process for the production of polyethylene ethylenpolymerisation with broad molecular weight distribution, methods for the treatment of katalysatorbestandteils.

摘要

Process for polymerising ethylene or for copolymerising ethylene with an alpha-olefin, in suspension or in the gas phase, in the presence of a catalyst consisting of a cocatalyst and of a catalytic component containing at least titanium, magnesium and chlorine, characterised in that in a first stage the catalytic component, prior to its use, is subjected to a reduction treatment and that in a second stage the product of the first stage is treated with a chlorine-containing compound of a transition metal. …??The reduction treatment is preferably stopped when at least 50% by weight of the initial titanium has its degree of oxidation reduced by at least one unit.