Patent ID: 6114478
Filing Date: 2000-09-05
Classification: B01J,C08F,Y10S

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 which is kept in motion by means of a stirrer, the transition metal-containing catalyst solid of the Ziegler- Natta or metallocene catalyst system being fed to the reactor with a 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 whereby the inclination of the pipes relative to the vertical (reactor middle) should be less than 30.degree. and wherein the vertical distance between the pipe end or ends and the surface of the stirred reactor bed is less than 15% of the distance between the upper reactor end and the stirred reactor bed.