Patent ID: 8420765

Claim:
A spandex comprising polyurethaneurea comprising a reaction product of: (a) a poly(tetramethylene-co-ethyleneether) glycol comprising constituent units derived by copolymerizing tetrahydrofuran and ethylene oxide wherein the portion of the units derived from ethylene oxide is present in the poly(tetramethylene-co-ethyleneether) glycol from about 48 to about 70 mole percent; (b) a polymeric glycol selected from the group consisting of a poly(tetramethylene ether) glycol, a poly(tetramethylene-co-2-methyltetramethyleneether) glycol, a poly(ethylene ether) glycol, a poly(propylene ether) glycol, a polycarbonate glycol, a polyester glycol, and a combination thereof; (c) at least one diisocyanate; (d) at least one diamine chain extender; and wherein the poly(tetramethylene-co-ethyleneether) glycol and polymeric glycol each has a molecular weight between about 650 Dalton and about 4000 Dalton.