Process for polymerizing olefin-based polymers containing high molecular weight fractions in condensed mode and super-condensed

摘要

A process for producing a polymer of an olefin basis which comprises polymerizing, in a polymerization reactor that includes a fluidized bed a disengaging zone and a neck connecting the bed and the disengagement zone, at least one monomer in the gas phase, in the presence of at least the following components: A) at least one catalyst containing at least two transition metals one of which is Ti; B) at least one cocatalyst; C) a composition comprising at least one compound selected from those of formula (I) and / or at least one compound selected from those of formula (II); where (R1CO2) 2AlOH (I) = formula (I), (R2) xN (R3OH) y = formula (II), R1 is a hydrocarbon radical having 13 to 25 carbon atoms, R2 is a hydrocarbon radical having from 14 to 26 carbon atoms, R3 is a hydrocarbon radical having 1 to 4 carbon atoms; x + y = 3 and x has a value of 1 or 2; and wherein further the reactor is operated in condensed mode and the average height of the fluidized bed is maintained above the neck of the polymerization reactor.