Composition for preparing water-repellent coatings on optical substrates
AssigneeMerck Patent Gesellschaft mit
InventorsUwe Anthes, Reiner Dombrowski
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Abstract
Composition for preparing water-repellent coatings on optical substrates, comprising a porous, electrically conductive molding and an organosilicon compound, obtainable by mixing an electrically conductive or semiconductive support material with a binder and subjecting the mixture to compression molding to form a compression molding, sintering the compression molding at preferably 1100 to 1500° C. in air to form a porous molding, impregnating the molding with the organosilicon compound, and ageing the impregnated molding by storage in air for at least 3 days.
Claims30
A composition for preparing water-repellent coatings on optical substrates, comprising a porous, electrically conductive molding and an organosilicon compound, obtainable by
- a) mixing an electrically conductive or semiconductive support material comprising carbon;
- a conductive metal oxide, carbide, nitride or silicide;
- a metal powder and a non-conductive material;
- or a mixture thereof with a binder and subjecting the mixture to compression molding to form a compression molding,
- b) sintering the compression molding at from 1100 to 1500° C. in air to form a porous molding,
- c) impregnating the molding with the organosilicon compound, and
- d) ageing the impregnated molding by storage in air for at least 3 days.
A composition for preparing a water-repellant coating on an optical substrate, wherein said composition comprises:
- a porous, electrically conductive molding and an organosilicon compound,
- wherein said composition is obtained by ageing a sintered compression molding which is impregnated with an organosilicon compound,
- and wherein said electrically conductive molding comprises carbon;
- a conductive metal oxide, carbide, nitride or silicide;
- a metal powder and a nonconductive material;
- or a mixture thereof.
A composition for preparing a water-repellant coating on an optical substrate, comprising an organosilicon compound and a porous, electrically conductive molding, wherein said electrically conductive molding comprises
- a) an electrically conductive metal oxide, carbide, nitride or silicide,
- b) carbon,
- c) a metal powder and a non-conductive material, or
- d) a mixture thereof.
A method of making a composition for preparing a water-repellent coating on an optical substrate, comprising:
- a) mixing an electrically conductive or semiconductive support material comprising carbon;
- a conductive metal oxide, carbide, nitride or silicide;
- a metal powder and a non-conductive material;
- or a mixture thereof with a binder and subjecting the mixture to compression molding to form a compression molding,
- b) sintering the compression molding at from 1100 to 1500° C. in air to form a porous molding,
- c) impregnating the molding with the organosilicon compound, and
- d) ageing the impregnated molding.
A method of making a composition for preparing a water-repellant coating on an optical substrate, comprising ageing a sintered compression molding of carbon, or a conductive metal oxide, carbide, nitride or silicide, or a metal powder and a non-conductive material, or a mixture thereof, which is impregnated with an organosilicon compound.
Dependencies are inferred from the claim text.