PPG patents electroconductive

November 17, 2006

Patent No. U.S. 7, 070,683 B2
PPG Industries has been granted a patent for a process for coating an electroconductive substrate. It is comprised of electrophoretically depositing on the substrate a curable electrodepositable coating composition to form an electrodeposited coating over at least a portion of the substrate, the electrodepositable coating composition comprising a resinous phase dispersed in an aqueous medium, the resinous phase is comprised of one or more ungelled, active hydrogen-containing cationic salt group-containing resins which are electrodepositable on a cathode; one or more at least partially blocked polyisocyanate curing agents; at least one substantially non-volatile antioxidant; at least one volatile antioxidant; and heating the coated substrate in a curing oven at a temperature and for a time sufficient to cure the electrodeposited coating on the substrate.