| 摘要 |
PURPOSE:To obtain the subject composition excellent in paintability, moldability, etc., by compounding a multi-stage polymerized propylene-ethylene block copolymer with specific amounts of an ethylene-propylene copolymer rubber, an ethylene-butene copolymer rubber and talc. CONSTITUTION:The objective composition is produced by compounding (A) 40-60wt.% of a propylene-ethylene block copolymer produced by multi-stage polymerization, (B) 10-20wt.% of an ethylene-propylene copolymer rubber, (C) 10-20wt.% of an ethylene-butene copolymer rubber and (D) 15-30wt.% of talc having an average particle diameter of <=1.5mum. The sum of the components B and C is 20-30wt.% and the component A contains 4-10wt.% (based on 100wt.% of the component A) of propylene-ethylene random copolymer part (having an intrinsic viscosity of >=4.0dl/g and an ethylene content of 30-70wt.%) and a propylene homopolymer part having an intrinsic viscosity of 0.9-1.2dl/g. The ratio of the intrinsic viscosity of the homopolymer part to that of the resin component other than the homopolymer part is 0.1-2.5. |
