Preparation of emulsifier-free aqueous polyurethane dispersions

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

1990-01-08

1991-10-08

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524591, 523415, C08L 6300, C08J 0000

Patent

active

050555162

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.

REFERENCES:
Polyurethane, Kunststoff-Handbuch, vol. 7, Jul. 1983, pp. 588-590, Dr. Gunter Oertel.
Die Angewandte Makromolekulare Chemie, vol. 98, (1981), pp. 133-165, D. Dietrich.
Progress in Organic Coatings, vol. 9, (1981), pp. 281-340, D. Dietrich.

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