Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1994-03-15
1995-12-05
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C08F 416
Patent
active
054730295
ABSTRACT:
A halogenated butyl rubber is prepared by a process wherein a monomer charge comprising isobutylene and 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 an initiator having the formula ##STR2## wherein each R.sub.4 is an alkyl, aryl or aralkyl group, Y is preferably an alkoxy, hydroxy, carboxyl or halide, and n is a positive whole number from 1 to 3 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 butyl rubber, and the halogenated rubber is recovered from solution.
REFERENCES:
patent: 3067182 (1962-12-01), Jones
patent: 3299020 (1967-01-01), Hunter et al.
patent: 4074035 (1978-02-01), Powers et al.
Sadykh--Zade et al in Dokl.Akad.Nauk.Azerb. SSR 1968, 24(6) pp. 20-23 (Chem. Abstr. 70, 20786j).
Akorli Godfried R.
Bayer Rubber Inc.
Gil Joseph C.
Henderson Christopher
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