Amino-terminated and carboxyl-containing polyurethane (PU) is prepared by in isocyanate-terminated PU prepolymer process. Carboxyl-containing epoxy resin is obtained from a half-esterification of epoxy resin with maleic anhydride. These two aqueous resins are obtained after neutralisation with triethylamine and dispersion into water phase, respectively. A latent curing agent (TMPTA-AZ) is prepared by a Michael addition of aziridine with trimethylolpropane triacrylate (TMPTA). A self-curing system of PU/epoxy hybrid is obtained from a blending of these two aqueous resins with latent curing agent. PU/epoxy hybrid is derived front two self-curing reactions oil drying. The first Curing for hybridization between PU amino groups with oxirane groups Of epoxy resin is via a ring-opening reaction and the secondary curing takes place oil carboxyl groups of PU/epoxy hybrid with aziridine of TMPTA-AZ. The final properties of these dual self-cured PU/epoxy hybrids are reported. (C) 2008 Wiley Periodicals, Inc.