Preparation of emulsifier-free aqueous polyurethane dispersions

US5055516A · kind A · utility

Assignee

• BASF SE

Inventors

• Herbert Fisch · Monsheim, DE
• Lothar Maempel · Zeven, DE
• Otto Volkert · Bad Dürkheim, DE

Key dates

• Filing date: Jan 8, 1990
• Grant date: Oct 8, 1991
• Expiry date: Jan 8, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2666/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.