LUBRICATING OIL COMPOSITIONS CONTAINING A TETRAALKYL-NAPTHALENE-1,8 DIAMINE ANTIOXIDANT
First Claim
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1. A lubricating oil composition comprising:
- a) at least one oil of lubricating viscosity;
b) an oil soluble 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
c) at least one additive selected from antioxidants, dispersants, and detergents.
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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.
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Citations
18 Claims
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1. A lubricating oil composition comprising:
- a) at least one oil of lubricating viscosity;
b) an oil soluble 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
c) at least one additive selected from antioxidants, dispersants, and detergents.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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) at least one oil of lubricating viscosity;
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4. The lubricating oil composition according to claim 3, wherein the ratio of component a) to component b) is from about 0.75:
- 1 to about 5;
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- 1 to about 5;
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5. The lubricating oil composition according to claim 2, wherein the total weight percent of the mixture of antioxidants in the composition is less than 5 weight percent.
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6. The lubricating oil composition according to claim 1, wherein R1, R2, R3 and R4 are each independently selected from alkyl groups each having from 1 to 10 carbon atoms.
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7. The lubricating oil composition according to claim 3, wherein component b) is selected from the group consisting of diphenylamine, monoalkylated diphenylamine, dialkylated diphenylamine, trialkylated diphenylamine, and mixtures thereof
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8. The lubricating oil composition according to claim 7, wherein component b) is selected from the group consisting of butyldiphenylamine, di-butyldiphenylamine, octyldiphenylamine, di-octyldiphenylamine, nonyldiphenylamine, di-nonyldiphenylamine, t-butyl-t-octyldiphenylamine, and mixtures thereof.
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9. The lubricating oil composition according to claim 2, wherein component b) is selected from the group consisting of phenyl-alpha-naphthylamine, phenyl-beta-naphthylamine, t-octylated N-phenyl-1-naphthylamine.
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10. The lubricating oil composition according to claim 2, wherein the at least one antioxidant is a hindered phenolic antioxidant.
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11. The lubricating oil composition according to claim 1, further comprising an oil soluble molybdenum compound.
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12. The lubricating oil composition according to claim 11, wherein the oil soluble molybdenum compound is an unsulfurized or sulfurized oxymolybdenum containing composition prepared by (i) reacting an acidic molybdenum compound and a basic nitrogen compound selected from the dispersant group consisting of succinimide, a carboxylic acid amide, a hydrocarbyl monoamine, a phosphoramide, a thiophosphoramide, a Mannich base, a dispersant viscosity index improver, or a mixture thereof in the presence of a polar promoter, to form an oxymolybdenum complex.
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13. The composition according to claim 12, wherein the basic nitrogen compound is a succinimide.
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14. The composition according to claim 2, further comprising an oil-soluble, phosphorus-containing, anti-wear compound selected from the group consisting of metal dithiophosphates, phosphorus esters, amine phosphates and amine phosphinates, sulfur-containing phosphorus esters, phosphoramides and phosphonamides.
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15. The composition according to claim 14, wherein said phosphorus esters are selected from the group consisting of phosphates, phosphonates, phosphinates, phosphine oxides, phosphites, phosphonites, phosphinites, and phosphines.
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16. The composition according to claim 14, wherein the oil-soluble, phosphorus-containing, anti-wear compound is a zinc dialkyldithiophosphate.
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17. A method for lubricating an internal combustion engine comprising supplying thereto the lubricant composition of claim 1.
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18. A method for improving the antioxidant performance of a lubricating oil formulated with an aminic or phenolic based antioxidant by supplying thereto an oil soluble 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.
Specification