Process for the preparation of isoolefin copolymers

US6846885B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerhard Langstein · Kürten, DE
• Martin Bohnenpoll · Cologne, DE

Key dates

• Filing date: Mar 21, 2003
• Grant date: Jan 25, 2005
• Expiry date: Mar 21, 2023

Classification

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

Abstract

The present invention provides a novel process for the preparation of isoolefin copolymers in the presence of zirconium halides or hafnium halides or mixtures thereof and organic nitro compounds, especially for the preparation of butyl rubbers, as well as isoolefin copolymers composed of isobutene, isoprene and, optionally, further monomers.