VI improver and composition containing same
AssigneeShell Oil Company
InventorsVivek K. Soni, Dale L. Handlin, Jr., Carl L. Willis
Life of this patent
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Abstract
An improved viscosity index improver and an oil composition containing such a viscosity index improver are disclosed. The viscosity index improver is a carboxyl functionalized block copolymer which comprises of at least one monoalkenyl aromatic hydrocarbon polymer block and at least one conjugated diolefin polymer block. The oil can be selected from the group consisting of crude oils, mineral and synthetic lubricating oils, fuel oils, diesel oils, hydraulic oils, automatic transmission oils, and mixtures thereof.
Claims17
An oil composition comprising a selectively hydrogenated, block copolymer to which has been grafted carboxyl functional groups comprising at least one monoalkenyl aromatic hydrocarbon unit polymer block and at least one hydrogenated conjugated diolefin polymer block as a viscosity index improver, said block copolymer being functionalized in the monoalkenyl aromatic hydrocarbon polymer block.
Dependencies are inferred from the claim text.