Substantially gel-free high unsaturation copolymers of isobutylene and methylcyclopentadiene and high unsaturation terpolymers of isobutylene cyclopentadiene and methylcyclopentadiene and terpolymers of isobutylene, isoprene and methylcyclopentadiene having a number average molecular weight of at least about 120,000 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° C.
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