VULCANIZED RUBBER COMPOSITION AND TIRE USING SAME

摘要

A vulcanized rubber composition assuring a well-balanced improvement of abrasion resistance, fuel efficiency and breaking resistance and a tire using a tread made of the vulcanized rubber composition are provided. The vulcanized rubber composition comprises a phase (SBR phase) comprising a styrene butadiene rubber being incompatible with a butadiene rubber and silica, and a phase (BR phase) comprising a butadiene rubber and silica, wherein the SBR phase and the BR phase are incompatible with each other, an abundance ratio α of silica in the SBR phase after vulcanization satisfies 0.3≦α≦0.7 (Relation 1), and a proportion β of the styrene butadiene rubber being incompatible with the butadiene rubber satisfies 0.4≦β≦0.8 (Relation 2), and the tire has a tread composed of the vulcanized rubber composition.

主权项

1. A vulcanized rubber composition having:
a phase (SBR phase) comprising a styrene butadiene rubber being incompatible with a butadiene rubber and silica, and a phase (BR phase) comprising a butadiene rubber and silica, wherein the SBR phase and the BR phase are incompatible with each other, an abundance ratio α of silica in the SBR phase after vulcanization satisfies the following Relation 1, and a proportion β of the styrene butadiene rubber being incompatible with the butadiene rubber satisfies the following Relation 2:
0.3≦α≦0.7   (Relation 1)0.4≦β≦0.8   (Relation 2)wherein α=Amount of silica in SBR phase/(Amount of silica in SBR phase+Amount of silica in BR phase) and β=(Mass of styrene butadiene rubber being incompatible with butadiene rubber in vulcanized rubber composition/Mass of total rubber components in vulcanized rubber composition).