公开(公告)号：WO0022015A9

公开(公告)日：2000-10-12

申请号：PCT/US9922091

申请日：1999-09-23

Applicant: EXXON CHEMICAL PATENTS INC

Inventor： LIOTTA RON ,  RAVISHANKAR PERIAGARAM S

IPC: C08J5/00 ,  C08F4/659 ,  C08F10/00 ,  C08F210/18 ,  C08L23/16 ,  F16G5/04 ,  F16G5/00

CPC classification number: F16G5/04 ,  C08F4/65908 ,  C08F10/00 ,  C08F210/18 ,  C08L23/16 ,  C08F4/65927 ,  C08F4/68 ,  C08F210/06 ,  C08F2500/25 ,  C08F2500/17

Abstract: Motor vehicle parts based on an ethylene, alpha-olefin, diene monomer elastomeric polymers exhibit excellent low temperature compression set. Previously, such compression set performance in the amorphous region was believed to be non-responsive to ethylene content once the amorphous region was reached. However, within certain ranges, ethylene content has been shown to have an effect on low temperature compression set even in the amorphous region. These motor vehicle parts are particularly useful where extremes of ambient temperatures maybe incurred. In a preferred embodiment, the invention is a vehicle part, such a brake part or belt including an ethylene, alpha -olefin, diene elastomeric polymer. The elastomeric polymer has a low ethylene content, and the vehicle part made from a compound based on the elastomeric polymer will have improved low temperature compression set. The vehicle part comprises the elastomeric polymer where the polymer has ethylene present in the range of from 50-60 mole percent, ethyldiene norbornene present in the range of from 0.2-5 mole percent and an alpha -olefin, selected from propylene, hexene-1 and octene-1, where the alpha -olefin makes up the remainder of the elastomeric polymer. The ethylene composition distribution of the elastomeric polymer is such that the ethylene in 90 % of the polymer fractions varies by no more than +/- 4 % by weight. The Mw/Mn will be in the range of 2-4, the inherent viscosity in the range of 1.2-3.2 and the Mooney Viscosity (1+4) @ 125 DEG C in the range of from 10-80. The vehicle part will have an instantaneous compression set at -40 DEG C, less than 80 %.

Abstract translation: 基于乙烯，α-烯烃，二烯单体弹性体聚合物的汽车零件表现出优异的低温压缩变定。 以前，一旦达到无定形区域，认为无定形区域中的这种压缩永久变形性能对乙烯含量无响应。 然而，在一定的范围内，即使在非晶区域，乙烯含量也显示出对低温压缩变定具有影响。 这些机动车辆部件在可能发生极端环境温度的情况下特别有用。 在一个优选的实施方案中，本发明是车辆部件，例如包括乙烯，α-烯烃，二烯弹性体聚合物的制动部件或带。 弹性体聚合物具有低的乙烯含量，并且由基于弹性体聚合物的化合物制成的载体部分将具有改进的低温压缩永久变形。 载体部分包含弹性体聚合物，其中聚合物的乙烯含量为50-60％（摩尔），乙二烯降冰片烯的含量为0.2-5％（摩尔），α-烯烃选自丙烯，己烯-1 和辛烯-1，其中α-烯烃构成弹性体聚合物的剩余部分。 弹性体聚合物的乙烯组成分布使得90％聚合物部分中的乙烯变化不超过+/- 4重量％。 Mw / Mn在2-4的范围内，特性粘度在1.2-3.2范围内，125℃时的门尼粘度（1 + 4）在10-80的范围内。 车辆部件将具有-40℃的瞬时压缩率，小于80％。