U.S. 7,868,066 B2 PPG Industries has been granted a patent for a coating comprised of a modified epoxy resin comprised of the reaction product of rosin and a dienophile comprised of a carboxylic group and/or an anhydride group, further reacted with an epoxy resin, the coating further comprised of a curing agent for the modified epoxy resin, wherein the coating is not a cationic electrodeposition coating. Source: coatingsworld
Source:
http://www.coatingsworld.com/issues/2012-04/view_patents/ppg-patents-aqueous-dispersion-and-coating/
