Manufacture of polysulphones

摘要

A polyaryl sulphone made from a reagent of the formulae H-Ar-SO2.X and/or an equimolar mixture of reagents of the formulae X.SO2-Ar-SO2.X and H-Ar-H, where X is a halogen atom and Ar is a bivalent aromatic radical, tends to suffer from an increase in the viscosity of the melt due to decomposition of terminal sulphonyl halide groups. A polymeric material containing no sulphonyl halide groups is obtained therefrom by reacting the polymer in solution with an organic compound such as aniline or diphenyl ether which will react with sulphonyl halide groups in the polymer to produce groups which are stable at temperatures at which the polymer is molten.