Patent ID: 9580519
Date: 2017-02-28
CPC Classifications: C08F,C08J

Claim:
1. A method for producing a polyacrylic acid (salt)-based water absorbent resin, the production process comprising: a polymerization step of polymerizing an aqueous monomer solution containing a polymerization inhibitor, acrylic acid (salt) and an internal cross-linking agent to produce a water-containing gel-like cross-linked polymer; a gel-crushing step of performing the gel-crushing of the water-containing gel-like cross-linked polymer simultaneously with or subsequent to the polymerization to produce a particulate water-containing gel-like cross-linked polymer; a gel transporting step of supplying the particulate water-containing gel-like cross-linked polymer to a continuous through-flow belt-type dryer by a traverse conveyor; and a drying step of drying the particulate water-containing gel-like cross-linked polymer by the continuous through-flow belt-type dryer, wherein the belt temperature of the traverse conveyor is 40 to 120 C.