Tread rubber composition and pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorKentaro Nakamura
Life of this patent
Estimating the term…
Abstract
Provided are tread rubber compositions and pneumatic tires which are excellent in abrasion resistance. Included is a tread rubber composition containing, based on 100% by mass of a rubber component therein, 10% by mass or more of styrene-butadiene rubber and 10% by mass or more of polybutadiene rubber, and having an absolute value of change in hardness before and after heat aging, |ΔHs|, satisfying the following relationship (1) and an absolute value of change in Swell before and after heat aging, |ΔSwell|, satisfying the following relationship (2) |ΔHs|≤3.0 (1); |ΔSwell|≤20% (2).
Claims4
A pneumatic tire, comprising a tread rubber composition,
- comprising, based on 100% by mass of a rubber component therein, 10% by mass or more of styrene-butadiene rubber and 10% by mass or more of polybutadiene rubber, and
- having an absolute value of change in hardness before and after heat aging, |ΔHs|, satisfying the following relationship (1) and an absolute value of change in Swell before and after heat aging, |ΔSwell|, satisfying the following relationship (2):
- |ΔHs|≤3.0 (1);
- |ΔSwell|≤20% (2),
- wherein the heat aging is performed in accordance with JIS K6257:2010 under heat aging conditions at 100*C for 96 hours, wherein the hardness is measured using a type A durometer in accordance with JIS K6253 and wherein the tread rubber composition does not include a zinc dithiophosphate.
Dependencies are inferred from the claim text.