Overbased Friction Modifiers and Methods of Use Thereof
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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.
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Citations
15 Claims
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1. (canceled)
- 2. A composition comprising an overbased metal salt of an N-substituted 4-carboxypyrrolidin-2-one, wherein the N-substituent comprises an alkyl group of about 8 to about 24 carbon atoms.
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3. (canceled)
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14. (canceled)
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15. (canceled)
Specification