Water-absorbent resin powder and production process therefor

  • US 6,576,713 B2
  • Filed: 02/22/2001
  • Issued: 06/10/2003
  • Est. Priority Date: 02/29/2000
  • Status: Active Grant
First Claim
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1. 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 μ

    m after the pulverization step wherein the total amount of particles of JIS 150-μ

    m sieve-passed fractions and JIS 850-μ

    m sieve-on fractions in the water-absorbent resin powder is not more than 15 weight % of the water-absorbent resin powder.

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