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BASF Coatings patents colloidally dispersed metallic bismuth coating

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Patent No. U.S. 7,781,054 B2

BASF Coatings GmbH has been granted a patent for a coating on a metallic substrate prepared from a thermally curable, organic-based aqueous coating material comprised of a colloidally dispersed metallic bismuth, present in an amount between from 0.01% to 2.5% by weight, based on total amount of the coating, and at least one alkanemonocarboxylic acid having at least 5 carbon atoms in the alkane and the alkane consists of the alkane, wherein the colloidally dispersed metallic bismuth is provided from at least one salt of bismuth that is present in an amount greater than an amount of the at least one alkanemonocarboxylic acid in the coating material and wherein the bismuth present in the coating provides heavy corrosion protection.

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