| abstract |
A gas separation composite membrane, containing a gas-permeable supporting layer and a gas separating layer containing a crosslinked polyimide resin over the gas-permeable supporting layer, in which the crosslinked polyimide resin has structure in which a polyimide compound is crosslinked through a specific crosslinking chain, the specific crosslinking chain has at least one kind of linking group selected from the group consisting of —NR a C(═O)—, —NR b C(═O)O—, —CH 2 OCH 2 —, —CH 2 SCH 2 —, —OC(═O)O—, —C(═O)O − N + (R c ) 3 —, —SO 3 − N + (R d ) 3 — and —PO 3 − N + (R e ) 3 —, and R a , R b , R c , R d and R e each independently represent a hydrogen atom or a substituent. |