CURED FILM, LAMINATED STRUCTURE WITH CURED FILM, AND ELECTRONIC COMPONENT

Provided is a cured film comprising a cured product of a curable resin composition containing titanium dioxide, wherein the cured film has excellent reflectivity and insulation reliability. This cured film comprises two or three layers of a curable resin composition containing at least a carboxyl-group-containing resin, titanium oxide, and a thermosetting component. If a side surface of the cured film is polished with sandpaper to expose a cross-section and the exposed cross-section is polished using an ion milling device under the following conditions, and thereafter the polished cross-section is observed and elementally analyzed using a scanning electron microscope-energy dispersive X-ray analysis under the following conditions, all of C1/4T, C2/4T, C3/4T, and C4/4T are within the range of 0.7Ctotal to 1.0Ctotal and the maximum concentration difference ratio for C1/4T, C2/4T, C3/4T, and C4/4T is 1.05 or more, where T is taken to be the thickness (μｍ) of the cured film, C1/4 is taken to be the titanium oxide concentration (mass%) in an area from the surface layer face (T=0) to the thickness direction 1/4T of the cured film, C2/4T is taken to be the titanium oxide concentration (mass%) in an area from the thickness direction 1/4T to the thickness direction 2/4T of the cured film, C3/4T is taken to be the titanium oxide concentration (mass%) in an area from the thickness direction 2/4T to the thickness direction 3/4T of the cured film, C4/4T is taken to be the titanium oxide concentration (mass%) in an area from the thickness direction 3/4T to the thickness direction 4/4T of the cured film, and Ctotal is taken to be the titanium oxide concentration (mass%) over the entire thickness direction of the cured film. La présente invention concerne un film durci comprenant un produit durci d'une composition de résine durcissable contenant du dioxyde de titane, le film durci présentant une excellente réflectivité et une excellente fiabilité d'isolation. Ce film durci comprend deux ou trois couches d'une composition de résine durcissable contenant au moins une résine contenant un groupe carboxyle, de l'oxyde de titane et un composant thermodurcissable. Si une surface latérale du film durci est polie avec du papier abrasif pour exposer une section transversale et que la section transversale exposée est polie à l'aide d'un dispositif de broyage ionique dans les conditions suivantes, et qu'ensuite la section transversale polie est observée et analysée de manière élément