| 主权项 |
1. A process for preparing a filtration membrane having an average molecular cut-off <1000 g/mol, the process comprising:
a) contacting at least one filtration membrane having an average molecular cut-off between 3000 g/mol and 15,000 g/mol, comprising at least one bonded textile fabric coated with at last one of: at least one polyether sulphone and at least one hydrophilicized polyether sulphone, with an aqueous medium having a water content of not less than 99%, and b) contacting the filtration membrane from step a) with at least one polyethylene glycol in the presence of at least one different aliphatic, cyclic or non-cyclic, branched or unbranched, saturated or unsaturated, mono-, di- or trihydric alcohol, wherein the polyethylene glycol is used in an amount of 5 wt % to 50 wt %, based on the combined amount of polyethylene glycol and alcohol, and the sum total of polyethylene glycol and alcohol used in process step b) is >95 wt %, based on the overall amount of the mixture used, and c) claims filtration membrane from step b). |
