Metal hydroxide desiccated emulsions used to prepare grease
AssigneeThe Lubrizol Corporation
InventorsStephen J. Nolan, Carl F. Kernizan, Paul S. Greenfield, Claire L. Hollingshurst
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Abstract
The invention provides a grease composition comprising a stable dispersion of a metal hydroxide with a number average particle size in the range 20 nanometres to 2 micrometres, a surfactant with a HLB of less than 10, a mono- or poly-carboxylic acid, and an oil of lubricating viscosity. The method of preparing a grease composition is also disclosed with benefits including a reduction in reaction time, amount of foam produced and environmental hazards.
Claims19
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.
A process of producing a grease composition comprising mixing in any order:
- (a) a stable dispersion of metal hydroxide present in the range about 0.5 to about 20 weight percent prepared by removing the solvent from an emulsion of metal hydroxide and solvent in oil;
- (b) a carboxylic acid containing about 2 to about 30 carbon atoms, wherein the wherein the carboxylic acid contains 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 present in the range about 0.1 to about 30 weight percent,
- (c) and an oil of lubricating viscosity present in the range about 50 to about 96.5 weight percent to obtain a mixture, said mixture is further treated with a saponification stage;
- and
- (d) optionally a finishing amount of oil of lubricating viscosity is added to impart the desired viscosity.
A process to prepare a grease thickener 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 contains 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) a solvent.
Dependencies are inferred from the claim text.