Waterborne Polyurethane Paints and Varnishes for Metal Surfaces: Patent Review

Patent literature of the past 15 years dealing with waterborne coatings used for painting metal surfaces was reviewed. Based on the physicomechanical testing results reported in the patents surveyed, a comparative analysis of the physicomechanical characteristics of the waterborne coating materials proposed was carried out, current trends in their development were identified, and a conclusion concerning the most promising development directions in this area was made. Selected for survey were patents relating to metal coatings with good resistance to corrosion and aggressive external factors.