Process for electrodeposition of resist formulations which contain metal salts of β-diketones

Claim 1

A process for electrodepositing a coating on an electroconductive article which comprises the following steps: immersing the electroconductive article in a photoimageable electrodeposition coating composition comprising an aqueous dispersion of (a) a water-soluble or water-dispersible polymer having an acid value of 20 to 300, and a number average molecular weight of not less than 300; with the proviso that when the polymer is unsaturated it has an unsaturation equivalent of 150 to 3000, and when the polymer is saturated, it is used in combination with an ethylenically unsaturated compound; (b) an initiator or initiating system, and (c) a metal salt of a β diketone having the following general formula: ##STR2## wherein M is a metal cation selected from the group consisting of Al +3 , Ca +2 , Ni +2 , Cr +3 , Mg +2 and Fe +3 ; R and R 1 independently are alkyl of 1 to 18 carbon atoms or aryl of 6 to 30 carbon atoms; n is the valency of the metal; and forming an electrodeposition coated film on the surface of the electroconductive article by supplying electric current to the article as the anode.