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    Viscosity index improver and composition containing same
    83.
    发明授权
    Viscosity index improver and composition containing same 失效
    粘度指数改进剂和含有它的组合物

    公开(公告)号：US4877836A

    公开(公告)日：1989-10-31

    申请号：US198542

    申请日：1988-05-24

    申请人： Robert B. Rhodes

    发明人： Robert B. Rhodes

    IPC分类号： C10M143/00 ,  C08L53/00 ,  C08L53/02 ,  C10L1/16 ,  C10M107/14 ,  C10M143/12 ,  C10N30/02 ,  C10N40/25 ,  C10N60/02

    CPC分类号： C10M143/12 ,  C08L53/02 ,  C10M2205/04 ,  C10M2205/06 ,  C10N2240/02 ,  C10N2240/04 ,  C10N2240/042 ,  C10N2240/044 ,  C10N2240/046 ,  C10N2240/08 ,  C10N2240/401 ,  C10N2250/10 ,  C10N2270/02

    摘要： A polymeric blend particularly useful as a VI improver, which polymeric blend comprises a selectively hydrogenated asymmetric radial polymer comprising a plurality of polymeric arms containing hydrogenated conjugated diolefin monomer units and at least one block copolymer arm comprising a single polymeric block containing predominantly monoalkenyl aromatic hydrocarbon monomer units and a single polymeric block containing predominantly hydrogenated conjugated diolefin monomer units and a selectively hydrogenated linear diblock copolymer containing a single polymeric block containing principally monoalkenyl aromatic hydrocarbon monomer units and a single polymeric block containing predominantly hydrogenated conjugated diolefin monomer units. Both polymers in the blend will be selectively hydrogenated so as to convert (saturate) at least 95% of the ethylenic unsaturation initially contained therein. When used as a VI improver, the polymeric blend unexpectedly improves the thickening efficiency over and above the thickening efficiency that would be expected from a consideration of the individual contribution made by each of the polymers separately. The monoalkenyl aromatic hydrocarbon polymer blocks in both polymers is preferably styrene and the conjugated diolefin in both polymers is preferably isoprene. Preferably, both polymers are selectively hydrogenated so as to convert (saturate) at least 99% of the ethylenic unsaturation initially contained therein.

    Viscosity index improver with high thickening power
    87.
    发明授权
    Viscosity index improver with high thickening power 失效
    粘稠度指数改进剂，具有较高的增稠力

    公开(公告)号：US4412087A

    公开(公告)日：1983-10-25

    申请号：US331421

    申请日：1981-12-16

    申请人： William J. Trepka

    发明人： William J. Trepka

    IPC分类号： C08C19/02 ,  C08F8/04 ,  C10M143/00 ,  C10M1/18

    CPC分类号： C10M143/00 ,  C08C19/02 ,  C08F8/04 ,  C10M2205/00 ,  C10M2205/02 ,  C10M2205/04 ,  C10M2205/06

    摘要： Hydrogenated random block conjugated diene/monovinylarene copolymers with a terminal monovinylarene block having a diene content in the range of 44 to 70 weight percent, normalized vinyl in the range 30.2-51.3 percent, percent vinyl based on copolymer plus percent styrene in the range 59.8-71.5 percent, and molecular weight M.sub.n in the range 94,000-199,000, used as viscosity index improver in lubricating oil, exhibits unusually high thickening power, yet provides viscosity index, pour point, and shear loss at very desirable levels.

    摘要翻译： 氢化无规嵌段共轭二烯/单乙烯基芳烃共聚物与二烯含量在44-70重量％范围内的末端单乙烯基芳烃嵌段，30.2-51.3％范围内的归一化乙烯基，基于共聚物的乙烯基加成百分比苯乙烯在59.8- 71.5％，分子量Mn在94,000-199,000范围内，用作润滑油中的粘度指数改进剂，显示出非常高的增稠力，但在非常理想的水平下提供粘度指数，倾点和剪切损失。