High molecular weight, gel-free isobutene copolymers with elevated double bond contents

摘要

The present invention provides a novel process for the production of low-gel, high molecular weight isoolefin copolymers in the presence of vanadium compounds and organic nitro compounds, in particular for the production of butyl rubbers, and isoolefin copolymers synthesized from isobutene, isoprene and optionally further monomers with a comonomer content of greater than 2.5 mol %, a molecular weight Mw of greater than 240 kg/mol and a gel content of less than 1.2 wt. %.