Rubber composition for tire sidewall and tire
AssigneeBridgestone Corporation
InventorsJunko Kurazumi, Kouji Masaki
Life of this patent
Estimating the term…
Abstract
A rubber composition for tire sidewall which comprises a rubber component, which comprises polybutadiene rubber having a content of the cis-1,4-bond of 92% or greater and a content of the vinyl bond of 1.5% or smaller and natural rubber and/or at least one other diene-based synthetic rubber, and 10 to 70 parts by mass of carbon black having a specific surface area by nitrogen adsorption of 20 to 100 m2/g per 100 parts by mass of the rubber component and does not comprise a softener having an aniline point of 50° C. or lower and a tire using the rubber composition for sidewall. Excellent resistance to cut growth is obtained while sufficient workability is surely exhibited.
Claims8
A rubber composition for tire sidewall which comprises a rubber component and 10 to 70 parts by mass of carbon black having a specific surface area by nitrogen adsorption of 20 to 100 m2/g per 100 parts by mass of the rubber component and does not comprise a softener having an aniline point of 50° C. or lower, the rubber component comprising polybutadiene rubber having a content of a cis-1,4-bond of 92% or greater and a content of a vinyl bond of 0.71% or smaller, and natural rubber and/or at least one other synthetic diene rubber,
- wherein the rubber composition comprises at least one softener selected from the group consisting of process oils which have a kinematic viscosity (40° C.) of 15 to 35 mm2/s and an aniline point of 83 to 120° C., C5 aliphatic petroleum resins and C9 aromatic petroleum resins.
Dependencies are inferred from the claim text.