Biodegradable, super absorbent polymer hydrogels and a...

C - Chemistry – Metallurgy – 08 – B

Patent

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C08B 15/00 (2006.01) C08B 11/20 (2006.01) C08J 3/075 (2006.01) C08J 3/24 (2006.01) C08L 1/28 (2006.01)

Patent

CA 2591801

The invention relates to a method for the preparation of a superabsorbent polymer hydrogel, comprising the steps of (i) crosslinking a 3% overall aqueous solution of carboxymethylcellulose sodium salt and hydroxyethylcellulose with 5% carbodiimide, in the presence of an acid catalyst; (ii) washing the gel obtained at least once by swelling in a polar organic solvent; and (iii) drying the gel by phase inversion in a non-solvent for cellulose. The invention further concerns the superabsorbent hydrogels obtainable by said method and the uses thereof .

L'invention porte sur un procédé de préparation d'un hydrogel polymère superabsorbant, ce procédé consistant à (i) réticuler 3 % de la globalité d'une solution aqueuse d'un sel de sodium carboxyméthylcellulose et d'hydroxyéthylcellulose avec 5 % d'un carbodiimide en présence d'un catalyseur acide; (ii) laver le gel obtenu au moins une fois en le laissant gonfler dans un solvant organique polaire et (iii) sécher le gel par inversion de phase dans un non solvant destiné à la cellulose. L'invention porte également sur les hydrogels superabsorbants pouvant être obtenus par ce procédé et sur ses utilisations.

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