| abstract |
Dialysis membrane made of regenerated cellulose in the form of flat films, tubular films or hollow fibers by shaping a spinning solution, which essentially consists of cellulose and a tertiary amine oxide, into a non-solvent, characterized in that the dialytic permeability for vitamin B 12, which can be set as a function of the ultrafiltration performance, measured at 20 ° C, is equal to or greater than that from the linear regression equation calculable value, the ultrafiltration performance being between 0 and 10 10-4 ml / minN, and a method for producing the dialysis membrane which is characterized in that a mixture of 7% by weight to 25% by weight cellulose, 50% by weight of tertiary amine oxide, optionally up to 25% by weight of non-solvent and up to 10% by weight of conventional additives, in a mixing device in less than 8 minutes. and is brought to a solution at temperatures between 80 and 150 ° C, that the solution is degassed, extruded through a slot die, ring slot die or hollow filament die into a precipitation bath, washed and dried after addition of plasticizer with shrinkage hindrance at temperatures between 50 and 110 ° C and wakes up. |