| 摘要 |
A method of producing a water-absorbent resin of the present invention reduces amounts of a residual cross-linking agent and a residual surfactant, achieves high productivity, and improves physical properties of the resultant water-absorbent resin, such as absorption capacity, extractable polymer content, powder friction, and gel crushability. The method includes the steps of: polymerizing an aqueous monomer solution containing as a major component an acrylic acid monomer in the presence of a cross-linking agent; and drying the resultant polymer by heating, wherein the cross-linking agent comprises a multifunctional (meth)acrylate-based cross-linking agent having polyethylene glycol structural units including a total of 6 to 200 ethylene oxide repeating units, and a molecular weight distribution defined based on a distribution index of the alkylene oxide repeating units of the multifunctional (meth)acrylate-based cross-linking agent is 50 to 100%. |
