OPPOSITELY CONVERGING THERMOPLASTIC ELASTOMERS Russian patent published in 2019 - IPC C08L9/06 C08F297/04 

FIELD: chemistry.

SUBSTANCE: composition of anti-convergent thermoplastic elastomers, comprising: (a) a back-converging diblock copolymer A-[A/B] with peak molecular weight of 20,000 to 250,000, which includes a monovinylaromatic homopolymer block A with peak molecular weight of at least 8,000 and a counter-converting copolymer unit [A/B] with vinyl content of at least 15 wt% with respect to the number of conjugated diene links in the diblock copolymer; and (b) a block copolymer selected from a group consisting of linear triblock copolymers having a peak molecular weight which is at least about 1.5 times greater than the peak molecular weight of the backwardly converging diblock copolymer A-[A/B], described in (a), multi-beam coupled block copolymers having peak molecular weight, which is at least approximately 2.5 times greater than the peak molecular weight of the backwardly converging diblock copolymer A-[A/B] described in (a), and mixtures thereof; and (c) wherein ratio of (a) to (b) in composition of anti-contracting thermoplastic elastomers ranges from about 1:5 to about 5:1.

EFFECT: invention enables to obtain a thermoplastic elastomer with improved reinforcement characteristics.

68 cl, 8 dwg, 18 tbl