Hydrogels capable of absorbing aqueous fluids

Details Hydrogels capable of absorbing aqueous fluids Hydrogels capable of absorbing aqueous fluids

C - Chemistry, Metallurgy

08

L

C08L 33/02 (2006.01) A61L 15/18 (2006.01) A61L 15/60 (2006.01) C08F 2/44 (2006.01) C08F 20/04 (2006.01) C08J 3/20 (2006.01) C08K 3/34 (2006.01)

Patent

CA 2352579

The invention relates to hydrogels capable of absorbing aqueous fluids, which hydrogels are produced by polymerization of olefinically unsaturated carboxylic acids or their derivatives. The hydrogels are characterized in that before, during or after the polymerization reaction and before drying a silicic acid alkali salt of the general formula (I) M2O x n SiO2 is added to the polymerization reaction mixture. In said formula M is an alkali metal and n is a number between 0.5 and 4. The hydrogel obtained in this way is then dried at an elevated temperature. The invention also relates to a method for producing said hydrogels and to their use for absorbing aqueous fluids.

L'invention concerne des hydrogels absorbant des liquides aqueux, produits par polymérisation d'acides carboxyliques oléfiniquement insaturés ou de leurs dérivés, qui se caractérisent par le fait que l'on ajoute au mélange de réaction de polymérisation, avant, pendant ou après la réaction de polymérisation et avant le séchage, un sel alcalin d'acide silicique correspondant à la formule générale (I) M¿2?O x n SiO¿2?, où M représente un métal alcalin et n représente un nombre pouvant aller de 0,5 à 4, et en ce que l'hydrogel ainsi obtenu est ensuite séché à température élevée. L'invention concerne également un procédé de production de ces hydrogels, ainsi que leur utilisation pour l'absorption de liquides aqueux.

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