Hybrid greases made with anhydrous metal soaps and over-based metal detergents and methods of making
AssigneeThe Lubrizol Corporation
InventorsDevon K. McCune, Robert D. Dura, Gareth Fish, Jennifer E. Clark
Life of this patent
Estimating the term…
Abstract
Greases that are suitable for use in high temperature applications and are cost-effective alternatives to lithium greases. The greases are prepared from an oil of lubricating viscosity; 1.0 to 22.5 wt % of an overbased metal detergent; 5.0 to 18.5 wt % of a metal carboxylate soap component that is the reaction product of a metal hydroxide and/or metal carbonate with a fatty acid; 0.2 to 8.0 wt % of an oxygenate promoter (for example alcohols and/or organic acids); and 1 to 15 wt % of water. The greases have dropping points of at least 220° C., as measured using ASTM D2265.
Claims21
A grease prepared from:
- I. an oil of lubricating viscosity;
- II. 1.0 to 22.5 wt % of an overbased metal detergent solubilized in a liquid diluent;
- III. 5.0 to 18.5 wt % of a metal carboxylate soap component that is the reaction product of 0.5 to 2.1 wt % of an alkaline earth metal hydroxide with 5 to 16 wt % of a fatty acid, and wherein the alkaline earth metal hydroxide is calcium hydroxide, magnesium hydroxide, barium hydroxide, or mixtures thereof and wherein the fatty acid comprises at least one of oleic acid, stearic acid, ricinoleic acid, 12-hydroxystearic acid, or combinations thereof;
- IV. 0.2 to 8.0 wt % of an oxygenate promoter;
- and
- V. 1 to 15 wt % of water.
A method of making a hybrid grease comprising the steps of:
- I. admixing (i) an oil of lubricating viscosity;
- (ii) 0.5 to 2.1 wt % of an alkaline earth metal hydroxide, wherein the alkaline earth metal hydroxide is calcium hydroxide, magnesium hydroxide, barium hydroxide, or mixtures thereof;
- and (iii) 5 to 16 wt % of a fatty acid, wherein the fatty acid comprises at least one of oleic acid, stearic acid, ricinoleic acid, 12-hydroxystearic acid, or combinations thereof;
- and (iv) 1 to 15 wt % of water, to form an anhydrous grease;
- II. admixing to the anhydrous grease (i) 1 to 22.5 wt % of an overbased metal detergent solubilized in a liquid diluent;
- (ii) 0.2 to 8.0 wt % of an oxygenate promoter;
- and (iii) 1 to 15 wt % of water, to form the hybrid grease.
Dependencies are inferred from the claim text.