| 摘要 |
A screen comprising a glass substrate, possibly coated with several layers, and a coating which comprises a sublayer of mineral cpds. and a hydrophobic-oleophobic coating. The density of the mineral sub-layer is at least equal to 80% of that of the material of which it is constituted. The sublayer is constituted of one of the materials: Al2O3, Ga2O3, SnO2, TiO2, Ta2O5, Cr2O3, ZrO2, Nb2O5, In2O3, Fe2O3, CoO3,V2O5,Y2O3, TiN, SiOx (x = 1 or 2) and SiOpCq (p = 1-2 and q = 0 or 1), alone or in combination. The thickness of the layer is 80-5000 Angstrom . The mass density, i.e. the density of the crystalline species, is≥90% of the materials of the sublayer. More pref., the compsn. of the sublayer is SnO2 doped with F. The hydrophobic-oleophobic layer comprises at least 1 hydrolysable fluorinated alkylsilane or a mixt. of these with other silanes. More pref. it is a perfluoro-alkylsilane of formula: CF3-(CF2)n-(CH2)m-SiX3, where n = 0-12; m = 2-5; and X = a hydrolysable gp.. The thickness of the coating is 10-50 Angstrom . The coated screen pref. comprises a glass substrate with a functional coating stack. The final coating comprising a mineral layer (of density≥80%) covered with a hydrophobic/oleophobic coating as described above. The angle of contact of a drop on the surface, having been subjected to 500 rotations of a grindstone (ASTM D1044-78 standard), is >60 degrees . The functional coating is anti-reflective or low emissive and/or conductive. Prodn. of the screen comprises: deposition of a hydrophobic/oleophobic layer on a dense mineral sublayer (after cleaning of the latter) by contact with a soln. contg. a hydrolysable fluorinated alkylsilane in a non-polar solvent system; or cleaning of the substrate to be coated, deposition of a mineral sub-layer (of density≥80%), cleaning of the sublayer, deposition of a hydrophobic/oleophobic coating. |
