Extreme pressure lubricating oils

Claim 1

AN EXTREME PRESSURE LUBRICATING OIL CONSISTING OF AN ESTER LUBRICATING OIL, WHICH ESTER LUBRICATING OIL IS SELECTED FROM THE CLASS CONSISTING OF MONOHYDROXY ALIPHATIC ALCOHOL DIESTERS OF DICARBOXYLIC ACIDS, GLYCOL MONOALKYL ETHER ESTERS OF DICARBOXYLIC ACIDS, AND POLYGLYCOL MONOALKYL ETHER ESTERS OF DICARBOXYLIC ACIDS, CONTAINING BETWEEN ABOUT 2% AND ABOUT 15% BY WEIGHT OF A COMPLETELY ESTERIFIED POLYMERIZED GLYCOL ESTER OF A MIXTURE OF DICARBOXYLIC ACIDS OBTAINED BY OXIDIZING REFINED PARAFFIN WAX WHICH IS RELATIVELY OIL-FREE AND FREE FROM ASPHALTIC AND RESINOUS MATERIALS, AND WHICH HAS A MELTING POINT BETWEEN ABOUT 120*F. AND ABOUT 165*F. WITH A GAS CONTAINING FREE OXYGEN IN THE LIQUID PHASE AT TEMPERATURES BETWEEN ABOUT 210*F. AND ABOUT 260*F. UNTIL THE ACID NUMBER OF THE PRODUCT IS BETWEEN ABOUT 460 AND ABOUT 600MG. KOH/G. AND SEPARATING FROM THE OXIDIZED PARAFFIN WAX A FRACTION COMPRISING DICARBOXYLIC ACIDS, SAID GLYCOL BEING A GLYCOL SELECTED FROM THE CLASS CONSISTING OF GLYCOLS CONTAINING AT LEAST 4 CARBON ATOMS PER MOLECULE AND POLYGLYCOLS CONTAINING AT LEAST 3 CARBON ATOMS PER GLYCOL UNIT.