Antiwear composition and method of lubricating driveline device

Patent metadata

Field	Value
Publication number	US-9976104-B2
Application number	US-201615390758-A
Country	US
Kind code	B2
Filing date	Dec 27, 2016
Priority date	Aug 18, 2009
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

The present invention relates to an antiwear agent and lubricating compositions thereof. The invention further provides for a method of lubricating a driveline device application by employing a lubricating composition containing the antiwear agent.

First claim

What is claimed is:

1. A method for lubricating a driveline device comprising supplying to the driveline device a lubricating composition comprising an oil of lubricating viscosity and an antiwear package wherein the antiwear package comprises
(a) 0.05 wt % to 0.5 wt % of a derivative of a hydroxycarboxylic acid, wherein the derivative of a hydroxycarboxylic acid is represented by the formula:

wherein
n=2, m=1, or
n and m both equal 2, or
n=3, m=1;
X is an aliphatic or alicyclic group, said group containing up to 6 carbon atoms and having n+m available points of attachment;
each Y is —O—; and
each R is independently hydrogen or a hydrocarbyl group, provided that at least one R group is a hydrocarbyl group; each R 2 is independently hydrogen, a hydrocarbyl group, further provided that at least one —OR 2 group is located on a carbon atom within X that is α or β to at least one of the —C(O)—Y—R groups, and
(b) 0.1 wt % to 0.5 wt % of a phosphorus compound, wherein the phosphorus compound is an amine salt of a phosphate hydrocarbon ester represented by the formula:

wherein
R 3 and R 4 are independently hydrogen or hydrocarbon containing 4 to 40 carbon atoms, with the proviso that at least one is a hydrocarbon group; and
R 5 , R 6 , R 7 and R 8 independently hydrogen or a hydrocarbyl group, with the proviso that at least one is a hydrocarbyl group.

2. The method of claim 1 , wherein the hydroxy-carboxylic acid is tartaric acid or citric acid.

3. The method of claim 1 , wherein the hydroxy-carboxylic acid is present at 0.1 wt % to 0.2 wt % of the lubricating composition.

4. The method of claim 1 , wherein the phosphorus compound is present at 0.2 wt % to 0.4 wt % of the lubricating composition.

5. The method of claim 1 further comprising an organo-sulphide, wherein the organo-sulphide comprises at least one of a polysulphide, a thiadiazole compound, or mixtures thereof.

6. The method of claim 1 further comprising a borated polyisobutylene succinimide, or a dimercaptothiadiazole derivative of a polyisobutylene succinimide.

Assignees

• Lubrizol Corp

Inventors

• Najman Morey N
• Baker Mark R
• Marsic Vera M

Classifications

• C10M2219/106

  Thiadiazoles · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10M2223/047

  Thioderivatives not containing metallic elements · CPC title

• C10M161/00

  Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential · CPC title

• C10M2215/28

  Amides; Imides · CPC title