Polyethylene compositions, wire and cables, and methods for making the same
AssigneeExxonMobil Chemical Patents Inc.
InventorsAntonios K. Doufas, Giriprasath Gururajan, Adam Struppeck, Christopher S. Breiner
Life of this patent
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Abstract
Polyethylene compositions described herein have a density from about 0.900 g/cm3 to about 0.950 g/cm3, a MI (I2, 190° C., 2.16 kg) from about 0.1 g/10 min to about 10 g/10 min, an MIR (I21/I2) from about 25 to about 80, an Mz greater than or equal to about 150,000 g/mol, and either an Mz/Mn ratio greater than or equal to about 8.0, an Mz/Mw ratio greater than or equal to about 2.4, or an (I2*Mz/Mn) from about 3 to about 100. The polyethylene compositions are useful in wire and cable, tape, and filament applications, and could be produced using a gas phase or slurry phase, preferably gas phase, polymerization process.
Claims15
A wire or a cable comprising a polyethylene composition having a density from 0.910 to 0.930 g/cm3, a MI (I2, 190° C., 2.16 kg) from 2 to 6 g/10 min, an MIR (I21/I2) from 25 to 50, an Mz, greater than or equal to about 150,000 g/mol, and either an Mz/Mn ratio greater than or equal to about 8.0, an Mz/Mw ratio greater than or equal to about 2.4, or an (I2*Mz/Mn) from about 3 to about 100,
- wherein the polyethylene composition comprises C3 to C10 carbon alpha-olefin comonomer derived units, has a Broad Orthogonal Comonomer Distribution (BOCD), and is produced using a single site hafnium metallocene catalyst system.
A method for producing a wire or a cable including at least one layer, the method comprising:
- (a) polymerizing ethylene in the presence of a metallocene catalyst system in a gas phase reactor with at least one comonomer of a C3 to C10 alpha-olefin to produce a polyethylene composition having a density from 0.910 to 0.930 g/cm3 about 0.900 g/cm3 to about 0.950 g/cm3, (I21/I2) from 25 to 50, an Mz greater than or equal to about 150,000 g/mol, and either an Mz/Mn ratio greater than or equal to about 8.0, an Mz/Mw ratio greater than or equal to about 2.4, or an (I2*Mz/Mn) between about 3 and about 100, wherein the polyethylene composition comprises C3 to C10 carbon alpha-olefin comonomer derived units, has a Broad Orthogonal Comonomer Distribution (BOCD), and is produced using a single site hafnium metallocene catalyst system;
- and
- (b) extruding the polyethylene composition to produce the at least one layer.
Dependencies are inferred from the claim text.