CONTINUOUS PROCESS FOR MAKING EXPANDABLE THERMOPLASTIC RESIN COMPOSITIONS

摘要

A continuous process for the production of expandable thermoplastic polymer compositions obviating the use of a pressure vessel for polymerization is described. Freshly polymerized, devolatilized polymeric melt and a blowing agent are mixed prior to complete cooling of the melt and extruding the mixture at a continuous rate equal to the rate at which the mixture is supplied, to obtain greatly improved product properties.