Title:
METHOD FOR PRODUCING WATER-ABSORBING RESIN PARTICLE
Document Type and Number:
WIPO Patent Application WO/2021/246244
Kind Code:
A1
Abstract:
Disclosed is a method for producing a water-absorbing resin particle, the method including coarsely pulverizing a water-containing gelatinous polymer formed from a mixture containing a monomer and water so as to form a coarsely pulverized product, and then coarsely pulverizing the coarsely pulverized product so as to form a coarsely pulverized product containing a plurality of structures having shapes that can pass through circular holes having diameters of 7 mm. The elapsed time t between the time at which the temperature of the mixture reaches a maximum value Tmax and the time at which coarse pulverization starts is 15 minutes or less, and the elapsed time is a period of time selected so that the amount of polymer particles obtained from the coarsely pulverized product that dissolve in a physiological saline solution at 25°C is less than said amount in a case where t is 30 minutes and T is X. X is a temperature within the range 70±3ºC. The temperature T of the water-containing gelatinous polymer at the point of time at which coarse pulverization starts falls within the range X±25ºC.
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Inventors:
OKAZAWA SHIHO (JP)
Application Number:
PCT/JP2021/019823
Publication Date:
December 09, 2021
Filing Date:
May 25, 2021
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08J3/12; C08F220/06
Domestic Patent References:
| WO2019221235A1 | 2019-11-21 | |||
| WO2012043821A1 | 2012-04-05 |
Foreign References:
| JP2002121291A | 2002-04-23 | |||
| JP2010202743A | 2010-09-16 | |||
| JP2018119142A | 2018-08-02 | |||
| JP2004067878A | 2004-03-04 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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