Process for producing thermoplastic molding compositions from polycondensation resins and aqueous latexes

The invention relates to a process for the production of molding compositions from a thermoplastic polycondensation resin susceptible to degredation at high temperature in the presence of H2O, to which is admixed a second synthetic resin, present as an aqueous latex, at temperatures in the range of 150 DEG -300 DEG C. and under a pressure in the range of 1-100 bar under the effect of high shear forces, for a time sufficient to provide the desired molding composition without substantially degrading the polycondensation resin.