| 摘要 |
PURPOSE:To obtain a composite membrane prevented from the delamination of the membrane and support membrane thereof and excellent in separation permeability, by interposing an extremely thin membrane comprising a polyorganosiloxane/silphenylene copolymer between a porous support and an extremely thin membrane comprising a polymer having high gas separation capacity. CONSTITUTION:An extremely thin membrane C comprising a polyorganosiloxane/silphenylene copolymer having a repeating unit represented by formula is interposed between a porous support A and an extremely thin membrane B comprising a polymer having high gas separation capacity to form a gas separation composite membrane. The extremely thin membrane B pref. comprises poly (4-methylpenten-1) or polyvinyl trimethylsilane and the thickness thereof is 0.01-0.3mum. The n/m ratio of the constitutional unit of the extremely thin membrane C is 5-20 and the thickness thereof is pref. 0.01-0.3mum. |
