CPC B60C 11/005 (2013.01) [B60C 2011/0033 (2013.01); C08L 2205/03 (2013.01)] | 11 Claims |
1. A tire having a tread comprising:
(a) a first tread cap layer which is adapted to being ground contacting, wherein the first tread cap layer comprises a first rubber composition; and
(b) a second tread cap layer arranged radially inside of the first tread cap layer and supporting the first tread cap layer, wherein the second tread cap layer comprises a second rubber composition which is different from the first rubber composition;
wherein a maximum radial thickness of the second tread cap layer is within a range of 60% to 90% of a maximum radial thickness of the first tread cap layer,
wherein the rebound resilience of the first rubber composition, as determined at a temperature of 0° C. according to DIN 53512, is within the range of 17% to 25%, and wherein the rebound resilience of the second rubber composition, as determined at a temperature of 0° C. according to DIN 53512, is within the range of 22% to 35%, and wherein said rebound resilience of the first rubber composition is at least 5% lower than said rebound resilience of the second rubber composition as determined at a temperature of 0° C. according to DIN 53512, and
wherein the rebound resilience of the first rubber composition, as determined at a temperature of 100° C. according to DIN 53512, is within the range of 45% to 65%, and a rebound resilience of the second rubber composition, as determined at a temperature of 100° C. according to DIN 53512, is within the range of 60% to 75%, and wherein said rebound resilience of the second rubber composition, as determined at a temperature of 100° C., is at least 3% higher than said rebound resilience of the first rubber composition, as determined at a temperature of 100° C. according to DIN 53512,
wherein the first rubber composition is comprised of 5 phr to 20 phr of a polybutadiene rubber having a glass transition temperature within a range of −100° C. to −115° C., and 80 phr to 95 phr of a solution styrene butadiene rubber, wherein the solution styrene-butadiene rubber has a styrene content which is within the range of 4% to 20%, and wherein the solution styrene-butadiene rubber has a vinyl content which is within the range of 10% to 40%, and
wherein the second rubber composition is comprised of 5 phr to 20 phr of a polyisoprene rubber, 5 phr to 20 phr of polybutadiene rubber, and 60 to 90 phr of the solution styrene-butadiene rubber having a styrene content which is within the range of 4% to 20% and a vinyl content which is within the range of 10% to 40%.
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