Polyurethane synthesis from functional group terminated polymers containing sulfonate groups
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United States of America Patent
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Dec 26, 2000
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N/A
app pub date -
Dec 18, 1996
filing date -
Dec 18, 1996
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Expired
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Abstract
Disclosed is a process for producing water-dispersible polyurethanes by forming an isocyanate-di-substituted prepolymer and reacting it with a chain extender. The prepolymer can be formed by reacting a diisocyanate with an ethylenically unsaturated precursor which is preferably formed by condensation polymerization of reactants including ethylenically unsaturated reactants and then sulfonating the ethylenic unsaturation of said polymeric precursor by reacting it with a sulfonating agent such as bisulfite, metabisulfite, or a mixture thereof.
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