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Abstract
AbstractMgCl2·6H2O was reacted with dichlorodiphenylsilane to obtain anhydrous magnesium dichloride. MgCl2 thus obtained was solubilized in 2‐ethyl‐1‐hexanol to prepare titanium catalysts for propylene polymerization through regeneration of magnesium dichloride by reaction with titanium tetrachloride. The nature of internal lewis base dialkyl phthalate [Ph(COOR)2, where R = Me, Et, and n‐Bu] and reactants concentration (alcohol and dialkyl phthalate) influence the chemical composition and specific surface area of catalysts. The activity of the catalysts changes in the order ßmethyl < ethyl < butyl. The polymerization parameters such as Al/Ti mole ratios, aging time of catalysts and cocatalysts (triethylaluminium) also control the activity. The concentration of the external Lewis base (dimethoxydiphenylsilane) improves the stereospecifity of the catalyst system.
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