Tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorKazuchika SUGAHARA
Life of this patent
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Abstract
Provided is a tire with a tread portion having a circumferential groove communicating in the circumferential direction, wherein the cap rubber layer forming the tread portion is formed from a rubber composition which contains 40 parts by mass or more and 80 parts by mass or less of styrene-butadiene rubber (SBR) having a styrene content of 25% by mass or less, and 60 parts by mass or more of a filler with respect to 100 parts by mass of the rubber component, and has a loss tangent 10° C. tan δ of less than 0.28, and a glass transition temperature Tg (° C.) of −40° C. or lower; and the glass transition temperature Tg (° C.) and the depth G (mm) of the circumferential groove satisfy Tg≤−0.5×G−35; and an object of the present invention is to improve off-road performance of a tire.
Claims11
A tire with a tread portion having a circumferential groove communicating in the circumferential direction, wherein
- the cap rubber layer forming the tread portion is formed from a rubber composition which contains
- 40 parts by mass or more and 80 parts by mass or less of styrene-butadiene rubber (SBR) having a styrene content of 25% by mass or Less in 100 parts by mass of the rubber component, and 60 parts by mass or more of a filler with respect to 100 parts by mass of the rubber component, and has
- a loss tangent 10° C. tan δ measured under the conditions of temperature of 10° C., frequency of 10 Hz, initial strain of 5%, and dynamic strain rate of 1% and in deformation mode;
- tensile of less than 0.28, and
- a glass transition temperature Tg (° C.) of −40° C. or lower;
- and
- the glass transition temperature Tg (° C.) and the depth G (mm) of the circumferential groove satisfy the following (formula 1).
- Tg≤−0.5×G−35 (formula 1)
Dependencies are inferred from the claim text.