Hydrophobic layer formation on optical substrates for e.g. lenses, comprises thermally vaporizing alkali(ne earth) metal fluoride outer layer with polyfluorohydrocarbons

摘要

Production of hydrophobic layers on optical substrates comprises thermally vaporizing the outermost layer made of an alkali or alkaline earth metal fluoride with polyfluorohydrocarbons in a high vacuum. An Independent claim is also included for an agent used in the production of hydrophobic layers on optical substrates comprising a porous inorganic molding or porous electrically conducting inorganic molding and a polyfluorohydrocarbon. The polyfluorohydrocarbon is obtained by mixing a metal oxide or a silicate with an aqueous suspension of a polyfluorohydrocarbon or a metal powder and an aqueous suspension of a polyfluorohydrocarbon with the addition of water in a ratio of 99-80:1-20. The pasty composition is dried at 60-120 deg C and tempered at 250-400 deg C in air. Then the solid obtained is granulated and tabletted.