METHOD FOR SYNTHESIZING POLYARYLETHERKETONES

摘要

The invention relates to a process for synthesizing polyaryl ether ketones with low contents of residual materials, whether they are residual monomers or solvents of the synthetic process.

主权项

1. A process for preparing polyaryl ether ketones, which consists of the following steps:
placing one or more aromatic acid chlorides and one or more aromatic ethers in contact with a Lewis acid in a solvent which dissolves water only to a content of less than 0.05% at 25° C. at a temperature of between −5 and +25° C., with stirring; completion of the polymerization at a temperature of between 50 and 120° C.; separation of part of the solvent; placing the reaction mixture in contact with water with stirring in the optional presence of acid; separation of the polyaryl ether ketones and of the liquid effluents; washing of the polyaryl ether ketones with water in the presence or absence of acid and separation of the aqueous liquors; azeotropic distillation on the polymer containing residual solvent and separation of the aqueous liquors; washing and neutralization of the acidity of the effluents and of the PAEK particles and separation of the aqueous liquors; drying of the polyaryl ether ketones at a temperature above Tg +20° C.