Abstract: A cathodic sediment type of electrodeposition paint composition which consists of an aqueous medium, a resinous binder dissolved or dispersed therein and an accelerating catalyst. The resinous binder is an acid neutralized reaction mixture of a first and a second component in a weight ratio of 99 to 20 parts of the first component to 1 to 80 parts of the second component. The first component is an addition material of a polybutadiene terminating in an epoxy group and a primary or secondary amino compound. The second component is an addition material of an epoxy resin and a primary or secondary amino compound. The accelerating catalyst is selected from the group consisting of an oleosoluble organic acid salt of a transition metal, the metal in turn being selected from the group consisting of iron, vanadium and titanium.

Abstract: A paint composition for cationic electrodeposition process comprises a producing step in which a polymer of conjugated diene having carboxyl group at molecular terminal position or a copolymer of the said conjugated diene and vinyl monomer is made to react with an epoxy resin by a type of condensate of bisphenol A - epichlorohydrin and further, the resulting reaction compound is made to react with a primary amine compound or a secondary amine compound and thereby a reaction compound (component 1) is obtained and furthermore, the said reaction compound (component 1) is made to react with a partial block isocyanate compound (component 2) and this final reaction compound is used for an ingredient of the paint composition as a film forming material.