Method for manufacturing porous polyimide films
By applying a polyamide-imide solution and inducing phase separation, the method produces porous films with high permeability, small pores, and high rigidity, addressing the deformation issue in existing PI-based films.
JP7887159B2Active Publication Date: 2026-07-09UNITIKA LTD
Patent Information
- Application Number
- JP2022059683
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2021-04-02
- Filing Date
- 2022-03-31
- Publication Date
- 2026-07-09
- Estimated Expiration
- 2042-03-31
Smart Images
Figure 0007887159000001
Abstract
To provide a porous polyimide (PI)-based film that has a high permeation property, a very small average pore size, and a high specific tensile modulus, which can be suitably used as a filtration membrane, etc.SOLUTION: Provided is a porous polyimide-based film that is characterized by the followings. 1) The Gurley value is 1000 seconds or less. 2) The average pore size by BET method is 20 nm or less. 3) The specific tensile modulus is 1000 m / sec or more. The average pore size according to the BET method refers to a volume-based average pore size in this pore size region.SELECTED DRAWING: None
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Citation Information
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