	US 11,680,140 B2
	Particle-dispersed polyimide precursor solution, method for producing porous polyimide film, and porous polyimide film
Hajime Sugahara, Kanagawa (JP); Hidekazu Hirose, Kanagawa (JP); Kosaku Yoshimura, Kanagawa (JP); Tomoya Sasaki, Kanagawa (JP); Yasunobu Kashima, Kanagawa (JP); Kosuke Nakada, Kanagawa (JP); and Tomoyo Okubo, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Jan. 11, 2021, as Appl. No. 17/146,436.
Claims priority of application No. JP2020-148427 (JP), filed on Sep. 3, 2020.
Prior Publication US 2022/0064379 A1, Mar. 3, 2022
Int. Cl. C08G 73/10 (2006.01); C08J 9/26 (2006.01)

CPC C08G 73/1032 (2013.01) [C08J 9/26 (2013.01); C08J 2379/08 (2013.01)]

15 Claims

1. A particle-dispersed polyimide precursor solution, comprising:

a polyimide precursor consisting of a polymer of a tetracarboxylic dianhydride and a diamine containing a fluorene-based diamine having a fluorene skeleton;

particles; and

an aqueous solvent containing water,

wherein a total content of a structure derived from the fluorene-based diamine is 1% by mass or more and 50% by mass or less with respect to the particles.