| abstract |
Aqueous polyurethane dispersions useful as coating compositions wherein the polyurethane comprises the reaction product ofn a) an isocyanate-terminated polyurethane prepolymer containing carboxylic acid salt groups formed by reacting:n (i) a polyisocyanate component containing at least l% by weight of diphenylmethane-2,4′-diisocyanate, and (ii) an active hydrogen containing component containing a polyol and a carboxy group containing diol or triol, b) an active hydrogen containing chain extender. |