| 摘要 |
<p>PURPOSE:Title rubber composition which provides tires having low rolling resistance, excellent brake performances on wet road surfaces and tolerable abrasion resistance, prepared by compounding three different specific stock rubbers, carbon black, a vulcanization accelerator, sulfur, etc. CONSTITUTION:Forty to seventy (40-70)pts.wt. of carbon black, 0-20pts.wt. of a process oil, a vulcanization accelerator, and sulfur are added to 100pts.wt. of a rubber stock comprising (a) 5-30pts.wt. of polyisobutylene, polyisoprene rubber or a mixture thereof (all rubbers have a Cl or Br content of 1.0-2.0wt%), (b) 40-95pts.wt. of natural rubber or polyisoprene rubber having at least 90% of cis-1,4-addition units and (c) polybutadiene rubber having up to 20% of 1,2- addition units, in an amount which is below 50pts.wt. and below 10a-50pts.wt. (line A in Fig.) and further below a-20pts.wt. (line C in Fig.), the sum of (a), (b) and (c) being 100pts.wt.</p> |
