Patent ID: 6809056
Filing Date: 2004-10-26
Classification: C08F

Abstract:
A process for preparing polyolefin polymerization catalysts comprising the steps of:a) preparing a homogeneous magnesium solution by heating: i) magnesium compounds; ii) alcohols having 6 or more carbon atoms; and iii) hydrocarbon solvents having 6 or more carbon atoms; b) preparing magnesium precipitates by sequentially adding two or more alcohols having 5 or less carbon atoms to the homogeneous solution prepared in step a); c) adding primary organic aluminum compounds or alkylmagnesium halides to magnesium precipitates prepared in step b); d) adding titanium compounds to magnesium precipitates that passed through step c); e) adding secondary organic aluminum compounds or electron donors to the magnesium precipitates that passed through step d); and f) filtering, washing, and drying the magnesium precipitate solution that passed through step e).