Cationic electrodeposition process

摘要

In a cationic electrodeposition process for coating an electric conductive substrate as a cathode with an electrodeposition process-coating composition containing a resin; an improvement characterized in that said resin is a resin having hydroxyl groups, tertiary amino groups, quaternary ammonium groups and blocked isocyanate groups which are reactive with hydroxyl group at an elevated temperature which is obtained by reacting (a) a polyisocyanate; (b) a polyhydroxyl compound; (c) a hydroxyl compound having tertiary amino group; (d) a hydroxyl compound having quaternary ammonium group; and (e) a monofunctional blocking agent. The coated layer has excellent anticorrosive characteristic, mechanical characteristics and the coating composition has excellent stability for aging.