Title:
METHOD FOR PRODUCING WATER-ABSORBING RESIN PARTICLES
Document Type and Number:
WIPO Patent Application WO/2021/187323
Kind Code:
A1
Abstract:
A method for producing water-absorbing resin particles is disclosed. This method comprises mixing a powder of polymer particles with a crosslinking-agent solution to form a premix and heating the premix to form particles containing the crosslinking agent introduced. If the sum of the water content in the polymer particles and the water content in the crosslinking-agent solution at the time when the powder is mixed with the crosslinking-agent solution is expressed by Y1, the water content in the premix is expressed by Y2, and the mass of the premix from which the water has been removed is expressed by Z2, then the premix is heated until the premix comes to have a water retention, as calculated with the equation Water retention (mass%) = (Y2/Y1)×100, of 85 mass% or less and a water content, as calculated with the equation Water content (mass%) = (Y2/Z2)×100, of 10 mass% or less.
Inventors:
NISHIDA MOE (JP)
Application Number:
PCT/JP2021/009867
Publication Date:
September 23, 2021
Filing Date:
March 11, 2021
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08J3/24
Domestic Patent References:
| WO2010100936A1 | 2010-09-10 | |||
| WO2016021519A1 | 2016-02-11 | |||
| WO2009123193A1 | 2009-10-08 | |||
| WO2014041968A1 | 2014-03-20 | |||
| WO2018181565A1 | 2018-10-04 |
Foreign References:
| JPH01113406A | 1989-05-02 | |||
| JP2002121291A | 2002-04-23 | |||
| JP2007119757A | 2007-05-17 | |||
| JP2005113117A | 2005-04-28 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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