Abstract: A composite membrane for separating a gas from a mixed gas stream includes a fibrous non-woven substrate including consolidated synthetic thermoplastic fibers, and coextensively disposed on a surface of the fibrous non-woven substrate a continuous polysulfide rubber film adhered thereto. A method of separating a gas component from a mixed gas stream includes 1) contacting a surface of the above-described composite membrane with the mixed gas stream under conditions such that a product gas enriched in the gas component diffuses through the composite membrane; and 2) collecting the product gas.

Abstract: A composite membrane for separating a gas from a mixed gas stream includes a fibrous non-woven substrate including consolidated synthetic thermoplastic fibers, and coextensively disposed on a surface of the fibrous non-woven substrate a continuous polysulfide rubber film adhered thereto. A method of separating a gas component from a mixed gas stream includes 1) contacting a surface of the above-described composite membrane with the mixed gas stream under conditions such that a product gas enriched in the gas component diffuses through the composite membrane; and 2) collecting the product gas.

Abstract: A method for generating a waterproof, vapor-permeable fabric, wherein a coating liquid is applied to a fabric. The coating liquid comprises a solvent medium and a polyvinylacetal which is an acid-catalyzed reaction product of polyvinyl alcohol and one or more aldehydes, ketones or combinations thereof, wherein each aldehyde contains 1 to 18 carbon atoms and each ketone contains 3 to 16 carbon atoms, and wherein about 1% to about 40% of hydroxyl groups on the polyvinyl alcohol are converted to acetal structures. Once the coating liquid is applied, the solvent medium is removed to form the coated fabric.