FIELD: chemistry.
SUBSTANCE: invention relates to a process for the preparation of a 1,3-butadiene and styrene and use thereof in the vulcanizable elastometric compositions. Process comprises a) anionically polymerizing a blend comprising from 5 % by weight to 40 % by weight of styrene and from 60 % by weight to 95 % by weight of 1,3-butadiene, with respect to the overall weight of the mixture, in the presence of at least one hydrocarbon solvent, of at least one lithium-based catalyst having the general formula LiR1 b) optionally, reacting the copolymer obtained in step (a) with at least one chain-end monomer selected from 1,3-butadiene, styrene and α-methylstyrene; c) reacting from 10 % by weight to 70 % by weight, of the lithium-terminated polymeric chains present in the copolymer obtained in step (a) or in step (b) with at least one coupling agent, selected from liquid polyepoxides having at least three reactive sites capable of reacting with the carbon-lithium chain-ends; d) optionally, reacting the copolymer obtained in step (c) with at least one chain-end monomer, selected from 1,3-butadiene, styrene and α-methylstyrene; e) reacting the linear polymeric chains remaining in the copolymer obtained in step (c) or in step (d), with at least one tin compound having the general formula XSn(R2)3, wherein X represents chlorine, and R2 represents a linear or branched C1-C10 alkyl group. Described also is a curable elastomer composition and product.
EFFECT: technical result is obtaining copolymers 1,3-butadiene and styrene, having good miscibility with fillers, particularly with carbon soot and/or silicon.
14 cl, 4 tbl, 4 ex
