Process for increasing molecular weight of polybutadiene or polyisoprene produced in a gas phase polymerization using a polymerization catalyst

摘要

There is provided a method for increasing the molecular weight of high cis-1,4,-polybutadiene and/or polyisoprene as it is polymerized in a gas phase process from 1,3-butadiene or isoprene in the presence of a nickel, cobalt, or titanium metal containing catalyst, which method comprises introducing a light boiling, high volatility hydrocarbon such as isopentane to said polymerization.