PURPOSE: To provide a selective gas-permeable membrane having mechanical strengths and a high permeation coefficient comprising polyorganosiloxane obtained by reacting a polymer between a phenol compound and a phenol ether compound with a poly-disubstituted siloxane.
CONSTITUTION: A phenol compound such as phenol or cresol and a diphenylene ether compound such as diphenyl ether or polyphenylene ether with a low polymerization degree are polymerized through methylene chains by using formaldehyde to obtain an addition polymer having an average MW of about 1,000W 20,000. This addition polymer is reacted with an α,ω-difunctional polymethylsiloxane shown by the general formula having terminal groups X reactive with the hydroxyl group of said polymer (wherein X is a halogen atoms or a functional group such s hydroxyl group, R and R' are each a hydrogen atom or a group such as a methyl group) to obtain polyorganosiloxane having a crosslinked structure and soluble in an org. solvent.
SAITOU YUKIHIRO
ITOU YOSHIMASA
