Process for producing water-absorbing resin
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United States of America Patent
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Jun 15, 2010
Grant Date -
Apr 21, 2005
app pub date -
Dec 27, 2002
filing date -
Jan 16, 2002
priority date (Note) -
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Abstract
A process for preparing a water-absorbent resin made from an α,β-unsaturated carboxylic acid as an essential monomer characterized in that the process comprises allowing a metal chelating agent to be present at any step in the process in an amount of 0.001 to 6 parts by weight, based on 100 parts by weight of the α,β-unsaturated carboxylic acid; and adding a reducing agent or an oxidizing agent thereto in an amount of 0.001 to 6 parts by weight, based on 100 parts by weight of the α,β-unsaturated carboxylic acid before initiation of drying and/or during drying of a gelated product containing a water-absorbent resin obtained by polymerization.
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