Rubber composition, vulcanized rubber, and tire

Abstract

Tire combining low elastic modulus at low temperatures with high hysteresis loss at low temperatures having excellent on-ice brake performance, and vulcanized rubber and a rubber composition from which the tire is obtained. A rubber composition comprising rubber component comprising a natural rubber, a polybutadiene rubber, and a styrene-butadiene copolymer rubber, and 50 to 90 parts by mass of a filler comprising silica relative to 100 parts by mass of the rubber component, wherein the mass n of the natural rubber in the rubber component is 40% by mass or more, the mass n, the mass b of the polybutadiene rubber, and the mass s of the styrene-butadiene copolymer rubber satisfy the relation: s≤b≤n, provided that when n=b, s<b, and 50% by mass or more of the silica is comprised in a phase comprising the polybutadiene rubber and the styrene-butadiene copolymer rubber.

Dependencies are inferred from the claim text.