| 摘要 |
PROBLEM TO BE SOLVED: To obtain a porous separation membrane having high PEG stop-off performance and high water permeating rate, and an excellent composite reverse osmosis membrane using the same as a supporting membrane. SOLUTION: The porous separation membrane has 10-90% polyethylene glycol stop-off ratio in a prescribed measuring condition of the polyethylene glycol stop-off ratio and >=5 m3/m2/D pure water permeating rate at 1 kgf/cm2 evaluating pressure and 25 deg.C. The composite reverse osmosis membrane is obtained by using the porous separation membrane as the supporting membrane and forming a skin layer composed of a synthetic polymer thereon.
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