US 12,030,997 B2
Method for producing water-absorbent resin particles
Ryota Wakabayashi, Himeji (JP); Shin-ichi Fujino, Himeji (JP); Mai Sato, Himeji (JP); Yoshihiro Shobo, Himeji (JP); Shin-ya Katsube, Himeji (JP); and Kunihiko Ishizaki, Himeji (JP)
Assigned to NIPPON SHOKUBAI CO., LTD., Osaka (JP)
Appl. No. 17/055,249
Filed by NIPPON SHOKUBAI CO., LTD., Osaka (JP)
PCT Filed May 15, 2019, PCT No. PCT/JP2019/019225
§ 371(c)(1), (2) Date Nov. 13, 2020,
PCT Pub. No. WO2019/221154, PCT Pub. Date Nov. 21, 2019.
Claims priority of application No. 2018-094742 (JP), filed on May 16, 2018.
Prior Publication US 2021/0269606 A1, Sep. 2, 2021
Int. Cl. C08J 3/24 (2006.01); A61F 13/53 (2006.01); B01J 20/26 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); C08F 20/06 (2006.01); C08J 3/12 (2006.01); F26B 17/32 (2006.01)
CPC C08J 3/245 (2013.01) [A61F 13/53 (2013.01); B01J 20/267 (2013.01); B01J 20/28004 (2013.01); B01J 20/28016 (2013.01); B01J 20/3021 (2013.01); B01J 20/3078 (2013.01); C08F 20/06 (2013.01); C08J 3/12 (2013.01); F26B 17/32 (2013.01); A61F 2013/530569 (2013.01); A61F 2013/530591 (2013.01); C08J 2333/02 (2013.01); C08J 2451/08 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method for producing water-absorbent resin particles, the method comprising:
a surface-crosslinking step of heating a mixture of a surface-crosslinking agent and a particulate dried polymer obtained with an acid group-containing unsaturated monomer as a main component, wherein
a moisture content of the particulate dried polymer is not greater than 15% by mass, and
a heating device is used in the surface-crosslinking step, wherein
the heating device includes a rotary container, a plurality of heating tubes that are located within the rotary container, extend in an axial direction of the rotary container, and rotate together with the rotary container, and at least one obstructive wall provided within the rotary container.