초록 ▼

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 c

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.

대표청구항 ▼

1. A process for applying an anti-stain, hydrophobic optical coating to a transparent substrate, comprising the steps of: preparing a first solution consisting essentially of organosilane, alcohol, water, and an acidic catalyst, wherein the organosilane is described by the following formula: (RO)3-

1. A process for applying an anti-stain, hydrophobic optical coating to a transparent substrate, comprising the steps of: preparing a first solution consisting essentially of organosilane, alcohol, water, and an acidic catalyst, wherein the organosilane is described by the following formula: (RO)3-n-Si-{(Cp+qH2pF2q)-(CH3 or -CF3)}1+n wherein: n is 0-3, p+q≥2, and R is an alkyl group; allowing the first solution to react; mixing the first solution with a second solution that comprises water, to produce a treatment solution; applying the treatment solution to a surface of a transparent substrate; and drying the coated substrate.