DIENE RUBBER AND RUBBER COMPOSITION Russian patent published in 2023 - IPC C08L9/00 C08L7/00 C08K3/06 B60C1/00 

FIELD: tire rubber composition.

SUBSTANCE: composition includes a diene rubber (A) containing butadiene units and having an average molecular weight of 5000 to 50000, a solid rubber (B) representing at least one material selected from the group consisting of natural rubbers, butadiene-styrene rubbers, butadiene rubbers and isoprene rubbers, and a vulcanizing agent (D) which is sulphur. The content of the diene rubber (A) is 2 to 30 parts by mass per 100 parts by mass of the hard rubber (B), and the amount of the vulcanizing agent (D) is 0.1 to 10 parts by mass per 100 parts by mass of the hard rubber (B). Diene rubber (A) meets the requirements (i) β_avg>0, (ii) β₁₂>40, (iii )β_avg/(β₁₂-40)≤2, where β₁₂ means mol.%. 1,2-linked butadiene units and β_avg means mol.% structural units represented by the formula:

A crosslinked product obtained by crosslinking the rubber composition, a tire tread, a bead filler cord, a tire breaker and a pneumatic tire containing, at least in part, a rubber composition or a crosslinked product, are also described.

EFFECT: achievement of high levels of adhesion coefficient with wet road surface and coefficient of adhesion with ice, as well as high mechanical properties.

10 cl, 2 tbl, 27 ex