Patent ID: 8765906

Claim:
A method for producing a water absorbent resin powder, comprising in sequence: a polymerization step of an aqueous solution of a monomer, the solution including acrylic acid and/or a salt thereof as a main component; a gel-crushing step of a water-containing gel-like crosslinked polymer during or after polymerization; a drying step of the water-containing gel-like crosslinked polymer; and a pulverization and classification step of the dried polymer, wherein, water absorbent resin fine particles having a particle size of less than 150 μm or hydrated-particles thereof are added to a step prior to the drying step, and hot air drying is carried out in the drying step with hot air having an average flow velocity of 1.0 to 3.0 [m/s], a dew point of 30 to 100° C., and a temperature of 140 to 235° C.