Patent ID: 6337133
Filing Date: 2002-01-08
Classification: C03C,C09K,Y10T

Abstract:
A water-repellent glass pane having a glass substrate and a water-repellent film formed on the glass substrate, said glass pane being prepared by a method comprising sequential steps of:(a) forming a mixture consisting essentially of 1 part by weight of at least one fluoroalkylalkoxysilane for producing said water-repellent film, 5-40 parts by weight of an organic solvent for diluting said at least one fluoroalkylalkoxysilane, and an acid catalyst containing water for hydrolyzing said at least one fluoroalkylalkoxysilane, such that said at least one fluoroalkylalkoxysilane is subjected to hydrolysis and then to dehydration and polycondensation, thereby to turn a mixture of said at least one fluoroalkylalkoxysilane, said organic solvent and said acid catalyst into a sol; (b) removing water from said sol to adjust water content of said sol to less than about 4000 ppm, thereby to prepare a coating liquid; and (c) applying said coating liquid to said glass substrate, wherein said water in the acid catalyst is in an amount of from 0.09 part by weight or greater relative to said 1 part by weight of said at least one fluoroalkylalkoxysilane.