Segmented polyether polyurethane
First Claim
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1. A hydrophilic but water-insoluble, segmented polyether polyurethane-urea having a wet strength greater than dry strength and capable of forming a visually clear film;
- said polyurethane-urea being the reaction product of a prepolymer derived from a stoichiometric excess of a diisocyanate reacted with an admixture of polyalkylene ether glycols each having different-length alkyleneoxy segments, and extended with a difunctional amine chain extender.
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Abstract
A hydrophilic, segmented polyether polyurethane-urea that exhibits an increase in tensile strength and elongation when wet with water and is capable of forming visually clear films permeable to water vapor is disclosed.
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10 Claims
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1. A hydrophilic but water-insoluble, segmented polyether polyurethane-urea having a wet strength greater than dry strength and capable of forming a visually clear film;
- said polyurethane-urea being the reaction product of a prepolymer derived from a stoichiometric excess of a diisocyanate reacted with an admixture of polyalkylene ether glycols each having different-length alkyleneoxy segments, and extended with a difunctional amine chain extender.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
Specification