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US 11,518,954 B2Granted
Zinc-free lubricating composition
AssigneeThe Lubrizol Corporation
InventorsEwan E. Delbridge, Patrick E. Mosier
Life of this patent
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Abstract
The invention is directed to a zinc-free lubricating composition for an internal combustion engine containing a phosphorus anti-wear agent, an ashless antioxidant, and a metal-free basic detergent. The lubricating composition provides wear protection, deposit control, and improved acid control with reduced levels of metal-containing additives.
Claims12
A zinc-free lubricating composition comprising:
- (a) an oil of lubricating viscosity;
- (b) a zinc-free phosphorus-containing antiwear agent selected from a phosphite, a phosphonate, and an amine phosphate salt in an amount to deliver 0.025 weight percent to about 0.086 weight percent of phosphorous to the composition;
- (c) at least one ashless detergent comprising a tetra-hydrocarbyl ammonium salicylate having a total base number (D2896) of at least about 50 mg KOH/g and a total acid number (TAN) of less than about 5 mg KOH/g as measured by ASTM D664 where the hydrocarbyl is selected from ethyl, propyl, and butyl;
- and (d) an ashless antioxidant.
1 more element
A method of lubricating an internal combustion engine comprising lubricating the engine with a lubricant composition comprising:
- (a) an oil of lubricating viscosity;
- (b) a zinc-free phosphorus-containing antiwear agent selected from a phosphite, a phosphonate, and an amine phosphate salt in an amount to deliver 0.025 weight percent to about 0.086 weight percent of phosphorous to the composition;
- (c) at least one ashless detergent comprising a tetra-hydrocarbyl ammonium salicylate having a total base number (D2896) of at least about 50 mg KOH/g and a total acid number (TAN) of less than about 5 mg KOH/g as measured by ASTM D664 where the hydrocarbyl is selected from ethyl, propyl, and butyl;
- and (d) an ashless antioxidant.
1 more element
Dependencies are inferred from the claim text.