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US 6,306,802 B1Granted
Mixed antioxidant composition
AssigneeExxon Chemical Patents Inc.
InventorHarold Shaub
Life of this patent
Estimating the term…
Abstract
The combination of a molybdenum compound and an aromatic amine has been found to produce a synergistic antioxidant effect when used as an antioxidant additive for lubricating oils. The combination has been found to be particularly effective under catalytic oxidation conditions, e.g. Fe catalysed oxidation of crankcase lubricating oils.
Claims16
A lubricating oil additive comprising a combination of an oil-soluble molybdenum-containing compound of general formula I:
- wherein R1, R2, R3 and R4 may be the same or different and each independently represent a C7 to C24 hydrocarbyl radical, X and X1 may be the same or different and independently represent S or O, and the Mo is in oxidation state V or less;
- and at least one oil-soluble aromatic amine.
A lubricating oil additive as claimed in any one of the preceding claims wherein X=X1=S.
Dependencies are inferred from the claim text.