COATING SOLUTION FOR FORMING TRANSPARENT FILM, AND METHOD FOR FORMING SUBSTRATE WITH TRANSPARENT FILM

摘要

This coating solution for forming transparent film is obtained by dispersing fine inorganic oxide particles and a resin emulsion in a dispersion medium containing water and/or an organic solvent. The coating solution has a total solid concentration of 0.03-70wt%, the concentration (CP) of fine inorganic oxide particles in the coating solution is 0.0009-56wt% as solids, and the concentration (CR) of the resin emulsion as solids falls within the range 0.006-68wt%. The total solids concentration of alkali metals contained in the fine inorganic oxide particles does not exceed 1000ppm as oxides (Me2O, Me = Li, Na, K). It is possible to provide a substrate with transparent film, whereby even if this coating solution is coated on a substrate and subsequently stretched, or if the coating solution is applied while the substrate is being stretched, the surface is flat, and the substrate is free from spots and film irregularities (sea-island structures).