Process for the preparation of polyurethanes which are dispersible in water
First Claim
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1. A process for the preparation of water dispersible, substantially linear polyurethanes characterized by a content of from 0.5 to 10%, by weight, of ethylene oxide units built into terminal polyether chains and from 0.1 to 15 milliequivalents of ionic groups per 100 grams of polyurethane, said process comprising reacting:
- (a) an organic diisocyanate,(b) an organic compound, which behaves as a difunctional material in the reaction with the diisocyanate and which contains isocyanate reactive hydrogen atoms,(c) a first hydrophilic material selected from the group consisting of(i) monoisocyanates which contain hydrophilic chains containing ethylene oxide (i.e., --CH2 --CH2 --O--) units,(ii) compounds which are monofunctional in the isocyanate polyaddition reaction, which contain isocyanate reactive hydrogen atoms, and which contain ethylene oxide units, and(iii) mixtures thereof, and(d) a second hydrophilic material selected from the group consisting of(i) mono- and/or diisocyanates which contain ionic groups and/or groups capable of conversion into ionic groups,(ii) compounds which are mono- and/or difunctional in the isocyanate polyaddition reaction, which contain isocyanate reactive hydrogen atoms and which contain ionic groups and/or groups capable of conversion into ionic groups.
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Abstract
The instant invention is directed to novel polyurethanes which have a substantially linear molecular structure and which are dispersible in water, and the method of producing such polyurethanes. The polyurethanes of the present invention are characterized by an ethylene oxide unit content of from 0.5 to 10%, by weight, and by an ionic content of from 0.1 to 15 milliequivalents per 100 grams of polyurethane.
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10 Claims
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1. A process for the preparation of water dispersible, substantially linear polyurethanes characterized by a content of from 0.5 to 10%, by weight, of ethylene oxide units built into terminal polyether chains and from 0.1 to 15 milliequivalents of ionic groups per 100 grams of polyurethane, said process comprising reacting:
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(a) an organic diisocyanate, (b) an organic compound, which behaves as a difunctional material in the reaction with the diisocyanate and which contains isocyanate reactive hydrogen atoms, (c) a first hydrophilic material selected from the group consisting of (i) monoisocyanates which contain hydrophilic chains containing ethylene oxide (i.e., --CH2 --CH2 --O--) units, (ii) compounds which are monofunctional in the isocyanate polyaddition reaction, which contain isocyanate reactive hydrogen atoms, and which contain ethylene oxide units, and (iii) mixtures thereof, and (d) a second hydrophilic material selected from the group consisting of (i) mono- and/or diisocyanates which contain ionic groups and/or groups capable of conversion into ionic groups, (ii) compounds which are mono- and/or difunctional in the isocyanate polyaddition reaction, which contain isocyanate reactive hydrogen atoms and which contain ionic groups and/or groups capable of conversion into ionic groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Polyurethanes having a substantially linear molecular structure and being dispersible in water, characterized by
(a) polyalkylene oxide polyether end chains containing from 0.5 to 10%, by weight, of ethylene oxide units based on the total quantity of polyurethane, and (b) from 0.1 to 15 milliequivalents of ═ - N═
.sup.⊕
, ═
S--.sup.⊕
,--COO.sup.⊖
or --SO3.sup.⊖
groups per 100 grams. - View Dependent Claims (10)
- N═
Specification