| 摘要 |
Problem to be Solved: To provide a gas separation membrane having an excellent performance balance (balance between gas permeation performance and gas separation ability) as a gas separation membrane. Solution: A gas separation membrane comprising a porous support member and a gas separating resin layer formed on the porous support member, wherein the porous support member has a mode diameter as measured by a mercury porosimeter of from 0.005μm to 0.3μm, and a pore size distribution index as measured by the mercury porosimeter of from 1 to 15.
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