Polyethylene composition
First Claim
1. A process to produce ethylene copolymer comprising:
- i) contacting, in the gas phase or slurry phase, ethylene and one or more C3 to C20 comonomers, with a catalyst system comprising a reaction product of fluorided silica support, alkylalumoxane activator and at least two metallocene catalyst compounds, where the first metallocene catalyst compound is a bridged monocyclopentadienyl group 4 transition metal compound and the second metallocene catalyst compound is a biscyclopentadientyl group 4 transition metal compound where the fluorided silica support has not been calcined at a temperature of 400°
C. or more; and
ii) obtaining an ethylene polymer having;
1) at least 50 mol % ethylene;
2) a reversed comonomer index, mol %, (RCI,m) of 85 or more;
3) a comonomer distribution ratio-2 (CDR-2,m) of the mole percent comonomer at the z average molecular weight divided by the mole percent comonomer at the weight average molecular weight plus the number average molecular weight divided by 2 ([% comonomer at Mz]/[% comonomer at ((Mw+Mn)/2)] as determined by gel permeation chromotography (GPC) of 2.3 or more; and
4) a density of 0.91 g/cc or more.
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Accused Products
Abstract
This invention relates to ethylene polymers obtained using a catalyst system comprising fluorided silica, alkylalumoxane activator and at least two metallocene catalyst compounds (a bridged monocyclopentadienyl group 4 transition metal compound and a biscyclopentadientyl group 4 transition metal compound), where the fluorided support has not been calcined at a temperature of 400° C. or more, and is preferably produced using a wet mixing method, such as an aqueous method. The ethylene polymers have: 1) at least 50 mol % ethylene; 2) a reversed comonomer index, mol %, (RCI,m) of 85 or more; 3) a Comonomer Distribution Ratio-2 (CDR-2,m) of the percent comonomer at the z average molecular weight divided by the percent comonomer at the weight average molecular weight plus the number average molecular weight divided by 2 ([% comonomer at Mz]/[% comonomer at ((Mw+Mn)/2)] as determined by GPC of 2.3 or more; and 4) a density of 0.91 g/cc or more.
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Citations
25 Claims
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1. A process to produce ethylene copolymer comprising:
- i) contacting, in the gas phase or slurry phase, ethylene and one or more C3 to C20 comonomers, with a catalyst system comprising a reaction product of fluorided silica support, alkylalumoxane activator and at least two metallocene catalyst compounds, where the first metallocene catalyst compound is a bridged monocyclopentadienyl group 4 transition metal compound and the second metallocene catalyst compound is a biscyclopentadientyl group 4 transition metal compound where the fluorided silica support has not been calcined at a temperature of 400°
C. or more; and
ii) obtaining an ethylene polymer having;1) at least 50 mol % ethylene; 2) a reversed comonomer index, mol %, (RCI,m) of 85 or more; 3) a comonomer distribution ratio-2 (CDR-2,m) of the mole percent comonomer at the z average molecular weight divided by the mole percent comonomer at the weight average molecular weight plus the number average molecular weight divided by 2 ([% comonomer at Mz]/[% comonomer at ((Mw+Mn)/2)] as determined by gel permeation chromotography (GPC) of 2.3 or more; and 4) a density of 0.91 g/cc or more. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- i) contacting, in the gas phase or slurry phase, ethylene and one or more C3 to C20 comonomers, with a catalyst system comprising a reaction product of fluorided silica support, alkylalumoxane activator and at least two metallocene catalyst compounds, where the first metallocene catalyst compound is a bridged monocyclopentadienyl group 4 transition metal compound and the second metallocene catalyst compound is a biscyclopentadientyl group 4 transition metal compound where the fluorided silica support has not been calcined at a temperature of 400°
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16. An ethylene polymer having:
- 1) a density of 0.910 g/cc or more,
2) an ethylene content of 50 mol % or more, based upon the weight of the polymer;
3) a reversed comonomer index, mol %, (RCI,m) of 85 or more;
4) a comonomer distribution ratio-2 (CDR-2,m) of the mole percent comonomer at the z average molecular weight divided by the mole percent comonomer at the weight average molecular weight plus the number average molecular weight divided by 2 ([% mole comonomer at Mz]/[% mole comonomer at ((Mw+Mn)/2)] as determined by gel permeation chromotography (GPC) of 2.3 or more. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
- 1) a density of 0.910 g/cc or more,
Specification