Polymers
AssigneeIneos Europe AG
InventorsGaelle Pannier, Choon Kooi Chai
Life of this patent
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Abstract
Copolymers of ethylene and α-olefins 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.) normalized Dow Rheology Index (DRI), [DRI/MI2] in the range 3-20. The copolymers may be prepared using catalyst systems containing 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.
Claims29
A copolymer of ethylene and an α-olefin said copolymer 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;
- wherein the copolymer exhibits specific rheological behavior and processability characteristics that satisfy the following equation in relating the Dow Rheology Index (DRI) and Shear Thinning Index, SHI (2.1/210),
- SHI (2.1/210)≦[0.2351×DRI]+C,
- with C having a value of 3.4.
Dependencies are inferred from the claim text.