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PPG patents method of reducing mapping of an electrodepositable coating layer

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Patent No. U.S. 2,010,316,881
PPG has received a patent related to the method of reducing mapping of an electrodepositable coating layer. It concerns a method for coating a substrate with a variety of coating compositions thereby reducing mapping of a coating composition deposited onto the substrate. In certain embodiments, the present invention is directed to the deposition of a zirconium-based pretreatment composition onto a substrate with the subsequent deposition of an electrodepositable coating composition, which comprises a soluble alkaline earth metal ion, onto the pretreatment composition. The present invention is also directed to a coating system comprising various layers deposited from the coating compositions disclosed herein.

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