Lubricating oil compositions containing a tetraalkyl-napthalene-1,8 diamine antioxidant
AssigneeChevron Oronite Company LLC
InventorsRichard E. Cherpeck, Carrie Y. Chan, Gaurav Bhalla
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Abstract
Disclosed is a lubricating oil composition containing an oil of lubricating viscosity and a N,N,N′,N′-tetraalkyl-naphthalene-1,8-diamine and at least one additive selected from antioxidants, dispersants, and detergents which together provide superior oxidation inhibition and are suitable lubricants for automotive and truck crankcase lubricants; as well as transmission lubricants, gear lubricants, hydraulic fluids, compressor oils, diesel and marine lubricants.
Claims15
A lubricating oil composition comprising at least one oil of lubricating viscosity and an oil soluble antioxidant herein the antioxidant is a mixture comprising:
- a) from 0.1 to 10 weight percent of a first antioxidant according to formula I:
- wherein R1, R2, R3 and R4 are each independently selected from alkyl groups each having from 1 to 20 carbon atoms;
- and
- b) from 0.01 to 10 weight percent of a second antioxidant selected from the formula
- wherein Ra and Rb are each independently aryl from 6 to 10 carbon atoms which may be unsubstituted or substituted with one or two alkyl groups each having from 1 to 20 carbon atoms.
A lubricating oil composition comprising at least one oil of lubricating viscosity and an oil soluble antioxidant wherein the antioxidant is a mixture comprising:
- a) from 0.1 to 2 weight percent of a first antioxidant according to formula I:
- wherein R1, R2, R3 and R4 are each independently selected from alkyl groups each having from 1 to 20 carbon atoms;
- and
- b) from 0.1 to 2 weight percent of a second antioxidant selected from the formula
- wherein Ra and Rb are each independently aryl from 6 to 10 carbon atoms which may be unsubstituted or substituted with one or two alkyl groups each having from 1 to 20 carbon atoms.
Dependencies are inferred from the claim text.