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:
Mar. 09, 2004
Filed:
Dec. 21, 2001
Robert Pierre, Perignat-les-Sarlieve, FR;
Jean-Michel Favrot, Cournon-D'auvergne, FR;
Jean-Luc Cabioch, Chateaugay, FR;
Bernard Voullemier, Aubiere, FR;
Michelin Recherche et Technique S.A., Granges-Paccot, CH;
Abstract
The present invention relates to block copolymers intended to constitute an elastomeric matrix of a cross-linkable rubber composition with reduced hysteresis, to such a rubber composition which is usable in the cross-linked state in a tire tread, to such a tire tread and to a tire comprising said tire tread which exhibits reduced rolling resistance. A copolymer with n blocks (n=2 or 3) according to the invention, each of said blocks comprising a diene elastomer having a molar content of units originating from conjugated dienes of greater than 15%, and one or each of said blocks which forms the chain end of said copolymer consisting of a polyisoprene, when n=2 or n=3 respectively, is such that the number-average molecular weight M of said or each polyisoprene end block is between about 2,500 and 20,000 g/mol, and such that the number-average molecular weight M of the block of said copolymer which is other than said or each polyisoprene end block is between about 80,000 g/mol and 350,000 g/mol.