METHOD OF FORMING HYDROPHILIC INORGANIC COATING FILM AND INORGANIC COATING COMPOSITION

摘要

A method of forming a hydrophilic inorganic coating film on a surface of a substrate which comprises the steps of: (1) obtaining an inorganic coating composition which contains as the main component a silicone resin obtained by subjecting only a tetrafunctional alkoxysilane represented by the formula: Si(OR)4 (wherein R is alkyl having up to 7 carbon atoms or aryl) to hydrolytic polycondensation and has a total solid content of 5 wt.% or lower; (2) applying the inorganic coating composition to the substrate surface to form a coating layer; and (3) drying and curing the coating layer to form a cured film having a thickness of 0.01 to 0.5 .mu.m. The surface of the hydrophilic inorganic coating film thus formed has a high-degree of hydrophilicity even immediately after the film formation or even when the film is less apt to be irradiated with ultraviolet.