| abstract |
(57) Abstract: The present invention relates to a membrane (28) comprising urethane containing a polyester polyol, wherein the gas permeability of the membrane (28) is about 20.0 mil, In the case of gas, it is 15.0 or less. Under certain embodiments, the membrane (28) comprises a mixture of one or more thermoplastic urethanes based on a polyester polyol and one or more barrier materials. The membrane can be used for a variety of applications, and can be used as either a single layer (30A) or a multilayer stack (28A). |