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Title:
POLYACRYLIC ACID (SALT) WATER ABSORBENT RESIN AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2011/024975
Kind Code:
A1
Abstract:
Disclosed is a method for producing a water absorbent resin, by which a surface-crosslinked water absorbent resin having excellent physical properties can be efficiently obtained at low cost, while assuring high productivity. When the production scale is increased to a continuous production at 1 t/hr or more, the physical properties are improved and stabilized (for example, standard deviation of the physical properties is reduced) by a surface-crosslinking treatment, and the absorption against pressure (AAP) and liquid permeability (SFC) are further improved. Specifically disclosed is a method for producing a water absorbent resin, which is characterized in that the stirring shaft of the continuous blender for the surface-crosslinking agent is heated during the mixing step of the surface-crosslinking agent or that the continuous blender for the surface-crosslinking agent is operated at a pressure that is reduced relative to the ambient pressure and a gas flow is passed through the blender during the mixing of the surface-crosslinking agent so that the gas flow in the blender is 40˚C or more (when defined with respect to the gas temperature at the exit).

Inventors:
KITANO TAKAHIRO (JP)
NOGI KOZO (JP)
ISHIZAKI KUNIHIKO (JP)
Application Number:
PCT/JP2010/064646
Publication Date:
March 03, 2011
Filing Date:
August 27, 2010
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
KITANO TAKAHIRO (JP)
NOGI KOZO (JP)
ISHIZAKI KUNIHIKO (JP)
International Classes:
C08J3/24; C08J3/12
Domestic Patent References:
WO2009113673A12009-09-17
WO2007065840A12007-06-14
WO2009028568A12009-03-05
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Other References:
See also references of EP 2471846A4
Attorney, Agent or Firm:
UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)
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