Title:
METHOD FOR PRODUCING WATER ABSORBENT RESIN PARTICLES
Document Type and Number:
WIPO Patent Application WO/2024/071258
Kind Code:
A1
Abstract:
The present invention provides a method for producing water absorbent resin particles which have good general water absorption performances (such as saline absorption) required for water absorbent resins, while additionally having high gel stability and being suppressed in yellowing under high temperature and high humidity conditions. This method for producing water absorbent resin particles sequentially comprises in the following order: a step 1 in which a water-soluble ethylenically unsaturated monomer is polymerized, thereby obtaining hydrous gel particles; a step 2 in which a chelating agent, a sulfite compound and an organic antioxidant are added to the hydrous gel particles; and a step 3 in which the resulting hydrous gel particles are subjected to a surface crosslinking treatment. In the step 2, the moisture content of the hydrous gel particles when the sulfite compound is added thereto is 20% by mass to 75% by mass.
Inventors:
GOGA YUKI (JP)
AWAJI NAOYA (JP)
AWAJI NAOYA (JP)
Application Number:
PCT/JP2023/035291
Publication Date:
April 04, 2024
Filing Date:
September 27, 2023
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08F2/10; A61F13/53; C08F8/00; C08F20/00; C08K3/30; C08K5/00; C08L101/14
Domestic Patent References:
| WO2021006178A1 | 2021-01-14 | |||
| WO2011040530A1 | 2011-04-07 |
Foreign References:
| JP2005029751A | 2005-02-03 | |||
| JP2018131558A | 2018-08-23 |
Attorney, Agent or Firm:
TANAKA, Junya et al. (JP)
Download PDF: