Patent ID: 7347938

Claim:
A method for producing a membrane comprising forming said membrane from a copolymer A comprising 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) C 8 -C 30 -alkyl esters of monoethylenically unsaturated C 3 -C 8 carboxylic acids; b2) N—C 8 -C 30 -alkyl-substituted amides of monoethylenically unsaturated C 3 -C 8 carboxylic acids; b3) N,N—C 8 -C 30 -dialkyl-substituted amides of monoethylenically unsaturated C 3 -C 8 carboxylic acids; b4) vinyl esters of aliphatic C 8 -C 30 carboxylic acids; and b5) C 8 -C 30 -alkyl vinyl ethers and a hydrophobic polymer B selected from the group consisting of polysulfones, polycarbonates, polyamides, polyvinyl chloride, hydrophobically modified acrylic polymers, polyethers, polyurethanes, polyurethane copolymers, water-insoluble cellulose derivatives, and mixtures thereof.