| abstract |
The invention relates to asymmetric macroporous membranes based on synthetic polymer, which are composed of a polymer mixture which is in the range from 5 to 70% by weight of polyvinylpyrrolidone with molecular weight, 100,000 Dalton and 95 to 30% by weight of polymer selected from one Group comprising polysulfone, polyether sulfone, aromatic or araliphatic polyamide, where the percentages by weight each relate to the total weight of the stated polymer mixture and the membrane has a water absorption capacity of at least 11% by weight water, based on its total weight, at 100% relative humidity and 25 ° C, and processes for their preparation. |