Lubricating oil compositions containing amidine antioxidants

• US 9,752,092 B2
• Filed: 10/30/2015
• Issued: 09/05/2017
• Est. Priority Date: 10/30/2015
• Status: Active Grant

• Current Assignee: Chevron Oronite Company LLC (Chevron Corp.)
• Original Assignee: Chevron Oronite Company LLC (Chevron Corp.)
• Inventors: Qian, Xuelei Lily
• Primary Examiner(s): MCAVOY, ELLEN M
• Application Number:
  US14/928,050
• Publication Number:
  US 20170121625A1
• Time in Patent Office: 676 Days
• Field of Search: 508268, 508284, 508563
• CPC Class Codes: C10M 133/12 having amino groups bound to a carbon atom of a six-membered aromatic ring
• CPC Class Codes: C10M 133/38 Heterocyclic nitrogen compounds
• CPC Class Codes: C10M 133/40 Six-membered ring containing nitrogen and carbon only
• CPC Class Codes: C10M 133/44 Five-membered ring containing nitrogen and carbon only
• CPC Class Codes: C10M 141/06 at least one of them being an organic nitrogen-containing compound
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• 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 2215/086 Imides
• CPC Class Codes: C10M 2215/22 Heterocyclic nitrogen compounds
• 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 2215/224 Imidazoles
• CPC Class Codes: C10M 2227/066 derived from Mo or W
• 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 2030/42 Phosphor free or low phosphor content compositions
• CPC Class Codes: C10N 2030/43 Sulfur free or low sulfur content compositions
• CPC Class Codes: C10N 2030/45 Ash-less or low ash content
• CPC Class Codes: C10N 2040/04 Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• CPC Class Codes: C10N 2040/042 : for automatic transmissions
• CPC Class Codes: C10N 2040/08 : Hydraulic fluids, e.g. brake-fluids
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines
• CPC Class Codes: C10N 2040/252 : Diesel engines

Abstract

The present invention provides a lubricating oil composition comprising:

• • (a) a major amount of a lubricating oil,
  • (a) a diarylamine antioxidant, and
  • (b) an amidine compound of Formula (I),

• • wherein R₁ is hydrogen, an alkyl or an aromatic group containing 1-30 carbon atoms; x is from 1 to 5; Y is an optional linking alkyl group; Z is carbon or nitrogen; and R₂ is hydrogen or alkyl groups containing 1-30 carbon atoms.

Also provided is a method for lubricating an engine comprising lubricating the engine with said lubricating oil composition.

Claims

1. A lubricating oil composition comprising:

(a) a major amount of a lubricating oil,

(b) a diarylamine antioxidant, and

(c) an amidine compound of Formula (I),

2. The lubricating oil composition of claim 1, wherein the diarylamine antioxidant is selected from the group comprising diphenylamine, phenyl-α

-naphthylamine, and alkylated diarylamines.

3. The lubricating oil composition of claim 2, wherein the diarylamine antioxidant is diphenylamine.

4. The lubricating oil composition of claim 1, wherein the concentration of the diarylamine antioxidant in the lubricating oil composition is at least about 0.01 wt. %.

5. The lubricating oil composition of claim 1, wherein the concentration of the diarylamine antioxidant in the lubricating oil composition is 0.01 to 10 wt. %.

6. The lubricating oil composition of claim 1, wherein the concentration of the diarylamine antioxidant in the lubricating oil composition is 0.2 to 10 wt. %.

7. The lubricating oil composition of claim 1, wherein the concentration of the diarylamine antioxidant in the lubricating oil composition is 0.1 to 5 wt. %.

8. The lubricating oil composition of claim 1, wherein the concentration of the amidine compound in the lubricating oil composition is from greater than 0.5 to 5 wt. %.

9. The lubricating oil composition of claim 1, wherein the concentration of the amidine compound in the lubricating oil composition from greater than 0.5 to 2 wt. %.

10. A lubricating oil composition in claim 1 further comprises a molybdenum-containing antioxidant.

11. A lubricating oil composition in claim 10, wherein the molybdenum-containing antioxidant is a molybdenum succinimide.

12. A method for lubricating an engine comprising lubricating the engine with a lubricating oil composition comprising:

(a) a major amount of a lubricating oil,

(b) a diarylamine antioxidant, and

(c) an amidine compound of Formula (I),

13. The method of claim 12 wherein the concentration of the diarylamine antioxidant in the lubricating oil composition is 0.01 to 10 wt. %.

14. The method of claim 12 wherein the concentration of the amidine compound in the lubricating oil composition is from greater than 0.5 to 5 wt. %.

15. The method of claim 12 wherein the lubricating oil composition further comprises a molybdenum-containing antioxidant.

16. The method of claim 15 wherein the molybdenum-containing antioxidant is a molybdenum succinimide.