METHOD OF OBTAINING COPOLYMER OF CYCLIC AND ACYCLIC DIENE AND RUBBER MIXTURE Russian patent published in 2015 - IPC C08F4/42 C08F232/06 C08F236/04 C08F236/06 C08F236/08 B60C1/00 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of obtaining copolymers of cyclic and acyclic conjugated diene monomers. The method of obtaining a copolymer of an acyclic conjugated diene and cyclic conjugated diene with the application of a polymerisation catalytic system includes the polymerisation of, at least, one acyclic conjugated diene with, at least, one cyclic conjugated diene with the application of the polymerisation catalytic system, which contains: (a) a transition metal compound or lanthanide metal compound, (b) an alkylating agent and (c) an alcoholate of an inorganic halogenide, where the copolymer contains, at least, 90% of the acyclic conjugated diene monomer, has the number average molecular weight between 40000 and 300000 and has the content of a cis-bond, at least, 92%. The invention also relates to rubber mixtures, containing the copolymer in accordance to the invention, and to a pneumatic tyre.

EFFECT: improved resistance of the copolymer to crack growing.

20 cl, 3 tbl, 10 ex