FIELD: chemistry.
SUBSTANCE: method involves (co)polymerisation of butadiene in the presence of a catalyst based on a rare-earth element and organoaluminium compounds followed by treatment of the (co)polymer with a modifying agent. The modifying agent used is xanthates. The process is carried out in weight ratio of the modifying agent to the (co)polymer equal to 0.01-0.1:1000.
EFFECT: simple method of producing said compound with narrow molecular weight distribution, characterised by low cold flow, kinematic viscosity and low content of high-molecular fractions.
1 cl, 5 ex, 5 tbl
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