Production method and a resin thin film-forming composition of the resin thin film

A not only excellent in heat resistance, resin film also has a feature that retardation is low, in particular a resin thin film formation to provide a manufacturing method and the resin thin film and such resin thin preferred resin thin film as the substrate for a flexible device and to provide a use composition. A polyimide obtained by imidizing the polyamic acid obtained by reacting a diamine component containing an alicyclic tetracarboxylic acid dianhydride component and a fluorine-containing aromatic diamine containing dianhydride, nitrogen the average silicon dioxide particles the particle diameter of 100nm or less, and a manufacturing method of a resin film, which comprises using a resin film-forming composition comprising an organic solvent which is calculated from the specific surface area value measured by the adsorption method. .BACKGROUND