Material for and method of preparing water-repellent coatings on optical substrates
AssigneeMerck Patent GmbH
InventorsReiner Dombrowski, Martin Friz
Life of this patent
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Abstract
The invention relates to a material for and method of preparing water-repellent coatings on optical substrates. Compounds of formula I C.sub.n F.sub.2n+1 --(CH.sub.2).sub.m --Si(R.sup.1 R.sup.2 R.sup.3)(I) in which R.sup.1 is alkoxy having 1 to 3 carbon atoms or is C.sub.n F.sub.2n+1 --(CH.sub.2).sub.m --Si(R.sup.2 R.sup.3)--O--, R.sup.2 and R.sup.3 are alkyl or alkoxy having 1 to 3 carbon atoms, n is 1 to 12; and m is 1 to 6, are applied to the substrates by thermal vapor coating in a high vacuum.
Claims3
A method of preparing water-repellent coatings on optical substrates comprising thermal vapor coating, said optical substrate with organosilane compounds in a high vacuum, wherein said thermal vaporization is performed at a pressure of from 10.sup.-3 to 10.sup.-5 mbar and comprises
- impregnating a porous inorganic oxide matrix material with compounds of the formula I
- C.sub.n F.sub.2n+1 --(CH.sub.2).sub.m --Si(R.sup.1 R.sup.2 R.sup.3)(I)
- in which
- R.sup.1 is alkoxy having 1 to 3 carbon atoms or is
- C.sub.n F.sub.2n+1 --(CH.sub.2).sub.m --Si(R.sup.2 R.sup.3)--O--,
- R.sup.2 and R.sup.3 are alkyl or alkoxy having 1 to 3 carbon atoms,
- n is 1 to 12 and
- m is 1 to 6
- evaporating the compounds of formula I from the matrix material in a high vacuum at 300.degree. to 500.degree. C.;
- and
- depositing the evaporated compounds on the surface of an optical substrate heated to 50.degree. to 300.degree. C.
Dependencies are inferred from the claim text.