Lubricating Composition Comprising Poly (Isobutylene) /Poly (Vinyl Aromatic) Block Copolymer
AssigneeThe Lubrizol Corporation
InventorsMichael R. Sutton, William R. S. Barton, David Price
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Abstract
The invention provides a lubricating composition containing an oil of lubricating viscosity and a block copolymer of a poly(olefin) block, such as poly(isobutylene) (PIB) and a polyvinyl aromatic) block, such as poly(styrene), wherein the copolymer is optionally functionalized or grafted. The invention further provides a method of using the block copolymer to control deposits in a lubricating oil composition.
Claims16
A lubricating composition comprising:
- an oil of lubricating viscosity and a block copolymer comprising at least one poly(isobutylene) (PIB) polymer block (block A) and at least one poly(vinyl aromatic) (PVA) polymer block (block B) with mole ratio of block A/(block A+B) of 0.5 to 0.97.
A method of controlling deposits in lubricant compositions comprising adding to the lubricant composition a block copolymer comprising at least one PIB polymer block (block A) and at least one PVA polymer block (block B) with mole ratio of block A/(block A+B) of 0.5 to 0.97.
Dependencies are inferred from the claim text.