Continuous process for the preparation of bromochlorinated butyl

Details Continuous process for the preparation of bromochlorinated butyl Continuous process for the preparation of bromochlorinated butyl

1979-09-10

1981-03-03

Hamrock, William F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525355, 525357, 525358, C08F 820, C08F 822

Patent

active

042542405

ABSTRACT:
A solution of butyl rubber in an inert solution such as n-hexane is halogenated in a continuous process using bromine chloride vapor and high intensity mixing means for both the halogenation and subsequent neutralization steps. Adjustment of the mole ratio of bromine chloride to isoprene, where an isobutylene-isoprene butyl copolymer is used, to less than about 1.5 to 1 prevents overhalogenation and significant molecular weight loss, while the use of bromine chloride vapor results in improved process safety.
The doubly halogenated product, containing both bromine and chlorine in its structure can be vulcanized in the absence of sulfur, e.g., with zinc oxide. It is particularly useful in rubber compositions where the singly halogenated product is employed, but demonstrates product performance advantages compared to both brominated butyl rubber and chlorinated butyl rubber.

REFERENCES:
patent: 2962482 (1960-11-01), Cottle et al.
patent: 2965620 (1960-12-01), Serniuk et al.
patent: 3009904 (1961-11-01), Serniuk et al.
patent: 3009906 (1961-11-01), Eichhorn et al.
patent: 3966692 (1976-06-01), Driscoll et al.
patent: 4130519 (1978-12-01), Roper et al.

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