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Title:
PROCESS FOR PRODUCING POLYACRYLIC ACID (SALT)-BASED WATER-ABSORBING RESIN
Document Type and Number:
WIPO Patent Application WO/2014/021432
Kind Code:
A1
Abstract:
Provided is a process whereby a polyacrylic acid (salt)-based water-absorbing resin having improved or intact material properties (in particular, liquid permeability) can be produced even on a large scale. The process for producing a polyacrylic acid (salt)-based water-absorbing resin comprises in the following order: a polymerization step in which an aqueous monomer solution containing acrylic acid (salt) as the main component is polymerized; a drying step in which the crosslinked polymer in a hydrous gel form obtained in the polymerization step is dried; and a classification step in which the polymer obtained in the drying step is classified. In the classification step, use is made of a shaking sifter in which the trajectory and the number of revolutions of the screen of the shaking sifter are within the following ranges. Radial inclination R: 5-40 mm Tangential inclination T: 0.1-25 mm Eccentric inclination E: 40-80 mm Number of revolutions F: 60-600 rpm

Inventors:
MATSUMOTO, Makoto (992-1, Aza Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
KATO, Seiji (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)
NABARA, Noboru (992-1, Aza Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
OTANI, Ryuichi (992-1, Aza Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
KAWAGUCHI, Yasuhiro (992-1, Aza Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
OKUGAWA, Narimasa (992-1, Aza Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
ICHIKAWA, Kentaro (992-1, Aza Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
ETO, Makoto (992-1, Aza Nishioki, Okinohama, Aboshi-ku, Himeji-sh, Hyogo 82, 〒6711282, JP)
Application Number:
JP2013/070916
Publication Date:
February 06, 2014
Filing Date:
August 01, 2013
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; B07B1/00; B07B1/28; B07B1/46; B07B1/50; C08F220/06
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See also references of EP 2881420A4
Attorney, Agent or Firm:
HATTA & ASSOCIATES (Dia Palace Nibancho, 11-9 Nibancho, Chiyoda-k, Tokyo 84, 〒1020084, JP)
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