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.

Abstract: An aqueous resin dispersion containing as an aqueous resin component a polyamide-modified epoxy-polyamine resin comprising a reaction product of a phenolic hydroxyl group-terminated polyamide compound obtained by the reaction of a polyamine compound containing at least two primary and/or secondary amino groups in a molecule and having a number average molecular weight of 40 to 8,000, a polycarboxylic acid having a number average molecular weight of 100 to 8,000 and a compound containing at least one phenolic hydroxyl group and one carboxyl group in a molecule, a bisphenol compound and a bisphenol diglycidyl ether compound, and an active hydrogen-containing amine compound. Said aqueous resin dispersion is excellent in corrosion resistance and especially suited for use in cathodic electrodeposition coating.

Abstract: An aqueous resin dispersion containing as an aqueous resin component a polyurethane-modified epoxy-polyamine resin comprising a reaction product of an epoxy group-containing polyurethane compound obtained by the reaction of a polyhydroxy compound having a number average molecular weight of 50 to 8,000, a polyisocyanate compound, and a compound containing one hydroxyl group and at least one alicyclic epoxy group in a molecule; a bisphenol compound; a bisphenol diglycidyl ether compound; and an active hydrogen-containing amine compound. Said aqueous resin dispersion has excellent corrosion resistance and is suited especially for cathode electro-deposition coating.

Abstract: A coating resin composition comprising, as a main component, an amino group-containing, lactone-modified epoxy resin derivative obtained by subjecting a hydroxyl group-containing epoxy resin having epoxy equivalent of 200-400 and a cyclic ester compound represented by the general formula (I) ##STR1## (R is a hydrogen atom or a methyl group and n is 3-6) to an addition reaction to obtain an addition product and then reacting the addition product with a polyphenol compound and an amino group-containing compound. The resulting product is then reacted with a partially blocked polyisocyanate.

Abstract: A coating resin composition comprising, as a main component, an amino group-containing, modified epoxy resin derivative obtained by subjecting a hydroxyl group-containing epoxy resin having epoxy equivalent of 200-400 and a cyclic ester compound represented by the general formula (I) ##STR1## (R is a hydrogen atom or a methyl group and n is 3-6) to an addition reaction to obtain an addition product and then adding to the addition product a polyphenol compound and an amino group-containing compound.

Abstract: A cationic electrodeposition coating composition comprising[A] a neutralization product or a quaternary ammonium salt of a comb-shaped copolymer obtained by copolymerizing (a) 3 to 90 parts by weight of an ethylenically unsaturated monomer having a hydrocarbon chain with at least 8 carbon atoms at the molecular ends, (b) 1 to 50 parts by weight of at least one cationic (meth)acrylic monomer selected from the group consisting of aminoalkyl (meth)acrylates, aminoalkyl (meth)acrylamides (meth)acrylates containing a quaternary ammonium salt group and (meth)acrylamides containing a quaternary ammonium salt group, (c) 1 to 60 parts by weight of an alpha,beta-ethylenically unsaturated monomer other than the monomer (b), and (d) 0 to 95 parts by weight of an alpha,beta-ethylenically unsaturated monomer other than the monomers (a), (b) and (c),[B] a cationic epoxy resin capable of being dissolved or dispersed in water, and[C] a pigment.