| abstract |
A method for making an aqueous polyurethane-vinyl polymer dispersion which comprises: n (a) forming a carboxy-containing, water-dispersible, isocyanate terminated polyurethane prepolymer, n (b) adding a vinyl monomer composition which includes a polyethylenically unsaturated monomer to the prepolymer to form a prepolymer/monomer mixture, n (c) adding a tertiary amine to the prepolymer/monomer mixture, n (d) dispersing the prepolymer/monomer mixture in water, n (e) adding an oil soluble free radical initiator and a chain-extender to the aqueous dispersion, and n (f) polymerizing the vinyl monomer and completing chain extension of the prepolymer by heating the aqueous dispersion. |