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US 5,397,487 AGranted
Lubricating oil for inhibiting rust formation
AssigneeExxon Research & Engineering Co.
InventorsLilianna Z. Pillon, Lloyd E. Reid, Andre E. Asselin
Life of this patent
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Abstract
A combination of succinic anhydride amine derivatives and tetra propenyl succinic acid derivative rust inhibitors has been found to be synergistically effective in reducing the formation of rust in lubricating oils.
Claims3
A lubricating oil composition which comprises a major amount of a lubricating oil basestock selected from the group consisting of polyalphaolefin synthetic base oil and slack wax isomerate wherein the basestock contains at least about 95 wt. % of hydrocarbon saturates and a minor synergistic rust inhibiting amount of an additive combination comprising
- (a) a succinic anhydride amine of the formula ##STR4## wherein R.sub.1 and R.sub.2 are each independently alkyl or alkenyl of 1 to 20 carbon atoms, and (b) a mixture of about 75 wt. % tetrapropenyl succinic acid and about 25 wt. % monoester of tetrapropenyl succinic acid with HO(CH.sub.2).sub.3 OH;
- wherein the weight ratio of (b) to (a) is greater than zero and less than about 1:1.
Dependencies are inferred from the claim text.