POLYAMIDE BASED MEMBRANE FOR HEMOFILTRATION, METHOD FOR ITS PREPARATION, AND ITS USE

摘要

Disclosed is a specific polyamide membrane suitable for hemofiltration, comprising a permselective asymmetric membrane of heteroporous structure comprising a polyamide which comprises a plurality of recurring terephthaloyldiamine units. The membrane has an ultrafiltration capacity of from about 1.5 SM 10-3 to about 15x10-3 cm/sxbar, determined for water at 0.1 bar and 20 DEG C., a thickness of not more than about 100 microns, and a molecular weight exclusion limit of from about 20,000 to about 70,000 Dalton. The membrane is produced in a process which comprises introducing a solution of the polyamide in a water-miscible organic solvent into an aqueous precipitating liquid to obtain a coagulated membrane sheet, which is subsequently washed and dried.