Title:
PROCESS FOR PRODUCING WATER-ABSORBING RESIN PARTICLES
Document Type and Number:
WIPO Patent Application WO/2017/150108
Kind Code:
A1
Abstract:
The present invention provides a process for producing water-absorbing resin particles, the process being capable of producing, with reduced stirring burden, water-absorbing resin particles having particle diameters in a specific range, the process having a high production efficiency.
The process for producing water-absorbing resin particles comprises en bloc adding an ethylenic monomer to a hydrocarbon dispersion medium containing a surfactant mixed therewith and conducting reversed-phase suspension polymerization, and is characterized in that
the reversed-phase suspension polymerization is conducted in one or more stages,
the surfactant is at least one compound selected from the group consisting of polyoxyethylene alkyl ether phosphates, alkali metal salts of polyoxyethylene alkyl ether phosphates, and alkaline-earth metal salts of polyoxyethylene alkyl ether phosphates, and
the surfactant has an HLB of 9-15.
Inventors:
HAMA MAOKI (JP)
TAKAGI KOJI (JP)
KUMAZAWA KENTA (JP)
ISOKAWA SHO (JP)
TAKAGI KOJI (JP)
KUMAZAWA KENTA (JP)
ISOKAWA SHO (JP)
Application Number:
PCT/JP2017/004528
Publication Date:
September 08, 2017
Filing Date:
February 08, 2017
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08F2/32; C08F20/06
Domestic Patent References:
| WO2011065368A1 | 2011-06-03 |
Foreign References:
| JPH0436304A | 1992-02-06 | |||
| JP2001002713A | 2001-01-09 | |||
| JP2006143766A | 2006-06-08 | |||
| JP2005238224A | 2005-09-08 | |||
| JP2005112979A | 2005-04-28 |
Other References:
See also references of EP 3424959A4
Attorney, Agent or Firm:
TANAKA, Junya et al. (JP)
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