Patent ID: 6906163

Claim:
A process for the production of a polyurethane/urea in solution comprising a) reacting 1) a diisocyanate with 2) an isocyanate-reactive component comprising (i) a diol component comprising (a) from about 10 to about 100 equivalent percent of at least one polyoxypropylene diol having a number average molecular weight of at least about 1500 Da and an average unsaturation level less than or equal to 0.03 meq/g, (b) up to 90 equivalent percent of at least one polytetramethylene glycol having a number average molecular weight of at least 200 Da, and optionally, (ii) an isocyanate-reactive material which is different from 2)(i)(a) and 2)(i)(b), in the presence of 3) a catalyst which promotes linear polymerization but does not cause degradation of a polymer produced therewith under processing conditions, in amounts such that an NCO prepolymer having an NCO group content of from about 1.0 to about 3.75% will be formed, and b) chain extending the NCO prepolymer with 4) at least one aliphatic diamine chain extender in 5) a solvent to form the polyurethane/urea in solution.