POROUS POLYIMIDE-BASED FILM

• Main Authors: YOSHINO FUMIKO, MORIKITA TATSUYA, SHIBATA KENTA, ECHIGO YOSHIAKI, YAMADA MUNENORI
• Format: Patent
• Language: English; Japanese
• Published: 17.10.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEMICONDUCTOR DEVICES; SEPARATION; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

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 【課題】濾過膜等として好適に用いることができる、高い透過特性と極小の平均孔径とを有し、かつ、比引張弾性率が高い多孔質ポリイミド（ＰＩ）系フィルムの提供。【解決手段】以下を特徴とする多孔質ポリイミド系フィルム。１） ガーレ値が１０００秒以下である。２） ＢＥＴ法による平均孔径が２０ｎｍ以下である。３） 比引張弾性率が１０００ｍ／ｓｅｃ以上である。ＢＥＴ法による平均孔径とは、この孔径領域における体積基準の平均孔径をいう。【選択図】なし