| 摘要 |
Disclosed is a rubber composition for a transmission belt comprising 100 parts by mass of an ethylene-a-olefin elastomer and 32 to 100 parts by mass of a metal salt of an a,ß-unsaturated carboxylic acid incorporated in the ethylene-a-olefin elastomer. The ethylene-a-olefin elastomer contains 5 to less than 40% by mass in total of at least one of an ethylene propylene diene monomer rubber, an ethylene butene copolymer, and an ethylene octene copolymer that have an ethylene content of 66 to 85% by mass. The rubber composition does not contain an elastomer other than the ethylene-a-olefin elastomer or contains less than 10 parts by mass of an elastomer other than the ethylene-a-olefin elastomer. A transmission belt (B) comprises a pulley contact part which has been formed using the rubber composition.
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