| abstract |
The present invention is an aqueous polyurethane dispersion U comprising at least two water-dispersible polyurethanes, wherein at least one of the water-dispersible polyurethanes is a water-dispersible polyurethane U1 having a mass average molar mass M w1 of at least 10 kg/mol. , To an aqueous polyurethane dispersion U , wherein at least one is a water-dispersible polyurethane U2 having a mass average molar mass M w2 of less than 10 kg/mol, a method of preparing them, and a method of using them. |