Process for the preparation of thermoplastic foams using combination blowing agent.

摘要

A process for the preparation of an alkenyl aromatic polymeric foam. The process comprises blending water-containing organic vegetable matter with a volatile organic fluid foaming agent and alkenyl aromatic polymeric material under pressure and temperature below the critical temperature of the volatile organic fluid foaming agent, and extruding the resulting blowable mixture into a zone of lower pressure.