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US 10,519,396 B2Granted
Method of lubricating a mechanical device
AssigneeThe Lubrizol Corporation
InventorsSuzanne Patterson, Brian B. Filippini, Tomoya Higuchi, William R. S. Barton
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Abstract
A lubricant composition comprising an oil of lubricating viscosity and 0.01 to 5 percent by weight of a substantially sulfur-free alkyl phosphate amine salt, where at least 30 mole percent of the phosphorus atoms are in an alkyl pyrophosphate salt structure, exhibits good antiwear performance, even in the presence of corrosion inhibitor additives. In the phosphate amine salt, at least 80 mole percent of the alkyl groups are typically secondary alkyl groups of 3 to 12 carbon atoms.
Claims34
A lubricating composition for lubricating a mechanical device, comprising:
- (a) an oil of lubricating viscosity;
- and
- (b) about 0.01 to about 5 percent by weight of a substantially sulfur-free alkyl phosphate amine salt wherein at least about 30 mole percent of the phosphorus atoms are in an-alkyl pyrophosphate salt structure;
- wherein at least about 80 mole percent of the alkyl groups are secondary alkyl groups of about 3 to about 12 carbon atoms;
- and
- (c) a corrosion inhibitor comprising a thiadiazole compound;
- (d) an extreme pressure agent;
- and
- wherein the antiwear additive delivers a phosphorous level of from 200 ppm to 3000 ppm.
6 more elements
Dependencies are inferred from the claim text.