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Title:
PARTICULATE WATER ABSORBENT AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2021/095806
Kind Code:
A1
Abstract:
[Problem] To improve the residual ratio of a chelating agent in a particulate water absorbent, which is the final product, in a mode wherein the chelating agent is added in an upstream step such as a polymerization step in the production process. [Solution] A particulate water absorbent which is mainly composed of a poly(meth)acrylic acid (salt)-based water absorbent resin, while containing a chelating agent having a nitrogen atom and an inorganic reducing agent having a sulfur atom, wherein the chelating agent ratio as calculated by the steps (a) to (c) described below is from 0.8 to 1.8. (a) A predetermined impact test is performed on the particulate water absorbent. (b) The particulate water absorbent, on which the impact test has been performed, is sieved into particle group 1 having a particle diameter of less than 300 μm and a particle group 2 having a particle diameter of 300 μm or more but less than 850 μm by means of JIS standard sieves. (c) After determining the quantity of a chelating agent content C1 that is present in particle group 1 and the quantity of a chelating agent content C2 that is present in particle group 2, C1 is divided by C2.

Inventors:
MATSUMOTO SATOSHI (JP)
TSURU KANAKO (JP)
KOBAYASHI TAISHI (JP)
TAKAGI DAISUKE (JP)
TORII KAZUSHI (JP)
Application Number:
PCT/JP2020/042263
Publication Date:
May 20, 2021
Filing Date:
November 12, 2020
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
B01J20/26; B01J20/30; C08F20/06; C08K5/09; C08L33/02
Domestic Patent References:
WO2015053372A12015-04-16
WO2017170604A12017-10-05
WO2015129917A12015-09-03
WO2011040530A12011-04-07
WO2011040530A12011-04-07
WO2015053372A12015-04-16
WO2009005114A12009-01-08
WO2011126079A12011-10-13
WO2006100300A12006-09-28
WO2011025012A12011-03-03
WO2011111657A12011-09-15
Foreign References:
JP2016112475A2016-06-23
JP2003206305A2003-07-22
JP2005029751A2005-02-03
US6241928B12001-06-05
US20050215734A12005-09-29
US7153910B22006-12-26
US8598254B22013-12-03
US7638570B22009-12-29
US7183456B22007-02-27
JPH09235378A1997-09-09
JP2019204870A2019-11-28
Other References:
"McGraw-Hill Dictionary of Scientific and Technical Terms", 1996, NIKKAN KOGYO SHIMBUN, LTD., article "Particle", pages: 1929
See also references of EP 4059602A4
Attorney, Agent or Firm:
HATTA & ASSOCIATES (JP)
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