# US 9,752,092 B2 · Lubricating oil compositions containing amidine antioxidants

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- Number: US 9,752,092 B2
- Document ID: US9752092B2
- Status: Granted
- Kind: B2
- Application number: 14/928,050
- Filed: 2015-10-30
- Published: 2017-05-04
- Granted: 2017-09-05
- Earliest claimed: 2015-10-30
- Assignees: Chevron Oronite Company LLC
- Applicants: Chevron Oronite Company LLC
- Inventors: Xuelei Lily Qian
- Web page: https://patentgrep.com/patent/US9752092B2

## CPC

- C10M 133/44: Five-membered ring containing nitrogen and carbon only
- C10M 133/12: having amino groups bound to a carbon atom of a six-membered aromatic ring
- C10M 133/38: Heterocyclic nitrogen compounds
- C10M 133/40: Six-membered ring containing nitrogen and carbon only
- C10M 141/06: at least one of them being an organic nitrogen-containing compound
- C10M 169/04: Mixtures of base-materials and additives
- C10M 2215/06: having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M 2215/064: Di- and triaryl amines
- C10M 2215/086: Imides [having hydrocarbon substituents containing less than thirty carbon atoms]
- C10M 2215/22: Heterocyclic nitrogen compounds
- C10M 2215/221: Six-membered rings containing nitrogen and carbon only
- C10M 2215/223: Five-membered rings containing nitrogen and carbon only
- C10M 2215/224: Imidazoles
- C10M 2227/066: derived from Mo or W
- C10N 2010/12: Groups 6 or 16
- C10N 2030/10: Inhibition of oxidation, e.g. anti-oxidants
- C10N 2030/42: {Phosphor free or low phosphor content compositions}
- C10N 2030/43: {Sulfur free or low sulfur content compositions}
- C10N 2030/45: {Ash-less or low ash content}
- C10N 2040/04: Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
- C10N 2040/042: {for automatic transmissions}
- C10N 2040/08: Hydraulic fluids, e.g. brake-fluids
- C10N 2040/25: Internal-combustion engines
- C10N 2040/252: {Diesel engines}
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## 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

### Claim 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),
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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 2)

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

### Claim 4 (depends on 1)

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. %.

### Claim 5 (depends on 1)

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. %.

### Claim 6 (depends on 1)

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. %.

### Claim 7 (depends on 1)

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. %.

### Claim 8 (depends on 1)

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. %.

### Claim 9 (depends on 1)

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. %.

### Claim 10 (depends on 1)

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

### Claim 11 (depends on 10)

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

### Claim 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),
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.

### Claim 13 (depends on 12)

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

### Claim 14 (depends on 12)

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. %.

### Claim 15 (depends on 12)

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

### Claim 16 (depends on 15)

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