Patent ID: 8216957

Claim:
Process for preparing an olefin polymerization catalyst component in the form of particles having a predetermined average size range of 5 to 200 μm, said process comprising the steps of: a) preparing a solution of a complex of a Group 2 metal and an electron donor by reacting a compound of said metal with said electron donor or a precursor thereof in an organic liquid reaction medium, b) adding said solution of said complex to at least one compound of a transition metal to produce an emulsion, wherein the dispersed phase, of which is in the form of droplets, contains more than 50 mol % of the Group 2 metal in said complex, c) agitating the emulsion in order to maintain the droplets of said dispersed phase within said predetermined average size range, d) solidifying said droplets of the dispersed phase, e) washing the solidified particles at least once, f) drying the solidified particles or slurring the solidified particles to an oily liquid without drying and optionally g) recovering the dried or slurried solidified particles of the olefin polymerization catalyst component, wherein H 2 -gas is added to at least one of the production steps a) to g), and wherein said catalyst component is produced under oxygen and moisture free conditions.