| 摘要 |
<p>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.</p> |
