Process for the continuous gas-phase (co-)polymerisation of olefins in a fluidised bed reactor
AssigneeBP Chemicals Limited
InventorsJean-Jacques Kuhlburger, Kenneth John Rowley
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Abstract
The present invention relates to a process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a chromium oxide catalyst characterized in that the polymerization is performed in the presence of a polymer structure modifier.
Claims10
A process for the continuous gas-phase (co-)polymerisation of olefins in a fluidised bed reactor, comprising contacting said olefins with an aluminium modified chromium oxide catalyst supported on silica and containing from 0.15 to 5% by weight of aluminium in the presence of a polymer structure modifier selected from the group consisting of CO, CO2, O2, H2O, NH3, N2O, H2O2 and mixtures thereof.
A process for producing an HDPE film having a dart impact as measured according to ASTM-D1709-01 Staircase method A on a 15 microns film which is higher than 150 g, the process comprising performing a continuous (co-)polymerisation of olefins in the gas phase in a single fluidised bed reactor with an aluminium modified chromium oxide catalyst supported on silica and containing from 0.15 to 5% by weight of aluminium, and during the process introducing a polymer structure modifier selected from the group consisting of CO, CO2, O2, H2O, NH3, N2O, H2O2 and mixtures thereof.
Dependencies are inferred from the claim text.