Method for the secondary cross-linking of hydrogels with N-acyl-2-oxazolidinones
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United States of America Patent
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May 6, 2003
Grant Date -
N/A
app pub date -
May 29, 2001
filing date -
Nov 26, 1998
priority date (Note) -
Expired
status (Latency Note)
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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 surface postcrosslinking solution comprises as crosslinker a compound of the formula I ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkenyl, C.sub.6 -C.sub.12 -aryl or C.sub.1 -C.sub.12 -alkoxy, R.sup.5 is C.sub.1 -C.sub.16 -alkyl, C.sub.1 -C.sub.4 -hydroxyalkyl, C.sub.6 -C.sub.12 -aryl, C.sub.1 -C.sub.16 -alkenyl or a group of the formula --(CH.sub.2).sub.n --COOH or --(CH.sub.2).sub.n --SO.sub.3 H in the form of the acid or a respective metal salt, ammonium salt or triethanolammonium salt thereof or --(CH.sub.2 --CH.sub.2 --O--).sub.m --R.sup.6, R.sup.6 is hydrogen or C.sub.1 -C.sub.16 -alkyl, n is from 1 to 10, m is from 1 to 20 dissolved in an inert solvent, and are used in hygiene articles, packaging materials and nonwovens.
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