C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 8/30 (2006.01) A61L 15/00 (2006.01)
Patent
CA 2347897
The invention relates to a method for the secondary cross-linking of gels or surfaces of water-absorbing polymers by treating the polymer with a surface secondary cross-linking agent and subsequently subjecting it to a secondary cross-linking reaction during or after the treatment by raising the temperature and drying the polymer. According to the invention, the cross- linking agent is a compound of formula (I), wherein R1 is hydrogen, C1-C4 alkyl, C1-C4 hydroxyalkyl, trialkylsilyl or acetyl and R2, R2', R3, R3', R4, R4' independently is hydrogen, C1-C12 alkyl, C2-C12 alkenyl or C6-C12 aryl, dissolved in an inert solvent. The invention also relates to the liquid- absorbing polymers obtained by said method, to their use in hygiene items, packaging material and nonwovens.
L'invention concerne un procédé de post-réticulation de gels et/ou de surfaces de polymères absorbant l'eau. Selon ce procédé, le polymère est traité avec une solution de post-réticulation superficielle et est post-réticulé pendant ou après le traitement par élévation de la température et est séché. L'agent de réticulation est un composé de la formule (I) dans laquelle R?1¿ désigne hydrogène, alkyle C¿1?-C¿4?, hydroxyalkyle C¿1?-C¿4?, trialkylsilyle ou acétyle et R?2¿, R?2'¿, R?3¿, R?3'¿, R?4¿, R?4'¿ désignent indépendamment les uns des autres, hydrogène, alkyle C¿1?-C¿12?, alkényle C¿2?-C¿12? ou aryle C¿6?-C¿12?, dissous dans un solvant inerte. L'invention concerne en outre des polymères absorbant des liquides, qui sont obtenus selon ledit procédé, ainsi que leur utilisation dans des articles d'hygiène, des matériaux d'emballage et des non-tissés.
Daniel Thomas
Engelhardt Fritz
Frenz Volker
Riegel Ulrich
Weismantel Matthias
Basf Aktiengesellschaft
Borden Ladner Gervais Llp
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