| 摘要 |
<p>A halogenated butyl rubber is prepared by a process wherein a monomer charge comprising isobutylene, and a conjugated diolefin having the formula <CHEM> wherein R1, R2 and R3 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 <CHEM> wherein each R4 is an alkyl, aryl or aralkyl group, Y is preferably an alkoxy, hydroxy, peroxy ester or halide, 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 DEG to -10 DEG 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.</p> |
