Tire tread-use rubber composition
AssigneeThe Yokohama Rubber Co., Ltd.
InventorYoichi Takizawa
Life of this patent
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Abstract
A tire tread-use rubber composition includes from 10 to 50 parts by weight of a tackifying resin having a softening point of from 100° C. to 150° C.; from 70 to 130 parts by weight of a carbon black having a nitrogen specific surface area of from 250 to 400 m2/g; from 1 to 3 parts by weight of sulfur; from 0.5 to 4.0 parts by weight of a sulfenamide vulcanization accelerator; and from 1.5 to 5.0 parts by weight of a thiuram vulcanization accelerator per 100 parts by weight of a rubber component; wherein when A is a compounded amount in parts by weight of the sulfenamide vulcanization accelerator, T is a compounded amount in parts by weight of the thiuram vulcanization accelerator, and S is a compounded amount in parts by weight of the sulfur, a weight ratio (A+T)/S is from 2 to 4.
Claims18
A rubber composition for use as a tire tread comprising:
- a tackifying resin having a softening point of from 100° C. to 150° C. in an amount of from 10 to 50 parts by weight, the tackifying resin including at least one of a terpene phenol resin, a terpene styrene resin, and a polymerized rosin resin;
- a carbon black having a nitrogen specific surface area of from 250 to 400 m2/g in an amount of from 70 to 130 parts by weight;
- sulfur (S) in an amount of from 1 to 3 parts by weight;
- a sulfenamide vulcanization accelerator (A) in an amount of from 0.5 to 4.0 parts by weight of;
- a rubber component comprising from 10 to 30 weight % of a natural rubber and from 75 to 85 weight % of a styrene butadiene rubber having a glass transition temperature of from −35° C. to 0° C.;
- a thiuram vulcanization accelerator (T) in an amount of from 1.5 to 5.0 parts by weight;
- other fillers, a sum of which, when combined with the carbon black, is from 80 to 130 parts by weight;
- per 100 parts by weight of the rubber component;
- wherein, when compounded, (A+T)/S is a weight ratio of from 2≦(A+T)/S< to 4.
Dependencies are inferred from the claim text.