The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 01, 1998
Filed:
Mar. 05, 1997
Masaaki Ohgizawa, Yamaguchi, JP;
Mamoru Kioka, Yamaguchi, JP;
Mitsui Petrochemical Industries, Ltd., Tokyo, JP;
Abstract
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.