Patent ID: 6632847
Filing Date: 2003-10-14
Classification: H01M,Y02E,Y02P

Abstract:
A membrane comprising from 30 to 99.5% by weight of a sulfonated aromatic polyether ketone which has an ion-exchange capacity of from 1.3 to 4.0 meq (â€”SO3H)/g of polymer, and from 0.5 to 70% by weight of a polybenzimidazole, obtainable by a process comprising the following steps:a) preparing a solution comprising from 30 to 99.5% by weight of a sulfonated polyether ketone and from 0.5 to 70% by weight of a polybenzimidazole by dissolving the salt of the sulfonated polyether ketone and the polybenzimidazole in an organic solvent, b) using the solution obtained in step a) to produce a membrane having a thickness of at least 5 &mgr;m, c) washing the membrane obtained in step b) with water or with a dilute acid of from 0.1 to 20% strength.