PROCESS FOR PRODUCING PULP-FORMING PARTICLES AND SYNTHETIC PAPER-LIKE TS MADE THEREFROM

摘要

A process for preparing pulp-forming particles comprises adding a solution in an aqueous organic solvent of a thermally stable aromatic nitrogen-containing polymer selected from aromatic polyamides and nitrogencontaining polyheterocyclic compounds to a precipitant to form a dispersion containing pulp-forming particles of the polymer. The precipitant consists of water and an amide-type solvent for the polymer present in selected ranges depending on the polymer used. The pulp-forming particles are heated to 30 to 90.degree.C in the presence of at least 2 parts by weight ofa mixture of aqueous organic solvent and precipitant, per part by weight of the pulp-forming particles. The resulting pulp-forming particles can be formed into synthetic paper by combination with thermally stable staple fibers. The synthetic paper has superior thermal stability, impregnating ability, texture uniformity and electrical insulation.