| abstract |
[PROBLEMS] To provide a resin to be added to a tire material rubber for improving traction and handling of a tire, and a rubber composition containing the resin. A polymerization reaction product of dimethyldicyclopentadiene and limonene, having a softening point ranging from about 50 to about 220 ° C. and a molecular weight ranging from about 500 to about 42,000, and natural rubber, polyisoprene, Rubber 10 such as styrene-butadiene copolymer rubber A rubber composition suitable for a diamond tread, containing 5 to 50 parts by weight of the resin per 0 parts by weight. |