Patent ID: 7265190

Claim:
A process for production of a water-absorbent resin, which comprises the steps of mixing a monomer liquid with a polymerization initiator and then polymerizing the resultant mixture, thereby producing the water-absorbent resin; with the process further comprising the steps of: (a) continuously supplying the monomer liquid to a supply pipe line having a flow path to continuously stir a flow of the monomer liquid in the supply pipe line by continuously passing the flow of the monomer liquid through a static mixer in the flow path of the supply pipe line so that the flow of the monomer liquid is in a stirred state downstream of the static mixer while continuously passing through the supply pipe line; (b) causing the polymerization initiator to join into a flow of the monomer liquid being in a stirred state, thereby obtaining a mixed liquid of the monomer liquid and the polymerization initiator downstream of the static mixer; and (c) continuously supplying the mixed liquid from the supply pipe line to a polymerization apparatus to cause the mixed liquid to run a polymerization reaction.