Patent ID: 6833159
Filing Date: 2004-12-21
Classification: B05D,C03C,C23C,G02B

Abstract:
A method of preparing water-repellent coatings on an ophthalmic lens comprising thermal vapor coating said optical substrate with at least one organosilane compound in a vacuum, wherein said thermal vapor coating comprises:impregnating a non-sintered porous inorganic oxide matrix material consisting essentially of an inorganic oxide matrix of silica, yttria, titania, zirconia, magnesium oxide, alumina, or mixtures thereof with at least one organosilane of the formula I: CnF2n+1C(CH2)mCSi(R1R2R3)â€ƒâ€ƒ(I) â€ƒin which R1 is alkoxy having 1 to 3 carbon atoms or is CnF2n+1C(CH2)mCSi(R2R3)COC, R2 and R3 are alkyl or alkoxy groups having 1 to 3 carbon atoms, n is 1 to 12, and m is 1 to 6; evaporating the at least one organosilane compound from the matrix material in a vacuum of from 10âˆ’3 to 10âˆ’5 mbar at 200Â° C. to 600Â° C.; and depositing the evaporated at least one organosilane compound on the surface of the ophthalmic lens heated to 30Â° C. to 300Â° C., wherein the inorganic oxide matrix material consists of silica, alumina, and yttria.