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US 4,306,047 AGranted
Propylene polymerization
AssigneeShell Oil Company
InventorsAndras G. T. G. Kortbeek, Wilhelmina J. M. van der Linden-Lemmers
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AssigneeShell Oil Company
InventorsAndras G. T. G. Kortbeek, Wilhelmina J. M. van der Linden-Lemmers
Estimating the term…
A TiCl.sub.3 olefin polymerization catalyst component is prepared by reducing TiCl.sub.4 with an aluminum trihydrocarbyl compound in a molar ratio of Ti:Al of 2.7:1 to 4.0:1 in the presence of diisoamyl ether and a hydrocarbon solvent by gradually adding TiCl.sub.4 to the aluminum trihydrocarbyl compound and at least a substantial proportion of the diisoamyl ether at a temperature of from 15.degree. to 50.degree. C. during a period of from 0.7 to 2.5 hours to produce a precipitate of TiCl.sub.3, and thereafter converting the precipitate into active TiCl.sub.3 by heating at a temperature of from 80.degree. to 110.degree. C. during at least 30 minutes. The active TiCl.sub.3, when combined with a conventional organoaluminum cocatalyst, provides a stereospecific catalyst for the polymerization of alpha monoolefins having high activity, good morphology and good stereospecificity.
A process for the catalytic polymerization of propylene with a Ziegler/Natta type catalyst, comprising contacting propylene with a catalyst comprising an active TiCl.sub.3 catalyst component prepared by reducing TiCl.sub.4 with an aluminum trihydrocarbyl compound in a molar ratio of Ti:Al of 2.7:1 to 4.0:1 in the presence of diisoamyl ether and a hydrocarbon solvent by gradually adding TiCl.sub.4 to the aluminum trihydrocarbyl compound and at least a substantial proportion of the diisoamyl ether at a temperature of from 15.degree. to 50.degree. C. during a period of from 0.7 to 2.5 hours to produce a precipitate of TiCl.sub.3, and thereafter converting said precipitate into active TiCl.sub.3 by heating at a temperature of from 80.degree. to 110.degree. C. during at least 30 minutes.
Dependencies are inferred from the claim text.