WATER-ABSORBENT RESIN PARTICLE, METHOD FOR PRODUCTION THEREOF, AND ABSORBENT MATERIAL USING THE SAME
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United States of America Patent
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Issued Date -
Jul 23, 2009
app pub date -
Jul 27, 2007
filing date -
Aug 4, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a water-absorbent resin particle which is excellent in a particle strength, and in which even after mechanical impact, a particle diameter retaining rate and a retaining rate of water absorption capacity under pressure are high, a method for production thereof, and an absorbent material using the same. More particularly, the present invention provides a water-absorbent resin particle obtained by polymerizing a water-soluble ethylenic unsaturated monomer using a water-soluble radical polymerization initiator, if necessary, in the presence of a crosslinking agent, to obtain a water-absorbent resin particle precursor, adding a post-crosslinking agent to crosslink a surface of the particle, and adding an amorphous silica particle, in which a moisture content is 10 to 20%, and a particle diameter retaining rate after a particle collision test is 90% or more, a method for production thereof, and an absorbent material using the same.
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