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:
May. 26, 2015
Filed:
Apr. 06, 2006
Clotilde Canivet, Lempdes, FR;
Jean-philippe Rasigade, Clermont-Ferrand, FR;
Fanny Barbotin, Clermont-Ferrand, FR;
Clotilde Canivet, Lempdes, FR;
Jean-Philippe Rasigade, Clermont-Ferrand, FR;
Fanny Barbotin, Clermont-Ferrand, FR;
COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand, FR;
MICHELIN RECHERCHE ET TECHNIQUE, S.A., Granges-Paccot, CH;
Abstract
The present invention relates to a process for preparing a diene elastomer. The invention especially applies to the production of a polybutadiene with a high level of cis-1,4 linkages that has at the same time a Mooney viscosity ML (1+4) greater than or equal to 40, a polydispersity index less than 2.1 and a reduced cold flow and of a polyisoprene. The process according to the invention comprises a reaction of a catalyst system with at least one conjugated diene monomer, this catalyst system being based on at least: This process comprises a separate bringing together of the monomer(s) to be polymerized with at least one alkylaluminium compound of formula AlRor HAlRwhich is identical or not to the alkylating agent of said catalyst system, said amount being chosen as a function of the characteristics of the polymerization medium and/or the polymerization conditions and/or said elastomer to be obtained.