(DE19622337-C1)      Preparing crosslinked polymers comprises removing the solvent from solutions of sulphinic acid- or sulphinic acid salt (-SO2Me) modified polymers and crosslinking to form crosslinked polymers, optionally in the presence of organic di-halogen or oligo-halogen compounds [R(Hal)x], (where Me = a metal cation with one or more valencies, R = optionally substituted alkyl or aryl residue with 1-20 C and Hal = F, Cl, Br or I).    USE -   Especially used for the fabrication of crosslinked cation exchange membranes for use e.g. in electrodialysis or membrane type fuel cells.    ADVANTAGE -   The process can be used for crosslinking of any sulphinic acid (salt) modified polymer; other polymers may be mixed with the sulphinic acid (salt) modified polymer to give crosslinked polymers with a wide range of tailored microstructures and crosslink densities; the crosslinked polymers have improved chemical and thermochemical resistance in comparison to the starting polymers; the crosslinked polymers and membranes have improved resistance to hydrolysis in comparison to materials crosslinked by other methods, e.g. sulphonate-modified polymers crosslinked by way of sulphonamide bridges.    (US6221923-B1)      Preparing crosslinked polymers comprises removing the solvent from solutions of sulphinic acid- or sulphinic acid salt (-SO2Me) modified polymers and crosslinking to form crosslinked polymers, optionally in the presence of organic di-halogen or oligo-halogen compounds [R(Hal)x], (where Me = a metal cation with one or more valencies, R = optionally substituted alkyl or aryl residue with 1-20 C and Hal = F, Cl, Br or I).    USE -   Especially used for the fabrication of crosslinked cation exchange membranes for use e.g. in electrodialysis or membrane type fuel cells.    ADVANTAGE -   The process can be used for crosslinking of any sulphinic acid (salt) modified polymer; other polymers may be mixed with the sulphinic acid (salt) modified polymer to give crosslinked polymers with a wide range of tailored microstructures and crosslink densities; the crosslinked polymers have improved chemical and thermochemical resistance in comparison to the starting polymers; the crosslinked polymers and membranes have improved resistance to hydrolysis in comparison to materials crosslinked by other methods, e.g. sulphonate-modified polymers crosslinked by way of sulphonamide bridges.    (US2001002408-A1)      Preparing crosslinked polymers comprises removing the solvent from solutions of sulphinic acid- or sulphinic acid salt (-SO2Me) modified polymers and crosslinking to form crosslinked polymers, optionally in the presence of organic di-halogen or oligo-halogen compounds [R(Hal)x], (where Me = a metal cation with one or more valencies, R = optionally substituted alkyl or aryl residue with 1-20 C and Hal = F, Cl, Br or I).    USE -   Especially used for the fabrication of crosslinked cation exchange membranes for use e.g. in electrodialysis or membrane type fuel cells.    ADVANTAGE -   The process can be used for crosslinking of any sulphinic acid (salt) modified polymer; other polymers may be mixed with the sulphinic acid (salt) modified polymer to give crosslinked polymers with a wide range of tailored microstructures and crosslink densities; the crosslinked polymers have improved chemical and thermochemical resistance in comparison to the starting polymers; the crosslinked polymers and membranes have improved resistance to hydrolysis in comparison to materials crosslinked by other methods, e.g. sulphonate-modified polymers crosslinked by way of sulphonamide bridges.