Patent ID: 6903179

Claim:
A segmented polyurethane/urea produced by reacting in solution: a) an isocyanato-terminated prepolymer having a free isocyanate group content of from about 1.0 to about 3.75% which is the reaction product of (1) a stoichiometric excess of at least one diisocyanate with (2) an isocyanate-reactive component comprising: (i) a diol component which comprises (a) at least 50 equivalent percent of at least one polyoxypropylene diol having a molecular weight of at least 1500 Da and an average unsaturation level less than or equal to 0.015 meq/g, and (b) up to 50 equivalent percent of at least one polytetramethylene ether glycol having a molecular weight of at least about 600 Da and, optionally, (ii) one or more other materials containing at least one functional group that is reactive with an isocyanate group, provided that the sum of the equivalent weight percents of (i) and (ii) is 100 equivalent percent, with b) a chain extender comprising at least one asymmetric aliphatic and/or cycloaliphatic diamine and at least one linear diamine in the presence of c) a solvent.