Patent ID: 9040644
Filing Date: 2015-05-26
Classification: C08F

Abstract:
1. Process for preparing a diene elastomer, comprising a continuous or batch polymerization reaction, in solution or in bulk, of at least one conjugated diene monomer with a catalyst system, said catalyst system being based on at least: one preforming conjugated diene monomer; one organic phosphoric acid salt of one or more rare-earth metals, said salt being in suspension and in at least one saturated, aliphatic or alicyclic, inert hydrocarbon-based solvent; one alkylating agent composed of an alkyl aluminium of formula AlR a halogen donor belonging to the family of alkylaluminium halides, with the exclusion of alkylaluminium sesquihalides, wherein at least one alkylaluminium compound of formula AlR wherein the separately introduced alkylaluminium compound and the alkylating agent are present in a molar ratio that varies from 0.05 to 3.