Foamed spheres of thermoplastic polymer and process for the production thereof

摘要

The invention relates to foamed spheres of thermoplastic material. These spheres have a diameter of 1 to 10 mm and a bulk density of 100 to 1000 g/l and possess a cell structure with a closed envelope. The thermoplastic material is polyamide, polyester, polyethylene or polypropylene, preferably polyamide 6. <IMAGE>