| 摘要 |
An impact-resistant chemically blended propylene polymer composition having an ethylene content of 3 to 40 mole %, and comprising (A) 55 to 95% by weight of crystalline polypropylene containing 0 to 1 mole % of another olefin and having an isotactic index of at least 90, (B) 1 to 10% by weight of low-crystalline propylene/ethylene copolymer containing 60 to 85 mole % of propylene, and (C) 1 to 35 mole % by weight of polyethylene or an ethylene/propylene copolymer containing up to 7 mole % of propylene which has an intrinsic viscosity of at least 0.5 but less than 2.6, the total proportion of (A), (B) and (C) being 100% by weight. The composition is prepared by polymerization of propylene with or without another olefin to form component(A), copolymerizing propylene or ethylene in the presence of (A) to form a chemical rather than physical blend of (A), (B) and polymerizing ethylene with or without propylene in the presence of the (A)-(B) blend to form a chemical blend of (A), (B) and (C). The products are useful for molding. |
