Catalyst preparation using h2

A process for producing homo- or copolymers by polymerizing C2 to C10 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, wherein the dispersed phase of which is in the form of droplets and 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 catalyst component,
• wherein H2-gas is added to at least one of the production steps a) to g).

Particles of an olefin polymerization catalyst component having a predetermined average size range of 5 to 200 μm, said 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, wherein the dispersed phase of which is in the form of droplets and 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 H2-gas is added to at least one of the production steps a) to g).