Rubber composition and run-flat tire
AssigneeBridgestone Corporation
InventorsChiyo Yamagata, Shunsuke Saji
Life of this patent
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Abstract
The present invention provides a run-flat tire excellent in high-temperature softening inhibition, and a rubber composition from which the tire can be produced. The rubber composition contains a rubber component, a filler, a vulcanizing agent, and a vulcanization accelerator that contains a sulfenamide-based vulcanization accelerator and 1.0 to 2.0 parts by mass of tetrabenzylthiuramdisulfide based on 100 parts by mass of the rubber component, in which a mass ratio (a/b) of a content (a) of the tetrabenzylthiuramdisulfide to a content (b) of the sulfenamide-based vulcanization accelerator is 0.60 to 1.25.
Claims12
A run-flat tire comprising a rubber composition, the rubber composition comprising:
- a rubber component;
- a filler;
- a vulcanizing agent;
- and
- a vulcanization accelerator containing a sulfenamide-based vulcanization accelerator and 1.0 to 2.0 parts by mass of tetrabenzylthiuramdisulfide based on 100 parts by mass of the rubber component, in which a mass ratio (a/b) of a content (a) of the tetrabenzylthiuramdisulfide to a content (b) of the sulfenamide-based vulcanization accelerator is 0.60 to 1.25,
- wherein the filler contains carbon black having a DBP oil absorption amount of 120 to 180 mL/100 g,
- wherein the rubber composition is used for at least one member selected from the group consisting of a side-reinforcing rubber layer and a bead filler, and
- wherein a mass ratio (d/c) of a total content (d) of the vulcanization accelerator to a total content (c) of the vulcanizing agent is 0.55 to 0.99.
Dependencies are inferred from the claim text.