Lösemittelfreie Polyurethan-Dispersion

摘要

The invention relates to a solvent-free polyurethane dispersion having a high solids content of polyurethane polymer or fillers. Said dispersion can be obtained by; a) reacting a high-molecular polyol component (A) (i) with a polyisocyanate component (B) to produce a polyurethane preadduct; b) afterwards, the polyurethane preadduct from step a) is reacted with a low-molecular and anionically modifiable polyol component (A) (iii) having two or more hydroxyl groups and one or more carboxyl groups in order to produce the corresponding prepolymer; c) reacting the prepolymer from step b) with a neutralizing component (C) in order to completely or partially neutralize the carboxyl groups; d) afterwards or simultaneously dispersing the neutralized prepolymer from step c) in water and finally; e) reacting the dispersion from step d) with a chain extending component (D).