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US 5,042,617 AGranted
Method of reducing the presence of sludge in lubricating oils
AssigneeExxon Research & Engineering Co.
InventorsDarrell W. Brownawell, Warren Thaler
Life of this patent
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Abstract
Sludge can be effectively removed from a lubricating oil by contacting the oil with a dispersant functional group immobilized on a substrate. This results in improved engine cleanliness and control of viscosity increases.
Claims24
A method for reducing the presence of sludge in a lubricating oil which comprises
- (a) incorporating a dispersant functional group with an immobilized substrate, and
- (b) contacting the sludge in the lubricating oil with the dispersant functional group on the substrate, thereby causing at least a portion of the sludge in the lubricating oil to become immobilized on the substrate.
A method for reducing the presence of sludge in a lubricating oil circulating within the lubrication system of an internal combustion engine which comprises
- (a) incorporating a dispersant functional group with a substrate that is immobilized within the lubrication system of the engine, and
- (b) contacting the sludge in the lubricating oil with the dispersant functional group on the substrate, thereby causing at least a portion of the sludge in the lubricating oil to become immobilized on the substrate.
Dependencies are inferred from the claim text.