POLYMER COMPOSITION AND METHOD FOR ITS PREPARATION Russian patent published in 2022 - IPC C08C19/00 C08F136/06 C08F236/06 C08L9/00 C08L9/06 B60C1/00 

FIELD: tire industry.

SUBSTANCE: invention can be used in the production of tires. Variants of a polymer composition characterized by a low, less than 40%, content of vinyl groups used in the composition of rubber compounds to produce tires are proposed. The polymer composition is a mixture of styrene-butadiene and polybutadiene polymerizates in a mass ratio of 1:1. Styrene-butadiene polymerizate was obtained using an electron-donating additive containing at least two heteroatoms, an aliphatic potassium alcoholate and an organolithium initiator using a terminal modifier. Polybutadiene polymerizate was obtained in the presence of a catalytic complex of an organoaluminium compound with neodymium compounds using at least one branching agent containing tin. The terminal modifier is selected from a group of compounds containing at least one oxygen and silicon atom or at least one nitrogen atom in their structure. A method for obtaining a polymer composition, its application, rubber mixtures for obtaining tires and a tire are also proposed.

EFFECT: improving the wearability of the material obtained from synthetic rubber, while maintaining its elastic hysteresis properties at a level close to natural rubber.

34 cl, 3 tbl, 21 ex