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Title:
METHOD FOR PRODUCING WATER-ABSORBING RESIN
Document Type and Number:
WIPO Patent Application WO/2019/221235
Kind Code:
A1
Abstract:
The present invention addresses the problem of reducing the undried residue when recycling a fine powder of water-absorbing resin. The present invention is a method for producing a water-absorbing resin, wherein: a fine powder recycling step includes vi-1) a granulation step for obtaining a granulated gel, vi-2) a granulated gel addition step, and vi-3) a gel mixing step; the solids content of the granulated gel in the granulated gel addition step is 50-90% by mass; and the temperature of the granulated gel and the temperature of the water-containing gel-like crosslinked polymer is 50-100°C.

Inventors:
MATSUMOTO SATOSHI (JP)
KADONAGA KENJI (JP)
ISHIZAKI KUNIHIKO (JP)
Application Number:
PCT/JP2019/019517
Publication Date:
November 21, 2019
Filing Date:
May 16, 2019
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08J3/02; C08F8/00; C08F20/06; C08J3/20
Domestic Patent References:
WO2011136301A12011-11-03
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Other References:
"Testing method for water absorption rate of water-absorbent resins", JIS K, vol. 7224, 1996
See also references of EP 3795613A4
Attorney, Agent or Firm:
USFI PATENT ATTORNEYS INTERNATIONAL OFFICE (JP)
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