Impact-resistant chemically blended propylene polymer composition and process for preparation thereof

摘要: ABSTRACT OF THE DISCLOSURE An improved process for preparing an impact-resistant chemically blended propylene polymeror copolymer, which comprises the following three steps: 1) a first step of polymerizing containing 0 to 1 mole% another in presence catalyst composed (a) carrier-supported titanium component at least magnesium, halogen and on surface carrier (b) organoaluminum compound form specific crystalline polypropylene; (2) second copolymerizing ethylene or reaction product same while maintaining content gaseous phase polymerization zone 65 90 thereby low-crystalline propylene/ethylene copolymers (3) third ethlene, both ethylene-and 15 mole%thereby polyethylene ethylene/propylene copolymer.