Patent ID: 6737497
Filing Date: 2004-05-18
Classification: C08G,D01F,Y10S

Abstract:
A segmented polyurethane/urea produced by reacting in solution:a) an isocyanate-terminated prepolymer having a free isocyanate group content of from about 1 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) from about 10 equivalent percent to about 70 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 0.03 meq/g, and (b) from about 30 equivalent percent to about 90 equivalent percent of at least one polytetramethylene ether glycol having a molecular weight of from about 600 Da to about 6000 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 percents of (i) and (ii) is 100 equivalent percent, with b) a diamine chain extender comprising: (1) from about 7 to about 25 equivalent percent, based on total equivalents of b), of at least one asymmetric aliphatic and/or cycloaliphatic diamine and (2) at least one linear diamine in the presence of c) a solvent.