Process for the preparation of a catalyst system

A process for the production of a catalyst system comprising the steps of

• 1) providing a solution I
• wherein solution I comprises a hydrocarbon solution comprising the reaction product of
• a) a magnesium-containing compound selected from an organic oxygen-containing magnesium compound and/or a halogen-containing magnesium compound;
• and
• b) an organic oxygen-containing titanium compound
• wherein the molar ratio of magnesium:
• titanium is lower than 3:1;
• 2) providing a solution II
• wherein solution II comprises a hydrocarbon solution comprising
• an organo aluminium halide having the formula AlRnX3-n in which R is a
• hydrocarbon moiety containing 1-10 carbon atoms, X is a halogen and 0<n<3;
• 3) selecting a value Y the range from 1-12, wherein Y is defined as the molar ratio of aluminium of solution II to titanium of solution I,
• 4) dosing solution I and II to a receiving means, in a time t from ≥t1 to <tend in such a way that Y might vary in the range of Y−35% to Y+5% of Y at any point in time t for the selected Y, and in such a way that solution I or II or solution I and II are selected to be dosed at any point in time t from ≥t1 to <tend,
• wherein at tend the selected range of Y is obtained and tend is defined as a point in time
• where no further solution selected from solution I or II or I and II is dosed.