PROCESS FOR THE PREPARATION OF POLYMER PARTICLES

摘要

IT IS DESIRABLE TO REDUCE THE AMOUNT OF VOLATILE ORGANIC BLOWING AGENT IN EXPANDABLE POLYSTYRENE. THIS MAY BE ACCOMPLISHED BY PARTIALLY POLYMERIZING A MASS OF STYRENE AND INCORPORATING THEREIN WATER TOGETHER WITH AN EMULSIFIER. THE PARTIALLY POLYMERIZED MASS IS THEN POLYMERIZED TO A HIGH CONVERSION USING CONVENTIONAL SUSPENSION TECHNIQUES. THE POLYMER BEADS CONTAINING WATER WHICH ACTS AS A BLOWING AGENT ARE RECOVERED.