HIGH EFFICIENCY CATALYST FOR POLYMERIZING OLEFINS, AND THE USE THEREOF

摘要

Catalyst compositions exhibiting high activity for the polymerization of alpha -olefins are prepared by reacting (A) tetravalent or trivalent titanium compounds such as a titanium tetraalkoxide, (B) an anhydrous nickel compound such as nickel chloride, (C) an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an alkyl aluminum, (D) a halide source such as a hydrogen halide or an alkyl aluminum halide, and (E) an alkyl aluminum halide if not otherwise provided. Polymerization processes employing this catalyst composition do not require subsequent catalyst removal steps and the resulting polymers have broader molecular weight distributions than do corresponding polymers prepared without the added anhydrous nickel compound.