Synergistic lubricating oil composition containing a mixture of a nitro-substituted diarylamine and a diarylamine

• US 7,683,017 B2
• Filed: 06/20/2007
• Issued: 03/23/2010
• Est. Priority Date: 06/20/2007
• Status: Active Grant

• Current Assignee: Chevron Oronite Company LLC (Chevron Corp.)
• Original Assignee: Chevron Oronite Company LLC (Chevron Corp.)
• Inventors: Cherpeck, Richard E., Chan, Carrie Y.
• Primary Examiner(s): McAvoy; Ellen M
• Assistant Examiner(s): WEISS, PAMELA HL
• Application Number:
  US11/766,070
• Publication Number:
  US 20080318815A1
• Time in Patent Office: 1,007 Days
• Field of Search: 508/290, 508/244, 508/268, 508/433, 508/547, 508/549, 252/397, 252/398, 252/399, 252/400, 252/401, 252/402, 252/403
• US Class Current: 508/549
• CPC Class Codes: C10M 141/06 at least one of them being an organic nitrogen-containing compound
• CPC Class Codes: C10M 141/08 at least one of them being an organic sulfur-, selenium- or tellurium-containing compound
• CPC Class Codes: C10M 141/10 at least one of them being an organic phosphorus-containing compound
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2215/02 Amines, e.g. polyalkylene polyamines; Quaternary amines polyalkylene polyamines with eleven or more monomer units C10M2217/046
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/066 Arylene diamines
• CPC Class Codes: C10M 2215/08 Amides
• CPC Class Codes: C10M 2215/202 containing nitro groups
• CPC Class Codes: C10M 2215/221 Six-membered rings containing nitrogen and carbon only
• CPC Class Codes: C10M 2215/223 Five-membered rings containing nitrogen and carbon only
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2217/043 Mannich bases
• CPC Class Codes: C10M 2217/06 Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
• CPC Class Codes: C10M 2219/022 of hydrocarbons, e.g. olefines polyolefins C10M2221/041
• CPC Class Codes: C10M 2219/066 Thiocarbamic type compounds
• CPC Class Codes: C10M 2219/082 containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2219/087 containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
• CPC Class Codes: C10M 2219/108 Phenothiazine
• CPC Class Codes: C10M 2223/02 having no phosphorus-to-carbon bonds
• CPC Class Codes: C10M 2223/04 : Phosphate esters
• 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 2223/06 : having phosphorus-to-carbon bonds
• CPC Class Codes: C10N 2010/04 : Groups 2 or 12
• CPC Class Codes: C10N 2010/12 : Groups 6 or 16
• CPC Class Codes: C10N 2030/10 : Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2060/09 : Treatment with nitrogen containing compounds

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.

Claims

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;

2. The composition according to claim 1, wherein the ratio of component a) to component b) is from about 1.25:

1 to about 5;

1.

3. The composition according to claim 2, wherein the total weight percent of the mixture of antioxidants in the composition is less than 5 weight percent.

4. The composition according to claim 3, wherein the total weight percent of the mixture of antioxidants in the composition is less than 2 weight percent.

5. The composition according to claim 1, wherein in component a):

R₂ is hydrogen.

6. The composition according to claim 5 wherein R₁ is alkyl front 4 to 18 carbon atoms.

7. The composition according to claim 5, wherein R₁ is —

NHR or —

NRR wherein R is an independently selected alkyl group from 3 to 12 carbon atoms.

8. The composition according to claim 1, wherein in component b):

R₅ is selected from alkyl from 3 to 24 carbon atoms or —

NHR₆, —

NR₆R₇ where R₆ and R₇ are independently selected alkyl from 1 to 18 carbon atoms.

9. The composition according to claim 8, wherein in component b):

R₅ is selected from alkyl from 4 to 18 carbon atoms.

10. The composition according to claim 1, wherein component b) is selected from the group consisting of monoalkylated diphenylamine, dialkylated diphenylamine, trialkylated diphenylamine, and mixtures thereof.

11. The composition according to claim 10, wherein component b) is selected from the group consisting of butyldiphenylamine, di-butyldiphenylamine, octytdiphenylamine, di-octyldiphenylamine, nonyldiphenylamine, di-nonyldiphsnylamine, t-butyl-t-octyldiphenylamine, and mixtures thereof.

12. The composition according, claim 1, wherein in component b) R₅ is selected from —

NHR₆, —

NR₆R₇ where R₆ and R₇ are independently selected alkyl from 1 to 18 carbon atoms.

13. The composition according to claim 12, wherein in component b) R₆ and R₇ are independently selected alkyl from 6 to 12 carbon atoms.

14. The composition according to claim 1, wherein in component b) R₅ is selected from —

NHR₆, —

NR₆R₇ where R₆ and R₇ are independently selected alkyl from 1 to 18 carbon atoms, or when R₄ is positioned adjacent to R₅ then R₆ together with R₄ can form a five- or six-membered heterocyclic ring.

15. The composition according to claim 14, wherein R₄ is positioned adjacent to R₅ and R₆ together with R₄ form a five- or six-membered heterocyclic ring.

16. The composition according to claim 15, wherein R₄ is positioned adjacent to R₅ and R₆ together with R₄ form six-membered heterocyclic ring.

17. The composition according to claim 1, further comprising component c) an oil soluble molybdenum compound.

18. The composition according to claim 17, wherein component c) 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.

19. The composition according to claim 10, wherein the basic nitrogen compound is a succinimide.

20. The composition according to claim 1, 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.

21. The composition according to claim 20, wherein said phosphorus esters are selected from the group consisting of phosphates, phosphonates, phosphinates, phosphine oxides, phosphites, phosphorites, phosphinites, and phosphines.

22. The composition according to claim 20, wherein the oil-soluble, phosphorus-containing, anti-wear compound is a metal dithiophosphate.

23. The composition according to claim 22, wherein the metal dithiophosphate is a zinc dialkyldithiophosphate.

24. The composition according to claim 1, further comprising supplemental antioxidant selected from the group consisting of hindered phenols, hindered bisphenols, sulfurized phenols, sulfurized olefins, alkyl sulfides, polysulfides, dialkyl dithiocarbamates and phenothiazines.