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US 4,902,435 AGranted
Grease with calcium soap and polyurea thickener
AssigneeAmoco Corporation
InventorJohn A. Waynick
Life of this patent
Estimating the term…
Abstract
A high performance lubricating grease effectively lubricates and greases front-wheel drive joints. The front-wheel drive grease has excellent extreme pressure properties and antiwear qualities and is economical, non-toxic and safe. In one preferred form, the front-wheel drive grease comprises a base oil, a thickener comprising polyurea and calcium complex soap, and an additive package comprising tricalcium phosphate and calcium carbonate.
Claims6
A lubricating grease comprising:
- a base oil;
- an additive package comprising a combined carbonate and phosphate additive package, said combined additive package comprising both a carbonate and a phosphate in the absence of sulfur-containing compounds comprising arylene sulfide polymers, said carbonate selected from the group consisting of a carbonate of a Group 2a alkaline earth metal and a carbonate of a Group 1a alkali metal, said phosphate selected from the group consisting of a phosphate of a Group 2a alkaline earth metal and a phosphate of a Group 1a alkali metal, said alkaline earth metal selected from the group consisting of beryllium, magnesium, calcium, strontium, and barium, and said alkali metal selected from the group consisting of lithium, sodium, and potassium;
- and
- a blended thickener comprising
- a urea-containing thickener selected from the group consisting of monourea, diurea, and polyurea;
- and
- a calcium-containing thickener comprising an anhydrous simple calcium soap.
4 more elements
Dependencies are inferred from the claim text.