Aqueously dispersed blends of epoxy resins and blocked urethane prepolymers

摘要

The present invention is directed to an aqueously dispersed, ambient temperature curable composition containing (a) an epoxy resin which is rendered water-dispersible by chemically incorporated emulsifiers and/or by being admixed with external emulsifiers and (b) an isocyanate-terminated prepolymer (i) which is rendered water-dispersible by chemically incorporated emulsifiers and/or by being admixed with external emulsifiers, (ii) which is prepared from a mixture containing a polyisocyanate and a compound having a molecular weight of at least 500 and at least two hydroxyl groups and (iii) wherein the isocyanate groups are blocked with a phenolic compound. The present invention is also directed to a process for preparing polyurethanes by reacting the above blends with polyamines at ambient or elevated temperature and to the polyurethanes produced therefrom.