Aqueous polyurethane-urea dispersions based on bis-(4-isocyanatocyclohexyl)-methane enriched in the trans,trans-isomer and coatings or films prepared therefrom

摘要

The present invention is directed to aqueous polyurethane-urea dispersions wherein the polyurethane-ureas are based on the reaction product ofa) an isocyanate component comprising bis-(4-isocyanatocyclohexyl)-methane having an average trans,trans isomer content of at least 35% by weight, based on the weight of bis-(4-isocyanatocyclohexyl)-methane withb) an isocyanate-reactive component.;The present invention is also directed to the films or coatings prepared from these aqueous polyurethane-urea dispersions.