Lubricating oil compositions containing complex metal salts of alkylphenolaldehyde condensation products

Claim 1

A LUBRICATING OIL COMPOSITION COMPRISING A MAJOR PROPORTION OF MINERAL LUBRICATING OIL AND A MINOR PROPORTION, SUFFICIENT TO IMPROVE THE DEGERGENT CHARACTER THEREOF, OF A COMPLEX METAL SALT OF AN ALKYLPHENOL-FORMALDEHYDE CONDENSATION PRODUCT PREPARED BY THE METHOD WHICH COMPRISES (1) REACTING ABOUT 1 MOLE OF A MONOALKYL-SUBSTITUTED PHENOL HAVING FROM ABOUT 8 TO ABOUT 18 CARBON ATOMS IN THE ALKYL SUBSTITUENT GROUP THEREOF, IN THE PRESENCE OF A HYDROCARBON SOLVENT, WITH (A) FROM ABOUT 0.5 TO ABOUT 1.3 MOLES OF FORMALDEHYDE, (B) FROM ABOUT 0.5 TO ABOUT 1.0 MOLE OF A CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF FORMIC ACID AND GLYCOLIC ACID AND (C) FROM ABOUT 0.85 TO ABOUT 4.0 MOLES OF A HYDROXIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, BARIUM AND STRONTIUM, THE AMOUNT OF SAID METAL HYDROXIDE BEING FROM ABOUT 1.70 TO ABOUT 4.0 MOLES IN THE CASE OF POTASSIUM AND SODIUM HYDROXIDES AND FROM ABOUT 0.85 TO ABOUT 2.0 MOLES IN THE CASE OF BARIUM AND STRONTIUM HYDROXIDES, AT A TEMPERATURE OF ABOUT 40*C. TO ABOUT 85*C., (2) HEATING THE REACTION MIXTURE FROM STEP 1 AT A TEMPERATURE OF AT LEAST ABOUT 150*C. TO SUBSTANTIALLY COMPLETELY DEHYDRATE SAID MIXTURE AND (3) FILTERING OFF INSOLUBLE MATERIAL.