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: An electrodeposition paint composition which contains a titanium oxide pigment coated with 1 to 10% by weight of an zinc compound in terms of metal zinc based on the titanium oxide. It is possible by use of the composition to form a coating film excellent in corrosion resistance without using an anticorrosive pigment having a problem on measures against environmental pollution.

Abstract: Cationically electrodepositable (gelled) fine particles using, as the base, an epoxy resin-amine adduct having hydrolysable alkoxysilane groups, and a cationic electrodeposition paint composition comprising said fine particles. Said fine particles give a paint film having excellent corrosion resistance and are useful as a rheology-controlling agent for cationic electrodeposition paint. Said electrodeposition paint composition has an excellent edge-covering property, and a paint film formed therewith on an article to be coated can give improved corrosion resistance to the edges of said article and has good surface smoothness.

Abstract: The invention provides a film-formable, chelate-forming resin having, per 1000 g of the resin, about 0.2 to about 3.5 moles of chelate-forming group represented by the formula [1], [2], [3] or [4]: ##STR1## wherein R.sup.1 and R.sup.2 are the same or different and each represents a hydrogen atom, a halogen atom, a nitro group, a nitroso group, a cyano group, a hydrocarbon group having up to 18 carbon atoms, or an alkoxyalkyl group having up to 12 carbon atoms, and a process for preparing the resin.The invention also provides a metal surface treating composition and a corrosion preventive coating composition both containing the above chelate-forming resin, and a chelate-forming resin composition comprising the resin and a crosslinking agent.

Abstract: A blocked isocyanate group-containing electrocoating composition comprising at least one dialkyltin aromatic carboxylate and at least one bismuth or zirconium compound as a combined curing catalyst. This electrocoating composition gives an electrocoating film superior in corrosion resistance and low-temperature curability and has good bath stability over an extended period.

Abstract: An electrodeposition paint composition which contains at least one lanthanum compound. When this composition is used, electrolytically deposited coating films exhibiting excellent corrosion resistance can be provided, without using rust inhibiting pigments such as of lead compounds or chromium compounds which are liable to cause environmental pollution.

Abstract: A cationically electrodepositable finely divided gelled polymer obtained by emulsion-polymerizing, in the presence of a water-soluble or water-dispersible cationic resin, a monomer component (A) comprising(a) a polymerizable unsaturated vinylsilane monomer having a vinylic double bond and a hydrolyzable akloxysilane group,(b) a polymerizable monomer having at least two radically polymerizable unsaturated groups in the molecule,(c) a polymerizable unsaturated monomer having a vinylic double bond and a hydroxyl group, and(d) other polymerizable unsaturated monomer, and a cationically electrodepositable finely divided gelled polymer obtained by emulsion-polymerizing, in the presence of the above finely divided gelled polymer, a monomer component (B) comprising(e) a blocked mono- or polyisocyanate in which the at least one isocyanate group in the molecule is blocked with a radically polymerizable monohydroxy compound,(f) a polymerizable unsaturated monomer having a vinylic double bond and a hydroxyl group, and(g)

Abstract: A process for coating a metallic substrate, characterized by applying on a metallic substrate a electrocoating paint, applying thereon a barrier coat comprising a film-forming thermoplastic resin other than a modified polyolefin resin and capable of forming a barrier coat film having a static glass transition temperature of 0.degree. to -75.degree. C., optionally applying on said barrier coat an intermediate coating paint and then applying thereon a top coating paint.

Abstract: A process for coating a metallic substrate, characterized by applying on a metallic substrate an electrocoating paint, applying thereon a barrier coat comprising a film-forming thermoplastic resin other than a modified polyolefin resin and capable of forming a barrier coat film having a static glass transition temperature of 0.degree. to -75.degree. C., optionally applying on said barrier coat an intermediate coating paint and then applying thereon a top coating paint.

Abstract: A coating method, which comprises(i) applying to a substrate a multilayer film-forming cationic electrodeposition paint composed of(A) a cationic electrodepositable epoxy resin having a surface tension of 40 to 60 dynes/cm and being able to form a cathodically electrodepositable aqueous bath by neutralization with an acid, and(B) a nonionic film-forming resin having a surface tension of 25 to 45 dynes/cm,the weight ratio of resin (A) to resin (B) being from 60:40 to 98:2 and the surface tension of resin (A) being greater than that of resin (B), and curing the coated film by heating,(ii) applying a water-base or organic solvent-base colored paint as a first top coat, and(iii) applying as a second top coat a powder paint capable of forming a transparent film which may be colored.

Abstract: A cationic electrodeposition coating composition for forming a multilayer film, said composition comprising(A) an epoxy-type cationic electrodepositable resin which is an addition-reaction product formed between an epoxy resin and a basic amino compound, having a surface tension of 40 to 60 dynes/cm and being capable of forming a cathodically depositable aqueous bath by neutralization with an acid,(B) a non-ionic, non-selfcurable, film-forming resin having a surface tension of 25 to 45 dynes/cm, and(C) a blocked polyisocyanate compound as a curing agent,the weight ratio of resin (A) to resin (B) being from 60:40 to 98:2, and the surface tension of resin (A) being at least 5 dynes/cm higher than that of resin (B), and resin (A), resin (B) and the polyisocyanate compound (C) having substantially no ethylenically double bond.

Abstract: An electrodeposition coating composition containing blocked isocyanate groups comprising at least one dialkyltin aromatic carboxylic acid salt represented by the following formula ##STR1## wherein R represents an alkyl group having 1 to 12 carbon atoms, and R.sup.1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

Abstract: A process for forming a composite coated film, which comprises coating a cationically electrodepositing paint composed mainly of a cationic resin having a functional group capable of reacting with isocyanate groups on the surface of a substrate, then coating an organic solvent-base paint containing a polyisocyanate compound and capable of forming a coated film having a static glass transition temperature of 0.degree. to -75.degree. C. on the surface of the electrodeposited paint film, and then coating a top coat paint.

Abstract: A method of electrodeposition coating, which comprises performing a first electrodeposition coating on an article as a cathode using (I) a cationic electrodeposition paint comprising (A) a resin and (B) at least one pigment, said pigment (B) containing at least 5% by weight of a pigment having an oil absorption of at least 100 and being incorporated so that the total oil absorption of the pigment (B) is in the range of 1,000 to 10,000 per 100 g of the resin (A), then while the resulting coated film is in the uncured state, performing a second electrodeposition coating on it using (II) an emulsion-type cationic electrodeposition coating paint comprising a resin (C) and a pigment (D) and having a minimum electrodeposition current density of not more than 0.7 mA/cm.sup.

Abstract: This invention provides a coating method comprising the steps of applying to an electroconductive substrate a cationic electrophoretic primer which contains a binder resin having in its molecule a functional group capable of reacting with an isocyanate group under a curing condition to form a primer coat, applying to the primer coat a surfacer or topcoating containing a hydroxyl-containing resin and polyisocyanate compound to form a surfacer coat or topcoat and curing the two coats at the same time at a temperature between room temperature and about 130.degree. C.

Abstract: A process for coating automotive bodies which are composed of metallic members and plastic members, said process comprising assembling metallic members and plastic members into automotive outer bodies, applying a cation type electrocoating to the metallic members either before or after the assembling, applying onto the surfaces of the two types of members including the electrocoated surfaces of the assembled body a barrier coat comprising a modified polyolefin resin and capable of forming a barrier coat film having a static glass transition temperature of 0.degree. to -60.degree. C., optionally applying on said barrier coat an intermediate coating paint and then applying thereon a top coating paint.

Abstract: A process for coating a metallic substrate, characterized by applying on a metallic substrate a cation type electrocoating paint, applying thereon a barrier coat comprising a modified polyolefin resin and capable of forming a barrier coat film having a static glass transition temperature of 0.degree. to -60.degree. C. and a corrosion-preventive pigment, optionally applying on said barrier coat an intermediate coating paint and then applying thereon a top coating paint.

Abstract: A process for coating a metallic substrate, characterized by applying on a metallic substrate a cation type electrocoating paint, applying thereon a barrier coat comprising a modified polyolefin resin and capable of forming a barrier coat film having a static glass transition temperature of 0.degree. to -60.degree. C., optionally applying on said barrier coat an intermediate coating paint and then applying thereon a top coating paint.