COMPOSITION CONTAINING ETHYLENE/PROPYLENE/DIENE COPOLYMER AND POLYALKYLENE/OLEFIN COPOLYMER,申请号WO2004US11410-传众专利搜索

COMPOSITION CONTAINING ETHYLENE/PROPYLENE/DIENE COPOLYMER AND POLYALKYLENE/OLEFIN COPOLYMER

申请公布号：WO2004104083(A1)

申请号：WO2004US11410

申请日期：2004.04.14

申请公布日期：2004.12.02

申请人：

BRIDGESTONE CORPORATION;CHEN, ZHONG-REN;RADEMACHER, CHRISTINE

发明人：CHEN, ZHONG-REN;RADEMACHER, CHRISTINE

分类号：C08L23/08;C08L7/00;C08L9/00;C08L21/00;(IPC1-7):C08L21/00;C08L23/00

主分类号：C08L23/08

摘要：<p>A composition suitable for forming a sidewall for a tire includes a rubber composition which includes at least one rubber, an ethylene/propylene/diene terpolymer, and a polyalkylene copolymer. The rubber may include one or more natural or synthetic rubbers, such as butadiene rubbers and isoprene rubbers. The ethylene/propylene/diene terpolymer preferably has an ethylene content of at least 60 %. The polyalkylene copolymer may be a copolymer of a polyalkylene and an alpha-olefin, which is formed in a polymerization reaction involving a single site catalyst. The polyalkylene copolymer preferably has a high degree of crystallinity, being preferably at least about 90 % by weight ethylene, with a melting point in the range of 80 °C-120 °C. The presence of such a copolymer in the rubber composition markedly increases the resistance to crack growth and formation of cracks in the tire sidewall.</p>