Process for the production of polyisoolefins

US5543479A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wolfgang Baade · Wildeshausen, DE
• Roland Heinrich · Berlin, DE
• Gerhard Langstein · Kürten, DE
• Thomas Mulder · Hanerau-Hademarschen, DE
• Judit E. Puskas · Akron, US

Key dates

• Filing date: Jul 27, 1995
• Grant date: Aug 6, 1996
• Expiry date: Jul 27, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/941
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyisoolefins are produced according to the invention by polymerizing isoolefins having 4 to 16 carbon atoms, optionally with conjugated diolefins having 4 to 6 carbon atoms and/or cationically polymerizable, mono- or polyunsaturated, organic compounds having 4 to 16 carbon atoms in the presence of mixtures of carbon dioxide and linear, branched and/or cyclic C.sub.4 -C.sub.8 alkanes and in the presence of catalysts at temperatures of -70.degree. C. to +20.degree. C. and pressures of 1 to 70 bar, wherein the weight ratio of carbon dioxide to alkanes is 10:90 to 90:10. The process according to the invention largely prevents the formation of fouling on the reactor walls, so ensuring better removal of heat. Moreover, in accordance with the process according to the invention, the polyisoolefins obtained may be directly chemically modified once the carbon dioxide has been removed.