High unsaturation butyl rubbers with additives

Abstract

Substantially gel-free, high unsaturation copolymers of isobutylene and isoprene and high unsaturation terpolymers of isobutylene, isoprene and cyclopentadiene having a number average molecular weight of at least about 90,000 and a mole percent of unsaturation of at least 5% and the process for preparing said polymers which comprises carrying out the polymerization in a homogeneous phase, introducing to the system either an aluminum halide in a soluble form or a hydrocarbylaluminum dihalide and carrying the reaction out at a temperature of less than about -100.degree. C. Vulcanizable compositions are formed from the co- and ter- polymers by reacting them with a vulcanizing amount of sulfur donor and a delayed action accelerator, wherein the vulcanized compositions can be extended with fillers, non-polar process oils and rubbers.

Dependencies are inferred from the claim text.