Fluorine-free waterproofing

Fluorine-free cationic polyurethane dispersions to improve the water-repellent effects and permanence of fluorine-free water repellents for textile surfaces. The invention describes the preparation and use of a cationic, fluorine-free polyurethane dispersion is applied to textile fabrics, woven fabrics, scrims, knitted fabrics, fibers, non-woven and knitted fabrics, as well as leather, to enhance the permanence and water-repellent effect of conventional fluorine-free water repellents significant.