Coating method of electrically conductive substrate, aqueous coating composition, preparation method of additive containing urethane group and additive containing urethane group

摘要

The invention relates to a cathodic electrophoretic enamelling process characterized in that the electrophoretic enamel contains an adduct containing urethane groups. The adduct is obtained by reacting a polyester or polyether polyol, a polyisocyanate and a compound containing a hydroxyl group and at least one ketimine group in the molecule.