Patent · US Expired

Process for the preparation of isoolefin copolymers

US6562916B2 · kind B2 · utility

3Cited by

4References

6Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

Filing date	Aug 27, 2001
Grant date	May 13, 2003
Priority date	—
Expiry date	Aug 27, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F210/12
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.