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Process for crosslinking hydrogels with bis- and poly-2- oxazolidinones

  • US 6,472,478 B1
  • Filed: 08/18/2000
  • Issued: 10/29/2002
  • Est. Priority Date: 02/21/1998
  • Status: Expired due to Term
First Claim
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1. A process for the gel or surface postcrosslinking of water-absorbing polymers, comprising;

  • treating polymers with a surface postcrosslinking solution containing a crosslinker, and postcrosslinking and drying by means of an increase in temperature, wherein said crosslinker is a compound of the formula embedded imagein which R1 and R2 independently of one another are H, hydroxyl, phenyl or C1-C6-alkyl, R3 is hydrogen, C1-C12-alkyl, N-hydroxy-(C2-C6)-alkyl, C1-C12-alkenyl or C6-C12-aryl and R4 a R5 independently of one another are C1-C12-alkoxy or hydrogen, dissolved in an inert solvent.

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