Postcrosslinking of hydrogels using boric esters

Details Postcrosslinking of hydrogels using boric esters Postcrosslinking of hydrogels using boric esters

C - Chemistry, Metallurgy

08

J

C08J 3/24 (2006.01) B01J 20/26 (2006.01) C08F 8/42 (2006.01) C08K 5/10 (2006.01) C08L 101/14 (2006.01) A61F 13/15 (2006.01)

Patent

CA 2319455

The invention relates to a method for the surface secondary cross-linking of water-absorbent polymers by treatment of the polymers with a solution for surface secondary cross-linking. According to said method the polymers during or after spraying are subjected to secondary cross-linking and dried by raising the temperature to 50-250 ~C and the cross-linking agent contains a boric acid ester with a bivalent or trivalent alcohol dissolved in an inert solvent. 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 par traitement de ces derniers avec une solution permettant la post-réticulation en surface. Pendant ou après l'aspersion, les polymères subissent une post-réticulation et sont séchés par élévation de la température à une valeur comprise entre 50 et 250 ·C, et l'agent de réticulation renferme un ester de l'acide borique avec un alcool bivalent ou trivalent dissous dans un solvant inerte. L'invention concerne également des polymères hydroabsorbants s'obtenant selon le procédé précité, ainsi que leur utilisation dans des articles d'hygiène, des matériaux d'emballage et des non-tissés.

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