| 摘要 |
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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