Lubricant grease compostion containing surface esterified organic siliceous organophilic solid thickener

Claim 1

A LUBRICANT GREASE COMPRISING A MAJOR PROPORTION OF A MINERAL LUBRICATING OIL, FROM ABOUT 5% TO ABOUT 20%, BY WEIGHT, OF AN ORGANOPHILIC SOLID THICKENER CONSISTING ESSENTIALLY OF SUBSTRATE PARTICLES OF INORGANIC SILICEOUS MATERIALS INA SUPERCOLLOIDAL STATE OF SUBDIVISION HAVING CHEMICALLY BOUND THERETO -OR GROUPS, WHEREIN R IS A HYDROCARBON RADICAL HAVING 2 TO 18 CARBON ATOMS IN WHICH THE CARBON ATOM ATTACHED TO THE OXYGEN IS ALSO ATTACHED TO AT LEAST ONE HYDROGEN ATOM, THE SUBSTRATE PARTICLES HAVING A SPECIFIC SURFACE AREA OF FROM ABOUT 25 TO 900M.2/G. AND HAVING A SUFFICIENT NUMBER OF CHEMICALLY BOUND -OR GROUPS PER UNIT OF SUBSTRATE SURFACE AREA TO CAUSE THEM TO BE PREFERENTIALLY WETTED BY BUTANOL IN A BUTANOI-WATER MIXTURE, FROM ABOUT 0.2% TO ABOUT 5% BY WEIGHT, OF A RUST PREVENTIVE COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN ALKENYL SUCCINIC ANHYDRIDE, AND ALKENYL SUCCINIC ACID, AN ALKYL SUCCINIC ANHYDRIDE AND AN ALKYL SUCCINIC ACID WHEREIN THE ALKENYL AND ALKYL RADICALS CONTAIN FROM ABOUT 8 TO ABOUT 12 CARBON ATOMS, FROM ABOUT 0.05% TO ABOUT 1% BY WEIGHT OF PENTAERYTHRITOL MONO-OLEATE AND FROM 0.5% TO 1% BY WEIGHT OF A DIALKYL PHOSPHATE IN WHICH THE ALKYL GROUP CONTAINS FROM ABOUT 6 TO 18 CARBON ATOMS.