Abstract
AbstractSupported titanium catalysts are prepared by chlorination of magnesium stearate with silicon tetrachloride (Mg, Ti‐S) or titanium tetrachloride (Mg, Ti‐T) followed by treatment of the product with diisobutyl phthalate and titanium tetrachloride. The data indicate that the change in the nature of the chlorinating compound affects the composition as well as physical characteristics of the catalysts. The results of propene polymerization show that the Mg, Ti‐T/AlEt3 catalyst system has about 50% more productivity and higher isospecificity as compared to the Mg, Ti‐S/AlEt3 system. Furthermore, the isospecificity of the Mg, Ti‐T/AlEt3 system is independent of polymerization time, whereas the Mg, Ti‐S/AlEt3 system shows a change of isospecificity with time. Addition of an external Lewis base and cocatalyst [triethoxy(phenyl)silane with triethyl‐aluminium] to the Mg, Ti‐T catalyst substantially improves the isospecificity of the system.
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