PROCESS TECHNOLOGY FOR RECOVERING BROMINATED STYRENIC POLYMERS FROM REACTION MIXTURES IN WHICH THEY ARE FORMED AND/OR CONVERTING SUCH MIXTURES INTO PELLETS OR INTO GRANULES OR PASTILLES

摘要

Brominated styrenic polymer is recovered from solution in a vaporizable s olvent by converting the solution in a devolatilization extruder into a brom inated styrenic polymer melt or flow and a separate vapor phase comprised pr edominately of vaporizable solvent, recovering the melt or flow from the dev olatilization extruder, and allowing or causing the melt or flow to solidify . The solidified brominated styrenic polymer can be subdivided into a powder or pelletized form. Pellets so made have improved hardness and/or crush str ength properties along with reduced formation of fines. Brominated anionic s tyrenic polymer is preferably used in the process.