Rubber composition for tire, and pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorTatsuya Miyazaki
Life of this patent
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Abstract
The invention provides a rubber composition for a tire, and a pneumatic tire that are capable of achieving both good fuel economy and a good elongation at break. The rubber composition for a tire according to the invention includes a rubber component containing an isoprene-based rubber; sulfur; and a coumarone-indene resin having a softening point of −20° C. to 45° C., wherein the coumarone-indene resin is contained in an amount of 0.5 to 20 parts by mass per 100 parts by mass of the rubber component.
Claims4
A pneumatic tire comprising a breaker topping, a base tread, a sidewall, a clinch, a tie gum, a bead apex, or a sidewall-reinforcing layer formed from a rubber composition for a tire, said rubber composition comprising:
- a rubber component containing an isoprene-based rubber;
- sulfur;
- carbon black having a nitrogen adsorption specific surface area (N2SA) of not more than 84 m2/g;
- and
- a coumarone-indene resin having a softening point of −20° C. to 45° C.,
- wherein the coumarone-indene resin is contained in an amount of 0.5 to 6 parts by mass per 100 parts by mass of the rubber component.
Dependencies are inferred from the claim text.