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:
Sep. 17, 2024
Filed:
Jan. 28, 2020
Applicant:
Bridgestone Americas Tire Operations, Llc, Nashville, TN (US);
Inventors:
James J. Kuhel, III, Stow, OH (US);
David M. Roggeman, North Royalton, OH (US);
Assignee:
Bridgestone Americas Tire Operations, LLC, Nashville, TN (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08F 136/06 (2006.01); C08F 2/00 (2006.01); C08F 2/06 (2006.01); C08F 2/44 (2006.01); C08F 4/54 (2006.01); C08F 136/00 (2006.01); C08K 5/12 (2006.01); B60C 1/00 (2006.01);
U.S. Cl.
CPC ...
C08F 136/06 (2013.01); C08F 2/001 (2013.01); C08F 2/06 (2013.01); C08F 2/44 (2013.01); C08F 4/545 (2013.01); C08F 136/00 (2013.01); C08K 5/12 (2013.01); B60C 1/0016 (2013.01); B60C 1/0025 (2013.01);
Abstract
A process for preparing a polydiene having increased viscosity and reduced cold flow that includes polymerizing a conjugated diene monomer in the presence of a lanthanide-containing compound to form an intermediate polymer, and then adding a non-organometallic trimellitate ester compound as a coupling agent to raise the viscosity of the intermediate polymer. The coupling agent is added to the intermediate polymer mixture in an amount of about 0.01 to about 0.15 parts per hundred monomer (phm) of the starting monomer amount.