Lubricants containing quaternary ammonium compounds

Patent metadata

Field	Value
Publication number	US-10358616-B2
Application number	US-201615563758-A
Country	US
Kind code	B2
Filing date	Apr 5, 2016
Priority date	Apr 9, 2015
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

A driveline device is lubricated with a composition of an oil of lubricating viscosity and an oil-soluble quaternary ammonium compound, such as a succinimide or succinamide material or dispersant further containing a quaternary nitrogen atom, and a thiadiazole compound.

First claim

What is claimed is:

1. A method for lubricating a driveline device, comprising supplying thereto a composition comprising:
(a) an oil of lubricating viscosity;
(b) 2 to 3.5 wt % of an oil-soluble quaternary ammonium compound comprising a hydrocarbyl-substituted imide or amide, further containing a quaternary nitrogen atom and a hydrocarbylsulfate anion, wherein the quaternary nitrogen is bonded to four carbon atoms by four single bonds;
(c) 0.1 to 1 wt % of a dialkylmercaptothiadiazole compound;
(d) 0.1 to 1 wt % of a dialkyl phosphite compound where each alkyl group independently contains 1 to 10 carbon atoms; and
(e) 0.1 to 1.5 wt % of a condensate of a C 8 to C 24 fatty acid and a polyalkylene polyamine.

2. The method of claim 1 wherein the hydrocarbyl-substituted imide or amide is a succinimide or succinamide.

3. The method of claim 1 wherein the hydrocarbyl-substituent of the imide or amide contains about 12 to about 500 carbon atoms.

4. The method of claim 1 wherein the hydrocarbylsulfate anion includes an alkyl group containing 1 to about 30 carbon atoms.

5. The method of claim 1 wherein the hydrocarbylsulfate anion is a methylsulfate anion.

6. The method of claim 1 wherein the quaternary ammonium compound comprises the reaction product of a hydrocarbyl-substituted succinic acid or anhydride and an N,N-dialkylpropylenediamine, which reaction product is quaternized.

7. The method of claim 1 wherein the quaternary ammonium compound comprises a cation represented by the structure

wherein R 1 represents a hydrocarbyl group of at least about 16 or at least about 24 carbon atoms, provided that R 1 may be attached to the cyclic imide structure by any of a variety of linkages including cyclic linkages and further provided that R 1 may be attached to multiple cyclic imide structures;
where in R 2 is an alkyl group, a hydroxyalkyl group, or an arylalkyl group; R 4 is an alkyl group, and R 5 is methyl or ethyl.

8. The method of claim 1 wherein the quaternary ammonium compound comprises a material represented by the structure

or isomers thereof (or a non-cyclic amide structure corresponding thereto), wherein R 1 represents a hydrocarbyl group of at least about 16 or at least about 24 carbon atoms, provided that R 1 may be attached to the cyclic imide structure by any of a variety of linkages including cyclic linkages and further provided that R 1 may be attached to multiple cyclic imide structures;
wherein R 2 is an alkyl group, a hydroxyalkyl group, or an arylalkyl group; and wherein R 3 is methyl or ethyl.

9. The method of claim 1 wherein the quaternary ammonium compound comprises a material represented by the structure

wherein PIB represents a polyisobutene group of about 24 to about 400 carbon atoms.

10. The method of claim 1 wherein the driveline device comprises a wet clutch.

11. The method of claim 1 wherein the driveline device is a transmission.

12. The method of claim 1 wherein the driveline device is a dual clutch transmission.

Assignees

• Lubrizol Corp

Inventors

• Gahagan Michael P
• Miatt Peter

Classifications

• C10M2219/106

  Thiadiazoles · CPC title

• C10M2215/28

  Amides; Imides · CPC title

• C10M2215/086

  Imides [having hydrocarbon substituents containing less than thirty carbon atoms] · CPC title

• C10M2215/08

  Amides [having hydrocarbon substituents containing less than thirty carbon atoms] · CPC title

• C10M169/048 Primary

  the additives being a mixture of compounds of unknown or incompletely defined constitution, non-macromolecular and macromolecular compounds · CPC title