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Title:
吸水剤の製造方法
Document Type and Number:
Japanese Patent JP6727301
Kind Code:
B2
Abstract:
[Object] To provide a method for efficiently producing a water-absorbing agent having excellent physical properties. [Solution] The method for producing a water-absorbing agent includes a drying step of drying a particulate crosslinked hydrogel polymer containing a drying aid. The drying aid is (a) a compound having a betaine structure and having a long-chain alkyl group having 8 or more carbon atoms, one quaternary nitrogen, and one acid group within a molecule thereof and/or (b) a compound having a long-chain alkyl group having 8 or more carbon atoms, one tertiary nitrogen, and one or more acid groups within a molecule thereof. An addition amount of the drying aid with respect to a gel solid content of the particulate crosslinked hydrogel polymer is 0.001% by mass to 0.5% by mass. In this production method, surface-crosslinking is performed on water-absorbent resin powder obtained through the drying step.

Inventors:
Ryota Wakabayashi
Mai Sato
Imura Motohiro
Tokio Suto
Masaho Yoshihiro
Application Number:
JP2018524101A
Publication Date:
July 22, 2020
Filing Date:
June 20, 2017
Export Citation:
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Assignee:
Nippon Shokubai Co., Ltd.
International Classes:
C08J3/12
Domestic Patent References:
JP10114801A
JP2007071415A
JP2016030832A
JP2001213914A
JP8134134A
JP11158341A
JP11188726A
JP2009148163A
Attorney, Agent or Firm:
Patent business corporation Yuko patent office