COPOLYMERS OF COUPPED DIENES AND VINYLAROMATIC MONOMERS AND METHOD FOR THEIR PRODUCTION; RUBBER MIXTURES BASED ON THE SPECIFIED COPOLYMERS Russian patent published in 2018 - IPC C08C19/30 

FIELD: technological processes.

SUBSTANCE: present invention relates to the industry of synthetic rubbers used in the manufacture of tires, rubber products, electrical and other fields, namely, to functionalized branched copolymers of conjugated dienes and vinyl aromatic monomers, to rubber mixtures based on these copolymers, and to a method for producing said copolymers. Method is described for preparing functionalized branched copolymers by copolymerizing conjugated dienes and vinyl aromatic monomers in a hydrocarbon solvent to form a linear functionalized copolymer (1) and branched copolymer (2), followed by mixing them, where the copolymer (1) is obtained optionally in the presence of a special monomer selected from substituted vinylsilanes, namely bis (dialkylamino) vinylalkylsilanes, an electron donor additive, an initiator, which is an organolium compound, or an initiator, which is a functionalized initiator obtained from an organolithium compound and a secondary amine, and the addition of at least one terminal modifier selected from siloxanes or low-molecular maleinated polybutadienes, and where copolymer (2) is obtained optionally in the presence of a special monomer selected from the group of vinylpyridines, an electron donor additive, an initiator, which is an organolithium compound, or an initiator, which is a functionalized initiator obtained from an organolithium compound and a secondary amine, and the addition of at least one branching agent. Copolymers and rubber compounds are also described.

EFFECT: copolymers with excellent affinity with silica fillers are proposed, which, when processed in rubber, provides them with high elastic hysteresis properties, such as rolling resistance and wet grip.

22 cl, 3 tbl, 21 ex