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BASF Patents Superhydrophilic Coatings

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

U.S. 8,568,834 B2
BASF has been awarded a patent for a method for preparing a superhydrophilic layer comprised of one or more metal oxides on a substrate which method is comprised of (a) first coating the substrate with a cationic polymer, followed by (b) applying to the substrate coated by the cationic polymer a suspension, in a solvent, of amorphous particles of one or more metal oxides selected from the group consisting of oxides of silicon, zinc and titanium, wherein the particles have a particle diameter of from approximately 20 nm to 80 nm, to form a single layer film; (c) cross linking the thus obtained single layer film by applying a cross linking agent followed by drying to obtain a precursor film; and then (d) calcining the precursor film at temperatures ranging from 400° C to 600° C for 1 to 8 hours.

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