BLOWING AGENT CONCENTRATE HAVING A THERMOPLASTIC PLASTICS MATERIAL AS SUPPORT

摘要

A blowing agent concentrate based on a chemical blowing agent and a thermoplastic plastics material as support. The support is a saturated polyester and/or copolyester with a crystallite melting point of from 100.degree.C to 220.degree.C and with a reduced viscosity of from 0.4 dl/g to 1.6 dl/g. These blowing agent concentrate are particularly suitable for use as flowinggas-releasing component in the production of structured foam moldings of high molecular weight polyalkylene terephtalates.