Cationic electrolyte-stable dispersions and process for producing polyurethanes useful therein
AssigneeBayer Aktiengesellschaft
InventorsPeter Markusch, Klaus Noll, Dieter Dieterich
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Abstract
The instant invention is directed to novel polyurethane cationic electrolyte-stable dispersions characterized by lateral or terminal polyalkylene oxide polyether chains containing from 2 to 10%, by weight, of ethylene oxide units, based on the total weight of the polyurethane; a content of ##STR1## groups of from 16 to 100 milliequivalents per 100 g of polyurethane; an average particle size of from 50 to 300 m.mu.; and a solids content of from 10 to 45%.
Claims7
Electrolyte-stable aqueous dispersions of polyurethane cationomers, characterized by:
- (a) lateral or terminal polyalkylene oxide polyether chains containing from 2 to 10%, by weight, of ethylene oxide units, based on the total weight of the polyurethane;
- (b) a content of ##STR9## groups of from 16 to 100 milliequivalents per 100 g of polyurethane;
- (c) an average particle size of from 50 to 300 m.mu.;
- and
- (d) a solids content of from 10 to 45%.
A process for the preparation of water-dispersible polyurethanes having a content of from 2 to 10%, by weight, of laterally or terminally incorporated ethylene oxide units and from 16 to 100 milliequivalents of cationic groups per 100 g of polyurethane, said process comprising reacting
- (a) an organic diisocyanate,
- (b) an organic compound which is difunctional in the isocyanate-polyaddition and which contains terminal isocyanate-reactive hydrogen atoms,
- (c) a first hydrophilic material selected from the group consisting of
- (i) diisocyanates which contain lateral hydrophilic chains containing ethylene oxide (i.e., --CH.sub.2 --CH.sub.2 --O--) units,
- (ii) compounds which are difunctional in the isocyanate-polyaddition reaction, which contain isocyanate reactive hydrogen atoms and which contain lateral hydrophilic chains containing ethylene oxide units,
- (iii) monoisocyanates having hydrophilic chains containing ethylene oxide units,
- (iv) compounds which are monofunctional in the isocyanate-polyaddition reaction, which contain isocyanate-reactive hydrogen atoms, and which contain hydrophilic chains containing ethylene oxide units, and
- (v) mixtures thereof, and
- (d) a second hydrophilic material selected from the group consisting of
- (i) mono- and/or diisocyanate which contain cationic groups or groups convertible thereto,
- (ii) compounds which are mono- and/or difunctional in the isocyanate polyaddition reaction, which contain isocyanate-reactive hydrogen atoms and which contain cationic groups or groups convertible thereto.
Dependencies are inferred from the claim text.