| 摘要 |
PROBLEM TO BE SOLVED: To improve lower heating property without sacrificing abrasion resistance and tear resistance of a tread rubber by using a specific silane coupling agent and carbon black at specific rate. SOLUTION: A tread rubber is used, in which against rubber component 100 wt. part constituted of butadiene rubber 10-60 pts.wt. and natural rubber 40-90 pts.wt. carbon black 35-65 pts.wt. having nitrogen adsorption specific surface area over 120 m2/g, and dibutylphthalate oil sucking quantity over 110 cm3/100 g, and a silane coupling agent of 0.2-5 pts.wt. expressed by the formula and of trisulfidesilane content (y is 3) over 25% and polysulfidesilane content (y is over 5) under 50% against the whole polysulfide silane component quantity are added thereto. In the formula, (n) is an integer of 1-3, (m) is an integer of 1-9, and (y) is a positive number over 1 and has distribution.
|
