RUBBER COMPOSITION Russian patent published in 2018 - IPC C08C19/20 C08K3/36 C08L9/00 B60C1/00 

FIELD: chemistry.

SUBSTANCE: invention relates to curable rubber compositions and to vulcanizates obtained therefrom. Composition comprises at least the following components: a) at least one functionalized polymer, b) at least one modified polybutadiene having a content of cis-1,4-elements of >95 % by weight and a content of 1,2-vinyl <1 wt.%, wherein the polybutadiene after the polymerization is modified with sulfur chloride, c) at least one silicic acid, d) at least one further filler, e) at least one vulcanizing agent, f) at least one oil and g) optionally at least one other additive for rubbers, the modified polybutadiene has a stepwise increasing Mooney viscosity (ML 1 + 4 at 100 °C) at least 50 % with respect to the Mooney viscosity (ML 1 + 4 at 100 °C) polybutadiene before the addition of sulfur chloride.

EFFECT: technical result is the preparation of vulcanizable rubber compositions that have good processability in the production of tires, tire treads or tire elements, while tires, tire protectors or tire elements do not deteriorate in their dynamic mechanical properties.

18 cl, 6 dwg, 6 tbl, 10 ex