US 12,261,335 B2
Liquid composition, polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte fuel cell
Susumu Saito, Tokyo (JP); Takumi Okuyama, Tokyo (JP); and Hiroyuki Watabe, Tokyo (JP)
Assigned to AGC Inc., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on May 28, 2021, as Appl. No. 17/333,682.
Application 17/333,682 is a continuation of application No. PCT/JP2019/047934, filed on Dec. 6, 2019.
Claims priority of application No. 2018-230348 (JP), filed on Dec. 7, 2018.
Prior Publication US 2021/0296673 A1, Sep. 23, 2021
Int. Cl. H01M 8/1039 (2016.01); C08K 3/22 (2006.01); C08L 27/12 (2006.01); H01M 8/1051 (2016.01); H01M 8/1067 (2016.01)
CPC H01M 8/1039 (2013.01) [C08K 3/22 (2013.01); C08L 27/12 (2013.01); H01M 8/1051 (2013.01); H01M 8/1067 (2013.01); C08K 2003/2213 (2013.01); C08K 2201/001 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A liquid composition comprising:
 a liquid medium,
 a sulfonic acid group-containing fluorocarbon polymer, and
 a hardly soluble cerium compound,
wherein the ion exchange capacity of the sulfonic acid group-containing fluorocarbon polymer is from 1.36 to 2.50 meq/g dry resin,
the average particle size of the hardly soluble cerium compound is from 1 nm to 3,000 nm,
the ratio of the total number of moles of cerium atoms in the hardly soluble cerium compound to the total number of moles of sulfonic acid groups contained in the sulfonic acid group-containing fluorocarbon polymer is from 0.001 to 0.3, and
the sulfonic acid group-containing fluorocarbon polymer has units represented by the following formula u1:

OG Complex Work Unit Chemistry
where RF1 and RF2 are each a C1-3 perfluoroalkylene group, Z+ is H+, a monovalent metal ion or an ammonium ion in which at least one hydrogen atom may be substituted by a hydrocarbon group, and RF1 and RF2 may be the same or different.