Transparent substrate bearing an anti-stain, hydrophobic...

B - Operations – Transporting – 05 – D

Patent

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Details

B05D 3/02 (2006.01) B05D 5/06 (2006.01) B32B 9/00 (2006.01) B32B 9/04 (2006.01) B32B 13/12 (2006.01) B32B 17/06 (2006.01) C03C 17/30 (2006.01) C09D 4/00 (2006.01) G02B 1/10 (2006.01)

Patent

CA 2305513

A process is described for applying a thin-film, hydrophobic, oil-repellant, stain-resistant, optical coating to a transparent substrate. The coating is applied using a treatment solution that incorporates an organosilane in a solvent of water, alcohol, and ethylene glycol or glycerol, and an acid catalyst, with the organosilane having a preferred concentration in the range of 0.05 to 50 mmole per liter. The treatment solution preferably is prepared in a two-step procedure, in which the organosilane is first reacted in concentrated form and then diluted. After the treatment solution has been applied to the transparent substrate, e. g., by dip coating, the coated substrate is dried, preferably by flash-drying at room temperature and then heating it to a prescribed elevated temperature, in a prescribed humidity.

L'invention concerne un procédé d'application d'une couche optique en couche mince, hydrophobe, oléophobe, anti-tache sur un substrat transparent. La couche est appliquée à l'aide d'une solution de traitement contenant un organosilane dans un solvant contenant de l'eau, de l'alcool, ainsi que de l'éthylène glycol ou du glycérol, et un catalyseur acide, l'organosilane ayant un concentration préférée comprise dans la plage de 0,05 à 50 mmole par litre. La solution de traitement est de préférence préparée dans une procédure à deux étapes, dans laquelle on fait d'abord réagir l'organosilane sous forme concentrée puis on le dilue. Une fois la solution de traitement appliqué sur le substrat transparent, par exemple par revêtement au trempé, le substrat couché est séché, de préférence par séchage éclair à température ambiante puis il est chauffé à une température élevée prédéterminée, dans une humidité fixée.

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