Patent ID: 7622535

Claim:
A method for continuous production of a water-absorbent resin by use of a continuous polymerization device comprising a charge part of a monomer aqueous solution containing a monomer, a polymerization initiator and a crosslinking agent; an endless belt on which the monomer and a hydropolymer formed are conveyed; and a discharge part of the hydropolymer, wherein the monomer aqueous solution is fed to the endless belt at a temperature between 50° C. and 105° C.; the monomer is polymerized on the endless belt; and the continuous polymerization device has side walls and a ceiling, the space ratio in the device represented by the following equation 1 being in the range of 1.2 to 20: Space ratio in the device= B/A [Equation 1] wherein A is a maximum cross-sectional area (cm 2 ) of the hydropolymer during the polymerization in the width direction of the endless belt, and B is a maximum cross-sectional area (cm 2 ) of the space between the endless belt of the continuous polymerization device and the ceiling of the continuous polymerization device in the width direction of the endless belt.