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. 04, 2001
Filed:
Nov. 30, 1999
Seiki Mitani, Kanagawa-ken, JP;
Masato Nakano, Chiba-ken, JP;
Jun Saito, Chiba-ken, JP;
Hiroshi Yamazaki, Saitama-ken, JP;
Keisuke Kimura, late of Chiba-ken, JP;
Chisso Corporation, Osaka, JP;
Abstract
A metallocene compound is provided wherein to a transition metal compound is bonded a multidentate compound wherein a substituted cycloalkadienyl ring CA,having therein a heteroaromatic group Ra containing an oxygen, sulfur or nitrogen atom on a cycloalkadienyl ring, preferably the five-membered ring thereof, and an unsubstituted or substituted cycloalkadienyl group CA,or —(R,)N—, —O—, —S— or —(R,)P—, preferably CA,, more preferably a substituted cycloalkadienyl group identical with CA,are bonded through a divalent linking group. The metallocene compound is suitable as a principal ingredient of a catalyst for the polymerization of olefins, particularly achieving a very high effect in making the molecular weight of a polypropylene higher.