Method of treating a poly(vinyl chloride) composition with dense phase carbon dioxide

摘要

The present invention concerns a method of treating a poly(vinyl chloride) composition comprising poly(vinyl chloride) particles and obtained by a process selected from suspension polymerization in an aqueous medium, microsuspension polymerization in an aqueous medium, emulsion polymerization in an aqueous medium and bulk polymerization, which method comprises contacting the poly(vinyl chloride) composition with supercritical carbon dioxide (scCO₂), near critical CO₂ or liquid CO₂.