| 摘要 |
A syndiotactic polyolefin which is obtained in high yield by polymerising or copolymerising an olefin of the formula R<a>-CH=CH-R<b> in the presence of a catalyst comprising a metallocene of the formula I <IMAGE> in which M<1> 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 very high syndiotacticity. Mouldings produced from the polymer have high transparency, flexibility and tear strength and excellent surface gloss. |
