It is an object of the present invention to provide a composite semipermeable membrane having an excellent resistance property to contamination, particularly an excellent resistance property to microbial contamination, and a water treatment method using the composite semipermeable membrane. The present invention relates to a composite semipermeable membrane comprising a skin layer formed on the surface of a porous support and containing a polyamide-based resin obtained by reacting a polyfunctional amine component with a polyfunctional acid halide component, wherein an antibacterial layer containing a silver-based antibacterial agent and a polymer component is formed on the skin layer directly or with other layer interposed therebetween, and the weight ratio between the silver-based antibacterial agent and the polymer component in the antibacterial layer is 55:45 to 95:5 (silver-based antibacterial agent:polymer component).

Claims

14 · 1 independent · depth 3

14 granted claims

›1.independentA composite semipermeable membrane comprising a skin layer formed on the surface of a porous support and containing a polyamide-based resin obtained b…+13

›2.↳ 1The composite semipermeable membrane according to claim 1, wherein the silver-based antibacterial agent is a supported material containing a silver io…d2+2

›3.↳ 1The composite semipermeable membrane according to claim 1, wherein the silver-based antibacterial agent has an average particle diameter of 1.5 μm or …d2

›4.↳ 1The composite semipermeable membrane according to claim 1, wherein the silver-based antibacterial agent is heat-treated at 700° C. or higher.d2

›5.↳ 1The composite semipermeable membrane according to claim 1, wherein the silver content in the antibacterial layer is 30 mg/m2 or more.d2

›6.↳ 1The composite semipermeable membrane according to claim 1, wherein the polymer component is polyvinyl alcohol.d2+2

›9.↳ 1A water treatment method using the composite semipermeable membrane as claimed in claim 1.d2

›12.↳ 1The composite semipermeable membrane according to claim 1, wherein the silver-based antibacterial agent is selected from the group consisting of metal…d2

›13.↳ 1The composite semipermeable membrane according to claim 1, wherein the silver-based antibacterial agent is a supported material containing a silver io…d2

›14.↳ 1The composite semipermeable membrane according to claim 1, wherein the thickness of the antibacterial layer is 0.05 to 5 μm.d2

Classifications

8 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B01D61/00
B01D39/20

Section C — Chemistry; metallurgy

C02F1/28

USPC · US Patent Classification

210/500.25210/500.21210/500.38210/650210/500.42

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5.4 y

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Examiner

Katherine Zalasky

art unit 1777 · TC 1700

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Type	Document	Date
related publication	US 20100178489 A1	15 Jul 2010

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