Title:
METHOD FOR PRODUCING PARTICULATE WATER ABSORBENT
Document Type and Number:
WIPO Patent Application WO/2020/189539
Kind Code:
A1
Abstract:
The present invention provides a method for stably producing a particulate water absorbent which has high water absorption rate, while containing a polyacrylic acid (salt). A method for producing a particulate water absorbent according to the present invention comprises a polymerization step, a gel coarse grinding step (D50 is from 500 μm to 10 cm), a gel grinding step (D50' is from 360 μm to 1,500 μm; PDCR is from 0.02 to 0.10), a drying step and a surface crosslinking step. With respect to this method for producing a particulate water absorbent, the ratio of the nonvolatile component of a hydrous gel to the total weight of the hydrous gel is from 10% by weight to 48% by weight; and the CRC of the particulate water absorbent is 32.0 g/g or more.
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Inventors:
TAMAKI MARIKO (JP)
TORII KAZUSHI (JP)
TORII KAZUSHI (JP)
Application Number:
PCT/JP2020/011004
Publication Date:
September 24, 2020
Filing Date:
March 13, 2020
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08J3/12; C08F6/00; C08F20/06; A61F13/15; A61F13/53
Domestic Patent References:
| WO2016204302A1 | 2016-12-22 | |||
| WO2011040530A1 | 2011-04-07 | |||
| WO2017170605A1 | 2017-10-05 | |||
| WO2018155591A1 | 2018-08-30 | |||
| WO2015030130A1 | 2015-03-05 | |||
| WO2018139768A1 | 2018-08-02 | |||
| WO2011126079A1 | 2011-10-13 |
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (JP)
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