Preparation of expandable thermoplastic polymers by post-impregnation

摘要

A process for the preparation of expandable thermoplastic polymers by post-impregnation with a blowing agent in aqueous suspension in the presence of a mixture of magnesium pyrophosphate and a sulfonate group-containing extender as suspension stabilizer, in a reactor comprises a) preparing the magnesium pyrophosphate in the same reactor at below 50 DEG C. by adding a solid magnesium salt in an amount corresponding to an at least 3% stoichiometric excess, based on pyrophosphate, to an aqueous solution of the pyrophosphate, b) heating the suspension medium to from 70 DEG to 140 DEG C. and c) adding the blowing agent in this temperature range.