Patent ID: 7691795

Claim:
A grease composition comprising the reaction product of: (a) about 0.5 to about 20 weight percent of a stable dispersion of a metal hydroxide with a number average particle size in the range about 20 nanometres to about 2 micrometres, wherein the metal of the metal hydroxide is present in the range about 2 to about 16 weight percent of the dispersion; (b) a surfactant with a HLB of less than about 10, wherein the surfactant comprises a derivative of polyisobutylene substituted with succinic anhydride; (c) about 0.1 to about 30 weight percent of a carboxylic acid containing about 2 to about 30 carbon atoms, wherein the carboxylic acid is selected from a monocarboxylic acid, dicarboxylic acid and mixtures thereof, optionally the carboxylic acid is further substituted with groups selected from a hydroxyl group, an ester formed by the reaction of said carboxylic acid with an alcohol of 1 to about 5 carbon atoms; and mixtures thereof; and (d) about 50 to about 96.5 weight percent of an oil of lubricating viscosity.