Lubricating composition containing a salt of a carboxylic acid
AssigneeThe Lubrizol Corporation
InventorsPatrick E. Mosier, Scott Capitosti, Ewan E. Delbridge
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Abstract
The invention provides a lubricating composition containing an oil of lubricating viscosity and an amine or ammonia salt of a carboxylic acid compound where said carboxylic acid is characterized in that it is functionalized with a hydroxy-substituted aromatic moiety. The invention further relates to methods of lubricating an internal combustion engine by supplying the described lubricating composition to the internal combustion engine. The invention further relates to the use of the salt of the carboxylic acid compound as an antiwear agent or an antioxidant.
Claims10
A lubricating composition comprising an oil of lubricating viscosity and an amine or ammonia salt of a carboxylic acid wherein the carbonyl carbon of the acid is attached directly to or through a divalent hydrocarbyl linkage to an aromatic moiety wherein said aromatic moiety includes two or more hydroxy-groups, alkoxy-groups, or mixtures thereof and at least one of:
- (i) a metal dihydrocarbyl dithiophosphate that contributes at least 100 ppm of phosphorus to the overall composition;
- (ii) a dispersant viscosity modifier comprising at least one of ethylene-propylene copolymers that have been functionalized with an acylating agent such as maleic anhydride and an amine, polymethacrylates functionalized with an amine, or esterified styrene-maleic anhydride copolymers reacted with an amine;
- or
- (iii) an overbased detergent comprising at least one of phenates, sulfur containing phenates, sulfonates, salixarates, salicylates, or mixtures thereof.
Dependencies are inferred from the claim text.