Grease composition with improved antiwear properties
AssigneeChevron Chemical Company
InventorStuart H. Brown
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Abstract
An antiwear additive has an alkali metal borate; and a thiadiazole compound. That thiadiazole compound may be a 2,5-dimercapto-1,3,4-thiadiazole, a 2-alkylpolythio-5-mercapto-1,3,4-thiadiazole, or a 2-alkylestermercapto-5-mercapto-1,3,4-thiadiazole. If the thiadiazole compound is a 2-alkylpolythio-5-mercapto-1,3,4-thiadiazole or a 2-alkylestermercapto-5-mercapto-1,3,4-thiadiazole, the alkyl group has from one to twenty carbon atoms. If the thiadiazole compound is a 2-alkylpolythio-5-mercapto-1,3,4-thiadiazole, the polythio group has from two to eight sulfur atoms. This antiwear additive can be used with a base grease in a grease composition.
Claims5
An additive comprising:
- (a) an alkali metal borate;
- and
- (b) a thiadiazole compound selected from the group consisting of:
- (1) 2,5-dimercapto-1,3,4-thiadiazole;
- (2) 2-alkylthio-5-mercapto-1,3,4-thiadiazole, wherein the alkyl group has from one to fourteen carbon atoms;
- (3) 2-alkylpolythio-5-mercapto-1,3,4-thiadiazole, wherein the alkyl group has from one to fourteen carbon atoms, and the polythio group has from two to eight sulfur atoms;
- and
- (4) 2-alkylestermercapto-5-mercapto-1,3,4-thiadiazole, wherein the alkyl group has from three to twenty carbon atoms.
Dependencies are inferred from the claim text.