| 摘要 |
PROBLEM TO BE SOLVED: To provide a moisture permeable filter medium which is made by laminating an air permeable sheet on a PTFE porous membrane and where the reduction of moisture permeability is suppressed in comparison with the moisture permeability of the PTFE porous membrane itself.SOLUTION: A moisture permeable filter medium is constituted: by laminating a hydrophobic layer having hydrophobic property and a hydrophilic layer having hydrophilic property; with a PTFE porous membrane where any one of the hydrophobic layer and the hydrophilic layer is formed by using PTFE; and with an air permeable sheet where any other of the hydrophobic layer and the hydrophilic layer has air permeability. |
