Lubricating composition containing an antiwear agent

Patent metadata

Field	Value
Publication number	US-9976103-B2
Application number	US-201013515341-A
Country	US
Kind code	B2
Filing date	Dec 10, 2010
Priority date	Dec 14, 2009
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

The invention provides a lubricating composition containing an oil of lubricating viscosity and a nitrile compound. The invention further relates to a method of the lubricating an internal combustion engine with the lubricating composition.

First claim

We claim:

1. A method of reducing lead corrosion of lead or lead alloy components in an internal combustion engine, said method comprising supplying to the internal combustion engine a lubricating composition comprising 46 to 97.9 wt %, of an oil of lubricating viscosity, from 0.1 to 0.5 wt % of a nitrile compound of formula (2):

wherein, T is —C≡N; R 5 is hydrogen; V is a hydrocarbyl group containing 4 to 20 carbon atoms; Z is —S—; A is hydrogen; and E is a hydrocarbyl group containing 4 to 20 carbon atoms, and from 0.5 wt % to 1.5 wt % of zinc dialkyldithiophosphate,
wherein the lubricating composition is characterised as having (i) a sulphur content of 0.5 wt % or less, (ii) a phosphorus content of 0.1 wt % or less, and (iii) a sulphated ash content of 1.5 wt % or less, and;
thereby reducing lead corrosion in said lead or lead alloy components.

2. The method of claim 1 , wherein E is a C 6-12 linear alkyl group.

3. The method of claim 1 wherein the lubricating composition further comprises at least one of an antiwear agent, a dispersant viscosity modifier, a friction modifier, a viscosity modifier, an antioxidant, an overbased detergent, or mixtures thereof.

4. The method of claim 1 wherein the lubricating composition further comprises a dispersant viscosity modifier.

5. The method of claim 1 wherein said lead or lead alloy components are cam followers and bearings.

6. The method of claim 1 wherein said lubricating composition comprises 1.09 wt % zinc dialkyldithiophosphate and 0.1 wt % nitrile compound, based on a total weight of said lubricating composition.

7. The method of claim 1 wherein said nitrile compound comprises the reaction product of a malononitrile and a thiol.

8. The method of claim 7 wherein said nitrile compound comprises the reaction product of 2-ethylhexanylidene malononitrile and n-dodecylthiol.

Assignees

• Yodice Richard
• Crawley Seth L
• Kocsis Jody A
• Lubrizol Corp

Inventors

• Yodice Richard
• Crawley Seth L
• Kocsis Jody A

Classifications

• C10M159/12

  Reaction products · CPC title

• C10M2215/086

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

• C10M2207/289

  containing free hydroxy groups · CPC title

• C10M2207/26

  Overbased carboxylic acid salts · CPC title

• C10M2223/045

  Metal containing thio derivatives · CPC title