Polyimide, a method for manufacturing the same, a gas separation membrane using the polyimide and a method for manufacturing the same
AssigneeNitto Denko Corporation
InventorMasatoshi Maeda
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Abstract
A novel polyimide having a repeating structure unit expressed by the following general formula (1), a method for manufacturing the same, a gas separation membrane using the novel polyimide and the method for manufacturing the same. The gas separation membrane using this polyimide is excellent in gas permeable performance and separation selectivity for gas, for example, carbon dioxide, methane, etc. General Formula (1) ##STR1## where R denotes a quadrivalent organic group.
Claims34
A polyimide having a repeating structure unit expressed by the following general formula (1):
- General Formula (1) ##STR21## where R denotes a quadrivalent organic group.
A method for manufacturing a polyimide having a repeating structure unit expressed by the following general formula (7) by condensation polymerizing a tetracarboxylic acid dianhydride expressed by the following general formula (5) and diamine expressed by the following general formula (6):
- General Formula (5) ##STR25## where R denotes a quadrivalent organic group;
- General Formula (6) ##STR26##
- General Formula (7) ##STR27## where R denotes a quadrivalent organic group.
A gas separation membrane having a repeating structure unit expressed by the following general formula (11):
- General Formula (11) ##STR31## where R denotes a quadrivalent organic group.
A method for manufacturing a gas separation membrane, which comprises dissolving polyimide having a repeating structure unit expressed by the following general formula (15) in a polar solvent;
- and forming at least one membrane selected from the group consisting of a flat membrane and a hollow fiber membrane
- General Formula (15) ##STR35## where R denotes a quadrivalent organic group.
Dependencies are inferred from the claim text.