C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 297/00 (2006.01) C08F 8/04 (2006.01) C08F 297/04 (2006.01) C08L 53/02 (2006.01) C10M 143/10 (2006.01) C10M 143/12 (2006.01)
Patent
CA 2155686
The present invention provides asymmetric triblock copolymers which are useful as viscosity index improvers in oil compositions formulated for high performance engines. The triblock copolymers have the block structure hydrogenated polyisoprene-polystyrene- hydrogenated polyisoprene wherein the ratio of the number average molecular weights of the first and second hydrogenated polyisoprene blocks is at least 4.
Rhodes Robert Barnett
Stevens Craig Aldred
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Shell Internationale Research Maatschappij B.v.
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