Kansai Paint Co. has been granted a patent for an aqueous coating resin composition comprised of a water-dispersible nonionic resin (A) and a water-dispersible anionic core-shell resin (B), characterized in that the water-dispersible nonionic resin (A) contains a polyoxyalkylene group-containing polymerizable unsaturated monomer (a1) at 5%-50% mass of the total polymerizable unsaturated monomer used for production of the resin (A) wherein the resin contains no ionic functional groups and contains both a polymerizable unsaturated monomer with a C4 and greater hydrocarbon group and a hydroxyl-containing polymerizable unsaturated monomer as copolymerizable components, and the water-dispersible anionic core-shell resin (B) contains an anionic group in the resin.
Source:
http://www.coatingsworld.com/issues/2013-05/view_patents/kansai-paint-patents-aqueous-coating-resin/