Catalyst system for producing ethylene (co) polymer with improved branch distribution

摘要

A process for synthesizing a catalyst component for manufacturing ethylene polymer and co-polymer. The present invention provides a process for synthesizing catalyst component (A), comprising forming a complex by contacting the solid intermediate (B) with an aluminum compound represented by formula X_3-nAl(OY)_n, and alkyl metal (C), wherein X is halide, Y is a hydrocarbon group or chelating carbonyl group, and wherein 1 is less than or equal to n which is less than or equal to 3, and then contacting the complex with titanium halide having formula TiX₄ wherein X is halide. Solid intermediate (B) is formed by reacting magnesium metal with alkyl halide in the presence of alkoxy aluminum represented by formula Al(OR^a)₃, silicon halide represented by formula SiX₄ and alkoxy silane represented by formula Si(OR^b)₄, wherein R^a and R^b are an aromatic or aliphatic alkyl group and wherein X is halide. Alkyl metal (C) is synthesized by reacting alkyl aluminum compounds represented by formula AlR^c₃ with a secondary amine having formula HNR^d₂ and then by reacting with alkyl magnesium compounds represented by formula R^eMgR^f, wherein R^c, R^d, Re and R^f are an aromatic or aliphatic alkyl group. The catalyst component is suitable for producing ethylene polymer and co-polymer with narrow molecular weight distribution as well as improved branching compositional distribution.