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POLYACRYLIC ACID (SALT), POLYACRYLIC ACID (SALT)-BASED WATER-ABSORBING RESIN, AND PROCESS FOR PRODUCING SAME

  • US 20170158791A1
  • Filed: 02/23/2017
  • Published: 06/08/2017
  • Est. Priority Date: 04/26/2010
  • Status: Active Grant
First Claim
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1. A method for producing a polyacrylic acid (salt)-type water-absorbing resin selected from a water-soluble polyacrylic acid (salt) or a polyacrylic acid (salt)-type water-absorbing resin comprising a polymerization step for a water-soluble unsaturated monomer and a drying step for the obtained water containing gel-like crosslinked polymer, whereinthe polymerization step is for polymerizing acrylic acid with a carbon stable isotope ratio (δ

  • 13C) 20‰

    or higher as the water-soluble unsaturated monomer.

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