# US 4,396,654 A · Impact resistant resin composition

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- Number: US 4,396,654 A
- Document ID: US4396654A
- Status: Granted
- Kind: A
- Application number: 06/276,875
- Filed: 1981-06-24
- Granted: 1983-08-02
- Earliest claimed: 1980-06-27
- Assignees: Japan Synthetic Rubber Co., Ltd.
- Inventors: Mitsuo Abe; Yozo Kitagawa; Tadahiko Tsutsumi; Tadashi Kato; Seiichi Atomori
- Web page: https://patentgrep.com/patent/US4396654A

## CPC

- C08F 279/04: Vinyl aromatic monomers and nitriles as the only monomers
- C08F 255/06: on to ethylene-propylene-diene terpolymers {(C08F255/023 takes precedence)}
- C08L 55/02: ABS [Acrylonitrile-Butadiene-Styrene] polymers
- Y10T 428/1376: Foam or porous material containing
- Y10T 428/249976: Voids specified as closed
- Y10T 428/249991: Synthetic resin or natural rubbers
- Y10T 428/249992: Linear or thermoplastic
- Y10T 428/31583: Nitrile monomer type [polyacrylonitrile, etc.]
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

When the impact resistant resin composition comprising a graft polymer in which an aromatic alkenyl compound and an alkenyl cyanide compound are grafted on a rubbery polymer, and a matrix consisting essentially of an aromatic alkenyl compound-alkenyl cyanide compound copolymer satisfies the following conditions, the composition has an improved vacuum formability and the molded articles obtained by vacuum-forming the same have smaller variations in thickness at any given area and there is a smaller reduction of strength due to contact with foamed polyurethane: (1) the proportion of the rubbery polymer in said impact resistant resin composition is 10-30% by weight, (2) the graft polymer has a degree of grafting of 70-120% by weight, (3) the matrix has an intrinsic viscosity of 0.55-0.80 dl/g as measured at 30.degree. C. in methyl ethyl ketone, and (4) the weight ratio of the aromatic alkenyl compound to the alkenyl cyanide compound in the impact resistant resin composition is in the range of 2.0-2.8. When said resin composition contains further 0.01-2.0% by weight of a diorganopolysiloxane having a viscosity of 5-100,000 centistokes at 25.degree. C. and/or 0.1-3% by weight of a metal salt of a fatty acid, its ability to maintain the strength upon contact with foamed polyurethane is enhanced.

## Claims

### Claim 1

A refrigerator box body comprising an inner box made from an impact resistant resin composition comprising a graft polymer in which styrene and acrylonitrile are grafted on a rubbery polymer, and a matrix consisting essentially of a styrene-acrylonitrile copolymer, characterized in that:
(1) the proportion of the rubbery polymer in said impact resistant resin composition is 10-30% by weight,
(2) the graft polymer has a degree of grafting of 70-120% by weight,
(3) the matrix has an intrinsic viscosity of 0.55-0.80 dl/g as measured at 30.degree. C. in methyl ethyl ketone,
and
(4) the weight ratio of the styrene to the acrylonitrile in the impact resistant resin composition is in the range of 2.0-2.8,
and an insulating layer of foamed polyurethane surrounding the outside of said inner box and in contact therewith.

### Claim 2 (depends on 1)

A refrigerator box body according to claim 1, wherein said rubbery polymer is at least one member selected from the group consisting of polybutadiene, acrylonitrile-butadiene copolymer, butadiene-styrene copolymer, polyisoprene, polychloroprene and ethylene-propylene-diene type rubbers.

### Claim 3 (depends on 1)

A refrigerator box body according to claim 1, wherein the proportion of the rubbery polymr in the impact resistant resin composition is 12-25% by weight.

### Claim 4 (depends on 1)

A refrigerator box body according to claim 1, wherein the degree of grafting is 90-110% by weight.

### Claim 5 (depends on 1)

A refrigerator box body according to claim 1, wherein the matrix has an intrinsic viscosity of 0.60-0.75 dl/g as measured at 30.degree. C. in methyl ethyl ketone.

### Claim 6 (depends on 1)

A refrigerator box body according to claim 1, wherein the weight ratio of the styrene to the acrylonitrile in the resin composition is in the range of 2.1-2.6.

### Claim 7 (depends on 1)

A refrigerator box body according to claim 1, which additionally contains a diorganopolysiloxane having a viscosity of 5-100,000 centistokes at 25.degree. C. in a proportion of 0.01-2.0% by weight based on the weight of the impact resistant resin composition.

### Claim 8 (depends on 7)

A refrigerator box body according to claim 7, wherein the organic substituent of said diorganopolysiloxane is at least one member selected from the group consisting of alkyl, aryl and vinyl.

### Claim 9 (depends on 1)

A refrigerator box body according to claim 1, which additionally contains a metal salt of a fatty acid having 12 or more carbon atoms in a proportion of 0.1-3% by weight based on the weight of the impact resistant resin composition.