| 摘要 |
PURPOSE:To provide soft feeding and hard property of shape retention by furnishing a skin layer consisting of thermoplastic polymer having specific composition and hardness, and providing a core layer consisting of polyolefin resin having specific flextural modulus of elasticity. CONSTITUTION:A cover 1 for accommodating an air bag 2 is composed of a skin layer 1A and a core layer 1B. The skin layer 1A is made of a rubber softening material of hydrocarbon type having such properties that hydrogen added derivative of block copolymer consisting of stylene or conjugate diene shares 40-80% by weight, olefin resin shares 5-30% by weight, polyisobuthylene having a viscosity-mean molecular weight of 70000 or less shares 2-30% by weight, and the dynamic viscosity at 40 deg.C is below 50cSt, or of a thermoplastic polymer having such properties that polybuthene having a numerical-mean molecular weight under 2500 shares 0-20% by weight and the specific hardness lies between 20-90. The core layer 1B is, on the other hand, made of olefin resin having the specific flexural modulus of elasticity ranging 1000-7000kg/cm<2>. |
