Esters of mixed dicarboxylic acids

Claim 1

A LUBRICATING GREASE SUITABLE FOR USE AT SUB-ZERO TEMPERATURES, SAID GREASE CONSISTING OF A LUBRICATING OIL CONTAINING BETWEEN ABOUT 3% AND ABOUT 35% BY WEIGHT OF A THICKENING AGENT SELECTED FROM THE CLASS CONSISTING OF METAL SOAPS, SILICIA AND ALUMINA AEROGELS, ALKYL AMMONIUM BENTONITES AND METAL PHTHALOCYANINES, SAID LUBRICATING OIL COMPRISING AN ESTER HAVING A POUR POINT BETWEEN -30*F. AND -100*F., A KINEMATIC VISCOSITY BETWEEN ABOUT 3 AND ABOUT 35 CENTISTOKES AT 100*F. AND BEING OBTAINED BY ESTERIFYING AN ACID MIXTURE HAVING A SAPONIFICATION NUMBER-ACID NUMBER RATIO BETWEEN ABOUT 1.2 AND ABOUT 1.32 TO 1 WITH A COMPOUND SELECTED FROM THE CLASS CONSISTING OF THE MONOALKYL ESTERS OF GLYCOLS AND POLYGLYCOLS, SAID ACID MIXTURE BEING OBTAINED BY AIR BLOWING A REFINED PARAFFIN WAX HAVING A MELTING POINT BETWEEN ABOUT 120*F. AND ABOUT 165*F. AT A TEMPERATURE BETWEEN ABOUT 210*F. AND ABOUT 260*F. AND A PRESSURE BETWEEN ATMOSPHERIC PRESSURE AND 500 POUNDS PER SQUARE INCH UNTIL THE ACID NUMBER OF THE OXIDIZED WAX IS AT LEAST ABOUT 490 MG. KOH/G., THE RATE OF AIR BLOWING BEING INITIALLY BETWEEN ABOUT 0.75 AND ABOUT 1.25 STANDARD CUBIC FEET PER MINUTE PER 100 POUNDS OF WAX AND SAID RATE BEING INCREASED AS THE OXIDATION PROCEEDS TO BETWEEN ABOUT 1.5 AND 2.0 STANDARD CUBIC FEET PER MINUTE PER 100 POUNDS OF WAX AT 90 HOURS, SAID LAST NAMED RATE BEING MAINTAINED TO THE END OF THE PERIOD OF OXIDATION.