Process for producing expansible granulates and foam obtained thereby.

摘要

Process for the production of expandable granules based on polyaryl ether sulphones and/or polyetherimides, containing 5 to 20% by weight of a physical blowing agent, the blowing agent and the polymers being mixed in an extruder and then being extruded directly into a medium at a temperature of less than 40 DEG C, and a process for the production of foams from expandable granules based on polyaryl ether sulphones and/or polyetherimides, containing 5 to 20% by weight of a physical blowing agent, the granules being pressed at a temperature of 120 to 250 DEG C and a pressure of 5 to 30 bar to give a sheet and then being expanded by reduction of the pressure.