Patent ID: 7084217

Claim:
A process for the preparation of a supported olefin polymerisation catalyst composition consisting essentially of the consecutive steps of (a) mixing a solid, porous carrier in a non-polar solvent to form a mixture thereof, (b) contacting said mixture with at least one organomagnesium compound of the formula R m M g R′ n , where R and R′ are the same or different alkyl groups, and m and n are each 0, 1 or 2, providing that m+n is 2, and optionally, at least one organoaluminium containing compound, (c) optionally contacting the resulting mixture from (b) with at least one chlorinating agent (X), (d) subsequently, contacting the resulting mixture from (b) or (c) with at least one borate compound, and (e) contacting the resulting mixture from (d) with at least one transition metal compound soluble in the non-polar solvent.