Gas-phase polymerization of C2-C8-alk-1-enes by means of Ziegler-Natta or metallocene catalyst systems

摘要

A process for the homo- or copolymerization of C2-C8-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 C2-C8-alk-1-ene metered into the reactor, wherein the transition metal-containing catalyst solid, together with at least some of the C2-C8-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.