Patent ID: 9126153
Filing Date: 2015-09-08
Classification: B01D,C08J,C10L,E04B,Y02C,Y02P,Y10T

Abstract:
1. A method for making a gas transport film comprising a brominated styrene-butadiene copolymer, comprising brominating a starting styrene-butadiene copolymer having styrene units and 60 to 90 mole-% butadiene units to brominate at least 70 mol-% of the butadiene units and no more than 10% of the aromatic rings of the styrene units and then forming the brominated styrene-butadiene copolymer into a supported or free-standing film, the film having a thickness of 10 nanometers of 5 micrometers if supported or 0.025 to 0.5 mm if free-standing.