C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 297/04 (2006.01) C10M 143/12 (2006.01)
Patent
CA 2152992
The present invention provides star polymers, useful as viscosity index improvers in oil compositions, having triblock copolymer arms of hydrogenated polyisoprene and polystyrene wherein the polystyrene is placed near the core of the star polymer to provide excellent low temperature performance and finishability as a polymer crumb; a process for their preparations; and lubricating oil compositions and lubricating oil concentrates containing them.
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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