| http://www.w3.org/ns/prov#value | - The method for adding the crosslinking agent is not especially limited, and may be carried out such that the crosslinking agent is added to a water-absorbent resin as dispersed in an inert solvent, but in a preferable method, a crosslinking agent reactable upon carboxyl group is dissolved or dispersed into the hydrophilic solvent, and the resultant solution or dispersion is then sprayed or dropped
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