Abstract: A lustrous electromagnetic wave transmissive coating film includes: metal nano-particles containing one or more kinds of metals; and a first resin containing an oxazoline group and, a second resin containing a carboxyl group, in the resin component the carboxyl group derived from the second resin being present in a molar ratio of 0.03 to 50 times the oxazoline group derived from the first resin; wherein the resin component is soluble in ethanol, or, when water is added to a diethylene glycol diethyl ether solution obtained by dissolving 0.5 g of the resin component in 10 ml of diethylene glycol diethyl ether, an addition amount of the water until the diethylene glycol diethyl ether solution becomes turbid is 1.5 ml or more.

Abstract: A method for forming a glittering coating film in which after a glittering base coating film is formed on a substrate to be coated by applying thereto a glittering base coating material containing a colloid particle liquid containing noble metal or copper colloid particles, the glittering base coating film is heated or set, and then a clear coating film is formed. By the method, a glittering coating film is provided which has weathering resistance and high gloss, and develops a metal feeling or a coloring metal feeling giving rise to a less feeling of metal particles than by the plating-tone coating film, and superior in design property.

Abstract: Disclosed is a method for forming a glittering coating film in which after a glittering base coating film is formed on a substrate to be coated by applying thereto a glittering base coating material containing a colloid particle liquid containing noble metal or copper colloid particles, said glittering base coating film is heated or set, and then a clear coating film is formed by executing any one of the following processes (A) to (F). By the method, a glittering coating film is provided which has weathering resistance and high gloss, and develops a metal feeling or a coloring metal feeling giving rise to a less feeling of metal particles than by the plating-tone coating film, and superior in design property.

Abstract: A metal colloid luster color material having an unique appearance without using any organic color material that is deficient in weather resistance as the coloring component is obtained.

Abstract: The metal colloid pattern formation method is a method for forming metal colloid patterns on a substrate by forming a photosensitive layer on a substrate by applying a photosensitive resin composition containing an organic solvent and a polysilane soluble in the organic solvent to the substrate, forming a latent image of the patterns by selectively exposing the photosensitive layer, bringing a metal colloid-containing solution into contact with the photosensitive layer, and forming patterns of the metal colloid by adsorbing the metal colloid in the exposed parts.