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:
Jul. 01, 2008
Filed:
Feb. 17, 2003
Yasushi Tohi, Sodegaura, JP;
Koji Endo, Sodegaura, JP;
Hiromu Kaneyoshi, Sodegaura, JP;
Naomi Urakawa, Sodegaura, JP;
Yuichi Yamamura, Sodegaura, JP;
Koji Kawai, Sodegaura, JP;
Yasushi Tohi, Sodegaura, JP;
Koji Endo, Sodegaura, JP;
Hiromu Kaneyoshi, Sodegaura, JP;
Naomi Urakawa, Sodegaura, JP;
Yuichi Yamamura, Sodegaura, JP;
Koji Kawai, Sodegaura, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Abstract
The bridged metallocene compound or the olefin polymerization catalyst which comprises the compound, enables high polymerization activity in polymerizing one or more monomers selected from ethylene and α-olefins. The bridged metallocene compound contains specific substituted cyclopentadienyl and fluorenyl groups which are linked via carbon or silicon atoms. In the method for the preparation of polyolefins, one or more monomers, preferably ethylene as an essential monomer, selected from ethylene and α-olefins are copolymerized in the presence of the olefin polymerization catalyst comprising the bridged metallocene compound, so that an ethylene based polymer with an ethylene content of more than 50 mol % is obtained.