Process for the preparation of isoolefin copolymers

US6677421B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerhard Langstein · Kürten, DE
• Jurgen Ismeier · Forstinning, DE
• Martin Bohnenpoll · Cologne, DE
• Hans Krauss · Bamberg, DE
• Rui Resendes · Toronto, CA

Key dates

• Filing date: Aug 16, 2002
• Grant date: Jan 13, 2004
• Expiry date: Aug 16, 2022

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 and/or hafnium halides and organic acid halides, in particular for the preparation of butyl rubbers, as well as isoolefin copolymers constructed of isobutene, isoprene and optionally further monomers.