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US 2026/0022236 A1Published application
Polymer Composition Blend and Membranes Made Therefrom
AssigneeCelanese International Corporation
InventorsFangfang Tao, Christian Ohm, Yingying Sun, David Ditter
Life of this patent
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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
A polymer composition for producing gel extruded articles comprising:
- a plasticizer;
- and
- polymer particles comprising a polyethylene polymer having a molecular weight of from about 1 million g/mol to about 2.9 million g/mol and being present in an amount greater than about 62% by weight of the polymer particles, the polymer particles further comprising a polyethylene polymer having a molecular weight of from about 2 million g/mol to about 5.5 million g/mol and being present in an amount of from about 5% to about 48% by weight of the polymer particles.
A porous membrane comprising:
- a polymer blend comprising a polyethylene polymer having a molecular weight of from about 1.1 million g/mol to about 2.9 million g/mol being present in the membrane in an amount greater than about 62% by weight combined with a polyethylene polymer having a molecular weight of from about 2 million g/mol to about 5.5 million g/mol and being present in the membrane in an amount of from about 5% to about 45% by weight, the porous membrane having a tensile strength in a machine direction of greater than about 155 MPa and having a thickness of less than about 8 microns.
Dependencies are inferred from the claim text.