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US 2020/0266409 A1Published application
Porous polyimide film and battery
AssigneeFuji Xerox Co., Ltd.
InventorsKosaku YOSHIMURA, Yasunobu KASHIMA, Hajime SUGAHARA, Hidekazu HIROSE
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Abstract
A porous polyimide film has an acid value within a range of 7 mgKOH/g to 20 mgKOH/g determined by acid-base titration, contains a metal group including alkali metals excluding Li, an alkaline earth metals, and silicon at a total content of 100 ppm or less relative to the porous polyimide film, and has a moisture absorption ratio of 0.5% or less.
Claims14
A porous polyimide film comprising:
- the porous polyimide film having an acid value within a range of 7 mgKOH/g to 20 mgKOH/g determined by acid-base titration, containing a metal group including alkali metals excluding Li, alkaline earth metals, and silicon at a total content of 100 ppm or less relative to the porous polyimide film, and having a moisture absorption ratio of 0.5% or less.
A porous polyimide film,
- wherein a molar ratio (structural unit derived from tetracarboxylic dianhydride/structural unit derived from diamine) of a structural unit derived from tetracarboxylic dianhydride to a structural unit derived from diamine, both constituting a polyimide resin of the porous polyimide film, is within a range of 1.00 to 1.15, a total content of a metal group including alkali metals excluding Li, alkaline earth metals, and silicon is 100 ppm or less relative to the porous polyimide film, and a moisture absorption ratio of the porous polyimide film is 0.5% or less.
Dependencies are inferred from the claim text.