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:
Nov. 03, 2020
Filed:
Jun. 17, 2016
Compagnie Generale Des Etablissements Michelin, Clermont-Ferrand, FR;
Margarita Dorato, Clermont-Ferrand, FR;
Lionel Flesinski, Clermont-Ferrand, FR;
Pierre Kiener, Clermont-Ferrand, FR;
COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand, FR;
Abstract
A process for the continuous synthesis of a diene elastomer by n reactors r1 to rn, n ranging from 2 to 15, is provided. The reactor r1 is fed by an input solution comprising a solvent, one or more monomers, an anionic polymerization initiator and a polar agent, one or more of the reactor(s) r2 to rn also being fed by reinjection of a purified solution comprising solvent and/or monomer(s), the purity of the or of each reinjected solution being such that the proportion of the number of dead chains in the output stream from the reactor rn is less than 30%, of the number of living chains initiated in the reactor r1, the temperature of each reactor ranging from 20 to 150° C. and being greater than or equal to the temperature of the reactor which immediately precedes it, the diene elastomer having a polydispersity index of 1.1 to 2.