COLD FLOW REDUCED POLYMERS WITH GOOD PROCESSING BEHAVIOUR Russian patent published in 2018 - IPC C08G77/14 C08C19/25 C08F236/06 C08F236/10 C08L13/00 C08L25/10 B60C1/00 

FIELD: chemistry.

SUBSTANCE: invention relates to polymers with functionalised terminal groups with reduced flow in the cold and good processability, preparation and use thereof. Disclosed is a mixture of polymers for the preparation of moulded articles, comprising polymers with functionalised terminal groups, which are diene (co)polymers having, on the ends of polymer chains, silane-containing carboxyl groups of formula (I), and dimers having one or more structural elements derived from silalactones of formula (III), where R¹ and R² may be the same or different and represent an alkyl group, R³ and R⁴ are a hydrogen atom, A is a divalent organic radical which, in addition to C and H atoms, contains an S atom. Also disclosed is a method for preparing mixtures that are part of the mixture, using the claimed mixture of polymers to prepare a vulcanisable rubber composition subsequently used for producing tyres.

EFFECT: technical result is that the disclosed polymer mixtures combine low cold flow values with good processability of the rubber compositions obtained therefrom and allow the production of tyre treads with improved performance.

13 cl, 1 dwg, 6 tbl, 8 ex