Patent ID: 6420489
Filing Date: 2002-07-16
Classification: C08F

Abstract:
A brominated isobutylene-isoprene polymer produced by the process comprising the steps of preparing a solution of said polymer in a solvent, adding to said solution bromine and reacting said bromine with said polymer at a temperature of from about 10Â°C. to about 60Â°C. and separating the brominated isoolefin-conjugated diolefin polymer, the amount of bromine being from about 0.3 to about 1.0 moles per mole of conjugated diolefin in said polymer, the improvement being that said solvent comprises an inert halogen-containing hydrocarbon selected from the group consisting of ethyl bromide, propyl chloride, n-butyl chloride and monochlorobenzene, wherein said solvent comprises water in an amount of 3 to 20 volume percent of water.