| 摘要 |
PROBLEM TO BE SOLVED: To improve wet performance from the traveling initial stage to the traveling final stage by using a rubber composition containing fiber in which a foaming agent is contained in a tread. SOLUTION: Polymer obtained by adding a foaming agent to polyvinyl-alcohol polymer, the vinylalcohol unit of which is 50 mol or more and the average polymerization degree of which is 1000, and the saponification degree is under 80% is used as a raw material in the fiber used. The spun-out fiber is not subject to treatment for applying water resisting property such as formal formation, acetal formation or the like. Mixing of a foaming agent contained water soluble fiber preferably ranges from 1 pt.wt. to 40 pts.wt. to 100 pts.wt. of rubber component, and further preferably it ranges from 2 pts.wt. to 30 pts.wt.. The length of the foaming agent containing short fiber is preferably 10 mm or less, and further preferably it is 5 mm or less.
|
