Electrodeposition process using partially esterified oil-acid adducts

Claim 1

IN A METHOD OF COATING A METAL SUBSTRATE WHICH COMPRISES PASSING AN ELECTRIC CURRENT BETWEEN AN ELECTRICALLY CONDUCTIVE METAL ANODE AND AN ELECTRICALLY CONDUCTIVE CATHODE IN CONTACT WITH AN AQUEOUS BATH COMPRISING A PARTIALLY ESTERIFIED AND PARTIALLY NEUTRALIZED PRODUCT OF A FATTY ACID ESTER AND AN ACIDIC COMPOUND, THE ADDITIONAL STEP OF ADDING TO SAID BATH A COMPOSITION COMPRISING A VEHICLE WHICH COMPRISES A REACTION PRODUCT OF AN ESTER SELECTED FROM THE CLASS CONSISTING OF DRYING OIL FATTY ACID ESTERS AND SEMI-DRYING OIL FATTY ACID ESTERS WITH AT LEAST ONE ACIDIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ANHYDRIDES OF ALPHA, BETA-ETHYLENICALLY UNSATURATED DICARBOXYLIC ACIDS, ALPHA, BETA-ETHYLENICALLY UNSATURATED DICARBOXYLIC ACIDS WHICH FROM ANHYDRIDES, SAID REACTION PRODUCT HAVING UP TO ABOUT HALF OF THE ACIDIC CARBOXYL GROUPS ESTERIFIED BY REACTION WITH A WATER-SOLUBLE MONOHYDRIC ALCOHOL AND UP TO ABOUT 20 PERCENT OF THE UNESTERIFIED ACIDIC CARBOXYL GROUPS NEUTRALIZED.