Tread rubber composition and pneumatic tire employing the same
AssigneeSumitomo Rubber Industries, Ltd.
InventorNaohiko Kikuchi
Life of this patent
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Abstract
A tread rubber composition improved both in grip performance on ice-covered and snow-covered road surfaces and in abrasion resistance is provided. The tread rubber composition contains aluminum hydroxide having an untamped density of not more than 0.60 g/cm3, a DOP oil absorption of at least 70 cm3/100 g and less than 250 cm3/100 g, and a BET specific surface area of at least 30 m2/g and not more than 350 m2/g in an amount of 5-60 parts by weight with respect to 100 parts by weight of a rubber component containing at least 50% by weight of at least one of polyisoprene rubber and polybutadiene rubber. The tread rubber composition has a tanδ peak temperature of not more than −45° C. and a type A durometer hardness at 0° C. of not more than 64.
Claims7
A tread rubber composition containing aluminum hydroxide having an untamped density of not more than 0.60 g/cm3, a DOP oil absorption of at least 70 cm3/100 g and less than 250 cm3/100 g, and a BET specific surface area of at least 30 m2/g and not more than 350 m2/g in an amount of 5-60 parts by weight with respect to 100 parts by weight of a rubber component containing at least 50% by weight of at least one of polyisoprene rubber and polybutadiene rubber, characterized in that a tanδ peak temperature is not more than −45° C. and a type A durometer hardness at 0° C. is not more than 64.
Dependencies are inferred from the claim text.