| 摘要 |
A gas permselective membrane comprising a porous support having fine pores continuous in the thickness direction and a layer of a polymer laminated on the surface of said porous support, said polymer comprising silarylenesiloxane structural units represented by the following general formula <CHEM> wherein R stands for an alkyl group having 1 to 10 carbon atoms, a phenyl group, a nucleus-substituted phenyl group having 6 to 20 carbon atoms, or a substituted alkyl group having 1 to 10 carbon atoms, Ar stands for <CHEM> in which X is -O-, -S-, -SO2-, -@- or -CH2-, or <CHEM> and m is a number of from 5 to 8000, and diorganosiloxane structural units represented by the following general formula <CHEM> wherein R1 and R2 each independently stand for an alkyl group having 1 to 10 carbon atoms, a phenyl group, a nucleus-substituted phenyl group having 6 to 20 carbon atoms, a substituted alkyl group having 1 to 10 carbon atoms, a vinyl group, or an allyl group, and n is a number of from 0 to 2000, with the proviso that n/m is in the range of 0 </= n/m </= 50, wherein the average pore size of said porous membrane is 0.001 to 1 mu m and the thickness of said polymer layer is 0.01 to 1 mu m. This permselective membrane has a high oxygen-separating capacity and is excellent in respect to pressure resistance and resistance to pinhole formation and, therefore, is valuable for obtaining from air oxygen-rich air-containing oxygen at a high concentration and at a low cost. |
