Selective gas permeation membranes and method of manufacturing them.

摘要

The present invention provides a selective gas permeation membrane in which the inner walls of pores in a porous substrated are coated with organosiloxane polymer and voids are formed in the central portion of the pores. The selective gas permeation membrane is produced by impregnating the porous substrate with the siloxane polymer followed by a crosslinking treatment to such an extent that the penetration degree of the crosslinked organosiloxane polymer reaches a range from 20 to 150 and then removing the crosslinked organosiloxane polymer undergoing insufficient crosslinking by means of a solvent.