Method for the secondary cross-linking of hydrogels with 2-oxotetrahydro-1,3-oxazines
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United States of America Patent
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Dec 2, 2003
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N/A
app pub date -
May 17, 2001
filing date -
Nov 26, 1998
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Abstract
Liquid-absorbent polymers are prepared by a process for the gel and/or surface postcrosslinking of water-absorbent polymers by the polymer being treated with a surface postcrosslinking solution and being postcrosslinked and dried during and after the treatment by raising the temperature, wherein the crosslinker comprises a compound of the formula I ##STR1## where R.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -hydroxyalkyl, trialkylsilyl or acetyl and R.sup.2, R.sup.2', R.sup.3, R.sup.3', R.sup.4, R.sup.4' are each independently hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.12 -alkenyl or C.sub.6 -C.sub.12 -aryl, dissolved in an inert solvent, and are used in hygiene articles, packaging materials and nonwovens.
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