copolymers of at least two acrylate monomers such as isobutyl methacrylate and 2 - ethylhexyl acrylate , an organic acid or acid anhydride , and n - vinyl - 2 - pyrrolidone are prepared by emulsion polymerization . the polymer is then coagulated and dried , and dry resin is mixed with a water miscible coalescing solvent and a volatile amine . the amine - treated resin is water reducible and when used as a coating resin produces coatings of unusual water resistance and adhesion to metal surfaces .