Collapsed superabsorbent foams

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/28 (2006.01) A61L 15/22 (2006.01) A61L 15/42 (2006.01) A61L 15/60 (2006.01) C08L 101/14 (2006.01)

Patent

CA 2250138

A porous material for absorption of aqueous body fluids comprising superabsorbent polymer, which can swell upon absorption of aqueous liquids, and which forms a porous structure having a surface-to-mass ratio of at least 0.2 m2/g, characterized in that the pores of said porous structure are collapsed to less than a third of their expanded volume prior upon wetting with said aqueous body liquids; and in that the pores expand upon wetting with aqueous liquids. The collapsed material can be in particulate or in a sheet- like form.

L'invention concerne un matériau poreux destiné à absorber des fluides biologiques aqueux et comprenant un polymère superabsorbant pouvant gonfler lors de l'absorption des liquides aqueux et formant une structure poreuse dont le rapport surface/volume est d'au moins 0,2m2/g. Ce matériau poreux se caractérise en ce que les pores de la structure poreuse sont comprimés jusqu'à au moins un tiers de leur volume expansé avant d'être humidifiés par les liquides biologiques aqueux; et en ce que les pores se dilatent au moment où ils sont humidifiés par les liquides aqueux. Le matériau comprimé peut se présenter sous forme d'une matière particulaire ou d'une feuille.

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