Invention Grant
- Patent Title: Polyimide precursor solution, method for producing porous polyimide film, and porous polyimide film
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Application No.: US17403011Application Date: 2021-08-16
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Publication No.: US11958939B2Publication Date: 2024-04-16
- Inventor: Kosuke Nakada , Shigeru Seitoku , Takeshi Iwanaga , Tomoyo Okubo , Hajime Sugahara , Hidekazu Hirose
- Applicant: FUJIFILM Business Innovation Corp.
- Applicant Address: JP Tokyo
- Assignee: FUJIFILM Business Innovation Corp.
- Current Assignee: FUJIFILM Business Innovation Corp.
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JP 21026032 2021.02.22
- Main IPC: C08G73/10
- IPC: C08G73/10 ; C08J5/18 ; C08J9/26

Abstract:
A polyimide precursor solution contains: an aqueous solvent containing water; particles; and a polyimide precursor, wherein the polyimide precursor has a high molecular weight region A containing a high molecular weight side maximum value and a low molecular weight region B containing a low molecular weight side maximum value in an elution curve obtained by gel permeation chromatography, a weight average molecular weight in the high molecular weight region A is 50,000 or more, a weight average molecular weight in the low molecular weight region B is 10,000 or more and 30,000 or less, and a value of a/(a+b) is 0.60 or more and 0.98 or less in which a represents an area of the high molecular weight region A and b represents an area of the low molecular weight region B.
Public/Granted literature
- US20220267527A1 POLYIMIDE PRECURSOR SOLUTION, METHOD FOR PRODUCING POROUS POLYIMIDE FILM, AND POROUS POLYIMIDE FILM Public/Granted day:2022-08-25
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