PROCESS FOR PREPARING POLY- AND COPOLYETHER SULFONES Russian patent published in 1994 - IPC

FIELD: electroinsulating materials. SUBSTANCE: reaction of aromatic bisphenols in n inert atmosphere and haloaromatic sulfones in dimethylsulfone in the presence of an excess of a mixture of carbonate and potassium hydrocarbonate relative to the aromatic bisphenols, comminution of the reaction mixture until completion of the synthesis directly or after dilution with a solvent to a reaction mixture to solvent ratio of 1: 5, preferably 1: 2, to a particle size of 0.01-5.5 mm, preferably 0.5-1.0 mm, and washing with an extracting agent while stirring. The excess of the mixture of carbonate and potassium hydrocarbonate is not greater than 50 mole % . The extracting agent includes water or liquid including a multicomponent compound causing swelling of a polymer. The extracting agent and dimethylsulfone extracted from the reaction mixture is regenerated for reuse. EFFECT: higher efficiency. 5 cl, 5 ex