C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 8/20 (2006.01)
Patent
CA 2659870
A brominated styrenic polymer reaction mixture containing at least (i) brominated styrenic polymer, (ii) bromination reaction solvent, (iii) hydrogen bromide, and (iv) Lewis acid bromination catalyst, and an aqueous medium in an amount sufficient to deactivate the Lewis acid catalyst but insufficient to form a separate continuous liquid phase in the resultant mixture are mixed together to terminate bromination. The advantages of using such small amounts of aqueous medium, as well as various follow on procedures are described.
Selon l'invention, pour arrêter la bromation, on mélange: un mélange réactionnel d'un polymère styrénique bromé contenant au moins (i) un polymère styrénique bromé, (ii) un solvant pour la réaction de bromation, (iii) du bromure d'hydrogène et (iv) un catalyseur de bromation de type acide de Lewis ; et un milieu aqueux en quantité suffisante pour désactiver le catalyseur acide de Lewis mais insuffisante pour former une phase liquide continue séparée dans le mélange résultant. L'invention concerne aussi les avantages de l'utilisation de quantités aussi faibles de milieu aqueux ainsi que différentes procédures de post-traitement.
Balhoff John F.
Kolich Charles H.
Albemarle Corporation
Macrae & Co.
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