Cross-linking of hydrogels with phosphoric acid esters

Details Cross-linking of hydrogels with phosphoric acid esters Cross-linking of hydrogels with phosphoric acid esters

C - Chemistry, Metallurgy

08

F

C08F 8/40 (2006.01) A61L 15/00 (2006.01) A61L 15/60 (2006.01) C08J 3/24 (2006.01) D06M 15/263 (2006.01)

Patent

CA 2319457

The invention relates to a method for the surface secondary cross-linking of water-absorbent polymers, according to which the polymer is sprayed with a solution for surface secondary cross-linking. As cross-linking agent said solution contains phosphoric acid esters of the formula (1) or (2), where X is OH or NH2 and R is C1-C12 alkylene, or a mixture of such esters dissolved in an inert solvent. The moist product during or after spraying is subjected to secondary cross-linking and dried by raising the temperature to 50-250 ~C. The invention also relates to water-absorbent polymers obtainable in accordance with the above method and to their use in hygiene articles, packing materials and non-woven materials.

L'invention concerne un procédé pour la post-réticulation en surface de polymères hydroabsorbants, dans lequel le polymère est aspergé d'une solution permettant la post-réticulation en surface. Comme agent de réticulation, cette solution contient des esters phosphoriques de la formule (1) ou (2), où X représente OH ou NH¿2?, et R représente alkylène C¿1?-C¿12?, ou encore un mélange de ces esters dissous dans un solvant inerte. Pendant ou après l'aspersion, le produit humecté subit une post-réticulation et est séché par élévation de la température à une valeur comprise entre 50 et 250 ·C. L'invention concerne des polymères hydroabsorbants obtenus selon le procédé précité, ainsi que leur utilisation dans des produits d'hygiène, des matériaux d'emballage et des non-tissés.

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