Lustrous electromagnetic wave transmissive coating film, electromagnetic wave transmissive coating material composition for forming this film, and method of forming electromagnetic wave transmissive coating film therewith

A lustrous electromagnetic wave transmissive coating film comprising:

• dispersed metal nano-particles containing one or more kinds of metals;
• and
• a resin component that contains 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 0.7 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.

An electromagnetic wave transmissive coating material composition for forming a lustrous electromagnetic wave transmissive coating film,

• the composition comprising:
• a solvent;
• dispersed metal nano-particles containing one or more kinds of metals;
• and
• a resin component that 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, wherein
• the resin component includes a first resin containing an oxazoline group and a second resin containing a carboxyl group, in the resin component the carboxyl groups derived from the second resin being present in a molar ratio of 0.7 to 50 times oxazoline group derived from the first resin.