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US 12,486,387 B2Granted
Polymer composition blend and membranes made therefrom
AssigneeCelanese International Corporation
InventorsFangfang Tao, Christian Ohm, Yingying Sun, David Ditter
Life of this patent
Estimating the term…
Abstract
A polymer composition for producing gel extruded articles is described. The polymer composition contains at least three different polyethylene polymers, namely a lower molecular weight polyethylene polymer, a mid-range molecular weight polyethylene polymer, and a high molecular weight polyethylene polymer. Combining the different polyethylene polymers in different ratios can optimize not only mechanical properties but improve processing.
Claims19
The polymer composition for producing gel extruded articles comprising:
- a plasticizer;
- and
- polymer particles comprising a first polyethylene polymer, a second polyethylene polymer, and a third polyethylene polymer, the first polyethylene polymer having a molecular weight of from about 300,000 g/mol to about 1 million g/mol, the first polyethylene polymer being present in an amount of from about 3% to about 25% by weight of the polymer particles, the second polyethylene polymer having a molecular weight of from about 1 million g/mol to about 2.9 million g/mol, the second polyethylene polymer being present in an amount of from about 25% to about 85% by weight of the polymer particles, the third polyethylene polymer having a molecular weight of from about 2 million g/mol to about 10 million g/mol, the third polyethylene polymer being present in an amount of from about 5% to about 48% by weight of the polymer particles.
The porous membrane comprising:
- a polymer blend comprising a first polyethylene polymer, a second polyethylene polymer, and a third polyethylene polymer, the first polyethylene polymer having a molecular weight of from about 400,000 g/mol to about 1 million g/mol, the first polyethylene polymer being present in an amount of from about 3% to about 18% by weight, the second polyethylene polymer having a molecular weight of from about 1.1 million g/mol to about 2.9 million g/mol, the second polyethylene polymer being present in an amount of from about 34% to about 85% by weight, the third polyethylene polymer having a molecular weight of from about 3 million g/mol to about 10 million g/mol, the third polyethylene polymer being present in an amount of from about 12% to about 48% by weight, the porous membrane having a tensile strength in a machine direction of greater than about 155 MPa.
Dependencies are inferred from the claim text.