ACTIVATION OF CATALYTIC SYSTEMS FOR THE STEREOSPECIFIC POLYMERIZATION OF DIENES

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An activated preformed catalytic system for the 1, 4-cis stereospecific polymerization of conjugated dienes based on at least : one or more preformation conjugated diene monomers, one or more salts of one or more rare-earth metals of one or more acids chosen from an organic phosphoric acid and an organic carboxylic acid, and a mixture thereof, one or more alkylating agents consisting of one or more alkylaluminiums of formula AlR3 or HAlR2, in which R represents an alkyl radical and H represents a hydrogen atom, one or more halogen donors consisting of an alkylaluminium halide, andone or more compounds corresponding to formula (I) below :