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Title:
METHOD FOR PRODUCING PARTICULATE WATER-ABSORBING AGENT THAT HAS POLYACRYLIC ACID (SALT)-BASED WATER-ABSORBING RESIN AS MAIN COMPONENT
Document Type and Number:
WIPO Patent Application WO/2016/159144
Kind Code:
A1
Abstract:
Provided is a method for producing a particulate water-absorbing agent, the method including a polymerization step for obtaining a water-containing gel-type crosslinked polymer by polymerizing an acrylic acid (salt)-based monomer aqueous solution, a drying step for obtaining a dry polymer by drying the water-containing gel-type crosslinked polymer, a sorting step for obtaining a water-absorbing resin powder of a specific particle size by sorting the polymer to be sorted, and a surface crosslinking step for surface-crosslinking the non-surface-crosslinked water-absorbing resin powder, wherein the sorting step is performed before and/or after the surface crosslinking step, and the shape of the holes of the sorting sieve used in the sorting step is a non-regular polygonal or non-circular shape.

Inventors:
TORII, Kazushi (992-1, Aza-Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
ISHIZAKI, Kunihiko (992-1, Aza-Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
FUJINO, Shinichi (992-1, Aza-Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
WAKABAYASHI, Ryota (992-1, Aza-Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
IMURA, Motohiro (992-1, Aza-Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
Application Number:
JP2016/060497
Publication Date:
October 06, 2016
Filing Date:
March 30, 2016
Export Citation:
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Assignee:
NIPPON SHOKUBAI CO., LTD. (1-1 Koraibashi 4-chome, Chuo-ku Osaka-sh, Osaka 43, 〒5410043, JP)
International Classes:
C08J3/12; B01J20/26; B01J20/30; B07B1/28; B07B1/46; C08F2/32; C08F20/06
Domestic Patent References:
2011-08-18
2016-04-07
Foreign References:
JPH06107800A1994-04-19
JPH10202187A1998-08-04
JP2008526498A2008-07-24
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (Daiwa Minamimorimachi Building, 2-6 Tenjinbashi 2-chome Kita, Kita-ku, Osaka-sh, Osaka 41, 〒5300041, JP)
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