Patent · US Active

Process for production of high-isoprene butyl rubber

US7446151B2 · kind B2 · utility

11Cited by

8References

7Claims

0Family size

Assignee

LANXESS Corporation · CA

Inventors

Rui Resendes · Toronto, 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	Aug 31, 2007
Grant date	Nov 4, 2008
Priority date	—
Expiry date	Aug 31, 2027

Classification

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

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.

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