Metallocene capable of being used for the process for the preparation of a syndiotactic polyolefin
AssigneeBasell Polyolefine GmbH
InventorsAndreas Winter, Jürgen Rohrmann, Martin Antberg, Volker Dolle, Walter Spaleck
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Abstract
A syndiotactic polyolefin is obtained in a high yield by polymerization or copolymerization of an olefin of the formula Ra—CH═CH—Rb in the presence of a catalyst consisting of a metallocene of the formula I in which M1 is titanium, zirconium, vanadium, niobium or tantalum, and an aluminoxane. This polyolefin has a very high molecular weight, a very narrow molecular weight distribution and a very high syndiotactic index. Shaped articles produced from the polymer are distinguished by a high transparency, flexibility, tear resistance and an excellent surface gloss.
Claims2
A metallocene which is selected from the group consisting of (arylalkylidene)(9-fluorenyl)(cyclopentadienyl)zirconium dichloride and (diarylmethylene)(9-fluorenyl)(cyclopentadienyl)zirconium dichloride in which aryl represents an aryl group having 6-10 carbon atoms.
Dependencies are inferred from the claim text.