| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve separation and crack resistance properties of an inner liner. <P>SOLUTION: The inner liner includes a first layer with a thickness of 0.05 mm to 0.6 mm which is a thermoplastic elastomer composition composed of a mixture of ≥60 mass% of a styrene-isobutylene-styrene triblock copolymer and ≤40 mass% of a C4 polymer as the polymer of the C4 monomer and a second layer with a thickness of 0.01 mm to 0.3 mm which is a thermoplastic elastomer composition composed of a mixture of at least ≥60 mass% of either a styrene-isoprene-styrene triblock copolymer or a styrene-isobutylene diblock copolymer and ≤40 mass% of the C4 polymer, wherein the second layer contacts a carcass ply 6, and the inner liner is characterized in that an average thickness Gs of a buttress region Rs from a tire maximum width position to a corresponding position Lu of a belt layer edge is thinner than an average thickness Gb of a bead region Rb. <P>COPYRIGHT: (C)2013,JPO&INPIT |
