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. 25, 2025
Filed:
Dec. 22, 2020
Applicants:
Bridgestone Corporation, Tokyo, JP;
Steven M. Baldwin, Akron, OH (US);
Walter A. Salamant, Akron, OH (US);
Inventors:
Steven M. Baldwin, Akron, OH (US);
Walter A. Salamant, Akron, OH (US);
Assignee:
Bridgestone Corporation, Chuo-ku, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08F 4/54 (2006.01); C08F 136/04 (2006.01); C08F 136/08 (2006.01);
U.S. Cl.
CPC ...
C08F 136/08 (2013.01);
Abstract
A process for preparing a polydiene, the process comprising (i) preparing an active catalyst composition by combining a rare-earth compound including a rare-earth metal, an alkylating agent, an aluminoxane, and optionally a halogen-containing compound, where the catalyst composition includes halogen at molar ratio to the rare-earth metal of from about 0.5:1 to about 2.0:1; and (ii) introducing the active catalyst composition to conjugated diene monomer.