To provide a method for making a coating film of water-repellent coating in which polytetrafluoroethylene is dispersed uniformly in a fluororesin binder, air layers between them are removed, and the light transmission of the coating film is increased.
In a method for making a coating film, water-repellent coating in which 10-90% of solid of polytetrafluoroethylene of 500-20,000 molecular weight is dispersed in a binder of a fluororesin other than the polymer or water- repellent coating in which a specified amount of perfluoropolyether oil is added to the above coating is applied on a substrate, and after volatile components being removed, the coating film is heat-treated. In this process, the temperature of heat treatment is preferably regulated at 230-260°C. The method is applied appropriately to the surface treatment of glass.
FUJIMORI SUSUMU
TABEI HISAO
MATSUURA TAKETOSHI
HAGA YOSHIMASA
UEDA TOSHINOBU
NTT ADVANCED TECH KK