Use of hydrophobically modified copolymers based on N-vinyl monomers for the production of membranes

A semipermeable, water-wettable membrane comprising at least one copolymer A formed from

• a) from 50 to 99% by weight of at least one N-vinyllactam or N-vinylamine selected from the group consisting of N-vinylpyrrolidone, N-vinylpiperidone, N-vinylcaprolactam, N-vinylimidazole, methylated N-vinylimidazole, and N-vinylformamide, and
• b) from 1 to 50% by weight of at least one monomer selected from the group consisting of
• b1) C8-C30-alkyl esters of monoethylenically unsaturated C3-C8 carboxylic acids;
• b2) N—C8-C30-alkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
• b3) N,N—C8-C30-dialkyl-substituted amides of monoethylenically unsaturated C3-C8 carboxylic acids;
• b4) vinyl esters of aliphatic C8-C30 carboxylic acids;
• and
• b5) C8-C30-alkyl vinyl ethers,
• and a hydrophobic polymer component B, selected from the group consisting of polysulfones, polycarbonates, polyamides, polyvinyl chloride, hydrophobically modified acrylic polymers, polyethers, polyurethanes, polyurethane copolymers, cellulose acetates, cellulose nitrates, and mixtures thereof.