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DuPont Patents High Solids Coatings

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

U.S. 8,197,905 B2
E I du Pont de Nemours and Co. has been granted a patent for a process which is comprised of applying a solvent-based coating having a low content of VOCs of 2.1 lbs/gal and below on a substrate to obtain a clear coating layer of a multi-layer coating, the solvent-based coating is comprised of a binder component and a crosslinking component, wherein the binder component is comprised of at least one hydroxy-functional polyether having at least two secondary hydroxyl groups per molecule, a number average molecular weight Mn in the range of 200-5,000 and a polydispersity of <2, the polyether is obtained from at least one polyol having at least three hydroxyl groups and at least one monoglycidyl ester of a branched monocarboxylic acid, having 5 carbon atoms in the molecule, and the crosslinking component is comprised of at least one cross-linking agent which is capable of entering into a crosslinking reaction with the hydroxyl groups of the hydroxy-functional polyether, the binder component consists of 80%-100% by weight of the one hydroxy-functional 0%-20% by weight of at least one additional hydroxyl-functional binder that is different from the hydroxyl-functional polyether and curing the multi-layer coating.

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