发明名称 |
Olefin copolymer viscocity index improvers |
摘要 |
Oil soluble viscosity index improver composition comprising a mixture of: (A) at least one molecular weight degraded copolymer of ethylene and at least one other alpha-olefin monomer; and (B) at least one substantially undegraded copolymer of ethylene and at least one other alpha-olefin monomer. The ethylene alpha-olefin copolymers before degradation can be polymerized by a variety of available technologies including Ziegler-Natta, metallocene and diimine catalysis, as well as batch, continuous stirred tank and tubular reactors to produce copolymers having both broad or narrow molecular weight and compositional distributions. Use of degraded/non-degraded copolymer mixtures facilitates the preparation of viscosity index improvers for oils having targeted levels of shear stability index.
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申请公布号 |
US2003013623(A1) |
申请公布日期 |
2003.01.16 |
申请号 |
US20010845756 |
申请日期 |
2001.05.01 |
申请人 |
TSE KWOK-LEUNG;BRIGGS STUART |
发明人 |
TSE KWOK-LEUNG;BRIGGS STUART |
分类号 |
C08L23/04;C08L23/08;C10M143/00;C10M143/02;C10M157/00;(IPC1-7):C10M143/00;C08L23/00 |
主分类号 |
C08L23/04 |
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