| abstract |
The present invention is characterized in that the polymerization is carried out in basic aprotic solvents using a mechanical stirrer passing close to the wall, polysulfone with a yellowness index of less than 19 and yellow according to DIN 6167. It relates to a method for producing a polyether sulfone having a degree of less than 30. The invention also relates to the polyether sulfones and polysulfones initially obtainable by the process and to the use of these polymers for the production of shaped bodies, foils, membranes and foams. |