Process for the preparation of olefin polymer

摘要

A process for preparing an olefin polymer comprising the steps of: preparing an olefin polymer [I] by polymerizing or copolymerizing an olefin in the presence of an olefin poymerization catalyst comprising a specific solid titanium catalyst component [A], a specific organoaluminum compound catalyst component [B] and a specific electron donor catalyst component [C]; preparing an olefin polymer [II] by polymerizing or copolymerizing an olefin in an polymerizer different from that for the polymerization of the above step in the presence of an olefin poymerization catalyst comprising a specific solid titanium catalyst component [A], a specific organoaluminum compound catalyst component [B] and a specific electron donor catalyst component [D]; and then allowing the resulting olefin polymer [I] and the resulting olefin polymer [II] to coexist in one polymerizer to further polymerize or copolymerize an olefin.