Patent ID: 8907029

Claim:
A process to prepare an olefin polymerization catalyst, said process comprising: (a) in a diluent, combining a diorganomagnesium compound of the formula MgRaRb with a first source of chloride to give a first product mixture, wherein the molar ratio of chloride in said first source of chloride to magnesium Mg is from 1.5:1 to 1.95:1 and where Ra and Rb are individually C 1 to C 8 hydrocarbyl groups; (b) without isolating any solids present in said first product mixture, combining said first product mixture with a second source of chloride to give a second product mixture, wherein the molar ratio of chloride in said second source of chloride to total magnesium Mg is from 0.01:1 to 0.7:1; wherein the total molar ratio of chloride from said first source of chloride and from said second source of chloride to magnesium Mg does not exceed a ratio of 2.2:1; (c) without isolating any solids present in said second product mixture, combining said second product mixture with a titanium species to give a third product mixture, said titanium species having the formula TiCl n (OR) m , wherein n is from 2 to 4, n+m=4 and OR is selected from an alkoxy group, an aryloxy group, or mixtures thereof; and (d) i) combining said third product mixture with an activator; or ii) combining solids isolated from said third product mixture with an activator; wherein the first source of chloride and the second source of chloride are each chosen from an organic chloride compound or HCl.