| 摘要 |
Novel copolymers of ethylene and alpha-olefins are provided having (a) a density in the range 0.900 - 0.940 g/cm3, (b) a melt index MI2 (2.16 kg, 190°C) in the range 0.01 - 50 g/10 min, (c) a molecular weight distribution (Mw/Mn, by conventional GPC) in the range 2.0 - 4.5, (d) a comonomer partition factor, Cpf> 1, and (e) a melt index MI2 (2.16 kg, 190°C) normalised Dow Rheology Index (DRI), [DRI/MI2] in the range 3 - 20. The novel copolymers may suitably be prepared by use of catalyst systems comprising activating supports. The copolymers are suitably prepared in the gas phase preferably in a single reactor. The copolymers exhibit unique properties in particular with respect to their rheology. |
