| 摘要 |
<p>In the present invention, a novolac-type phenolic resin which does not require cold storage is used as a base resin for a resin pulley. To improve dimensional stability, strength, thermal shock resistance and abrasion resistance of the resin pulley, the pulley is formed with a resin composition containing the novolac-type phenolic resin, silica which is difficult to be abraded itself to be an abrasive powder and serves to grind and abrade dust with contact, and 5 to 20 % by weight of alumina, harder than silica, having an average particle diameter of 5 µm or larger.</p> |
