Process for the preparation of aqueous Polyurethane-polyurea dispersion

Abstract

The present invention relates to aqueous polyurethane-polyurea dispersions which stabilise a foam - produced by mechanical expansion - without addition of further foam- stabilising components in such a way that aqueous foams are obtainable which are stable both during temporary storage and during processing, so that they can be applied in the form of foam also by customary application methods and substantially retain the foam structure even after drying.