Patent ID: 8003210

Claim:
A process for producing a water-absorbing resin particle, comprising a step of adding a post-crosslinking agent in at least two stages to a water-absorbing resin particle precursor obtained by polymerzing a water-soluble ethylenic unsaturated monomer to carry out a post-crosslinking reaction; wherein the process comprises: a first post-crosslinking reaction step of adding a post-crosslinking agent to a water-absorbing resin particle precursor having a water content of not less than 35% to carry out a post-crosslinking reaction; a water content adjustment step of reducing a water content of the post-crosslinked water-absorbing resin particle precursor to not less than 15% and less than 35%; and a second post-crosslinking reaction step of adding a post-crosslinking agent to the post-crosslinked water-absorbing resin particle precursor having a reduced water content to carry out a post-crosslinking reaction.