Patent ID: 6210797
Filing Date: 2001-04-03
Classification: B60R,C08L,Y10T

Abstract:
An airbag storing case for an airbag restraint system, comprising:a main body formed of a material comprising a thermoplastic elastomer composition in a single-layer structure and having a groove which makes the main body tear easily with expansion of the airbag, the thermoplastic elastomer composition being prepared by:mixing 100 parts by weight of a copolymer composition with 0.05 to 0.5 parts by weight of a lubricant comprising higher fatty acid amide to obtain a mixture; anddynamically heat-treating the mixture in the presence of an organic peroxide and an auxiliary crosslinking agent,wherein the copolymer composition comprises:(A) 20 to 50 parts by weight of an olefin copolymer resin of propylene and one or two kinds of 1-olefin other than propylene;(B) 10 to 50 parts by weight of ethylene-propylene copolymer rubber having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) ranging from 30 to 60;(C) 10 to 70 parts by weight of ethylene-propylene-nonconjugated diene copolymer rubber having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) ranging from 50 to 100; and(D) 10 to 50 parts by weight of an oil-extended ethylene-propylene-nonconjugated diene copolymer rubber containing ethylene-propylene-nonconjugated diene copolymer having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) ranging from 150 to 350 and a mineral oil softener contained at an amount of 50 to 150 parts by weight relative to 100 parts by weight of the ethylene-propylene-nonconjugated diene copolymer.