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BASF Coatings patents process for coating electrically conductive substratetes

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

US 7,862,851 B2
BASF Coatings AG has been granted a patent for a process for coating electrically conductive substrates by applying at least one electrocoat material to an electrically conductive substrate and curing it to give an electrocoat and subsequently applying at least one layer of at least one pulverulent coating material to the electrocoat and curing it to give a powder coat or alternatively applying at least one electrocoat material to an electrically conductive substrate and drying it without fully curing it to provide a dried electrocoat film, applying at least one layer of at least one pulverulent coating material to the dried electrocoat film and jointly curing the dried electrocoat film and layer of the pulverulent coating material to give an electrocoat and a powder coat, wherein the pulverulent coating material is comprised of  at least one epoxy resin having at least one of a melting point, melting range or glass transition temperature that is greater than 30° C, at least one carboxyl-containing polyester resin having at least one of a melting point, melting range or glass transition temperature that is greater than 30° C, and at least one polycarboxylic acid having a melting point of between 80° and 160° C.

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