Patent ID: 8592536

Claim:
A process for producing homo- or copolymers by polymerizing C 2 to C 10 α-olefins or combinations thereof using an olefin polymerization catalyst, said catalyst comprises an alkylaluminium cocatalyst; and particles of a catalyst component prepared by steps comprising: 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 of a dispersed phase in a disperse phase, wherein the dispersed phase is in the form of droplets and contains more than 50 mol % of the Group 2 metal, c) agitating the emulsion in order to maintain the droplets of said dispersed phase within a 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 slurrying the solidified particles to an oily liquid without drying and optionally, g) recovering the dried or slurried solidified particles of the catalyst component, wherein H 2 gas is added during at least one of the production steps a) to f).