Patent ID: 7432220

Claim:
A process for producing a particulate support for an olefin polymerization catalyst having an average particle size distribution between 1 to 500 μm, the process comprising, adding a solution of a magnesium compound of a formula (I): Mg (OR 2 ) 2-n-x(R 1 ) n X x (I): wherein each R 1 and R 2 independently represent a C 3-10 hydrocarbyl group; X is a halogen; 0 ≦ n < 2 and may or may not be an integer; x <2 and may or may not be an integer; the sum of (2- n), n, and x is 2 to a solution of a halogen-containing aluminum compound selected from the group consisting of dimethyl aluminium chloride, diethyl aluminium chloride, methyl aluminium dichloride and ethyl aluminium dichloride, to obtain a solid reaction product in a liquid reaction medium; recovering the solid reaction product by separating the solid reaction product from the liquid reaction medium; and washing the solid reaction product with a wash solution until the molar ratio of aluminum to magnesium has a value of at least 0.3.