Water-absorbent resin and production process therefor
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United States of America Patent
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Feb 27, 2007
Grant Date -
Sep 23, 2004
app pub date -
Jan 27, 2004
filing date -
Sep 20, 2000
priority date (Note) -
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Abstract
In a production process for a water-absorbent resin, comprising the steps of: blending a liquid material and a water-absorbent resin; and heating the resultant mixture in order to produce a modified water-absorbent resin, the present invention is to provide: a method for uniformly and efficiently treating a water-absorbent resin favorably in view of industry, and as a result, a good-balanced water-absorbent resin having various excellent properties, such absorption capacity without a load, absorption capacity under a load, and single-layer absorption capacity under a load in contact with an aqueous liquid. The production process comprises the step of spray-blending a water-absorbent resin (A) and a liquid material (B) with a blending apparatus equipped with a spray nozzle (C), wherein the liquid material (B) is sprayed from the spray nozzle (C) and its spray pattern is a circular and hollow cone shape or a double-convex-lens and elliptic cone shape. In addition, the production process comprises the step of heat-treating a water-absorbent resin under an atmosphere having a dew point of not higher than 60.degree. C. and a temperature of not lower than 90.degree. C., wherein the water-absorbent resin is obtained after a drying step following a pulverization step.
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