Overbased friction modifiers and methods of use thereof

Patent metadata

Field	Value
Publication number	US-9512379-B2
Application number	US-201214233397-A
Country	US
Kind code	B2
Filing date	Jul 19, 2012
Priority date	Jul 21, 2011
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

The present invention provides a multipurpose overbased metal salt of the reaction product of a hydrocarbyl substituted amine with an itaconate, such as an N-substituted 4-carboxypyrrolidin-2-one, and methods of employing the same in lubricating compositions. Overbasing the N-substituted 4-carboxypyrrolidin-2-one can provide improved friction modifying performance to the compound as well as impart multi-functionality to the compound, i.e., the compound may function as a friction modifier as well as, for example, a detergent, anti-wear or extreme pressure agent and dispersant in lubricating compositions. The lubricating compositions containing the overbased N-substituted 4-carboxypyrrolidin-2-one are preferably intended to be employed in a method for lubricating a mechanical device, such as an automatic or manual transmission. However, it is envisioned that the compound can be employed in engine oil lubricants and any other type of functional fluid.

First claim

What is claimed is:

1. A composition comprising an overbased metal salt of an N-substituted 4-carboxypyrrolidin-2-one, wherein the N-substituent comprises a hydrocarbyl group of about 8 to about 24 carbon atoms.

2. The composition of claim 1 wherein the N-substituent comprises a group containing at least one nitrogen atom.

3. The composition of claim 1 wherein the N-substituent comprises a group having one or more amino groups, wherein at least one amino group of said substituent group is further substituted by at least one alkyl group of about 8 to about 20 carbon atoms.

4. The composition of claim 3 wherein at least one amino group in said N-substituent is reacted with dimercaptothiadiazole or a derivative of a dimercaptothiadiazole.

5. The composition of claim 1 wherein said salt has a TBN of about 10 to about 500 mg KOH/g on an oil free basis as measured by ASTM D2896.

6. The composition of claim 1 wherein the metal comprises calcium or magnesium.

7. The composition of claim 1 wherein said salt is carbonated.

8. A lubricant composition comprising an oil of lubricating viscosity and the composition of claim 1 .

9. A method of lubricating a mechanical device by supplying thereto the lubricant of claim 8 .

10. The method of claim 9 wherein the mechanical device comprises an automatic transmission or manual transmission.

11. The method of claim 9 wherein the mechanical device comprises an engine.

Assignees

• Seddon Elisa J
• Saccomando Daniel J
• Vickerman Richard J
• Brown Jason R
• Fahmy Mohamed G
• Lubrizol Corp

Inventors

• Seddon Elisa J
• Saccomando Daniel J
• Vickerman Richard J
• Brown Jason R
• Fahmy Mohamed G

Classifications

• C10N2040/08

  Hydraulic fluids, e.g. brake-fluids · CPC title

• C10N2030/06

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

• C10N2040/25

  Internal-combustion engines · CPC title

• C10N2030/04

  Detergent property or dispersant property · CPC title

• C10N2010/04

  Groups 2 or 12 · CPC title