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Title:
PROCESS FOR PRODUCING WATER-ABSORBING RESIN POWDER
Document Type and Number:
WIPO Patent Application WO/2011/099586
Kind Code:
A1
Abstract:
Provided is a process for producing a water-absorbing resin powder which contains a given amount of water added thereto, has a low dust content, and has high material properties. When a water-absorbing resin powder which has undergone surface crosslinking is produced on an industrial scale, various problems concerning production are eliminated and a long-term stable operation is possible without causing a deterioration in the material properties of the resin. Even when the process is continued over a long period, the material properties are stabilized (decrease in standard deviation) or improved (improvement in AAP). The process for producing a water-absorbing resin comprises, in the following order, a first classification step for classifying a water-absorbing resin, a surface crosslinking step after the classification, a water addition step for adding water to the water-absorbing resin powder after or during the surface crosslinking, a second classification step, and a conveying step.

Inventors:
OKUDA SUMIO (JP)
ISHIZAKI KUNIHIKO (JP)
WADA KATSUYUKI (JP)
Application Number:
PCT/JP2011/052945
Publication Date:
August 18, 2011
Filing Date:
February 10, 2011
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
OKUDA SUMIO (JP)
ISHIZAKI KUNIHIKO (JP)
WADA KATSUYUKI (JP)
International Classes:
C08J3/12; B01J20/26
Domestic Patent References:
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Other References:
See also references of EP 2535369A4
Attorney, Agent or Firm:
UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)
Download PDF:
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Claims:



 
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