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US 4,788,361 AGranted
Polymeric viscosity index improver and oil composition comprising the same
AssigneeShell Oil Company
InventorsDanford H. Olson, Dale L. Handlin
Life of this patent
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Abstract
A triblock copolymer VI improver comprising terminal hydrogenated polyisoprene blocks and a central polymeric block containing predominantly monoalkenyl aromatic hydrocarbon monomer units. Oil compositions comprising such triblock copolymer VI improvers exhibit a good balance between thickening efficiency and mechanical shear stability combined with relatively high HTHSR viscosities.
Claims5
A lubricating oil composition comprising a triblock copolymer containing terminal hydrogenated polyisoprene blocks and a central polymeric block containing predominantly monoalkenyl aromatic hydrocarbon monomer units.
Dependencies are inferred from the claim text.