Process for preparing expanded articles based on ethylene-chlorotrifluoro-ethylene copolymers

摘要

The invention relates to a process for preparing expanded articles based on ethylene-chlorotrifluoroethylene copolymers having high dielectric characteristics consisting in mixing the copolymer with 0.5-2% by weight of boron nitride, extruding the blend at 260-300 DEG C, injecting into the molten blend nitrogen at 50-150 atmospheres and lowering the pressure for obtaining the expanded article.