Abstract:
The invention relates to foamable particulate self-extinguishing styrene polymers which, on account of their low content of oxyalkylation product of ammonia or amine, are suitable for making foam articles exhibiting good fusion and good dimensional stability, and to a process for their production.
Abstract:
PROCESS FOR PURIFYING WASTE WATER OBTAINED IN THE PRODUCTION OF STYRENE BEAD POLYMERS IN THE PRESENCE OF VINYL PYRROLIDONE POLYMERS OR VINYL ALCOHOL POLYMERS USED AS SUSPENSION STABILIZERS, WHICH PROCESS COMPRISES TREATING SAID WASTE WATER AT 70-180*C. WITH 0.02 TO 5% BY WEIGHT OF THE PERSULFATE OF SODIUM, POTASIUM OR AMMONIUM IN ORDER TO FLOCCULATE THE SUSPENDED MATTER.
Abstract:
Particulate, expandable styrene polymers containing a flame-proofing organic halo compound as expanding agent and also a mixture of from 2.5 to 30% by weight of a hydrocarbon of from 3 to 6 carbon atoms and from 97.5 to 70% by weight of monofluorotrichloromethane, based on the total weight of said mixture serving as expanding agent, show good processability and exhibit self-extinguishing properties even during processing.