C.sub.2 -C.sub.5 olefin oligomer compositions as shear stable viscosity
index improvers
    63.
    发明授权
    C.sub.2 -C.sub.5 olefin oligomer compositions as shear stable viscosity index improvers 失效
    C2-C5烯烃低聚物组合物作为剪切稳定粘度指数改进剂

    公开(公告)号:US5276227A

    公开(公告)日:1994-01-04

    申请号:US829816

    申请日:1992-02-03

    摘要: Liquid hydrocarbon lubricant viscosity index improver compositions are disclosed having high shear stability. The compositions comprise the homopolymer or copolymer product of the oligomerization of C.sub.3 to C.sub.5 alpha-olefin or mixtures thereof, with or without ethylene as co-monomer. The process is carried out under oligomerization conditions in contact with a reduced valence state Group VIB metal catalyst on porous support. The viscosity index improver of the invention has a regio-irregularity of at least 20%, weight average molecular weight between 6,000 and 30,000 and molecular weight distribution between 2 and 5.

    摘要翻译: 公开了具有高剪切稳定性的液体烃润滑剂粘度指数改进剂组合物。 所述组合物包含C 3 -C 5α-烯烃或其混合物的低聚的均聚物或共聚物产物,具有或不具有乙烯作为共聚单体。 该方法在与多价载体上的还原态VIB族金属催化剂接触的低聚条件下进行。 本发明的粘度指数改进剂的区域不均匀度至少为20%,重均分子量为6000至30,000,分子量分布为2至5。