| abstract |
A process for rendering a porous membrane hydrophilic is disclosed, which comprises crosslinking at least one compound represented by the following general formula using an alkali at the fine pore surface of a porous material: n General Formula (I) n n (I) X.sub.1 --SO.sub.2 --L--SO.sub.2 --X.sub.2 n n wherein X 1 and X 2 , which may be the same or different, each represents --CH═CH 2 or --Ch 2 CH 2 Y, Y represents a group capable of being eliminated by a base in the form of HY, and L represents a divalent group which may be substituted. |