Patent ID: 6849700
Filing Date: 2005-02-01
Classification: C08F

Abstract:
1. A process for the preparation of a particulate olefin polymerization catalyst component comprising a magnesium dihalide, a titanium tetrahalide and a carboxylic acid ester, comprising the steps of: (i) reacting in solution a magnesium compound containing an alkoxy group, a carboxylic acid halide and a tetravalent titanium compound containing a halogen, to obtain a dissolved reaction product, and (ii) recovering a fraction of the reaction product from step (i) in particulate form by precipitating the dissolved reaction product with an aromatic hydrocarbon and settling the precipitate by adding an aliphatic hydrocarbon to the precipitated reaction mixture or by precipitating and settling the dissolved reaction product with a mixture of an aliphatic and an aromatic hydrocarbon, the amount of the aromatic and aliphatic hydrocarbon being at least 5 mol per mol of magnesium.