1. PROCESS FOR THE MANUFACTURE OF A THERMOPLASTIC MOLDING COMPOSITION ON THE BASIS OF POLY(OXYMETHYLENES), WHICH COMPRISES MIXING (A) FROM 99.9 TO 80 WEIGHT PERCENT OF A LINEAR POLY (OXYMETHYLENE), WHICH MAY CONTAIN UP TO 20 WEIGHT PERCENT, RELATIVE TO THE SAID POLY(OXYMETHYLENE), OF OXYALKYLENE GROUPS HAVING FROM 2 TO 8 ADJACENT CARBON ATOMS, AND (B) FROM 0.01 TO 20 WEIGHT PERCENT OF A POLY(OXYMETHYLENE) CONTAINING FROM 0.1 TO 30 WEIGHT PERCENT, RELATIVE TO THE SAID POLY(OXYMETHYLENE), OF POLYETHER SEGMENTS DERIVED FROM CYCLIC ETHERS HAVING 3 TO 5 RINGMEMBERS AND HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF AT LEAST 500, AND UP TO 20 WEIGHT PERCENT OF OXYALKYLENE GROUPS HAVING FROM 2 TO 8 ADJACENT CARBON ATOMS, EACH OF THE COMPONENTS BEING IN A PULVERULENT OR GRANULATED FORM AT A TEMPERATURE BELOW 100*C., AND SUBSEQUENTLY MELTING AND HOMOGENIZING THE MIXTURE IN A MIXING DEVICE AT A TEMPERATURE OF FROM 150* TO 250*C., AND THEN REMOVING IT FROM THE MIXING DEVICE.