Water repellent surface treatment with acid activation
AssigneePPG Industries, Inc.
InventorGeorge B. Goodwin
Life of this patent
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Abstract
The present invention relates to improving the durability of water repellent films and a method for providing the film on a substrate. The water repellent film is preferably formed over the substrate by applying a water repellent composition over the substrate which will form the water repellent film. The durability of the water repellency of the film is improved by activating the substrate with an acid prior to forming the water repellent film over the substrate.
Claims24
A method for increasing the durability of a water repellent film formed on a surface of a substrate comprising the steps of:
- contacting the surface of the substrate with an acid solution selected from the group consisting of a hydrochloric acid solution, a sulfuric acid solution and a tartaric solution,
- removing the acid solution from the surface of the substrate to provide a surface that is free of said acid solution and residue of the acid solution, and
- forming on the acid-contacted surface of the substrate a water repellent film by applying a water repellent composite on the acid-contacted surface of said substrate wherein said hydrochloric acid solution has a concentration of approximately 0.5 to 30 wt % hydrochloric acid in deionized water, said sulfuric acid solution has a concentration of approximately 0.5 to 30 wt % sulfuric acid in deionized water, and said tartaric acid solution has a concentration of 1 to 40 wt % tartaric acid in deionized water.
A method for increasing the durability of a water repellent film formed on a surface of a substrate comprising the steps of;
- contacting the surface of the substrate with an acid solution;
- removing the acid solution from the surface of the substrate to provide a surface that is free of said acid solution and residue of said acid solution;
- and
- forming on the acid-contacted surface of the substrate a water repellent film wherein said forming step further comprises the step of applying a water repellent composition comprising a perfluoroalkylalkyl silane to the acid-contacted surface of the substrate.
A method for increasing the durability of a water repellent film formed on a surface of a substrate comprising the steps of:
- contacting the surface of the substrate with an acid solution;
- removing the acid solution from the surface of the substrate to provide a surface that is free of said acid solution and residue of said acid solution;
- and
- forming on the acid-contacted surface of the substrate a water repellent film,
- wherein said forming step further comprises the step of applying a water repellent composition to the acid-contacted surface of the substrate, said water repellent composition further comprising a primer, wherein said primer is integral with said water repellent composition.
A method for increasing the durability of a water repellent film formed on a surface of a substrate comprising the steps of:
- contacting the surface of the substrate with an acid solution:
- removing the acid solution from the surface of the substrate to provide a surface that is free of said acid solution and residue of said acid solution;
- applying a primer layer to the acid-contacted surface of said substrate forming over said primer layer a water repellent film.
A method for increasing the durability of a water repellent film formed on a surface of a substrate comprising the step of:
- contacting the surface of the substrate with an acid solution;
- removing the acid solution from the surface of the substrate to provide a surface that is free of said acid solution;
- and
- forming on the acid-contacted surface of the substrate a water repellent film, wherein said surface is selected from the group consisting of the surface of glass, metals, plastics, enamels and ceramics and
- said surface further includes an inorganic oxide coating over said surface said inorganic oxide coating selected from the group consisting of antimony-tin oxide, doped tin oxide and transition metal oxides.
Dependencies are inferred from the claim text.