Method for the production of poly(meth)acrylonitrile-based polymer membranes, polymer membranes, and also solutions for the production of a polymer membrane

A method for the production of a polymer membrane, in which a solution comprising:

• a) poly(meth)acrylonitrile, a copolymer based on (meth)acrylonitrile, or a mixture thereof,
• b) dimethylsulphoxide (DMSO) as solvent for poly(meth)acrylonitrile or a copolymer based on (meth)acrylonitrile, and
• c) at least one non-solvent in which poly(meth)acrylonitrile or the copolymer based on (meth)acrylonitrile does not dissolve and which is miscible with the solvent,
• the solution being free of crosslinkers for poly(meth)acrylonitrile or copolymers based on poly(meth)acrylonitrile,
• being poured as a film or spun to form a hollow fibre,
• the poly(meth)acrylonitrile, copolymer based on (meth)acrylonitrile, or the mixture thereof being precipitated by a phase-inversion process,
• and the poly(meth)acrylonitrile, copolymer based on (meth)acrylonitrile, or the mixture thereof being stabilised by heat treatment at temperatures increased relative to room temperature.

A solution for the production of a polymer membrane, comprising

• a) poly(meth)acrylonitrile, a copolymer based on (meth)acrylonitrile or a mixture thereof,
• b) at least one solvent for poly(meth)acrylonitrile or a copolymer based on (meth)acrylonitrile in which the previously mentioned components are present in dissolved state;
• and
• c) at least one non-solvent in which poly(meth)acrylonitrile or the copolymer based on (meth)acrylonitrile does not dissolve and which is miscible with the solvent, the solution being free of crosslinkers for poly(meth)acrylonitrile or copolymers based on poly(meth)acrylonitrile.