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Title:
METHOD FOR PRODUCING WATER-ABSORBING RESIN POWDER
Document Type and Number:
WIPO Patent Application WO/2022/065365
Kind Code:
A1
Abstract:
[Problem] To provide a method for producing a water-absorbing resin powder having an excellent water absorption rate. [Solution] The method for producing a water-absorbing resin powder, according to the present invention, comprises: a polymerization step for polymerizing a monomer aqueous solution to obtain a hydrogel-like crosslinked polymer; a gel pulverization step, after the polymerization step, for pulverizing the hydrogel-like crosslinked polymer using a gel pulverizer to obtain a particulate hydrogel-like crosslinked polymer; and a drying step for drying the particulate hydrogel-like crosslinked polymer to obtain a dried product. The gel pulverizer includes an input port, a discharge port, and a main body having a plurality of rotating shafts. Each of the rotating shafts has a pulverization means, and in the gel pulverization step, the hydrogel-like crosslinked polymer is continuously input from the input port, the hydrogel-like crosslinked polymer is continuously pulverized at 50°C or more by the pulverization means, a particulate hydrogel-like crosslinked polymer is continuously taken out from the discharge port, the polymerization rate of the hydrogel-like crosslinked polymer input into the input port is 90% by mass or more, and the mass average particle diameter d1 in terms of solid content of the particulate hydrogel-like crosslinked polymer discharged from the discharge port is 3 mm or less.

Inventors:
YORINO TSUYOSHI (JP)
ARAKE TOMOYUKI (JP)
HAYASHI HIROKI (JP)
WAKABAYASHI RYOTA (JP)
INOUE MASAHUMI (JP)
KATAKURA NAOKI (JP)
ADACHI YOSHIFUMI (JP)
MITSUKAMI YOSHIRO (JP)
YAMAGUCHI TATSUYA (JP)
Application Number:
PCT/JP2021/034800
Publication Date:
March 31, 2022
Filing Date:
September 22, 2021
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08F20/00; C08F6/06; C08F20/06; C08J3/12
Domestic Patent References:
WO2011126079A12011-10-13
WO2013002387A12013-01-03
WO2001038402A12001-05-31
WO2011126079A12011-10-13
WO2015129917A12015-09-03
WO2016204302A12016-12-22
Foreign References:
JP2004002562A2004-01-08
JPH11188727A1999-07-13
JP2014524956A2014-09-25
JPS5734101A1982-02-24
JPS6055002A1985-03-29
JPH05112654A1993-05-07
US7638570B22009-12-29
US7265190B22007-09-04
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US6241928B12001-06-05
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US6987151B22006-01-17
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JP2005035212A2005-02-10
US20130026412A12013-01-31
US20160332141A12016-11-17
JP2020161054A2020-10-01
Attorney, Agent or Firm:
HATTA & ASSOCIATES (JP)
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