Phosphorus salts of nitrogen containing copolymers and lubricants containing the same
AssigneeThe Lubrizol Corporation
InventorsMichael P. Gahagan, Matthew R. Sivik
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Abstract
This invention relates to a lubricating composition comprising a major amount of an oil of lubricating viscosity and a minor amount of a salt of at least one nitrogen containing polyacrylate and at least one phosphorus acid ester. The invention also relates to lubricating compositions and concentrates containing the same. The present phosphorus salts of the nitrogen containing copolymers provide improved dispersant, viscosity improver and antiwear properties to lubricating compositions.
Claims10
A lubricating composition comprising a major amount of an oil of lubricating viscosity and a minor amount of a salt of a phosphorus acid ester and a nitrogen containing polyacrylate wherein the poylacrylate is prepared from a combination of:
- a) methacrylic acid esters containing from 9 to 25 carbon atoms in the ester group, b) methacrylic acid esters containing 7 to 12 carbon atoms in the ester group and c) at least one nitrogen containing monomer wherein the nitrogen containing monomer is a vinyl hetrocyclic monomer selected from the group comprising a vinyl pyridine, vinyl imidazoline, vinyl pyrrolidinone, vinyl caprolactam or mixtures thereof.
Dependencies are inferred from the claim text.