Dialysis membrane made of polysaccharide ether

Dialysis membrane for hemodialysis in the form of films, tubular films, or hollow filaments consisting of polysaccharide ethers, wherein the polysaccharide ether has a structure shown by the formula ##STR6## in which Cell is the skeleton of an unmodified cellulose molecule or of a chitin molecule, without hydroxyl groups, and in each case, s is 3 in the unmodified cellulose molecule and 2 in the chitin molecule, x corresponds to the degree of etherification which is in the range from 0.08 to (s -0.4), and in which R is at least one compound selected from the group consisting of optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, arylalkyl, arylalkenyl, arylalkynyl, bisarylalkyl, bisarylalkenyl, bisarylalkynyl group with 5 to 40 carbon atoms, the radical of an optionally substituted condensed aromatic compound and the radical of an optionally substituted heterocyclic compound.