Waterborne one component non-isocyanate polyurethane epoxy hybrid coatings

A method of preparing a composition for a one-package (1 K) waterborne non-isocyanate polyurethane epoxy hybrid coating, the method comprising steps of

• combining a cyclic carbonate with one or more of 3,3′-diamino-N-methyldipropylamine (DMDPA) and norspermidine as an internal emulsifier and a diamine to thereby obtain a non-isocyanate polyurethane (NIPU) prepolymer, where the internal emulsifier also provides hard segments to an eventual neutralized NIPU polymer;
• subjecting the NIPU prepolymer to chain extension by combining the NIPU prepolymer with an epoxy resin, to thereby obtain a chain extended NIPU polymer;
• subjecting the chain extended NIPU polymer to neutralization by combining the chain extended NIPU polymer with a neutralizing agent, to thereby obtain the neutralized NIPU polymer;
• and
• dispersing the neutralized NIPU polymer in water to thereby provide a waterborne NIPU liquid dispersion as a one-package (1 K) composition.