| abstract |
Asymmetric semipermeable membranes which consist of aromatic polycondensates having recurring units of the formula (-O-Z-O-Y-)n (I) in which Y is the divalent radical of an aromatic sulphone or of an aromatic ketone and -O-Z-O-is a divalent diphenolate radical which consists to the extent of 0.1-100 mol % of all the diphenolate radicals of those of the formula <IMAGE> (V) with the meaning given in the description, are suitable for haemodialysis, haemodiafiltration, haemofiltration, ultrafiltration, microfiltration and reverse osmosis. |