Borealis Ag

Hanna-Leena Rönkkö

Timo Leinonen

Peter Denifl

Torvald Vestberg

Kumudini Jayaratne

The present invention relates to A Ziegler-Natta catalyst component in the form of solid particles having a median a particle size (D50) of 5 to 200 &#x3bc;m and comprising i) a compound of Group 1 to 3, preferably of Group 2 metal, IUPAC, Nomenclature of Inorganic Chemistry, 1989 ii) a compound of a transition metal of Group 4 to 10, or of a lanthanide or actinide, preferably a transition metal of Group 4 to 6, IUPAC, Nomenclature of Inorganic Chemistry, 1989 and iii) an internal electron donor, wherein the solid particles a have a numerical SPAN of 0.80 or below and a ratio of numerical mode to volumetric mode (Mode/Mode) of 0.60 or more and we Wherein Mode&#x3c;Mode. The invention also relates to a process for producing said catalyst component and use thereof producing Cto C&#x3b1;-olefin polymers, especially propylene or ethylene polymers or copolymers thereof with &#x3b1;-olefins of 2 to 12 C-atoms.

Catalysts

The present invention relates to a solid, particulate catalyst component having an mean particle size range of 5 to 200 &#x3bc;m and comprising a compound of a Group 2 metal, a compound of a transition metal of Group 4 to 6, and at least two internal electron donors being different to each other and being non-phthalic organic compounds selected from (di)esters of non-phthalic carboxylic (di)acids, 1,3-diethers and di-esters of 1,3-diol compounds and derivatives thereof, and wherein the solid particulate catalyst component is free of any external support material. The invention relates also to the preparation of the catalyst component and a polymerization process for producing propylene polymers.

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Porvoo, Finland

Hanna-Leena Rönkkö