetic rubber is 0.1 to 0. 5 μm
If a synthetic rubber latex with a particle size within this range is used, a high balance of physical properties can be achieved.

(b) Vinyl cyanide monomer 1 One of the monomers to form the branched polymer is a vinyl cyanide compound. In this specification, "vinyl cyanide monomer" and "vinyl cyanide compound" are treated as having the same meaning.

The vinyl cyanide compound referred to in the present invention includes acrylonitrile, methacrylonitrile, etc., and acrylonitrile is preferably used. These can be used together.

Other monomeric aromatic vinyl compounds to form branched polymers include styrene, core and/or side chain substituted styrenes such as α-methylstyrene, p-methylstyrene, vinyltoluene, etc. . Among these, styrene is preferably used. These can be used together. Note that in this specification, "aromatic vinyl monomer" and "aromatic vinyl compound" are treated as having the same meaning.

The total amount of the monomer mixture used in the graft copolymer of the present invention is 50 to 80% by weight, preferably 50 to 65% by weight, vinyl cyanide compound and 20 to 50% by weight, preferably 35 to 50% by weight. , an aromatic vinyl compound. 50% by weight of vinyl cyanide compound
If the stress crack resistance against HCFC-123 becomes insufficient, on the other hand, if the vinyl cyanide compound
If it exceeds % by weight, ease of molding processability will be lost.

In addition to the above-mentioned two components, the monomers to form the branched polymer in the present invention may contain a small amount of other comonomers that can be copolymerized. This is why the monomer in the present invention is defined as "consisting essentially of vinyl cyanide monomer and vinyl aromatic monomer." Specific examples of such comonomers include esters of acrylic acid or methacrylic acid (for example, C1
~C6 alkyl esters, e.g. methyl, ethyl, cyclohexyl esters), vinyl esters (e.g.
vinyl acetate), and others.

(c) Production of graft copolymer As mentioned above, the graft copolymer of component A in the present invention is generally characterized by a high rubber content in addition to a high nitrile content. .

Therefore, this graft copolymer is prepared by mixing 30 to 80% of a monomer mixture in the presence of 20 to 70% by weight of a conjugated diene synthetic rubber.
It was obtained by polymerizing % by weight.

The graft copolymer in the present invention is usually produced by an emulsion polymerization method. Molecular weight regulators, initiators, and emulsifiers that are commonly used in emulsion polymerization methods can be used. For example, molecular weight regulators include mercaptans, initiators include organic peroxides and persulfates, and emulsifiers include fatty acid salts and alkyl sulfates. Ester salts, alkylbenzene sulfonates, and alkyldiphenyl ether disulfonates are used.

A preferred graft polymerization is as follows.

That is, conjugated diene synthetic rubber latex, emulsifier,
A predetermined amount of an initiator and water are charged into a polymerization tank, and while stirring under a nitrogen stream, the monomer mixture is divided into two parts, and at a predetermined temperature, 51 to 84% by weight of vinyl cyanide compound and 16 to 49% by weight of vinyl aromatic compound are prepared. A first-stage monomer (mixture) consisting of 90 to 98% by weight (the total with the second-stage monomer described later is 100% by weight) and a predetermined amount of a molecular weight regulator for a predetermined period of time. After the addition of the first stage monomer mixture is completed, 2 to 10% by weight of the second stage monomer consisting of an aromatic vinyl compound is added at a predetermined temperature. The total amount with the first stage monomer (mixture) is 100% by weight.
) is continuously added within a predetermined period of time to complete the graft copolymerization. At this time, in parallel with the progress of the graft copolymerization, a predetermined amount of initiator and a predetermined amount of water are continuously added within a predetermined time. It is desirable to adopt a polymerization method in which the composition of the monomer mixture that is continuously added during graft copolymerization is changed in this way in order to maintain good stability of the high nitrile resin latex during and after polymerization. Here, the addition time of the first-stage monomer mixture is desirably 2 hours or more in order to make the composition of the resulting graft copolymer uniform. The addition time of the second stage monomer is preferably 20 minutes or more in order to effectively stabilize the high nitrile resin latex. The temperature at which the graft copolymerization is carried out with the emulsifier, initiator, and molecular weight regulator depends on the type of synthetic rubber, particle size and amount charged, the composition of the monomer mixture used in the graft copolymerization, and the resulting graft copolymerization. It is determined by the target values for the grafting rate and molecular weight of the conjugate. The resulting graft copolymer is coagulated, washed with water, and dried using a method commonly used in emulsion polymerization.

(d) Graft rate etc. The graft copolymer of the present invention preferably satisfies the following conditions.

0.30≦(G-R)/R≦0.50 G: Weight percentage of the gel obtained by dissolving the graft copolymer in acetonitrile and then performing solid-liquid separation using a centrifuge R: Graft copolymer rubber content.

The value of (G-R)/R (hereinafter referred to as graft ratio) is 0
．． When the graft ratio is less than 30, a high physical property balance between rigidity and impact resistance cannot be obtained, and on the other hand, when the graft ratio exceeds 0.50, there is a tendency that ease of molding processability is lost.

The molecular weight of the graft copolymer in the present invention is expressed using the specific viscosity (hereinafter referred to as specific viscosity) measured using a viscometer after dissolving 0.1 g of the acetonitrile-soluble portion of the graft copolymer in 100 ml of dimethylformamide. In this case, it is preferable for the specific viscosity to be in the range of 0.04 to 0.09 in order to achieve easy molding processability.

Component B/AS resin> In the present invention, the vinyl cyanide compound/aromatic vinyl compound copolymer to be blended as component B with the high nitrile (and generally high rubber) graft copolymer has a content of 50 to
80% by weight, preferably 50-65% by weight of vinyl cyanide compound and 20-50% by weight, preferably 35-5% by weight.
0% by weight of an aromatic vinyl compound. If the vinyl cyanide compound is less than 50% by weight, HCF
The stress crack resistance against C-123 is insufficient, and on the other hand, if the vinyl cyanide compound exceeds 80% by weight, ease of molding processability is lost.

The vinyl cyanide compound/aromatic vinyl compound copolymer is usually produced by a suspension polymerization method.

Molecular weight regulators, initiators, suspension stabilizers, suspension stabilization aids are
Commonly used suspension polymerization methods can be used, for example,
Mercaptans and terpenes are used as molecular weight regulators, azo compounds are used as initiators, polyvinyl alcohol and acrylic acid copolymers are used as suspension stabilizers, and salts are used as suspension stabilizers. The polymerization method is also a common suspension polymerization method,
A monomer mixture, a molecular weight regulator, a suspension stabilizer, a suspension stabilizing aid, and water are put into a polymerization tank in specified amounts, and while stirring under a nitrogen stream, an initiator is injected at a specified temperature to start copolymerization. Immediately thereafter, monomers are continuously added so that the composition of the monomer mixture in the polymerization tank becomes constant to terminate the copolymerization. Here, the charging composition of the monomer mixture and the molecular weight regulator,
The amount of the suspension stabilizer and suspension stabilizing aid is determined by the vinyl cyanide compound/aromatic vinyl compound composition ratio and the target value for the molecular weight of the copolymer to be produced. The produced vinyl cyanide compound/aromatic vinyl compound copolymer is washed and dried by extracting unreacted monomers by a method commonly used in suspension polymerization.

In the present invention, the molecular weight of the vinyl cyanide compound/aromatic vinyl compound copolymer has a specific viscosity of 0.04 to 0.09.
It is preferable that the value be within the range of 1 to 1 to achieve easy molding processability.

Note that the above description regarding the vinyl cyanide compound, the aromatic nitrile compound, and the "monomer mixture essentially consisting of these" also applies to this AS resin.

Rubber content, etc.> The high nitrile thermoplastic resin composition of the present invention has a rubber content of 10 to 2 to obtain physical properties suitable for the inner box of a refrigerator.
Preferably, it is 0% by weight.

If the rubber content is less than 10% by weight, the impact resistance will be insufficient and cracks will tend to occur when the contents of the refrigerator hit, etc. On the other hand, if the rubber content is more than 20% by weight, the rigidity will be insufficient. This tends to cause deformation of vacuum-formed products.

In order to make the rubber content of the high nitrile thermoplastic resin composition a predetermined value, e.g. 10 to 20% by weight, component A and component B are combined.
Generally, when blending component A and component B in the present invention, the ratio of vinyl cyanide compound/aromatic vinyl compound in the graft copolymer and vinyl cyanide compound/vinyl cyanide compound/ The difference in the ratio of vinyl cyanide compound/aromatic vinyl compound in the aromatic vinyl compound copolymer is preferably within 10% by weight. If this difference is large, the uniformity obtained by mixing will decrease, making it impossible to obtain a high balance of physical properties. On the other hand, as long as the molecular weight of the graft copolymer and the molecular weight of the vinyl cyanide compound/aromatic vinyl compound copolymer are within the above-mentioned ranges and have the desired physical properties and moldability, any A combination is also possible.

Component C/Higher Fatty Acid Compound> According to the present invention, the higher fatty acid compound (component C) blended into the resin component is a higher fatty acid triglyceride.

In the present invention, the higher fatty acid triglyceride preferably has a higher fatty acid having a carbon number of 8 to 31. That is, since triglycerides in which higher fatty acids have less than 8 carbon atoms are volatile, molded products made from the composition of the present invention containing them tend to have poor surface appearance. This is because when a triglyceride of a higher fatty acid having more than 31 carbon atoms is used, the moldability (fluidity) of the resulting resin composition tends to decrease.

Specifically, higher fatty acids include (a) caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid,
Stearic acid, behenic acid, montanic acid, etc. have 8 or more carbon atoms
Higher saturated fatty acids in the range of 31 and (b)undecylenic acid, oleic acid, erucic acid, linoleic acid, etc. with 8 carbon atoms
and 31 higher unsaturated fatty acids. Preferred higher fatty acids have 8 to 31 carbon atoms, preferably 10 to 31 carbon atoms.
It is a higher saturated fatty acid in the range of 22. Note that when triglycerides of higher unsaturated fatty acids are used, their uses are limited because they may impair the weather resistance of the resin composition.

That is, use near a light source or germicidal lamp is often undesirable because it may cause discoloration and/or deterioration of physical properties of the resin composition.

These higher fatty acids may be used alone or in a mixture of two or more. Here, the term "mixture" refers to cases where triglyceride is composed of multiple types of fatty acids (of course up to 3 types), and cases where it is a mixture of multiple types of triglycerides made up of a single type of fatty acid. It encompasses the following.

The resin composition according to the present invention is made by blending 1 to 10 parts by weight of higher fatty acid triglyceride (component C) with 100 parts by weight of the resin composition consisting of components A and B described above. The amount of higher fatty acid triglyceride blended is preferably 2 to 5 parts by weight.

If the amount of higher fatty acid triglyceride is less than 1 part by weight, the high impact resistance of the resulting resin composition will be little improved;
If it exceeds 0 parts by weight, heat resistance and rigidity will decrease.
Neither is preferable.

Formation of Composition> The thermoplastic resin composition targeted by the present invention can be produced by any means capable of uniformly kneading the given components, preferably by means involving softening or melting of the resin components. be able to.

For mixing, a single screw extruder, a twin screw extruder, a Banbury mixer, a kneader, and other devices commonly used for melt mixing of resins can be used.

At this time, additives such as antioxidants, ultraviolet absorbers, lubricants, and antistatic agents, and colorants may be added.

Molding of Refrigerator Inner Box, etc.> The high nitrile thermoplastic resin composition of the present invention is formed into the inner box and door interior of a refrigerator by a general method for producing an inner box of a refrigerator. Generally, a resin composition is melted and formed into a flat plate using an extruder equipped with a coat hanger die, and then cooled and solidified using a roll. The flat plates are then formed into refrigerator inner boxes and door inner boxes using a vacuum forming machine.

It goes without saying that it is also possible to produce molded products other than refrigerator inner boxes.

Experimental Examples The following Examples and Comparative Examples are for specifically explaining the present invention. The present invention is not limited to the following examples unless it exceeds the gist thereof.

Reference example (1) Production of graft copolymer (component A) (a) Production of diene rubber latex 1.3-Butadiene 90 parts by weight Styrene 10 Fatty acid soap 4 Potassium persulfate
0.1511 t-Dodecyl mercaptan 0.311 Deionized water 1
55. Charge the mixture consisting of the above components into a stainless steel reactor and heat to 68°C while stirring under a nitrogen atmosphere.
The reaction was continued for 6 hours. Thereafter, the temperature was raised from 68°C to 80°C over 1.5 hours, and the reaction was continued at 80°C for an additional 2.5 hours, and then cooled to complete the reaction.

The solid content concentration of the obtained latex was 39.9%.

(b) Production of graft copolymer (component A) Diene-based rubber latte/socks of (a) above 50 parts by weight - 4° Sodium alkyl diphenyl ether disulfonate 2 parts by weight Deionized water 200 ll Potassium persulfate 0.085' The above components were placed in a flask, maintained at 65° C. while stirring under a nitrogen stream, and the following first-stage monomer mixture was continuously added over 4 hours.

Acronitrile 27.5 parts by weight Styrene 19.2" n-dodecyl mercaptan 1.15 After adding the first stage monomer mixture, keep the reaction system at 65°C and add 1 part of the following second stage monomer. It was added continuously over time.

Styrene 3.3 parts by weight Thirty minutes after the start of addition of the first-stage monomer mixture, the following initiator was continuously added as a deionized aqueous solution over a period of 4 hours.

Potassium persulfate: 0.17 parts by weight The solid content concentration of the obtained resin latex was 33.5%.

This resin latex was coagulated with an aqueous magnesium sulfate solution, then washed with water and dried to obtain a powdered polymer.

(2) Production of vinyl cyanide compound/aromatic vinyl compound copolymer (B) Acrylonitrile 55 Parts by weight Styrene 5 Terpene oil 0.52 D-t-butyl para-cresol 0.04 Deionized water
90 〃Acrylic acid-octyl acrylate copolymer 0.03 〃Sodium chloride 0.18 〃The mixture consisting of the above components was charged into a stainless steel reactor, heated to 105°C while stirring under nitrogen atmosphere, and a small amount of 0.15 parts by weight of 1-t-butylazo-1-cyano-cyclohexane dissolved in styrene was added under pressure with nitrogen to start the polymerization reaction. Then, immediately add styrene 4 to the reaction system.
0 parts by weight were continuously added over 4 hours. During this time, the reaction temperature was raised from 105°C at the start of polymerization to 141°C. After the continuous addition of styrene to the reaction system is completed, 20
The temperature was raised to 145° C. over several minutes, and stripping was further performed at this temperature for 2.5 hours. Thereafter, the reaction system was cooled, the polymer was separated, washed, and dried according to a conventional method to obtain a bead-like copolymer.

Examples 1 to 6.9 to 11.14 Stearic acid triglyceride as a higher fatty acid triglyceride, a graft copolymer produced by the method described in Reference Examples (1) and (2) above (N't+A>, and a vinyl cyanide compound) / Weigh out the aromatic vinyl compound (component B) at the blending ratio (parts) listed in Table 1,
The mixture was mixed in a tumbler, and the resulting mixture was kneaded using a vented twin-screw extruder while removing volatile components to create pellets of the resin composition.

Test pieces for measuring physical properties were made from the resin pellets by injection molding. Table 1 shows the results of measuring the physical properties.

Example 7.8.12.13 A resin composition was prepared in the same manner as in the above example, except that a mixture of stearic acid triglyceride/palmitic acid triglyceride-515 was used instead of stearic acid triglyceride used in Example 1. The physical properties were measured. The results are shown in Table 1.

Comparative Examples 1 to 4 Graft copolymers (component A) produced by the method described in Reference Examples (1) and (2) above, vinyl cyanide compound/
The aromatic vinyl compound copolymer (B) and the higher fatty acid ester were weighed in the proportions (parts) shown in Table 1. A resin composition was prepared from the weighed mixture in the same manner as in Example 1, and its physical properties were measured. The results are shown in Table 1.

Note that the physical property values were measured by the following methods.

(1) Bending elastic modulus Measure the bending elastic modulus according to JIS K-7203,
This was used as an index of the rigidity required for the inner box of a refrigerator.

(2) Izot impact value The Izot impact value was measured according to JIS K-7110 and was used as an index of impact resistance required for the inner box of a refrigerator.

(3) Melt flow rate The melt flow rate was measured according to JIS K-7210, and was used as an index of moldability required for the inner box of a refrigerator. (Test conditions: Table 1,) (g/10 min).

(4) Low-temperature critical strain A test piece formed into a dumbbell-shaped test piece was fixed in a jig with tensile strain applied at -20°C.
was dropped onto the test piece, and the presence or absence of crazes or cracks was visually determined. This was used as an index of stress crack resistance against HCFC-123. The larger the critical strain value, the better the stress crack resistance.

Claims (1)

[Claims] 1. Composition 1 containing the following component A and component B:
A fluorocarbon-resistant thermoplastic resin composition, characterized in that Component C consisting of 1 to 10 parts by weight of a higher fatty acid triglyceride is blended with 00 parts by weight. Component A: 50-80% by weight of vinyl cyanide monomer in the presence of 20-70% by weight of conjugated diene synthetic rubber;
A graft copolymer obtained by polymerizing 30 to 80% by weight of a monomer mixture consisting essentially of 0 to 50% by weight of an aromatic vinyl monomer. 25-60 parts by weight Component B A copolymer containing 50-80% by weight of vinyl cyanide monomer and 20-50% by weight of aromatic vinyl monomer. 2. The fluorocarbon-resistant thermoplastic resin composition according to claim 1, wherein the higher fatty acid triglyceride is a triester of a higher fatty acid having 8 to 31 carbon atoms and glycerin.