LUBRICATING COMPOSITION WITH ALKYLATED NAPHTHYLAMINE

• US 20190316056A1
• Filed: 12/13/2017
• Published: 10/17/2019
• Est. Priority Date: 12/27/2016
• Status: Active Grant

• Current Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Original Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Inventors: HANTHORN, Jason J., ZHANG, Yanshi
• Granted Patent: US 11,162,048 B2
• Time in Patent Office: Days
• 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 2203/1025 used as base material
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/289 containing free hydroxy groups
• CPC Class Codes: C10M 2215/06 having amino groups bound to carbon atoms of six-membered aromatic rings
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/065 Phenyl-Naphthyl amines
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/022 of hydrocarbons, e.g. olefines polyolefins C10M2221/041
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2030/04 Detergent property or dispersant property
• CPC Class Codes: C10N 2030/10 Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/36 Seal compatibility, e.g. with rubber
• CPC Class Codes: C10N 2030/42 Phosphor free or low phosphor content compositions
• CPC Class Codes: C10N 2030/52 Base number [TBN]
• CPC Class Codes: C10N 2040/25 Internal-combustion engines

Abstract

A lubricating composition includes an oil of lubricating viscosity, an N-alkyl naphthylamine, and at least one ashless antioxidant selected from a diarylamine antioxidant, a phenolic antioxidant, and mixtures thereof. The lubricating composition has a phosphorus content of less than 0.15 weight percent. The combination of the N-alkyl naphthylamine and ashless antioxidant provides a beneficial effect on the basicity of the composition without negatively impacting seals performance.

Claims

1. A lubricating composition comprising:

an oil of lubricating viscosity;

an N-alkyl naphthylamine; and

at least one ashless antioxidant selected from a diarylamine antioxidant, a phenolic antioxidant, and mixtures thereof,

wherein the lubricating composition has a phosphorus content of less than 0.15 weight percent.

2. The lubricating composition of claim 1, wherein the composition further comprises an alkaline earth metal overbased detergent in an amount to deliver a total base number (TBN), as measured by ASTM D2896, of at least 2 mg KOH/g to the composition.

3. The lubricating composition of claim 1, wherein the N-alkyl group is alicyclic, cyclic, or acyclic.

4. The lubricating composition of claim 1, where in the N-alkyl naphthylamine is present in an amount of at least 0.15 weight percent of the lubricating composition.

5. The lubricating composition of claim 1, where in the N-alkyl naphthylamine is present in an amount of no more than 2.5 weight percent of the lubricating composition.

6. The lubricating composition of claim 1, wherein the N-alkyl naphthylamine is represented by the formula:

7. The lubricating composition of claim 6, wherein at least one of R¹ and R² is alkyl group of 1 to 24 carbon atoms.

8. The lubricating composition of claim 6, wherein at least one of R¹ and R² is alkyl group of at least 3 carbon atoms.

9. The lubricating composition of claim 6, wherein the N-alkyl naphthylamine is represented by the formula:

10. The lubricating composition of claim 6, wherein the N-alkyl naphthylamine is represented by the formula:

11. The lubricating composition of claim 1, wherein the at least one ashless antioxidant is present is present in a total amount of at least 0.15 weight percent of the composition.

12. The lubricating composition of claim 1, wherein the at least one ashless antioxidant is present is present in a total amount of no more than 5 weight percent of the composition.

13. The lubricating composition of claim 1, wherein a ratio of the ashless antioxidant to the N-alkyl naphthylamine compound present in the lubricating composition is at least 10:

90.

14. The lubricating composition of claim 1, wherein the ashless antioxidant comprises a diarylamine antioxidant.

15. The lubricating composition of claim 14, wherein the diarylamine antioxidant is selected from phenylnaphthylamines of the general formula:

16. The lubricating composition of claim 1, wherein the ashless antioxidant comprises a phenolic antioxidant.

17. The lubricating composition of claim 16, wherein the phenolic antioxidant is selected from the group consisting of C₇-C₉ branched alkyl esters of 3,5-bis(1,1-dimethyl-ethyl)-4-hydroxy-benzenepropanoic acid, 2-tert-butylphenol, 2-tert-butyl-4-methylphenol, 2-tert-butyl-5-methylphenol, 2,4-di-tert-butylphenol, 2,4-dimethyl-6-tert-butylphenol, 2-tert-butyl-4-methoxyphenol, 3-tert-butyl-4-methoxyphenol, 2,5-di-tert-butylhydroquinone, 2,6-di-tert-butyl-4-alkylphenols, 2,6-di-tert-butyl-4-alkoxyphenols, 3,5-di-tert-butyl-4-hydroxybenzylmercaptooctylacetate, alkyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionates, 2,6-di-tert-butyl-α

-dimethylamino-p-cresol, 2,2′

-methylene-bis(4-alkyl-6-tert-butylphenol), bisphenols, polyphenols, p-t-butylphenol-formaldehyde condensates and p-t-butylphenol-acetaldehyde condensates.

18. The lubricating composition of claim 1, further comprising an antiwear agent.

20. The lubricating composition of claim 1, wherein the oil of lubricating viscosity is at least 40 weight percent of the lubricating composition.

22. A method of lubricating a mechanical device comprising supplying the lubricating composition of claim 1 to the device.

19. (canceled)

21. (canceled)

23. (canceled)

24. A method for improving the retention of total base number in a crankcase lubricating composition comprising an oil of lubricating viscosity at least one ashless antioxidant selected from a diarylamine antioxidant, a phenolic antioxidant, and mixtures thereof, the method comprising:

incorporating an N-alkyl naphthylamine in the lubricating composition, and wherein the lubricating composition has a phosphorus content of less than 0.15 weight percent.