公开(公告)号：US20040230002A1

公开(公告)日：2004-11-18

申请号：US10438532

申请日：2003-05-15

Applicant: BRIDGESTONE CORPORATION

Inventor： Zhong-Ren Chen ,  Christine M. Rademacher

IPC: C08L023/00 ,  C08L023/04 ,  C08F008/00

CPC classification number: C08L21/00 ,  C08L7/00 ,  C08L9/00 ,  C08L23/0815 ,  C08L2312/00 ,  C08L2666/06 ,  C08L2666/08

Abstract: 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 null-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 80null C.-120null 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.

Abstract translation: 适用于形成轮胎侧壁的组合物包括橡胶组合物，其包括至少一种橡胶，乙烯/丙烯/二烯三元共聚物和聚亚烷基共聚物。 橡胶可以包括一种或多种天然或合成橡胶，例如丁二烯橡胶和异戊二烯橡胶。 乙烯/丙烯/二烯三元共聚物优选具有至少60％的乙烯含量。 聚亚烷基共聚物可以是在涉及单位点催化剂的聚合反应中形成的聚亚烷基和α-烯烃的共聚物。 聚亚烷基共聚物优选具有高结晶度，优选至少约90重量％的乙烯，熔点在80℃-120℃的范围内。这种共聚物在橡胶组合物中的存在显着 增加了轮胎侧壁中裂纹扩展的阻力和裂纹的形成。