Abstract: The present invention provides a cationically electrodepositable coating composition comprising: (A) a water-soluble or water-dispersible resin obtained by reacting a hydroxyl group of a bisphenol A type epoxy resin with a cyclic ester compound, (B) a vinyl resin having a solubility parameter value of less than 9.6, (C) polyalkylene glycol having a solubility parameter value of less than 9.6, and (D) a pigment component having an average particle diameter of 0.5 &mgr;m or less.

Abstract: The present invention provides a cationic electrodepositable coating composition comprising:?I! a polyurethane-modified epoxy resin-amine adduct obtained by a reaction of:(A) a polyurethane compound having one terminal isocyanate group in the molecule, obtained by a reaction of (a) a polyhydroxy compound having a number-average molecular weight of 50-8,000, (b) a polyisocyanate compound, and (c) a compound having one active hydrogen atom in the molecule,(B) a bisphenol type epoxy resin having at least two epoxy groups in the molecule, and(C) an active-hydrogen-containing amine compound, and ?II! a nonionic film-forming resin.This composition can form a coating film having excellent weathering resistance and corrosion resistance and, when used in combination with an aqueous base coating and a powder coating (a top coat), can provide a coating system which is simple to apply, which can give a coating film very superior in appearance, corrosion resistance, weathering resistance, chipping resistance, etc.

Abstract: This invention provides a cationic electrodepositable coating composition comprising:(A) 30 to 1% by weight of a high-molecular-weight polyurethane resin prepared by reacting (a) an organic polyisocyanate, (b) a high-molecular-weight polyol, and (c) a diol having at least one tertiary amino group, the high-molecular-weight polyurethane resin (A) having a SP value of 9.5 to 12.0 and a number average molecular weight of at least 15,000; and(B) 70 to 99% by weight of an epoxy-type cationic electrodepositable resin.

Abstract: A method for forming a multilayer paint film comprising the steps of forming an uncured film on a substrate with a cationically depositable paint on a substrate, further coating an aqueous paint on the uncured film of the electrodeposited film in a wet-on-wet manner, and then curing with heating the both films,wherein (i) the electrodeposited film of the cationically electrodepositable paint has a film weight reduction after curing with heating of 10% by weight or less; andwherein (ii) the aqueous paint is composed mainly of(a) a polyester resin optionally modified with a urethane and having an acid value within the range of 10 to 100 and a hydroxyl value within the range of 20 to 300; and(b) a water-soluble or -dispersible amino resin.

Abstract: A method for forming a multilayer paint film comprising the steps of forming an uncured film on a substrate with a cationically depositable paint on a substrate, further coating an aqueous paint on the uncured film of the electrodeposited film in a wet-on-wet manner, and then curing with heating the both films,wherein (i) the electrodeposited film of the cationically electrodepositable paint has a film weight reduction after curing with heating of 10% by weight or less; andwherein (ii) the aqueous paint is composed mainly of(a) a polyester resin optionally modified with a urethane and having an acid value within the range of 10 to 100 and a hydroxyl value within the range of 20 to 300; and(b) a water-soluble or -dispersible amino resin.