Stable, aqueous dispersions of polyurethane-ureas
AssigneeMobay Chemical Corporation
InventorsPeter H. Markusch, James W. Rosthauser, Michael C. Beatty
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Abstract
The present invention relates to a stable, aqueous dispersion of polyurethane-ureas wherein said polyurethane-ureas contain (i) about 10 to 120 milliequivalents per 100 grams of polyurethane-urea of chemically incorporated anionic groups, and (ii) up to about 10% by weight, based on the weight of the polyurethane-urea, of lateral and/or terminal hydrophilic chains containing ethylene oxide units, wherein the counterions of the anionic groups are a mixture of volatile and non-volatile cations in an equivalent ratio of about 1:4 to 4:1. The present invention is also directed to the coatings and films prepared from these dispersions.
Claims17
A stable, aqueous dispersion of polyurethane-ureas wherein said polyurethane-ureas contain
- (i) about 10 to 120 milliequivalents per 100 grams of said polyurethane-ureas of chemically incorporated anionic groups, and
- (ii) up to about 10% by weight, based on the weight of said polyurethane-ureas, of lateral and/or terminal hydrophilic chains, containing ethylene oxide units, wherein the counterions of said anionic groups are a mixture of volatile and nonvolatile cations in an equivalent ratio of about 1:4 to 4:1.
A stable, aqueous dispersion of polyurethane-ureas wherein
- (a) said polyurethane-ureas contain
- (i) about 10 to 60 milliequivalents per 100 grams of said polyurethane-ureas of chemically incorporated sulfonate and/or carboxylate anionic groups, and
- (ii) about 1 to 6% by weight, based on the weight of said polyurethane-ureas, of lateral and/or terminal hydrophilic chains containing ethylene oxide units;
- (b) said polyurethane-ureas are prepared by a process which comprises initially forming an isocyanate-terminated prepolymer containing aliphatically- and/or cycloaliphatically-bound, terminal isocyanate groups and subsequently forming said polyurethane-ureas by chain extending said prepolymer with a polyfunctional amine having an average functionality between about 2 and 3;
- and
- (c) the counterions of said anionic groups are a mixture of volatile tertiary amines and alkali metals in an equivalent ratio of about 1:4 to 4:1.
Dependencies are inferred from the claim text.