Process technology for recovering brominated styrenic...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 8/20 (2006.01) C08F 6/10 (2006.01)

Patent

CA 2657939

Brominated styrenic polymer is recovered from solution in a vaporizable solvent by converting the solution in a devolatilization extruder into a brominated styrenic polymer melt or flow and a separate vapor phase comprised predominately of vaporizable solvent, recovering the melt or flow from the devolatilization 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 strength properties along with reduced formation of fines. Brominated anionic styrenic polymer is preferably used in the process.

La présente invention concerne un polymère styrénique bromé récupéré d'une solution dans un solvant vaporisable en convertissant la solution dans une extrudeuse de matière volatile en polymère styrénique bromé fondu ou liquide et une phase de vapeur séparée qui se compose en prédominance d'un solvant vaporisable, puis en récupérant la matière fondue ou liquide provenant de l'extrudeuse de matière volatile et en permettant ou en entraînant la solidification de la matière fondue ou liquide. Le polymère styrénique bromé solidifié peut être réduit en poudre ou sous forme de granules. Les granules ainsi formées ont une dureté et des propriétés de résistance au broyage et comportent peu de fines. Un polymère styrénique anionique bromé est utilisé de préférence dans le processus.

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