Preparation of a catalyst for the manufacture of polyethylene.

摘要

A process for the preparation of a catalyst of the Ziegler type comprising the steps of: (a) contacting a support, preferably comprising a refractory oxide having hydroxyl groups, with an inorganic compound of fluorine and subsequently with a dialkyl magnesium or a trialkyl aluminium compound, (b) contacting the product of step (a) with a monochloro-organic compound, (c) contacting the product of step (b) with at least one tetravalent titanium compound and The inorganic compound of fluorine is preferably (NH4)2SiF6.