Brominated styrenic polymers and their preparation

Details Brominated styrenic polymers and their preparation Brominated styrenic polymers and their preparation

C - Chemistry, Metallurgy

08

F

C08F 8/20 (2006.01)

Patent

CA 2614096

Preparing brominated styrenic polymer by maintaining a mixture formed from (i) brominating agent, (ii) a solvent solution of styrenic polymer, and (iii) aluminum halide catalyst, at -20 to +20 ~ C, and terminating bromination in 20 minutes or less. New brominated anionic styrenic polymers have better melt flow and/or lower initial .DELTA.E values than the best previously-known brominated anionic styrenic polymers. Other features of such new polymers include high thermal stabilities at 320~ C and/or very low initial color values. Brominated styrenic polymers, especially brominated anionic styrenic polymers, are useful as flame retardants for thermoplastic polymers.

Polymère styrène bromé dont la préparation consiste à maintenir un mélange formé à partir (i) d'un agent bromant, (ii) d'une solution de polymère styrène en tant que solvant et (iii) d'un catalyseur halogénure d'aluminium, à une température de -20 à +20 °C, et à achever la bromation en 20 minutes ou moins. Ces nouveaux polymères styrène anioniques bromés possèdent de meilleures valeurs de fluage et / ou des valeurs ?E initiales plus basses que les meilleurs polymères styrène anioniques bromés connus. Ces nouveaux polymères possèdent d'autre caractéristiques telles qu'une stabilité thermique élevée à 320 °C et / ou des valeurs de couleur initiales très faibles. Ces polymères styrène bromés, en particulier les polymères styrène anioniques bromés, sont utiles en tant que retardateurs de flamme pour des polymères thermoplastiques.

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