METHOD OF OBTAINING FUNCTIONALIZED AND BRANCHED ELASTOMERIC COPOLYMERS AND THEIR USE IN VULCANIZABLE ELASTOMERIC COMPOSITIONS Russian patent published in 2017 - IPC C08F2/26 C08F4/08 C08F36/06 C08F236/06 C08F236/10 C08L15/02 C08C19/18 C08C19/44 

FIELD: chemistry.

SUBSTANCE: method for obtaining a functionalized and branched elastomeric copolymer comprises the following stages: (a) anionic copolymerization of at least one conjugated diene monomer and at least one vinylarene in the presence of at least one hydrocarbon solvent, at least a lithium initiator and at least one polar modifier with obtaining a solution containing the elastomeric copolymer; (b) reacting at least 10 wt % of the polymer chains of the elastomeric copolymer obtained at the stage (a), at least one compound containing at least one functional group selected from epoxides, ketones, esters, aldehydes, with obtaining a solution containing the functionalized elastomeric copolymer; (c) adding to the solution obtained at the stage (b) the lithium initiator in a quantity exceeding from 1 to 4 times the molar quantity of the initiator used at the stage (a), as well as bromine compounds of the general formula (I): R-Br (I), where R is a linear or a branched C₁-C₃₀ alkyl group, a C₃-C₃₀ cycloalkyl group, a C₆-C₃₀ aryl group. A vulcanizable elastomeric composition and a vulcanized final product are claimed as well.

EFFECT: copolymer obtained by the method provides a vulcanizable composition with good dynamic and mechanical properties and better processability.

20 cl, 3 tbl, 8 ex