Aqueous two-part isocyanate-free curable, polyurethane resin systems

摘要

Aqueous-borne coating compositions containing: (A) an acetoacetylated polymer; and (B) a polyacrylate having at least two (meth)acrylate end groups, have long pot lives and may be cured by the evaporation of water in the presence of a basic catalyst. Acrylic copolymers having pendent urethane side groups which are terminated with (meth)acrylate groups are water-dispersible and may be cured with polyfunctional crosslinking agents or by free radical initiators to afford coatings having excellent properties. Incorporation of a crosslinking component containing epoxy groups improves the coating properties.