Process for preparing halobutyl-type polymer

Details Process for preparing halobutyl-type polymer Process for preparing halobutyl-type polymer

1993-02-05

1994-08-30

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526295, 526296, C08F 206

Patent

active

053429087

ABSTRACT:
A halogenated polymer analogous to halogenated butyl rubber is prepared by a process wherein a monomer charge comprising isobutylene, and a conjugated diolefin having the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 which may be the same or different are a methyl group or a hydrogen atom and X is bromine or chlorine together with a initiator having the formula ##STR2## wherein each R.sub.4 may be the same or different is a alkyl, aryl or aralkyl group of 1 to 8 carbon atoms and n is a positive whole number are introduced into a suitable reaction vessel in a specified ratio at a temperature of from about -90.degree. to -10.degree.C., a solution of a Lewis acid is added and the monomers are copolymerized at said temperature to form said halogenated polymer, and the halogenated polymer is recovered from solution.

REFERENCES:
patent: 3067182 (1962-12-01), Jones
patent: 3299020 (1967-01-01), Hunter et al.
patent: 3700648 (1972-10-01), Hirooka
patent: 4074035 (1978-02-01), Powers et al.
patent: 4943616 (1990-07-01), Mishra
Sadykh-Zade et al in Dokl.Akad.Nauk Azerb. SSR 1968, 24(6) pp. 20-23 (Chem. Abstr. 70, 20786j).

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