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Patent
Title
Verfahren und Beschichtungszusammensetzung zur Herstellung einer Antireflexionsbeschichtung
Other Title
Production of anti-reflection coating, e.g. on glass - by applying and heating colloidal solution containing hydrolysis-condensation product of organo-silicon compound and polymer with hydroxyl or amino groups.
Abstract
A process for the production of a porous anti-reflection coating comprises applying a colloidal-disperse solution (CS) to a substrate, drying the coating and removing organic components by heating. Solution CS is obtained by hydrolytic condensation of silicon compound(s) of formula RaSiX4-a (I) and/or precondensates derived from (I), in which R = 1-10C organic residue, optionally with in-chain oxygen and/or sulphur and/or amino groups; X = H, halogen, hydroxy, alkoxy, acyloxy alkylcarbonyl, alkoxycarbonyl or N(R1)2 (with R1 = H, alkyl or aryl); a = 0, 1 or 2. Hydrolysis/condensation is carried out by the action of water or moisture, optionally in presence of solvent and/or catalyst, and solution CS also contains organic polymer(s) with OH and/or NH groups and an average mol. wt. of 200-500,000 (II), in a mol. ratio of 0.1-100 mmols (II)/mol silane. Also claimed are: (i) an anti-reflection made by this process, and (ii) a coating solution (CS) as above. USE - For coating cathode ray tub es, liquid crystal displays, instrument panels, spectacle lenses, projection screens, solar collectors, car windscreens etc. ADVANTAGE - Enables the production of a low-cost anti-reflective coating with increased light transmission, using only one coat which can be applied over a large area with little variation in film thickness. Applicable to various types of substrate, e.g. glass, metals or plastics, and effective with radiation of different wavelengths.
Inventor(s)
Glaubitt, W.
Gombert, A.
Patent Number
1996-19642419
Publication Date
2001
Language
German