Patent ID: 6576713
Filing Date: 2003-06-10
Classification: C08J,Y10T

Abstract:
A production process for a water-absorbent resin powder, which comprises the steps of:polymerizing an aqueous monomer solution containing a monomer and a crosslinking agent; heat-drying the resultant crosslinked hydrogel polymer; and pulverizing the resultant dry polymer to produce said water-absorbent resin powder; wherein: the dry polymer resultant from the heat-drying step is forcibly cooled before or during the pulverization step; and the water-absorbent resin powder has a weight-average particle diameter of 200 to 600 &mgr;m after the pulverization step wherein the total amount of particles of JIS 150-&mgr;m sieve-passed fractions and JIS 850-&mgr;m sieve-on fractions in the water-absorbent resin powder is not more than 15 weight % of the water-absorbent resin powder.