Verfahren zur Herstellung von Verbundkoerpern aus Kunststoff

A process is claimed for manufacturing a two or more layer composite comprising a carrier material (6) mainly or wholly made of a polymer transparent to microwaves bonded to a porous layer (7) based on a chemically-blown polymer foam which absorbs microwaves. The foamable polymer is heated by microwaves to activate the blowing agent and the polymer foam (7) created is simultaneously or subsequently heated by microwaves so that conducted heat melts the surface of the adjacent carrier material (6) and bonds the latter to the foam after cooling. USE - Used for production of composite structures used as heat or noise insulating elements in vehicle construction or structural engineering. ADVANTAGE - The bond between the layers requires no solvent ensuring a more environmentally friendly process.