SYNERGISTIC LUBRICATING OIL COMPOSITION CONTAINING A MIXTURE OF A NITRO-SUBSTITUTED DIARYLAMINE AND A DAIRYLAMINE
First Claim
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1. A composition comprising a lubricating oil and an oil soluble synergistic mixture of antioxidants, said mixture comprising:
- a) from 0.1 to 10 weight percent of a first antioxidant according to formula I;
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Abstract
Disclosed is a lubricating oil composition containing an oil of lubricating viscosity and a particularly effective mixture of a nitro-substituted diphenylamine and a diarylamine which together provide superior oxidation inhibition.
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Citations
27 Claims
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1. A composition comprising a lubricating oil and an oil soluble synergistic mixture of antioxidants, said mixture comprising:
a) from 0.1 to 10 weight percent of a first antioxidant according to formula I; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
- 25. An antioxidant system useful in lubricating oil compositions comprising a major amount of a lubricating oil composition and an oil soluble antioxidant system selected from a mixture of a secondary diarylamine and a nitro-substituted secondary diarylamine.
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27. A method to delay the onset of oxidation in a lubricating oil composition containing a lubricating oil and a secondary diarylamine antioxidant, said method comprising adding to said lubricating oil composition an effective amount of a nitro containing compound of formula I:
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