Patent ID: 8354483

Claim:
A reactor system for the catalytic polymerization of olefin monomer and optionally comonomer(s), comprising: one or more inlets for olefin monomer, catalyst, optionally for comonomer, chain growth controllers or chain transfer agents, and/or inert gas, an outlet for gas and an outlet for polymerized particles, wherein the reactor system comprises at least one fluidized bed unit and at least one moving bed unit, wherein the fluidized bed unit comprises means for maintaining a fluidized bed in the fluidized bed unit and wherein the moving bed unit is provided with an inlet and an outlet which are connected to the fluidized bed unit, wherein gas feed means for feeding gas at one or more different levels in the moving bed unit are present within the moving bed unit, and wherein the outlet of the moving bed unit is provided with means for displacing metered quantities of polymer particles from the moving bed unit into the fluidized bed unit.