Title:
METHOD FOR PRODUCING WATER-ABSORBING RESIN
Document Type and Number:
WIPO Patent Application WO/2006/008905
Kind Code:
A1
Abstract:
Disclosed is a method for easily producing a water-absorbing resin with less coloring wherein only a small amount of a polymerization inhibitor remains. Also disclosed is such a water-absorbing resin. Specifically disclosed is a method for producing a water-absorbing resin which is characterized in that a water-soluble ethylenically unsaturated monomer is polymerized and then a hydrous gel of the thus-obtained polymer is dried in an atmosphere containing no oxygen or having an oxygen concentration of not more than 5 volume% at a pressure of 5-90 kPa. By such a production method, there can be obtained a water-absorbing resin having a degree of yellowing of not more than 20 wherein the amount of the remaining polymerization inhibitor is not more than 30 ppm.
Inventors:
MATSUDA KENYA (JP)
KAKIMOTO HIDENOBU (JP)
NAWATA YASUHIRO (JP)
KAKIMOTO HIDENOBU (JP)
NAWATA YASUHIRO (JP)
Application Number:
PCT/JP2005/011440
Publication Date:
January 26, 2006
Filing Date:
June 22, 2005
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
MATSUDA KENYA (JP)
KAKIMOTO HIDENOBU (JP)
NAWATA YASUHIRO (JP)
MATSUDA KENYA (JP)
KAKIMOTO HIDENOBU (JP)
NAWATA YASUHIRO (JP)
International Classes:
C08F6/00; (IPC1-7): C08F6/00
Foreign References:
| JP2000026510A | 2000-01-25 | |||
| JPH07278224A | 1995-10-24 | |||
| JPH11322846A | 1999-11-26 | |||
| JP2003246810A | 2003-09-05 | |||
| JP2003206305A | 2003-07-22 |
Other References:
See also references of EP 1790668A4
Attorney, Agent or Firm:
Kawamiya, Osamu (IMP Building 3-7, Shiromi 1-chome, Chuo-k, Osaka-shi Osaka, JP)
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