Patent ID: 8809475
Filing Date: 2014-08-19
Classification: C08J

Abstract:
1. A production method for a water-absorbent resin, comprising a polymerization step for obtaining hydrogel by subjecting an aqueous monomer solution to a polymerization reaction, and a drying step for drying the hydrogel, wherein drying in the drying step is performed using a continuous through-flow belt-type drying machine, the solid content of the hydrogel supplied to the drying step is 35% by weight or more, the hydrogel is loaded on the through-flow belt of the continuous through-flow belt-type drying machine by using a traverse feeder or an oscillating feeder operated at a non-constant peripheral speed, and thickness variation rate (1) represented by the following EXPRESSION 1 of the hydrogel loaded onto through-flow belt in the continuous through-flow belt, is 1.10 to 5: