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Title:
WATER-ABSORBENT RESIN MANUFACTURING METHOD AND LIQUID PERMEABILITY IMPROVEMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2010/032694
Kind Code:
A1
Abstract:
Disclosed is a method for manufacturing a water-absorbent resin that does not require a change in starting material or an expensive facilities investment, and that improves and stabilizes the properties of the water-absorbent resin, such as the liquid permeability, with a simple technique. The water-absorbent resin manufacturing method includes a polymerization step wherein an acrylic acid (salt) aqueous solution is polymerized to obtain an aqueous gel-type cross-linked polymer, a drying step wherein the aqueous gel-type cross-linked polymer is dried to obtain a water-absorbent resin powder, a classification step wherein the water-absorbent resin powder is classified and a surface cross-linking step wherein the water-absorbent resin powder is surface-cross-linked before or after the classification step, and is characterized in that electrical neutralization is performed in the classification step.

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Inventors:
DAIROKU YORIMICHI (JP)
NOGI KOZO (JP)
KANZAKI SYUJI (JP)
ISHIZAKI KUNIHIKO (JP)
MATSUMOTO KOJI (JP)
MITSUKAMI YOSHIRO (JP)
Application Number:
PCT/JP2009/065948
Publication Date:
March 25, 2010
Filing Date:
September 11, 2009
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
DAIROKU YORIMICHI (JP)
NOGI KOZO (JP)
KANZAKI SYUJI (JP)
ISHIZAKI KUNIHIKO (JP)
MATSUMOTO KOJI (JP)
MITSUKAMI YOSHIRO (JP)
International Classes:
C08F6/00; C08F8/00; C08F20/06
Domestic Patent References:
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Other References:
See also references of EP 2338918A4
Attorney, Agent or Firm:
HATTA & ASSOCIATES (JP)
Hatta international patent business corporation (JP)
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