Ineos Sales (uk) Limited

Ineos Sales Limited

Stephan Detournay

Christophe Moineau

Pierre Mangin

Julie Bigeault

The present invention relates to a process for polymerization of olefins, in particular gas phase polymerization of olefins, with the aid of a supported chromium oxide based catalyst.

Process for the polymerisation of olefins

The present invention relates to a chromium catalyzed ethylene copolymer powder exhibiting a superior fragmentation coefficient.

Chromium catalysed ethylene copolymer powder

Process for the activation of a supported chromium oxide based catalyst in a fluidized bed activation reactor which has a catalyst bed being fluidized by a fluidization gas. The activation includes treatment at temperatures above 500&#xb0; C., in which in an initial stage, where there is an initial temperature increase, the fluidization velocity (Vf1) of the fluidization gas is maintained below 6.5 centimeters per second (cm/sec) until the temperature inside the activation reactor reaches at least 200&#xb0; C., and the fluidization gas is then brought to a value (Vf2) which is at least 1 cm/sec higher than Vf1.

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Stombeek-Bever, Belgium

Stephan Detournay