Rubber composition for run-flat tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorYoshihiro Kameda
Life of this patent
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Abstract
A rubber composition for a run-flat tire comprises from 20 to 100 parts by weight of a reinforcing filler per 100 parts by weight of a diene rubber containing from 10 to 80 wt. % of butadiene rubber and from 10 to 40 wt. % of natural rubber; wherein the reinforcing filler contains at least 50 wt. % of carbon black; a mode diameter Dst in a mass distribution curve of a Stokes diameter of aggregates of the carbon black is at least 145 nm; a nitrogen adsorption specific surface area N2SA is from 45 to 70 m2/g; and a ratio N2SA/IA of the nitrogen adsorption specific surface area N2SA to an iodine adsorption IA (units: mg/g) is from 1.00 to 1.40.
Claims7
A rubber composition for a run-flat tire, the rubber composition comprising:
- from 20 to 100 parts by weight of a reinforcing filler per 100 parts by weight of a diene rubber containing from 10 to 80 wt. % of butadiene rubber and from 10 to 40 wt. % of natural rubber;
- wherein
- the reinforcing filler contains at least 50 wt. % of carbon black;
- a mode diameter Dst in a mass distribution curve of a Stokes diameter of aggregates of the carbon black is at least 145 nm;
- a nitrogen adsorption specific surface area N2SA is from 55 to 70 m2/g;
- a ratio N2SA/IA of the nitrogen adsorption specific surface area N2SA to an iodine adsorption IA (units:
- mg/g) is from 1.00 to 1.40;
- and
- the mode diameter Dst of the Stokes diameter satisfies a relationship of the following formula (1):
- Dst<1979×(N2SA)−0.61 (1)
- wherein, Dst is the mode diameter (nm) in the mass distribution curve of the Stokes diameter of aggregates, and N2SA is the nitrogen adsorption specific surface area (m2/g).
Dependencies are inferred from the claim text.