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Title:
METHOD FOR PRODUCING WATER ABSORBENT
Document Type and Number:
WIPO Patent Application WO/2017/221911
Kind Code:
A1
Abstract:
Provided is a method for efficiently producing a water absorbent having superior physical properties. This method for producing a water absorbent includes a drying step for drying a particulate water-containing gel crosslinked polymer containing a drying aid. The drying aid is (a) a compound having, in the molecule, a long-chain alkyl group having eight or more carbon atoms, a single quaternary nitrogen atom, and a single acid radical, and having a betaine structure, and/or (b) a compound having, in the molecule, a long-chain alkyl group having eight or more carbon atoms, a single tertiary nitrogen atom, and one or more acid radicals. The amount of the drying aid added is 0.001-0.5 mass% with respect to the gel solids of the particulate water-containing gel crosslinked polymer. In the production method, water absorbent resin powder obtained through the drying step is subjected to surface crosslinking.

Inventors:
WAKABAYASHI RYOTA (JP)
SATO MAI (JP)
IMURA MOTOHIRO (JP)
SHUTO TOKIO (JP)
SHOBO YOSHIHIRO (JP)
Application Number:
PCT/JP2017/022605
Publication Date:
December 28, 2017
Filing Date:
June 20, 2017
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08J3/12; B01J20/26; B01J20/30; C08J3/24
Domestic Patent References:
WO2000022017A12000-04-20
WO2011126079A12011-10-13
Foreign References:
JPH10114801A1998-05-06
JP2007071415A2007-03-22
JP2016030832A2016-03-07
JP2001213914A2001-08-07
JPH08134134A1996-05-28
JPH11158341A1999-06-15
JPH11188726A1999-07-13
JP2009148163A2009-07-09
JPH08134134A1996-05-28
JP2016030832A2016-03-07
JP2006160774A2006-06-22
JP2007071415A2007-03-22
JP2001213914A2001-08-07
US7638570B22009-12-29
US7265190B22007-09-04
US4893999A1990-01-16
US6987151B22006-01-17
US4093776A1978-06-06
US7183456B22007-02-27
Other References:
See also references of EP 3473664A4
Attorney, Agent or Firm:
OKA Kengo (JP)
Download PDF:
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