| 摘要 |
PURPOSE:To obtain a gas permselective laminated body excellent in the stability of permeability during long-time use, by using a porous support having a specific range of a gas transmitting speed, porosity and selectivity. CONSTITUTION:A porous support wherein the K value represented by formula I is a range of 0.75-1 and the exhaustion rate of dextrane with MW of 200,000 is 70% or more is used. Further, this porous support must has gas permeability 50 times or more the permeability expected from the thickness of a gas permselective membrane. As the material of said support, there is no special limit and polyethylene, polypropylene, polycarbonate and polyvinyl chloride etc. are used. The surface pore size of the support is pref. 0.08mum or less and the void ratio is pref. 5-40%.
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