Process for production of high-isoprene butyl rubber

US7282548B2 · kind B2 · utility

Assignee

• LANXESS Corporation · CA

Inventors

• R. Resendes · Sarnia, CA
• Gabor Kaszas · London, CA
• Mark J. Drewitt · Sarnia, CA
• Stephan Glander · Wettswil, CH
• Gerhard Langstein · Kürten, DE
• Martin Bohnenpoll · Cologne, DE

Key dates

• Filing date: Feb 11, 2004
• Grant date: Oct 16, 2007
• Expiry date: May 5, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to 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 AlCl3 and a suitable proton source (e.g. water) or cationogen and at least one multiolefin cross-linking agent wherein the process is conducted in the absence of transition metal compounds and organic nitro compounds.