Composite or asymmetric fluorine-containing polyimide membrane, a process for manufacturing the same and a method for the separation and concentration of gas using the same

摘要

A composite or asymmetric membrane for separating and concentrating a particular component from a mixture of gases. The asymmetric membrane is of a fluorine-containing aromatic polyimide resin of the 6FDA type. The composite membrane has a thin film of an elastomeric polymer formed on a supporting film of a fluorine-containing aromatic polyimide resin of the 6FDA type.