Process for halogenating isomonoolefin copolymers

C - Chemistry – Metallurgy – 08 – F

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C08F 8/20 (2006.01) C08F 8/22 (2006.01)

Patent

CA 2257812

A process for halogenating a copolymer of a C4 to C7 isomonoolefin, e.g. isobutylene, and a multiolefin, e.g. isoprene or a para-alkylstyrene, e.g. para-methylstyrene, is disclosed. Increased halogenation efficiency and decreased reaction time is achieved by conducting the reaction in the presence of a halogen source and an aqueous emulsion containing a water soluble oxidizing agent, e.g. hydrogen peroxide, which oxidizes hydrogen halide generated in situ in the reaction back to free halogen.

-ette invention concerne un procédé d'halogénation d'un copolymère constitué d'une iso-mono-oléfine C¿4? à C¿7?, telle que l'isobutylène, et d'une multi-oléfine, telle que l'isopropène ou d'un para-alkylstyrène, tel que le para-méthylstyrène. On parvient à accroître le rendement de l'halogénation et à réduire le temps de réaction en effectuant la réaction en présence d'une source d'halogène et d'une émulsion aqueuse contenant un agent d'oxydation soluble dans l'eau, tel que le peroxyde d'hydrogène, qui oxyde l'halogénure d'hydrogène produit in situ au cours de la réaction et le retransforme en halogène libre.

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