abstract |
Provided is a method for manufacturing a water-absorbing resin that has excellent water-absorption performance and is made from an acrylic acid that is suitable for large-scale production of said water-absorbing resin. Said method for manufacturing a polyacrylic acid (salt) water-absorbing resin includes a prescribed monomer-preparation step, polymerization step, drying step, and surface-crosslinking step, in that order. The acetic-acid concentration of the acrylic acid and the like supplied to the monomer-preparation step is 300 to 10,000 ppm (with respect to the acrylic acid), and an acetic-acid-concentration decrease percentage defined by a given formula is at least 35%. |