Mixed-bed ion-exchange hydrogel-forming polymer compositions...

C - Chemistry – Metallurgy – 08 – L

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C08L 101/14 (2006.01) A61L 15/60 (2006.01)

Patent

CA 2280771

Disclosed are compositions comprising at least one cationic ion-exchange hydrogel-forming polymer and at least one anionic ion-exchange hydrogel-forming polymer, wherein the composition exhibits improved absorbency characteristics relative to comparable mixtures of the hydrogel-forming polymers in their neutralized state. Also disclosed are mixed-bed ion-exhange compositions having improved Performance Under Pressure values relative to prior mixed-bed compositions, which, e.g., alleviate detrimental gel blocking incurred with these prior systems. Also disclosed are absorbent members useful in the containment of body fluids such as urine, that have at least one region comprising a mixed-bed ion-exchange hydrogel-forming absorbent polymer composition in a concentration of from about 60 to 100% by weight.

L'invention concerne des compositions contenant au moins un polymère formant un hydrogel échangeur d'ions cationiques et au moins un polymère formant un hydrogel échangeur d'ions anioniques. Les compositions présentent des capacités d'absorption améliorées par rapport aux mélanges comparables de polymères formant un hydrogel dans leur état neutralisé. Font aussi l'objet de cette invention des compositions échangeuses d'ions à lits mélangés ayant des valeurs de performance sous pression améliorées par rapport aux compositions à lits mélangés déjà connues qui, par exemple, atténuent un blocage nuisible par gonflement du gel se produisant dans les systèmes antérieurs. Des éléments absorbants, faisant également l'objet de cette invention, sont utilisés pour la rétention de liquides organiques, tels que l'urine, et possèdent au moins une région comprenant une composition de polymères absorbants formant un hydrogel échangeur d'ions à lits mélangés dont la concentration est d'environ 60 à 100 % en poids.

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