LUBRICATING OIL COMPOSITIONS CONTAINING A TETRAALKYL-NAPTHALENE-1,8 DIAMINE ANTIOXIDANT

• US 20100152079A1
• Filed: 12/16/2008
• Published: 06/17/2010
• Est. Priority Date: 12/20/2007
• Status: Active Grant

• Current Assignee: Chevron Oronite Company LLC (Chevron Corp.)
• Original Assignee: Chevron Oronite Company LLC (Chevron Corp.)
• Inventors: Bhalla, Gaurav, Cherpeck, Richard E., Chan, Carrie Y.
• Granted Patent: US 8,623,798 B2
• Time in Patent Office: Days
• US Class Current: 508/362
• CPC Class Codes: C10M 133/12 having amino groups bound to a carbon atom of a six-membered aromatic ring
• CPC Class Codes: C10M 141/06 at least one of them being an organic nitrogen-containing compound
• CPC Class Codes: C10M 2203/1006 used as base material
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/027 Neutral salts thereof
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/065 Phenyl-Naphthyl amines
• CPC Class Codes: C10M 2215/068 having amino groups bound to polycyclic aromatic ring systems, i.e. systems with three or more condensed rings
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2223/043 Ammonium or amine salts thereof
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10M 2223/047 Thioderivatives not containing metallic elements
• CPC Class Codes: C10M 2223/063 Ammonium or amine salts
• CPC Class Codes: C10M 2223/08 having phosphorus-to-nitrogen bonds
• CPC Class Codes: C10M 2227/066 derived from Mo or W
• CPC Class Codes: C10M 2227/09 Complexes with metals
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2030/10 Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/70 Soluble oils
• CPC Class Codes: C10N 2040/04 : Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• CPC Class Codes: C10N 2040/08 : Hydraulic fluids, e.g. brake-fluids
• CPC Class Codes: C10N 2040/252 : Diesel engines
• CPC Class Codes: C10N 2040/30 : Refrigerators lubricants or compressors lubricants

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.

Claims

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.

2. The lubricating oil composition according to claim 1, wherein the at least one additive is an antioxidant.

3. The lubricating oil composition according to claim 2, wherein 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 R^a and R^b 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.

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;

1.

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.

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.

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

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.

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.

10. The lubricating oil composition according to claim 2, wherein the at least one antioxidant is a hindered phenolic antioxidant.

11. The lubricating oil composition according to claim 1, further comprising an oil soluble molybdenum compound.

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.

13. The composition according to claim 12, wherein the basic nitrogen compound is a succinimide.

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.

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.

16. The composition according to claim 14, wherein the oil-soluble, phosphorus-containing, anti-wear compound is a zinc dialkyldithiophosphate.

17. A method for lubricating an internal combustion engine comprising supplying thereto the lubricant composition of claim 1.

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.