公开(公告)号：DE3903538A1

公开(公告)日：1990-08-16

申请号：DE3903538

申请日：1989-02-07

Applicant: BASF AG

Inventor： FISCH HERBERT DR ,  MAEMPEL LOTHAR DR ,  VOLKERT OTTO DR

IPC: C08G18/08 ,  C08G18/10 ,  C08L61/10 ,  C09J175/04

Abstract: Emulsifier-free aqueous polyurethane dispersions are prepared by reacting (a) dihydroxy compounds, (b) diisocyanates and (c) chain extenders to give a prepolymer having terminal isocyanate groups, then reacting the prepolymer with (d) salts of aliphatic aminocarboxylic or -sulfonic acids or amino-containing or hydroxyl-containing tertiary ammonium salts, dispersing the resulting polyurethane in water and, if required, removing the organic solvent by distillation. In the process, an organic condensation resin which is dissolved in a solvent is admixed before the polyurethane obtained is dispersed in water.