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Method for Hardening Powder Coatings



Published August 10, 2005
Patent No. U.S. 6,531,189 B1
E. I. du Pont de Nemours and Company has received a patent for a process for curing powder lacquer coatings. The process comprises applying a layer of the powder lacquer to a substrate and curing the layer of powder lacquer with near infrared radiation having a wavelength of 750-1200 nm (NIR radiation) to form a coating. The curing times and the surface temperatures of the substrate are controlled by the amount of additive content and the carbon black content of the powder lacquer and the powder lacquer contains one to 50% weight based on the weight of the powder lacquer, of an additive selected from the group consisting of aluminum oxide, barium sulfate and any mixtures thereof and 0.1 to five percent weight based on the weight of the powder lacquer, of carbon black.


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