| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polyvinylidene fluoride-based multiple membrane having good capability of removing viruses, pure water permeation performance, and physical strength in a simple process in order to stabilize the water quality of permeation water through improvement of separation functions to a greater extent than conventional water treatment membranes. Ž<P>SOLUTION: The polyvinylidene fluoride-based multiple membrane contains 50 wt.% or more and 88 wt.% or less of a polyvinylidene fluoride-based resin with viscosity of 2,500 Pa s or more and 12 wt.% or more and 50 wt.% or less of cellulose ester and having a three-dimensional network structure with an average bore size of 0.01 μm or more and 1 μm or less and a thickness of 5 μm or more and 100 μm or less, wherein the multiple membrane is formed via lamination of a separation function layer having no macrovoid of substantially 5 μm or more on a polyvinylidene fluoride-based supporting membrane having a spherical structure with an average diameter of 0.1 μm or more and 5 μm or less. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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