Preparation of emulsifier-free aqueous polyurethane dispersions

Details Preparation of emulsifier-free aqueous polyurethane dispersions Preparation of emulsifier-free aqueous polyurethane dispersions

C - Chemistry, Metallurgy

08

L

400/5418

C08L 61/06 (2006.01) C08G 18/08 (2006.01) C08L 75/04 (2006.01) C09J 175/04 (2006.01)

Patent

CA 2008369

O.Z. 0050/40562 Abstract of the Disclosure: 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 dis- tillation. In the process, an organic condensation resin which is dissolved in a solvent is admixed before the polyurethane obtained is dispersed in water.

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