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US 12,337,286 B2Granted
Composite semipermeable membrane
AssigneeNitto Denko Corporation
InventorsTomotsugu Miyabe, Masamitsu Taguchi
Life of this patent
Estimating the term…
Abstract
A composite semipermeable membrane includes a porous support membrane, a separation functional layer containing a polyamide disposed on the porous support membrane, and a coating layer disposed on the separation functional layer, wherein a water contact angle of a surface of the coating layer is 40° or less, and a protein adsorption force of the surface of the coating layer is 0.4 nN or less.
Claims4
A composite semipermeable membrane comprising:
- a porous support membrane;
- a separation functional layer containing a polyamide disposed on the porous support membrane;
- and
- a coating layer disposed on the separation functional layer,
- wherein a water contact angle of a surface of the coating layer is 40° or less, and
- wherein a protein adsorption force of the surface of the coating layer is 0.4 nN or less wherein the coating layer contains an amphoteric ion hydrophilic polymer, wherein the amphoteric ion hydrophilic polymer is copolymerized with a first monomer represented by the following formular (1) and second monomer represented by the following formula (2):
- In the formulas (1) and (2), R1 represents a hydrogen atom or a methyl group;
- R2 represents an alkylene group having 1 to 6 carbons;
- R3 and R4 each independently represent an alkyl group having 1 to 4 carbons;
- R5 represents an alkylene group having 1 to 4 carbons;
- X represent an alkoxysilyl group-containing group, or an imide group-containing group;
- and Y represents an oxygen atom or a —NH— group.
9 more elements
A method of manufacturing a composite semipermeable membrane comprising:
- forming a porous support membrane;
- forming a separation functional layer containing a polyamide on the porous support membrane;
- and
- forming a coating layer on the separation functional layer,
- wherein a water contact angle of a surface of the coating layer is 40° or less, and
- wherein a protein adsorption force of the surface of the coating layer is 0.4 nN or less wherein the coating layer contains an amphoteric ion hydrophilic polymer, wherein the amphoteric ion hydrophilic polymer is copolymerized with a first monomer represented by the following formular (1) and second monomer represented by the following formula (2):
- In the formulas (1) and (2), R1 represents a hydrogen atom or a methyl group;
- R2 represents an alkylene group having 1 to 6 carbons;
- R3 and R4 each independently represent an alkyl group having 1 to 4 carbons;
- R5 represents an alkylene group having 1 to 4 carbons;
- X represent an alkoxysilyl group-containing group, or an imide group-containing group;
- and Y represents an oxygen atom or a —NH— group.
9 more elements
Dependencies are inferred from the claim text.