Aqueous polyurethane polyurea dispersions

Aqueous polyurethane-polyurea dispersion comprises building components of (a) polyisocyanate, (b) polyols with number average molecular weight of 200-8000 g/mol, (c) low molecular compounds having molecular weight of 62-400 having two or more hydroxy and/or amino groups, (d) compounds having a hydroxy or amino group, (e) an isocyanate reactive, ionic or potentially ionic hydrophilizing compound, where the content of ionic or potentially ionic groups amounts to 1-200 mEq/100 g of solid resin, and (f) an isocyanate-reactive, non-ionic hydrophilizing compound. Aqueous polyurethane-polyurea dispersion comprises building components of (a) polyisocyanate, (b) polyols with number average molecular weight of 200-8000 g/mol, (c) low molecular compounds having molecular weight of 62-400 having two or more hydroxy and/or amino groups, (d) compounds having a hydroxy or amino group, (e) an isocyanate reactive, ionic or potentially ionic hydrophilizing compound, where the content of ionic or potentially ionic groups amounts to 1-200 mEq/100 g of solid resin or (f) an isocyanate-reactive, non-ionic hydrophilizing compound. The polyurethane-polyurea dispersion lies within a monomodal particle size distribution of maximum 10-400 nm. The particle size of the polyurethane particle is 1-1500 nm. An independent claim is also included for preparing the aqueous polyurethane-polyurea dispersions, comprising (i) producing an urea group free isocyanate functional pre-polymer by partial or complete conversion of (a), (b), (c1) low molecular compound having molecular weight of 62-400 having two or more hydroxyl group, (c2) compounds having one hydroxyl group, (e) and (f) optionally in an organic solvent, (ii) dissolving the isocyanate pre-polymer in an organic solvent, when it is not added in the first step, (iii) optionally adding compound (c) and (d) and subsequently carrying out the dispersion by the addition of water under simultaneous distillation of organic solvent, where the amount of dosing of dispersing water is equal to the amount of organic solvent that is distilled out. Die Erfindung betrifft neue wässrige Polyurethanpolyharnstoff-Dispersionen mit monomodaler Teilchengrößenverteilung, ein Verfahren zu deren Herstellung und deren Verwendung zur Herstellung von Beschichtungsmitteln.