US 12,247,103 B2
Polyimide precursor solution, porous polyimide film, separator for secondary battery, and secondary battery
Kosaku Yoshimura, Kanagawa (JP); Yasunobu Kashima, Kanagawa (JP); and Takahiro Ishizuka, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Jan. 17, 2022, as Appl. No. 17/577,358.
Claims priority of application No. 2021-145585 (JP), filed on Sep. 7, 2021.
Prior Publication US 2023/0079844 A1, Mar. 16, 2023
Int. Cl. C08G 73/10 (2006.01); B29C 67/20 (2006.01); H01M 50/403 (2021.01); H01M 50/414 (2021.01); H01M 50/491 (2021.01); B29K 79/00 (2006.01); B29K 105/00 (2006.01)
CPC C08G 73/1032 (2013.01) [B29C 67/202 (2013.01); H01M 50/403 (2021.01); H01M 50/414 (2021.01); H01M 50/491 (2021.01); B29K 2079/08 (2013.01); B29K 2105/0002 (2013.01)] 17 Claims
 
1. A polyimide precursor solution comprising:
a polyimide precursor having a glass transition temperature Tg of equal to or higher than 300° C. after imidization;
an aqueous solvent containing water;
an organic amine compound; and
resin particles having a volume average particle size of 40 nm or more and 95 nm or less.