Extrusion process for preparing improved brominated butyl...

Details Extrusion process for preparing improved brominated butyl... Extrusion process for preparing improved brominated butyl...

C - Chemistry, Metallurgy

08

F

402/460

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

Patent

CA 1244999

ABSTRACT OF THE DISCLOSURE A process for the continuous bromination of butyl rubber polymer by contacting the polymer with a brominating agent in a continuous flow device in which means are provided for disengaging reaction by-products and unreacted halogenating agents from the reaction mix- ture, by deforming and disrupting the brominated polymer surface and injecting a neutralizing agent into the polymer immediately after reaction thereby neutralizing the polymer, comprising contacting a polymer substan- tially free of acid scavengers, with the brominating agent at elevated temperatures the bromination reaction being carried out in an acid atmosphere, thereby produc- ing a polymer having a substantial fraction of the bromine in the primary allylic position.

491856

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