Aqueous polymer emulsion-polyester polyol blend for reducing or eliminating flooding and floating in water-based two component polyurethane coatings

摘要

A substantially solvent free, aqueous, pigmented, two component polyurethane-polyurea dispersion comprising:;(a) an aqueous mixture of an acid-containing polymeric polyol and a polyol free of acid groups, wherein the mixture has an average hydroxyl functionality of at least 1.5 and an acid number between about 15 and 200; and;an amine or a blend of amines having an average active hydrogen functionality of at least 1.5, the amine or blend of amines being present in a sufficient amount to substantially neutralize the acid-containing polymeric polyol;;(b) one or more polyisocyanates; and;(c) two or more different pigments;;characterized by reducing or eliminating flooding of the pigments with;(d) an aqueous polymer emulsion present in an amount sufficient to impart thixotropy to the mixture of (a) and (d).