Patent ID: 9248413
Filing Date: 2016-02-02
CPC Classification: B01D,C08G

Claim Text:
1. A gas separation composite membrane, comprising: a gas-permeable supporting layer; and a gas separating layer containing a crosslinked polyimide resin over the gas-permeable supporting layer, wherein the crosslinked polyimide resin is formed by a polyimide compound being crosslinked by a radically crosslinkable functional group thereof, wherein a ratio [η] of a crosslinked site to an imide group of the polyimide compound (the number of crosslinked sites/the number of imide groups) in the crosslinked polyimide resin is from 0.01 to 0.1, wherein the polyimide compound contains a repeating unit represented by Formula (I): wherein R represents a structure part containing at least one hydrocarbon ring having 5 to 12 carbon atoms, wherein the polyimide compound further contains at least one kind of repeating unit represented by Formula (II-a) or (II-b), and at least one kind of repeating unit represented by Formula (III-a) or (III-b), and wherein R of the repeating unit represented by Formula (I) is a group of atoms selected from the group consisting of the groups represented by any one of Formulas (I-a) to (I-g): wherein, in Formulas (I-a) to (I-g), X wherein, in Formulas (II-a) and (II-b), R wherein, in Formulas (III-a) and (III-b), R