MICROPOROUS CELLULOSE MEMBRANE, MANUFACTURE, BLOOD PLASMA SEPARATION AND MICROFILTRATION

摘要

A microporous membrane which has pore diameters of from 0.01 to 5 mu m, an ultrafiltration capacity of from 40 to 2000 ml/m2. h . mm Hg and an adjustable exclusion limit for molecular weights of from 70,000 to 3 million and which comprises hydrate cellulose regenerated from cuoxam solutions to which polyethylene glycol having an average molecular weight of from 100 to 1500 has been added is disclosed. A process for the production of such a membrane which comprises extruding a cellulose cuoxam solution, the spinning solution containing a copper salt in a quantity of from 40 to 60%, by weight, of copper, based on the weight of the cellulose, ammonium in a quantity of from 50 to 300%, by weight, of ammonia, based on the weight of the cellulose, and from 30 to 400%, by weight, based on the weight of the cellulose, of polyethylene glycol having an average molecular weight of from 100 to 1500 and from 4 to 7%, by weight, of cellulose into a coagulation bath is also disclosed. The present membranes offer certain advantages particularly in plasmaphoresis and microfiltration.