Super absorbent foams, and method for producing the same

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/28 (2006.01) A61F 13/15 (2006.01) A61L 15/26 (2006.01) A61L 15/28 (2006.01) A61L 15/32 (2006.01) A61L 15/42 (2006.01) A61L 15/60 (2006.01)

Patent

CA 2189961

An absorbent, microporous foam comprising a crosslinked polymer having interconnected fluid cells distributed throughout its mass, wherein the fluid cells have a diameter of between about 0.1 and about 100 µm, and wherein the foam can rapidly absorb at least about twice its dry weight in fluid, is disclosed. A method for producing a microporous, absorbent foam is also disclosed. This method comprises the steps of: (a) mixing a cross-linkable polymer and a first solvent to form a stable solution wherein the stable solution can be induced to phase separate; (b) inducing the stable solution to phase separate into a polymer-concentrated phase and a polymer-dilute phase after a predetermined period of time; (c) inducing crosslinking of said polymer, so that the polymer will crosslink in said concentrated phase for a predetermined period of time during phase separation to thereby form a microporous material; and (d) drying the microporous materail to produce the absorbent foam.

L'invention concerne une mousse absorbante microporeuse comprenant un polymère réticulé présentant des cellules à fluide interconnectées réparties dans la totalité de sa masse, dans laquelle les cellules à fluide présentent un diamètre compris entre environ 0,1 et environ 100 µm, ladite mousse pouvant absorber rapidement au moins environ deux fois son poids sec de fluide. L'invention concerne également un procédé de production d'une mousse microporeuse absorbante comprenant les étapes consistant: (a) à mélanger un polymère réticulable et un premier solvant afin de former une solution stable, de sorte que la solution stable peut être amenée à une séparation de phase, (b) à induire une séparation des phases de la solution stable en une phase concentrée en polymère et une phase à dilution de polymères après une durée prédéterminée, (c) à induire la réticulation dudit polymère de sorte qu'il se réticule dans ladite phase concentrée pendant une durée prédéterminée au cours de la séparation de phases, pour ainsi former une matière microporeuse, et (d) à sécher la matière microporeuse afin de produire la mousse absorbante.

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