Process for the solid state polycondensation of linear polyesters

摘要

A separating or anticaking agent consisting of spherical glass particles having a diameter of 3 to 30 mu is added to polyester resin granulates to prevent agglomeration during solid state polycondensation in a plug-flow reactor. Thin-walled articles formed from the end product are characterized by high strength, high transparency, crystal clear color, good gas impermeability and a smooth surface.