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:
Jan. 14, 2003
Filed:
Oct. 15, 2001
Jean-Luc Cabioch, Chateaugay, FR;
Jean-Noël Gorce, Tuscalossa, AL (US);
Michelin Recherche et Technique S.A., Granges-Paccot, CH;
Abstract
The present invention provides a process for the preparation of a diene elastomer having a reduced amount of vinyl linkages, by anionic polymerization of one or more monomers comprising at least one conjugated diene monomer. The process for preparing the diene elastomer having a reduced amount of vinyl linkages comprises anionically polymerizing one or more monomers comprising at least one conjugated diene monomer in a polymerization medium comprising a hydrocarbon solvent, a polar agent comprising one or more heteroatoms and a monolitiated or polylithiated organolithiated initiator, wherein an organometallic complex of the formula LiAl(R) (R′), in which Li is a lithium atom, Al is an aluminum atom, and R and R′ are each an alkyl, cycloalkyl or aryl group, is added to the polymerization medium to produce the diene elastomer having a reduced amount of vinyl linkages.