Rubber composition for tread and tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorShingo Himeda
Life of this patent
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Abstract
An object of the present invention is to provide a rubber composition for a tire having improved overall performances such as block crack resistance, abrasion resistance and heat build-up characteristic, and a tire having a tire member composed of this rubber composition. The rubber composition for a tire comprises a rubber component comprising 50% by mass or more of an isoprene rubber, 30% by mass or more of a butadiene rubber and 1 to 20% by mass of a styrene-butadiene rubber having a number-average molecular weight of 150,000 or more and a styrene content of 18 to 38% by mass, wherein a value obtained by multiplying a content (% by mass) of the styrene-butadiene rubber by a styrene content (% by mass) of the styrene-butadiene rubber is from 100 to 400.
Claims5
A rubber composition for a tire comprising a rubber component comprising 50 to 69% by mass of an isoprene rubber, 30 to 49% by mass of a butadiene rubber, and 1 to 20% by mass of a styrene-butadiene rubber having a number-average molecular weight of 300,000 or more and a styrene content of 18 to 38% by mass, wherein a value obtained by multiplying a content (% by mass) of the styrene-butadiene rubber by a styrene content (% by mass) of the styrene-butadiene rubber is from 100 to 400.
Dependencies are inferred from the claim text.