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US 2021/0197133 A1Published application
Porous membrane
AssigneeAsahi Kasei Medical Co., Ltd.
InventorsYuzo KAYAMA, Masayasu KOMURO, Tetsuya HAMASAKI
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Abstract
A porous membrane containing a hydrophobic polymer and a water-insoluble hydrophilic polymer, the porous membrane having a dense layer in the downstream portion of filtration in the membrane, having a gradient asymmetric structure in which the average pore diameter of fine pores increases from the downstream portion of filtration toward the upstream portion of filtration, and having a gradient index of the average pore diameter from the dense layer to the coarse layer of 0.5 to 12.0.
Claims15
A porous membrane containing:
- a hydrophobic polymer;
- and
- a water-insoluble hydrophilic polymer, the porous membrane having:
- a dense layer in a downstream portion of filtration in the membrane;
- a gradient asymmetric structure wherein an average pore diameter of fine pores increases from the downstream portion of filtration toward an upstream portion of filtration;
- and
- a gradient index of the average pore diameter from the dense layer to a coarse layer of 0.5 to 12.0.
4 more elements
Dependencies are inferred from the claim text.