Gas-phase polymerization of C.sub.2 -C.sub.8 -alk-l-enes by means of Ziegler-Natta or metallocene catalyst systems

US6114478A · kind A · utility

Assignee

• BASF SE

Inventors

• Meinolf Kersting · Neustadt, DE
• Rainer A. Werner · Annaberg-Buchholz, DE
• Franz Langhauser · Bad Dürkheim, DE
• Gerald Lutz · Cologne, DE

Key dates

• Filing date: Dec 11, 1997
• Grant date: Sep 5, 2000
• Expiry date: Dec 11, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/901
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the homo- or copolymerization of C.sub.2 -C.sub.8 -alk-1-enes by means of a Ziegler-Natta or a metallocene catalyst system in a stirred bed of finely divided polymer from the gas phase, the transition metal-containing catalyst solid of the Ziegler-Natta or metallocene catalyst system being fed to the reactor by C.sub.2 -C.sub.8 -alk-1-ene metered into the reactor, wherein the transition metal-containing catalyst solid, together with at least some of the C.sub.2 -C.sub.8 -alk-1-ene, is fed to the reactor through one or more pipes which project perpendicularly or virtually perpendicularly from above into the gas space and end above the pulverulent stirred reactor bed.