Two-phase cathodic electrocoat containing epoxy resin-ATBN adducts

A two-phase cathodic electrocoat obtained by depositing on an electrically conductive substrate a mixture comprising

• A) an aqueous cationic dispersion of an amino epoxy resin obtained by reaction of an epoxy resin with a primary amino-functionalized compound selected from the group consisting of saturated amines and saturated aminoalcohols, and
• B) an aqueous cationic dispersion of an amino epoxy resin obtained by reacting a butadiene/acrylonitrile copolymer which contains primary and/or secondary amino groups with an epoxy resin having an average molecular weight of from 140 to 10,000 and containing an average from 1.5 to 3 epoxy groups per molecule, the weight ratio of the butadiene/acrylonitrile copolymer to the epoxy resin being selected so that from 1.05 to 20 moles of NH groups of the amino-containing butadiene/acrylonitrile copolymer are used per mole of epoxy group of the epoxy resin, the amino epoxy resin having a glass transition temperature of from -80 to 20.degree. C., and, optionally
• C) a cross-linking agent, a pigment paste, a solvent, a flow control agent, a defoamer and/or a curing catalyst, wherein the polymers of dispersions (A) and (B) are mutually incompatible, and, thereafter baking the deposited mixture.