USE OF HETEROGENEOUS CATALYSTS IN METHODS FOR THE PRODUCTION OF POLYAMIDES

摘要

The invention relates to the use of metal oxides as heterogeneous catalysts in a method for the production of polyamides by polymerization of lactams and possibly other polyamide-forming monomers. According to said method the meta l oxides are used in a form which permits their mechanical separation from the reaction mixture and during or at the end of polymerization are separated fr om the reaction mixture so as to reduce the content of extractable compounds in the polyamide obtained in this way.