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. 16, 2008
Filed:
May. 25, 2005
James E. Hall, Mogadore, OH (US);
James Oziomek, Cuyahoga Falls, OH (US);
James E. Hall, Mogadore, OH (US);
James Oziomek, Cuyahoga Falls, OH (US);
Bridgestone Corporation, Chuo-ku, Tokyo, JP;
Abstract
A novel method of preparing carboxyl-terminated polymers. A monomer is mixed with an organolithium initiator in a hydrocarbon solvent so as to anionically polymerize linear living polymer lithium chains. A trialkyl aluminum compound is also mixed so as to form polymer lithium: aluminate complexes in equilibrium with the linear living polymer lithium chains. When a cyclic anhydride terminator is mixed, the cyclic anhydride terminator preferentially reacts with the C—Li center on a living polymer lithium chain rather than with the C—Al—Li center on a polymer lithium: aluminate complex.