WATER-BASED CATIONIC PAINT

PURPOSE:To provide the title paint which does not cause coloration of reddish brown to dark red even when brought into contact with iron, containing a basic nitrogen-contg. polymer (acid-neutralized product), a specified curing agent and a chelating agent. CONSTITUTION:A basic nitrogen-contg. polymer (A) composed of a basic nitrogen-contg. acrylic monomer (a) (e.g., dimethylaminoethyl methacrylate) and optionally, a copolymerizable monomer (b), or a neutralized product (A) obtd. by partially or wholly neutralizing said polymer with an acid, is blended with a curing agent (B) composed of a benzoguanamine resin and/or a melamine resin having carboxyl groups and an acid value of not lower than 10mg KOH of g of solid by neutralization titration with KOH, in a weight ratio of 60-80:40-20 to obtain a blend. The blend is blended with at least 0.1wt%, pref. 0.5-20wt% (per 100pts.wt. nonvolatile matter of the component B) chelating agent (C) (e.g., ethylenediaminetetraacetic acid). If desired, a pigment, an org. solvent, a surfactant, a leveling agent, an ultraviolet absorber, a plasticizer, etc., are added thereto.