Dialysis membrane and method for its production

A dialysis membrane in hollow-fiber membrane or flat membrane geometry comprising:

• a composite assembled from:
• at least one base membrane based on at least one polysulfone with at least one pore-forming hydrophilic additive, and
• at least one functional layer arranged on the at least one base membrane, whereby the at least one functional layer is formed from at least one layer of a polymeric polycationic bonding agent and at least another layer of a polymeric polyanion,
• wherein the base membrane is formed from a material which is selected from a group consisting of:
• a polysulfone, a sulfonated polysulfone, a polyethersulfone, a sulfonated polyethersulfone, a polyphenylsulfone, a sulfonated polyphenylsulfone, and mixtures thereof;
• wherein the polymeric polycationic bonding agent is selected from a group consisting of:
• polyethylenimine, chitosan, polylysine, polyarginine, polyornithine, and mixtures thereof;
• wherein the polymeric polyanion is a carboxylated polysaccharide or a sulfated polysaccharide which is selected from a group consisting of:
• a dextran sulfate with a molecular mass (Mw) of 15 kDa to 1 MDa, a sulfated chitosan with a molecular mass (Mw) of 30 kDa to 750 kDa, a cellulose sulfate with a molecular mass (Mw) of between 20 kDa and 1 MDa, and mixtures thereof;
• and
• wherein the at least one pore-forming hydrophilic additive is selected from a group consisting of:
• polyvinylpyrrolidone, a short-chain glycol with 2 to 10 C atoms, triethylene glycol, propylene glycol, polyethylene glycol/polyethylene oxide, and mixtures thereof.