METHOD OF PREPARING A CATALYST COMPONENT FOR THE POLYMERIZATION OF OLEFINS

摘要

The invention relates to a new method for preparing a supported procatalyst of a catalyst system intended for the polymerization of olefins, in which the reaction product formed from magnesium halogenide and an alcohol is treated in order to remove the alcohol and is activated with a transition metal compound and optionally an electron donor. In solutions of prior art the transition metal compound reacts with the alcohol as well as with the magnesium chloride and additionally acts as a medium for separating the by-product formed of it self and the alcohol. The problem is then that great amounts of transition metal are wasted and that said by-product is a hazardous waste that is difficult to treat. These problems have been solved in the present invention by removing the alcohol with the aid of a separate grinding-evaporation step. The grinding-evaporation step is preferably carried out by jet mills by using a temperature gradient for the gas.