Chain-extenders and foamed thermoplastic cellular materials obtained by reactive extrusion process and with help of said chain-extenders

摘要

An extrusion process to production of foamed cellular materials of polyester is disclosed in this invention, wherein chain-extending/branching concentrates comprising anhydrides, antioxidants and oxazolines can be used. Nucleate agents in form of a concentrate can be applied in individual quantity, depending on physical blowing agents. In addition, the invention relates to processes for preparation of said concentrates.