Patent ID: 8143184

Claim:
A process for producing a Ziegler-Natta catalyst for olefin polymerization by reacting in solution a soluble magnesium complex containing aluminum, with a halogen containing compound of a transition metal of Group 4 to 10 of the Periodic Table (IUPAC), characterized in that after adding said transition metal compound into the solution of said soluble magnesium complex containing in addition to Mg and aluminum, also (ORO, R 1 and X, where each R 1 are independently a C 2-15 hydrocarbon group, and X is chlorine, the molar ratio of Al/Mg in the soluble complex is in the range of 1.5 to 2.5, and a solid catalyst complex comprising as essential components Mg, said aluminum and said transition metal compound is formed, which solid catalyst complex is recovered from the solution; wherein the soluble magnesium complex is provided by forming a washing solution by separating a solid MgCl 2 support from a reaction mixture and optionally washing the solid MgCl g support with a solvent.