Rubber composition and pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorTetsuya Kunisawa
Life of this patent
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Abstract
There are provided a rubber composition for coating a steel cord, containing 100 parts by mass of diene-based rubber; 0.5 to 5 parts by mass of a metal salt of an organic acid; and 30 to 100 parts by mass of a filler, wherein the filler contains 3 to 30 parts by mass of glass beads having a particle diameter of 10 to 100 μm, relative to 100 parts by mass of the diene-based rubber, and a tire reinforcement belt and a pneumatic tire using the rubber composition. The rubber composition reduces heat generation and improves adhesiveness with a steel cord. A pneumatic tire having a tire reinforcement belt using the rubber composition has excellent steering stability and rolling resistance.
Claims2
A pneumatic tire comprising a belt layer including at least two tire reinforcement belts formed by coating a plurality of steel cords, which are drawn and aligned substantially in parallel, with a rubber composition for coating a steel cord, the rubber composition comprising:
- 100 parts by mass of natural rubber;
- 0.5 to 5 parts by mass of a metal salt of an organic acid;
- and
- 30 to 100 parts by mass of a filler,
- wherein said filler contains 3 to 30 parts by mass of glass beads having a particle diameter of 37 to 63 μm, relative to 100 parts by mass of said natural rubber;
- wherein said filler further contains 5 to 90 parts by mass of carbon black, relative to 100 parts by mass of said natural rubber;
- and
- wherein said plurality of steel cords are disposed so as to cross each other in a tire circumferential direction.
Dependencies are inferred from the claim text.