Aqueous dispersions of fluorinated polyurethanes and their use for textile coatings
First Claim
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1. Stable aqueous dispersions of fluorinated polyurethanes containing in their macromolecules hydrophilic ionic groups, both of anionic and cationic character, obtained by the process comprising the steps:
- (a) preparing a fluorinated polyisocyanate, by reaction between an organic diisocyanate and a mixture comprising diols containing ionizable groups and macroglycols comprising polyols and at least 1% by weight of one or more hydroxy- and/or carboxy-capped fluoropolyoxyalkylene ethers;
(b) salifying the so-obtained fluorinated polyisocyanate, to convert the ionizable groups into hydrophilic cations or anions; and
(c) dispersing and chain extending the salified fluorinated polyisocyanate in water.
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Abstract
Aqueous dispersions of fluorinated polyurethanes obtained by the reaction of an organic diisocyanate with a mixture of diols containing ionizable groups and macroglycols comprising polyols and at least 1% by weight of one or more hydroxy- and/or carboxy-capped fluoropolyethers. Said fluorinated polyurethanes are salified, to transform the ionizable groups into hydrophilic cations and/or anions, and are then dispersed in water to be used in textile coatings.
39 Citations
13 Claims
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1. Stable aqueous dispersions of fluorinated polyurethanes containing in their macromolecules hydrophilic ionic groups, both of anionic and cationic character, obtained by the process comprising the steps:
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(a) preparing a fluorinated polyisocyanate, by reaction between an organic diisocyanate and a mixture comprising diols containing ionizable groups and macroglycols comprising polyols and at least 1% by weight of one or more hydroxy- and/or carboxy-capped fluoropolyoxyalkylene ethers; (b) salifying the so-obtained fluorinated polyisocyanate, to convert the ionizable groups into hydrophilic cations or anions; and (c) dispersing and chain extending the salified fluorinated polyisocyanate in water. - View Dependent Claims (2, 3, 4, 5, 6, 7, 12, 13)
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8. Stable aqueous dispersions of fluorinated polyurethanes containing in their macromolecule hydrophilic ionic groups, of either anionic or cationic nature, obtained by the process comprising the following steps:
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(i) preparing a fluorinated polyisocyanate prepolymer by reacting an organic diisocyanate with a mixture comprising diols containing ionizable groups and macroglycols comprising polyols and at least 1% by weight one or more hydroxy- and/or carboxy-capped fluoropolyoxyalkylene ethers; (ii) converting of the fluorinated polyisocyanic prepolymer into an oligo-urethane having unsaturated vinyl end groups, by reacting a compound containing hydroxyl reactive with the isocyanate groups selected from the class consisting of hydroxy-alkyl-acrylates or -methacrylates having the formula;
##STR4## wherein R2 is hydrogen or a (C1 -C4)-alkyl radical and W is a hydroxyalkyl radical;(iii) salifying of the so-obtained oligo-urethane to convert the ionizable groups into hydrophilic cations or anions; (iv) dispersing the salified oligo-urethane in water; and (v) polymerizing the unsaturated end groups of said oligo-urethane dispersed in water. - View Dependent Claims (9, 10, 11)
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Specification