METHOD FOR CONTINUOUSLY PRODUCING POLYAMIDE OLIGOMERS AND FOR PRODUCING SEMICRYSTALLINE OR AMORPHOUS POLYAMIDES THAT CAN BE THERMOPLASTICALLY PROCESSED

摘要

The present invention relates to a continuous process for preparing polyamide oligomers. This is accomplished by continuously conveying an aqueous solution of the polyamide-forming monomer from a storage vessel to an oligomerization reactor, heating the aqueous solution to a temperature above the dissolution or storage temperature so that the conversion of the monomer to the polyamide oligomer does not exceed a maximum value Limiting the residence time of the monomer solution in the oligomerization reactor and / or adjusting the water pressure or partial vapor pressure so that the polyamide oligomer formed and / or the polyamide oligomer formed is not phase separated or spontaneously crystallized in solid form, and oligomerization And continuously discharging the polyamide oligomer from the reactor. Polyamide oligomers which can be prepared by this process can be provided continuously in a mixture with water in a semi-crystalline or amorphous thermoplastic processable polyamide preparation process, followed by post-condensation to provide polyamides. The polyamides can be used in the production of molded articles by injection molding, multicomponent injection molding, injection molding / welding, extrusion, coextrusion, blow molding or thermoforming.