Complex metal salts of phosphoric acid esters and mineral oil compositions containing the same

Claim 1

A MINERAL LUBRICATING OIL CONTAINING A MINOR PROPORTION, SUFFICIENT TO IMPROVE THE DETERGENT CHARACTER OF SAID OIL, OF A COMPLEX METAL SALT OF A PARTIAL ESTER OF PHOSPHORIC ACID HAVING A METAL CONTENT GREATER THAN THAT WHICH WOULD BE EQUIVALENT TO THE ACID-HYDROGEN CONTENT OF SAID PARTIAL ESTER, PREPARED BY THE STEPS OF (1) REACTING ONE MOL OF PHOSPHORUS PENTOXIDE WITH FROM ABOUT ONE TO ABOUT THREE MOLS OF AN ORGANIC HYDROXYAROMATIC COMPOUND THAT HAS AN ALKYL SUBSTITUENT HAVING AT LEAST 8 CARBON ATOMS IN PLACE OF A NUCLEAR HYDROGEN ATOM THEREOF AND A PRIMARY, ALIPHATIC ALCOHOL HAVING AT LEAST 8 CARBON ATOMS PER MOLECULE, TO FORM AN ACIDIC, PARTIAL ESTER OF PHOSPHORIC ACID, AND (2) REACTING SAID ACIDIC, PARTIAL ESTER OF PHOSPHORIC ACID WITH A METAL SALT REAGENT, THE METAL CONSTITUENT OF WHICH IS SELECTED FROM THE GROUP CONSISTING OF ZINC, CADMIUM, MAGNESIUM, COBALT, BARIUM, CALCIUM AND STRONTIUM, IN AN AMOUNT SUFFICIENT TO FURNISH AT LEAST ABOUT TWO EQUIVALENTS OF METAL PER EQUIVALENT OF ACID-HYDROGEN CONTENT IN SAID ACIDIC, PARTIAL ESTER OF PHOSPHORIC ACID, AND IN WHICH AT LEAST ABOUT ONE OF SAID EQUIVALENTS OF METAL IS FURNISHED BY A METAL CARBOXYLAT SELECTED FROM THE GROUP CONSISTING OF METAL ACETATES AND METAL CAPROATES.