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DuPont patents low temp curable melamine coating

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

U.S. 8,114,481 B2
E.I. du Pont de Nemours and Company has been awarded a patent for a process for producing a coating on a substrate. The process is comprised of the steps of:
(A) mixing components of a coating composition to form a pot mix, wherein the coating composition consists of: i) a crosslinkable component consisting of 15% to 99% weight of total solid weight of the crosslinkable component a polyester having hydroxyl crosslinkable groups and a weight average molecular weight in a range of 1,500 to 100,000, and 1% to 35% weight of total solid weight of the crosslinkable component a melamine having crosslinkable groups selected from an —NH group, a hydroxyl group, or a combination thereof; and ii) a crosslinking component consisting of a polyisocyanate compound having two or more isocyanate groups that react with the crosslinkable groups at temperatures in a range of from 40° F (4° C) to 200° F (93° C); iii) one or more pigments or effect pigments; and iv) one or more additives selected from conductive additives, viscosity adjuster, catalyst, one or more solvents, or a combination thereof; wherein the coating composition is formulated as a primer, or a color matched primer; (B) applying the pot mix over the substrate to form a layer; and (C) curing the layer on the substrate to form the coating.

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