STABLE, AQUEOUS DISPERSIONS OF POLYURETHANE-UREAS AND COATINGS AND FILMS PREPARED THEREFROM

摘要

STABLE, AQUEOUS DISPERSIONS OF POLYURETHANE-UREAS AND COATINGS AND FILMS THEREFROM The present invention relates to a stable, aqueous dispersion of polyurethane-ureas wherein said polyurethane-ureas contain i) about 2 to 200 milliequivalents per 100 grams of polyurethane-urea of chemically incorporated anionic groups, and ii) up to about 15% by weight, based on the weight of the polyurethane-urea, of lateral and/or terminal hydrophilic chains containing ethylene oxide units, wherein the counterions of the anionic groups are a mixture of volatile and non-volatile cations in an equivalent ratio of about 1:10 to 10:1. The present invention is also directed to the coatings and films prepared from these dispersions.