| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire which is manufactured under specified vulcanizing conditions and is excellent in the heat aging resistance without lowering its productivity. SOLUTION: A rubber composition for a tread and a rubber composition for a belt cord composing the pneumatic tire are combined, both of the rubber compositions having a rubber composition containing a vulcanization accelerator containing a benzothiazole radical of 0.5 to 2 pts.wt. for a diene based rubber of 100 pts.wt. The pneumatic tire is manufactured under the vulcanizing condition that the constant R representing the ratio of the vulcanizing speeds of both of the rubber compositions, R=T95t/T95b, satisfies the following equation, (-0.1×Sb+2.2)/(-0.2×St+3.4)≤R≤(-0.2×Sb+3.4)/(-0.1×St+2.2), where St is a quantity of S contained in the rubber composition for the tread, T95t is a 95% vulcanization time of the rubber composition for the tread measured by a rheometer, Sb is a quantity of S contained in the rubber composition for the belt cord, and T95b is a 95% vulcanization time of the rubber composition for the belt cord measured by the rheometer. COPYRIGHT: (C)2006,JPO&NCIPI |
