Repellent coatings for optical surfaces

Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition – Control element responds proportionally to a variable signal...

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427163, 427164, 427165, 427169, C03C 1730, G02B 110

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active

044105630

ABSTRACT:
Water repellent coatings for optical elements such as lenses and windshields. Coatings for uncoated glass, glass having a magnesium fluoride antireflective coating, and glass having an electrically conductive coating of a mixture of indium oxides and tin oxides are applied by applying compositions containing chloromethylsilanes, Dow Corning 531 and 536 fluids, or N, beta-aminoethyl-gamma-aminopropyltrimethylsilane and a perfluorocarboxylic acid to the surface where water repellent coatings are desired. Dow Corning 531 and 536 fluids are described as aminofunctional polydimethylsiloxane copolymers. Hydrolysis and condensation reactions in the presence of water at the surface to be coated result in a durable polymeric coating bonded to the surface.

REFERENCES:
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patent: 3592669 (1971-07-01), Baker et al.
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Information About Polish Ingredients, Bulletin 22-240A-78, Dow Corning Co, Midland, Michigan, (1978).
New Product Information, Dow Corning 531 Fluid, Bulletin 22-763-80, Dow Corning Corp., Midland, Michigan, (1980).

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