| 摘要 |
A power transmission belt (10) with a good balance of high temperature resistance, good belt durability and low temperature crack resistance. The main belt body portion of the power transmission belt is manufactured from a n elastomeric material comprising 100 parts by weight of an at least partially hydrogenated nitrile group-containing copolymer rubber, and from about 0.5 t o about 50 parts per hundred weight of said rubber of a fiber reinforcement having a length to diameter ratio of greater than 10:1. The nitrile group- containing copolymer rubber preferably comprises (1) from about 5 to about 4 0 percent of unsaturated nitrile monomer units, (2) from about 1 to about 80 percent of units of at least one second monomer selected from the group consisting of fluorine-free unsaturated carboxylic acid ester monomer units and fluorine-containing vinyl monomer units, or any monomer possessing the characteristic of lowering the glass transition temperature of the rubber; ( 3) up to about 20 percent of conjugated diene monomer units and (4) the balance being hydrogenated conjugated diene monomer units, preferably wherein the su m of the contents of the monomer units (1) and (2) is from about 30 to 90 percent by weight and the sum of the contents of the monomer units (3) and ( 4) is from about 10 to about 70 percent by weight. The use of the fiber reinforcement in the nitrile group-containing, highly saturated copolymer rubber provides substantially improved low temperature crack resistance whil e improving the high temperature resistance of the belt.
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