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Process for production of high-isoprene butyl rubber.

U.S. patent: 7,282,548

Issued: October 16, 2007

Inventors: R. Resendes, Gabor Kaszas, Mark J. Drewitt, Stephan Glander, Gerhard Langstein and Martin Bohnenpoll

Assigned: Lanxess

Key statement: A continuous process for producing polymers at conversions ranging from 50% to 95% having a Mooney viscosity of at least 25 Mooney-units and a gel content of less than 15 wt. % containing repeating units derived from at least one isoolefin monomer, more than 4.1 mol % of repeating units derived from at least one multiolefin monomer and optionally further copolymerizable monomers in the presence of Al[Cl.sub.3] and a suitable proton source (e.g., water) or cationogen, and at least one multiolefin crosslinking agent, wherein the process is conducted in the absence of transition metal compounds and organic nitro compounds.
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Title Annotation:Patent News
Publication:Rubber World
Date:Nov 1, 2007
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