Method for preparing butadiene/isoprene copolymers

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The invention concerns a method for preparing butadiene and isoprene statistic copolymers essentially consisting in reacting a catalytic system in the presence of butadiene and isoprene, and in : using, as catalytic system, a system based on at least : a conjugated diene monomer, a salt of one or several rare earths of an organic phosphoric acid, an alkylating agent consisting of an alkylaluminium of formula AIR3 or HalR2, and a halogen donor consisting of an alkylaluminium halide, said salt being suspended in at least a saturated inert hydrocarbon solvent of aliphatic or alicyclic type comprised in said catalytic system, and the molar ratio (alkylating agent/rare earth salt) ranges from 1 to 8, and in carrying out a copolymerisation reaction in an inert or mass hydrocarbon polymerizing solvent. Said copolymers are in particular such that the butadiene and isoprene units which they comprise have each a high proportion of cis-1, 4 chains.© KIPO & WIPO 2009