Viscosity index improvers for lubricating oil compositions

Details Viscosity index improvers for lubricating oil compositions Viscosity index improvers for lubricating oil compositions

C - Chemistry, Metallurgy

08

F

C08F 293/00 (2006.01) C08F 236/06 (2006.01) C08F 236/08 (2006.01) C08F 297/04 (2006.01) C10M 143/12 (2006.01)

Patent

CA 2472506

A polymer suitable for use as a viscosity index improver for lubricating oil compositions, which is at least one, at least partially hydrogenated linear or star-shaped random copolymer of isoprene and butadiene, in which at least 70 wt. % of the butadiene is incorporated into the polymer as 1, 4 units and the weight ratio of isoprene addition product to butadiene addition product in the copolymer is in a range of from about 90:10 to about 70:30.

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