Method and agent for producing hydrophobic layers on fluoride layers
AssigneeMerck Patent GmbH
InventorsUwe Anthes, Reiner Dombrowski, Martin Friz
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Abstract
Process for the production of hydrophobic layers on optical substrates which have an alkaline earth metal fluoride or alkali metal fluoride layer as the outermost layer or consist of alkaline earth metal fluorides or alkali metal fluorides, by thermal vapor deposition with polyfluorohydrocarbons in a high vacuum.
Claims13
A composition for the production of hydrophobic layers on optical substrates which have an alkaline earth metal fluoride or alkali metal fluoride layer as the outermost layer or consist of alkaline earth metal fluorides or alkali metal fluorides, wherein the composition comprises a porous, electrically conductive, inorganic moulding and a polyfluorohydrocarbon and is obtained by a method comprising:
- a) mixing a metal oxide or a silicate with a metal powder and a polyfluorohydrocarbon in a weight ratio, solid weight basis, of from 90:10:1 to 20:80:30, with the addition of water, to obtain a pasty material,
- b) drying the pasty material at from 60 to 120° C. and subsequently heating the material at from 250 to 400° C. in air, and
- c) granulating and tabletting the resultant solid.
Dependencies are inferred from the claim text.