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:
Nov. 13, 2001
Filed:
Oct. 26, 1999
Mitsugu Kanzawa, Sodegaura, JP;
Idemitsu Petrochemical Co., Ltd., Tokyo, JP;
Abstract
In olefin polymer production, for which is used a metallocene-type catalyst having a double-crosslinked indenyl or substituted indenyl group, a small amount of hydrogen is added to the polymerization system. Concretely, hydrogen is added thereto so that the hydrogen concentration in the olefin being polymerized could be from 0.01 to 10 mol % or hydrogen could be in the polymerization system in an amount of from 10 to 20000 mols relative to one mol of the transition metal in the metallocene-type catalyst. Hydrogen added to the olefin polymer production system enhances the polymerization activity of the catalyst used, and the catalyst could exhibit high activity in the presence of hydrogen.