Abstract: An object of the present invention is to provide a copolymer having the characteristic of developing high viscosity, and lowering its viscosity with an increase in rate of shear, particularly a copolymer having the characteristic of developing viscosity, and lowering its viscosity with an increase in rate of shear even in an aqueous coating composition that contains a surfactant. The present invention provides a copolymer obtainable by copolymerization of a monomer component (m) that includes: (m-1), a macromonomer having (i) a backbone that comprises a polymer chain having a number average molecular weight of 1,000 to 10,000 obtainable by polymerizing a monomer component (I) that contains 5 to 100 mass % of a C4-C24 alkyl-containing polymerizable unsaturated monomer (a), and (ii) a polymerizable unsaturated group; and (m-2) a polymerizable unsaturated monomer containing a hydrophilic group.

Abstract: An object of the present invention is to provide a coating composition that has excellent curability at low temperatures and in a short period of time, and that also has satisfactory pot life (usable life) and makes it possible to obtain a cured coating film with an excellent finished appearance. The present invention provides a coating composition comprising a secondary hydroxy-containing acrylic resin (A), which is a copolymer of monomer components comprising 20 to 50% by mass of secondary hydroxy-containing polymerizable unsaturated monomer (a) and 50 to 80% by mass of at least one other polymerizable unsaturated monomer (b); a polyisocyanate compound (B); and an organometallic catalyst (C) containing a metallic compound (C1) in which the metal is a member selected from the group consisting of zinc, tin, zirconium, bismuth, lead, cobalt, manganese, titanium, aluminum and molybdenum, and an amidine compound (C2).

Abstract: The present invention provides a method of forming a multi-layered coating film including the steps of (1) forming an undercoating film using an undercoating composition (I), and (2) forming a top coating film on the undercoating film after the formation of the undercoating film, the top coating film being formed using an active energy ray-curable top coating composition (II) containing a silsesquioxane compound (a) and a photoinitiator (b), the silsesquioxane compound (a) containing one or more organic groups each directly bonded to a silicone atom, and at least one of the organic groups having one or more urethane bonds and one (meth)acryloyloxy group.

Abstract: An object of the present invention is to provide a graft copolymer that is usable as various functional materials, that is stimulus responsive, and that is soluble in water at ordinary temperatures; and to provide an aqueous coating composition that comprises the graft copolymer as a thickener. The present invention also provides a rheology modifier for an aqueous coating composition comprising a graft copolymer consisting of (A) a main chain comprising an N-substituted (meth)acrylamide compound and having a lower critical solution temperature in water of 40° C. or higher, and (B) a hydrophobic side chain.

Abstract: An object of the present invention is to provide a coated article having excellent finish and corrosion resistance unaffected by a chemical conversion coating solution even if water washing after a pretreatment step is omitted and a pretreatment solution is carried as a contaminant into an electrodeposition coating composition. The present invention provides a method for forming a multilayer coating film comprising a chemical conversion coating film (F1) and an electrodeposition coating film (F2); the method comprising the following steps. Step 1: immersing a metal substrate in a coating film forming agent (1) as a chemical conversion coating solution to form a chemical conversion coating film (F1); and Step 2: without water washing, subjecting the metal substrate to electrodeposition coating using a coating film forming agent (2) as a cationic electrodeposition coating composition (I) to form an electrodeposition coating film (F2).

Abstract: An object to be attained by the present invention is to provide a method for forming a multilayer coating film having excellent smoothness, distinctness of image, water resistance, adhesion, and popping resistance; moreover, the multilayer coating film has excellent water resistance and adhesion, even when the coating compositions are applied after being stored for a fixed period of time. The present invention provides a method for forming a multilayer coating film comprising applying an aqueous first colored coating composition and a second colored coating composition to a substrate in this order, and heating to simultaneously cure the aqueous first colored coating film and the second colored coating film, wherein the aqueous first colored coating composition comprises an acrylic modified polyester resin and a blocked polyisocyanate compound having a specific blocked isocyanate group.

Abstract: The present invention provides a method for forming a multilayer coating film, the method comprising (1) coating on a substrate an aqueous first colored coating composition containing a pigment and a hydroxy-containing polyester resin-containing film-forming resin having an acid value of 30 mg KOH/g or less; (2) coating an aqueous second colored coating composition containing a film-forming resin and a copolymer obtained by copolymerization of monomer components containing a polymerizable unsaturated monomer having a hydrophilic group, and a macromonomer having a polymerizable unsaturated group and a backbone having a number average molecular weight of 1,000 to 10,000, obtained by polymerization of a monomer component having 5 to 100 mass % of a polymerizable unsaturated monomer having a C4-24 alkyl group; (3) coating a clear coating composition; and (4) simultaneously curing the three coating films formed in steps (1) to (3).

Abstract: It is an object of the present invention to provide an aqueous dispersion of acrylic modified starch with excellent long-term storage stability, as well as an aqueous coating composition that can form a coated film with excellent finished appearance, curability and weather resistance, obtained using the dispersion. The aqueous dispersion of the present invention is obtained by separate graft polymerization of a radical polymerizable unsaturated monomer mixture for formation of a hydrophobic polymer and a radical polymerizable unsaturated monomer mixture for formation of a hydrophilic polymer, in the presence of starch and/or modified starch, and neutralizing the carboxyl groups in the acrylic modified starch with a basic substance if necessary.

Abstract: The objective of the present invention is to provide: an aqueous coating composition which has excellent adhesiveness to a plastic substrate and which is capable of forming a multilayer coating film, which has excellent finishing property and water resistance and in which mixing of the layers does not occur even when preheating is not conducted after coating and the next process of applying a finishing coat is performed thereafter; and a coating method using the composition. This aqueous coating composition is characterized by comprising an aqueous dispersion of a modified polyolefin (A), an aqueous acrylic resin (B) and a blocked polyisocyanate compound having a specific blocked isocyanate (C).

Abstract: The invention offers methods for forming multilayer coating film excelling in smoothness, distinctness of image, water resistance and chipping resistance, the methods comprising successively applying onto a coating object a water-based first coloring paint and a water-based second coloring paint, and simultaneously heating and curing the resultant first colored coating film and second colored coating film, in which the water-based first coloring paint comprises hydroxy-containing polyester resin, curing agent, and water-dispersible acrylic resin which is obtained by polymerization of a monomer component comprising 30-100 mass % of C5-22 alkyl-containing polymerizable unsaturated monomer and 0-70 mass % of polymerizable unsaturated monomer other than the C5-22 alkyl-containing polymerizable unsaturated monomer.

Abstract: A water-based coating composition and method for forming a multi-layer coating film by which it is possible to form a coating film having excellent smoothness, image clarity, and chipping resistance in a 3C1B format. The composition is characterized by containing 7 to 60 mass % of an acrylic resin emulsion (a), 10 to 60 mass % of a film-forming resin (b), and 10 to 50 mass % of a curing agent (c), on the basis of the total mass of the solid resin content in the composition; the acrylic resin emulsion (a) having a core/shell structure where the core section contains, as a copolymer component, 0.1 to 10 mass % of a polymerizable unsaturated monomer having two or more polymerizable unsaturated groups in one molecule, on the basis of the total mass of monomer of the core section, and the hydroxyl value of the core section is 50 to 200 mgKOH/g, and the hydroxyl value of the shell section is 50 to 200 mgKOH/g.

Abstract: An object of the present invention is to provide an aqueous coating composition with excellent finished appearance and removability in bell cleaning, and a method for forming a multilayer coating film having excellent smoothness by a 3-coat-1-bake method including successively applying an aqueous first colored coating composition, an aqueous second colored coating composition, and a clear coating composition to a substrate, and heat-curing the resulting three layers of the multilayer coating film all at once.

Abstract: The first objective of the present invention is to provide an aqueous paint composition that can form a paint film with excellent smoothness, image clarity, adhesion and water resistance. This aqueous paint is characterized in comprising (A) an aqueous dispersion of an acrylic modified polyester resin, (B) a block polyisocyanate compound having a nonionic hydrophilic group, and (C) an aqueous dispersion of acrylic polymer fine particles.

Abstract: The present invention provides a cationic electrodeposition coating composition that has excellent throwing power and that can form a thin film with excellent finish and anti-corrosion properties. The composition has a cationic epoxy resin (A) and a blocked polyisocyanate (B), the cationic epoxy resin (A) obtained by reacting an epoxy resin (A1) with an amino group-containing compound (A2). The epoxy resin (A1) having a catechol skeleton structure (a) and obtained by reacting an epoxy resin (a1) containing at least one epoxy group per molecule and having an epoxy equivalent of 180 to 500 with a phenolic hydroxyl group-containing compound (a2) containing at least one phenolic hydroxyl group per molecule in amounts wherein the ratio of the number of moles of epoxy groups in the epoxy resin (a1) to the number of moles of phenolic hydroxyl groups in the phenolic hydroxyl group-containing compound (a2) is 1.3 to 2.0.

Abstract: A method of forming a multilayer coating film with smoothness, distinct image, adhesion and water resistance when a plurality of uncured coating films are cured at once, and especially when cured at low temperature. The method includes the following steps 1-1 to 1-4: step 1-1: coating an article with a primer coating composition (X) and forming an uncured primer coating film on the article, step 1-2: a coating the article having the uncured primer coating film with an aqueous colored coating composition (Y1) for a base coat, to form an uncured base coat film thereover, step 1-3: coating the article having the uncured primer coating film and uncured base coat film, with a clear coating composition (Z), and forming an uncured clear coating film thereover, and step 1-4: a curing the uncured primer coating film, the uncured base coat coating film and the uncured clear coating film by heating.

Abstract: This invention provides a method for forming multilayer coating film excelling in smoothness and distinctness of image, by 3-coat-1-bake system in which a step of applying onto a coating object a water-based intermediate paint (X) to form an intermediate coating film; a step of adjusting the solid content of the intermediate coating film to 70-100 mass %; a step of applying onto the intermediate coating film a water-based base coating paint (Y) containing 30-55 mass parts of alcoholic solvent having a boiling point of 170-250° C., to form a base coating film; a step of adjusting the solid content of the base coating film to 70-100 mass %; a step of applying a clear paint (Z) comprising 40-60 mass parts of carboxyl-containing compound and 60-40 mass parts of polyepoxide onto the base coating film to form a clear coating film; and heating the intermediate coating film, base coating film and clear coating film at 100-120° C. for 3-10 minutes and thereafter further heating them at 130-160° C.

Abstract: An object to be attained by the present invention is to provide an active energy ray-curable composition that is capable of producing a cured coating film having high scratch resistance and excellent transparency. The present invention relates to an active energy ray-curable composition containing a reactive particle (A) obtained by reacting a silica fine particle (a-1) and a hydrolysable silane (a-2) having one or more (meth)acryloyloxy groups and one or more isocyanurate ring structures in a molecule. The present invention also provides the active energy ray-curable composition according to the above, containing a photopolymerization initiator (B).

Abstract: This invention provides a method for forming multilayer coating film, which comprises successively carrying out a step of applying an intermediate paint onto a coating object to form an intermediate coating film; a step of forming a base coating film by applying onto the intermediate coating film a water-based base coating paint; a step of forming a clear coating film by applying onto the base coating film a clear coating paint, and a step of heating the uncured intermediate coating film, base coating film and clear coating film to simultaneously cure these three coating films; wherein the intermediate paint has a complex viscosity at 40° C. (?*40) of not higher than 100 Pa·sec under the conditions of shear stress, 1.0 Pa and frequency, 0.1 Hz, and a complex viscosity at 80° C. (?*80) of at least 800 Pa·sec under the conditions of shear stress, 1.0 Pa and frequency, 0.1 Hz.

Abstract: An objective of the present invention is to provide immunoassay microchips in which microstructures of beads having a sufficient reaction area were constructed within microchannels while suppressing flow path resistance, and to provide simple and highly-sensitive immunoassay methods for microsamples. The objective was achieved by immunoassay microchips comprising microchannels with microstructures arranged in at least a portion of the microchannels, the microstructures retaining microbeads uniformly dispersed in photo-cured hydrophilic resins, and the microbeads having a primary antibody immobilized on their surfaces, and by immunoassay methods using the microchips.

Abstract: The present invention provides an aqueous base coating composition comprising (A) a hydroxy-containing resin, (B) a melamine resin with a weight average molecular weight of 1,000 to 5,000, and (C) a diester compound represented by Formula (1); and a method for forming a multilayer coating film using this aqueous base coating composition.