Abstract: The aqueous coating composition contains film-forming constituents dispersed in an aqueous medium;The film-forming constituents areA. the reaction product of1. an epoxy ester resin such as an epoxy hydroxy polyether resin and drying oil fatty acids, and2. maleinized drying oil, andB. a water dispersible cross-linking agent such as benzoguanamine formaldehyde;The composition is neutralized to a pH of 7.2-10 with a basic compound such as potassium hydroxide or an amine;The composition is applied by convention spray techniques or by electrodeposition and is useful as a primer or as a primer surfacer for automobile and truck bodies and small metal parts used in the manufacture of automobiles and trucks. Finishes of acrylic lacquers, acrylic enamels, acrylic dispersion lacquers or enamels or acrylic powders can be applied over the primed substrates.

Abstract: An improved electrocoating process in which a metal substrate is first coated with an anionic layer, for example, anions of an acidic material such as phosphoric acid or chromic acid are used, the anions combine with the metal to form a corrosion retardant layer and then the substrate is electrocoated with a cationic film-forming polymer and dried to form a continuous film.An aqueous electrocoating composition of an acrylic cationic film-forming polymer reacted with an acid material also is a part of this invention.

Abstract: The aqueous coating composition contains filmforming constituents dispersed in an aqueous medium;The film-forming constituents areA. the reaction product of1. an epoxy ester resin such as an epoxy hydroxy poly-ether resin and drying oil fatty acids, and2. maleinized drying oil, andB. a water dispersible cross-linking agent such as benzoguanamine formaldehyde;The composition is neutralized to a pH of 7.2-10 with a basic compound such as potassium hydroxide or an amine;The composition is applied by conventional spray techniques or by electrodeposition and is useful as a primer or as a primer surfacer for automobile and truck bodies and small metal parts used in the manufacture of automobiles and trucks. Finishes of acrylic lacquers, acrylic enamels, acrylic dispersion lacquers or enamels or acrylic powders can be applied over the primed substrates.