| 摘要 |
Copolymerisation of propylene with small amounts of other olefins in the presence of a catalyst comprising a metallocene of the formula I <IMAGE> in which M<1> is titanium, zirconium, hafnium, vanadium, niobium or tantalum, and an aluminoxane gives a syndiotactic propylene copolymer in high yield. This copolymer has a very high molecular weight, a very narrow molecular weight distribution, very high syndiotacticity, a favourably low melting point and a rubber-like behaviour. Mouldings produced from the polymer have high transparency, flexibility and tear strength. Their principal area of application is packaging of all types. |
