INCREASING THE MOLECULAR WEIGHT OF POLYCONDENSATES AND STABILIZING THEM, USING DIEPOXIDES OF STERICALLY HINDERED AMINES

摘要

The invention relates to a process for increasing the molecular weight of polyco ndensates and at the same time stabilizing them, essentially without crosslinking, which c omprises heating a polyamide, a polyester, a polycarbonate or a copolymer or blend of the se polymers with addition of at least one diepoxide comprising terminal epoxide groups and a s a further structural element a tetramethylpiperidine radical located centrally between the epoxide groups to a temperature which is above the melting point of the polymer in the c ase of crystalline polycondensates or above the glass point in the case of amorphous polycondensates. The invention additionally relates to mixtures comprising the corresponding diepoxides, to their use, and to polycondensates prepared from the m.