GAS SEPARATION FILTER AND ITS PRODUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a gas separating filter hardly losing a separation function even for a mixed gas containing water.SOLUTION: The gas separating filter, which is a gas separation membrane separating a prescribed gas from a mixed gas, comprises: a porous support layer; a medium layer formed on the porous support layer and having a pore size smaller than that of the porous support layer; and a separation layer formed on the medium layer and having a pore size smaller than that of the medium layer; and in which the medium layer is a porous body having a hydrophobic group.SELECTED DRAWING: Figure 1