Patent ID: 6300381
Filing Date: 2001-10-09
Classification: B01D,C08J,H01M,Y02E,Y02P

Abstract:
An acid-base blend polymer membrane produced by a process comprising(a) preparing a solution of a polymeric sulfonic acid or a polymeric sulfonate salt of formula (I) in a dipolar-aprotic solventPolymer-SO.sub.3 X (I)where X=H or a monovalent cation;(b) dissolving a basic polymer containing primary, secondary or tertiary basic N groups in solution (a), wherein said basic polymer is selected from the group consisting of poly(etherketone)s and poly(ethersulfone)s;(c) spreading a thin laver of polymeric solution (b) onto a support;(d) evaporating the solvent to form a polymeric film;(e) removing the formed polymeric film from the support;(f) post-treating the film in diluted mineral acid at temperatures from ambient temperature to 100.degree. C.; and(g) post-treating the film in deionized water at temperatures of from ambient temperature to 100.degree. C. until all excess acid is washed out from the polymeric film.