POLYIMIDE MEMBRANES AND THEIR USE FOR GAS SEPARATION

摘要

PATENT 173PUS04111 The present invention is a class of polyimide membranes wherein the diamine portion of the polymer structure is formed from 2 5-di-t-butyl-1 4phenylenediamine. Membranes formed from polyimides containing this diamine structure exhibit unexpectedly high gas permeability properties and are especially useful for separating oxygen from nitrogen or air.