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US 4,849,458 AGranted
Segmented polyether polyurethane
AssigneeMatrix Medica, Inc.
InventorsAndrew M. Reed, Ian N. Askill, Willis W. Weber
Life of this patent
Estimating the term…
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.
Claims10
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.
Dependencies are inferred from the claim text.