Ziegler-natta catalyst and preparation thereof

A method for producing solid MgCl2 supported catalyst component comprising the steps

• a) providing solid carrier particles of MgCl2*mROH adduct;
• b) pre-treating the solid carrier particles of step a) with a compound of Group 13 metal;
• c) treating the pre-treated solid carried particles of step b) with a transition metal compound of Group 4 to 6;
• d) recovering the solid catalyst component;
• wherein the solid carrier particles are contacted with an internal organic compound of formula (I) or isomers or mixtures therefrom before treating the solid carrier particles in step c)
• wherein in the formula (I)
• R1 to R5 are the same or different and are hydrogen, a linear or branched C1 to C8-alkyl group, or a C3-C8-alkylene group, or two or more of R1 to R5 can form a ring, the two oxygen-containing rings are individually saturated or partially unsaturated or unsaturated, and R in the adduct MgCl2*mROH is a linear or branched alkyl group with 1 to 12 C atoms, and m is 0 to 6;
• and
• wherein the solid catalyst component has Mg/Ti mol/mol ratio of 1 to 10, Al/Ti mol/mol ratio of 0.01 to 1, and Cl/Ti mol/mol ratio of 5 to 20.