| abstract |
PURPOSE: To obtain a gas separation composite membrane holding good gas permselectivity and excellent gas permeability, by laminating a siloxane compound and a polymer having a gas separation property to a porous support layer. n CONSTITUTION: A porous support layer has a thickness of 0.001W10mm and air transmissivity of 1W100m 3 /m 2 hr 0.1atm.(25°C). A membrane of a siloxane compound (with a thickness of 100W2,000Å) is formed to this support layer by a casting method on water, an ultrafiltration method and a plasma polymeri zation method and an extremely thin film with a thickness of 50W1,000Å having a gas separation property comprising a substituted acetylene polymer, a vinyl organosilane polymer, an α-olefin polymer, a cellulose polymer is further formed onto the siloxane compound membrane. n COPYRIGHT: (C)1986,JPO&Japio |