Abstract: The pretreatment agent for use before forming a coat by paint application of the present invention contains (A) one or more metal elements selected from a group consisting of zirconium, titanium and hafnium, (B) fluorine, (C) one or more coupling agents selected from an amino group-containing silane coupling agent, its hydrolyzate, and its polymer, and (D) a component of at least one of an allylamine and a polyallylamine, in which the ratio by mass of the coupling agent (C) to the component (D), (C/D) is 1 or more. The coating method by paint application of the present invention includes a chemical conversion treatment step of chemically treating a metal substrate with the pretreatment agent, and a step of forming a coat by paint application on the chemically-treated metal substrate.

Abstract: A metal surface treatment agent and a metal surface treatment which impart excellent electrodeposition coatability (smoothness and throwing power) to a metallic base while heightening corrosion resistance. The metal surface treatment agent that is used in a pretreatment of an electrodeposition coating of a metallic base and includes one or more zirconium, titanium, or hafnium metallic elements, one or more silane coupling agents, hydrolysates thereof, or polymers thereof, and an electrophilic reactive group-containing compound (C) containing a homocycle and a heterocycle in one molecule and has a water solubility at 20° C. of 0.2 to 30 g/L, and the contents of the metallic elements, the coupling agents, and the electrophilic reactive group-containing compound satisfy a given relationship.

Abstract: A metal surface treatment agent and a metal surface treatment which impart excellent electrodeposition coatability (smoothness and throwing power) to a metallic base while heightening corrosion resistance. The metal surface treatment agent that is used in a pretreatment of an electrodeposition coating of a metallic base and includes one or more zirconium, titanium, or hafnium metallic elements, one or more silane coupling agents, hydrolysates thereof, or polymers thereof, and an electrophilic reactive group-containing compound (C) containing a homocycle and a heterocycle in one molecule and has a water solubility at 20° C. of 0.2 to 30 g/L, and the contents of the metallic elements, the coupling agents, and the electrophilic reactive group-containing compound satisfy a given relationship.

Abstract: The pretreatment agent for use before forming a coat by paint application of the present invention contains (A) one or more metal elements selected from a group consisting of zirconium, titanium and hafnium, (B) fluorine, (C) one or more coupling agents selected from an amino group-containing silane coupling agent, its hydrolyzate, and its polymer, and (D) a component of at least one of an allylamine and a polyallylamine, in which the ratio by mass of the coupling agent (C) to the component (D), (C/D) is 1 or more. The coating method by paint application of the present invention includes a chemical conversion treatment step of chemically treating a metal substrate with the pretreatment agent, and a step of forming a coat by paint application on the chemically-treated metal substrate.

Abstract: The present invention relates to a cationic electrodeposition coating composition, which provides an uncured electrodeposited film having storage elasticity modulus (G?) at 140° C. within a range of from 80 to 500 dyn/cm2 and loss elasticity modulus (G?) at 80° C. within a range of from 10 to 150 dyn/cm2, and which is superior in smoothness and edge coatability; and a method for establishing both of smoothness and edge coatability therewith; as well as; a cationic electrodeposition coating composition comprising crosslinked resin particles having an average particle size within a range of from 1.0 to 3.0 ?m and thermal softening temperature within a range of from 120 to 180° C.

Abstract: The water dispersible resin of the present invention is contained in a base component of a two-component thermosetting resin composition. The water dispersible resin is prepared by dispersing a solvent resin in water, which solvent resin is obtained by solution polymerization, carried out in two or more stages, of a monomer mixture containing a polyfunctional monomer, an acid group-containing monomer, and a hydroxyl group-containing monomer, the polyfunctional monomer having a plurality of vinyl groups in its single molecule. The monomer mixture contains the polyfunctional monomer by not less than 0.1% by weight but not more than 3% by weight, and the water dispersible resin thus obtained has an acid value of solid content of not less than 10 mgKOH/g but not more than 45 mgKOH/g, a hydroxyl value of solid content of not less than 50 but not more than 200, and a viscosity of not less than 50 mPa·s but not more than 10,000 mPa·s when a nonvolatile content is 45% by weight.

Abstract: The present invention provides a water-based intermediate coating composition having excellent chipping resistance and water resistance when made into a multilayer coating film, and providing excellent adaptability with a top coating film and a base coating film and excellent finish appearance, and a method for forming a multilayer coating film using the same.

Abstract: To provide a method for forming an electrodeposited coating excellent in finish-appearance and capable of a higher film resistance value. A method for forming an electrodeposited coating including a step of electrodeosition-coating a cationic electrodeposition coating composition on an object to be coated, wherein a film viscosity of an electrodeposited coating obtained from the cationic electrodeposition coating composition is in the range of 3000 to 5000 Pa·s at 50° C.

Abstract: The present invention relates to a cationic electrodeposition coating composition which hardly shows poor appearance on a coating film and has high throwing power. The present invention provides a cationic electrodeposition coating composition comprising a binder resin composed of an amine-modified bisphenol epoxy resin and a blocked isocyanate curing agent in emulsification state, wherein the emulsification of the binder resin is conducted by either an amine-modified bisphenol epoxy resin having a quaternary ammonium group or an emulsifying resin having a quaternary ammonium group as an additional component other than the binder resin.

Abstract: The present invention provides a cationic electrodeposition coating composition which can provide an electrodeposition coating film having low specular gloss and excellent finished appearance. The present invention relates to a cationic electrodeposition coating composition comprising a cationic emulsion (A) which comprises (a) a cationic epoxy resin and (c) a blocked isocyanate curing agent, and a cationic emulsion (B) which comprises (b) at least one resin selected from the group consisting of a cation-modified acrylic resin and a cationic epoxy resin other than the cationic epoxy resin (a) and (d) a blocked isocyanate curing agent, wherein a difference ??A-B between a solubility parameter ?A of a resin component in the cationic emulsion (A) and a solubility parameter ?B of a resin component in the cationic emulsion (B) is within a range of from 0.5 to 1.

Abstract: The present invention provides a cationic electrodeposition coating composition having controlled electric conductivity and controlled average particle size of the binder resin emulsion. One embodiment of the present invention provides a cationic electrodeposition coating composition comprising a binder resin emulsion, wherein the binder resin emulsion comprises; (a) amine-modified epoxy resin having an amino group, (b) blocked isocyanate curing agent, and (c) modified epoxy resin having an onium group.

Abstract: The present invention provides a process for forming a multi layered coated film having good finished appearance. The present invention relates to a process for forming a multi layered coated film comprising the steps of conducting electrodeposition coating with a cationic electrodeposition coating composition on a substrate, and then heating and curing it to form an cured electrodeposition coated film on the substrate, applying an intermediate coating composition on the cured coated film to form an uncured intermediate coated film, applying a base top coating composition on the uncured intermediate coated film to form an uncured base coated film, applying a clear top coating composition on the uncured base coated film to form an uncured clear coated film, and simultaneously heating and curing the three uncured coated films, wherein the cured electrodeposition coated film has specified ranges of Ra and Pa; or has specified ranges of Tg and crosslinking density.

Abstract: The present invention is to provide a method for forming a plural-layered coated film which is excellent in surface smoothness while phase mixing between an intermediate coating film and a base coating film is effectively prevented. The method comprises coating successively an aqueous intermediate coating paint, an aqueous base paint and a clear paint on an electrodeposition coated film in a wet-on-wet manner, and baking and curing them at the same time, wherein an intermediate coating film formed of the aqueous intermediate coating paint has a water absorption rate of coating film of 10% or less and a water dissolving rate of coating film of 5%, and the aqueous intermediate coating paint contains an acrylic resin emulsion, a urethane resin emulsion, and a curing agent.

Abstract: The present invention provides a water-based intermediate coating composition having excellent chipping resistance and water resistance when made into a multilayer coating film, and providing excellent adaptability with a top coating film and a base coating film and excellent finish appearance, and a method for forming a multilayer coating film using the same.

Abstract: The present invention provides a method of forming a multilayer coating film comprising the step (I) of coating an article to be coated with an electrodeposition coating containing two resin components incompatible with each other followed by curing by heating to form an electrodeposited coating film, the step (II) of applying a water-borne intermediate coating onto the electrodeposited coating film to form an uncured intermediate coating film, the step (III) of applying a water-borne base coating onto the intermediate coating film to form an uncured base coating film, the step (IV) of applying a clear coating onto the base coating film to form an uncured clear coating film and the step (V) of curing the intermediate coating film, the base coating film and the clear coating film simultaneously by heating to thereby obtain a multilayer coating film.

Abstract: It is an object of the present invention to provide a method of forming a multilayer coating film by which the multilayer coating film comparable in shock resistance, in particular chipping resistance, to the conventional three-coat films and resistant to yellowing and having a good appearance can be formed in the three-wet coating system which is intended for coating process curtailment, cost reduction and environmental impact reduction.