US 12,227,623 B2
Water-absorbing hydrogel and method for producing the same
Yoshihiro Kudo, Funabashi (JP)
Assigned to NISSAN CHEMICAL CORPORATION, Tokyo (JP)
Appl. No. 16/495,020
Filed by NISSAN CHEMICAL CORPORATION, Tokyo (JP)
PCT Filed Mar. 14, 2018, PCT No. PCT/JP2018/009984
§ 371(c)(1), (2) Date Sep. 17, 2019,
PCT Pub. No. WO2018/168933, PCT Pub. Date Sep. 20, 2018.
Claims priority of application No. 2017-053503 (JP), filed on Mar. 17, 2017.
Prior Publication US 2020/0095384 A1, Mar. 26, 2020
Int. Cl. C08J 3/075 (2006.01); C08K 3/013 (2018.01); C08K 3/36 (2006.01); C08K 7/20 (2006.01)
CPC C08J 3/075 (2013.01) [C08K 3/013 (2018.01); C08K 3/36 (2013.01); C08K 7/20 (2013.01); C08J 2333/08 (2013.01); C08J 2341/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for producing a sheet-shaped gel comprising:
a formation step of forming a sheet-shaped gel comprising a water-soluble organic polymer (A), a silicate (B), a dispersant (C) for the silicate, a water-absorbing polymer (D), wherein the water-absorbing polymer (D) is at least one selected from the group consisting of a crosslinked polyacrylate and a crosslinked polyvinyl sulfonate, and a content of the water-absorbing polymer (D) in the sheet-shaped gel is 0.01 to 20% by mass, relative to 100% by mass of the sheet-shaped gel, a reinforcing material (E), wherein the reinforcing material (E) is a fiber, and a content of the fiber in the sheet-shaped gel is 0.5 to 10% by mass, relative to 100% by mass of the sheet-shaped gel, and a solvent (F) consisting of water, wherein a content of the solvent in the sheet-shaped gel is 70-95% by mass, relative to 100% by mass of the sheet-shaped gel; and
performing a solvent removal step of removing a portion or all of the solvent in the sheet-shaped gel to adjust the content of the solvent in the sheet-shaped gel to less than 50% by mass.