Cover for a vehicle air bag

摘要

A cover for a vehicle air bag comprises an external surface layer injection-molded from a thermoplastic material having a JIS-A hardness of 20 to 90 and a core layer injection-molded from a thermoplastic material having a bending elastic modulus (JIS K 7203) of not less than about 1000 kg/cm2 and a hardness greater than that of the surface layer. The core has weakened zones along which the cover breaks when the air bag is inflated.