Title:
METHOD FOR PRODUCING WATER ABSORBENT RESIN PARTICLES
Document Type and Number:
WIPO Patent Application WO/2022/181452
Kind Code:
A1
Abstract:
The present invention relates to a method for producing water absorbent resin particles, the method comprising a step wherein a polymer is crosslinked by means of a surface crosslinking agent by having the polymer and the surface crosslinking agent react with each other in a mixture of a powder of polymer particles containing the polymer and a crosslinking agent solution containing the surface crosslinking agent and water. With respect to this method for producing water absorbent resin particles: the surface crosslinking agent contains an alkylene carbonate; the amount (mass) of the surface crosslinking agent used therefor is 0.00110 or less relative to a mass of 1 of the total solid content of the polymer particles; and the content (mass) of the alkylene carbonate is 0.009 to 0.027 relative to a mass of 1 of water in the crosslinking agent solution.
Inventors:
OKAZAWA SHIHO (JP)
Application Number:
PCT/JP2022/006469
Publication Date:
September 01, 2022
Filing Date:
February 17, 2022
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08J3/24; B01J20/26; B01J20/30
Domestic Patent References:
| WO2019190120A1 | 2019-10-03 | |||
| WO2020122442A1 | 2020-06-18 |
Foreign References:
| US20200009529A1 | 2020-01-09 | |||
| JP2021504519A | 2021-02-15 | |||
| JP5250204B2 | 2013-07-31 | |||
| JP2020516753A | 2020-06-11 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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