Crosslinked polyamine coating on superabsorbent hydrogels
AssigneeBASF SE
InventorsMichael M. Azad, Norbert Herfert, Michael Mitchell, Jim Robinson
Life of this patent
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Abstract
The invention concerns superabsorbent particles with a shell, wherein said shell comprises a cationic polymer crosslinked by the addition of crosslinker and adhered to hydrogel-forming polymer obtainable by applying a coating solution, containing both a cationic polymer and crosslinker, to hydrogel-forming polymer having a residual water content of less than 10 w %, their production and use.
Claims43
A composite comprising a fibrous substrate and superabsorbent particles having a shell, wherein said shell comprises a cationic polymer crosslinked by the addition of a crosslinker and adhered to a hydrogel-forming polymer having a residual water content of less than 10 wt %, said particles prepared by applying a coating solution, containing the cationic polymer and the crosslinker, to the hydrogel-forming polymer, wherein the hydrogel-forming polymer is neutralized at least 50 mole percent and the cationic polymer comprises a polyamine or a polyimine material.
An air-laid article comprising superabsorbent particles having a shell, wherein said shell comprises a cationic polymer crosslinked by the addition of a crosslinker and adhered to a hydrogel-forming polymer having a residual water content of less than 10 wt %, said particles prepared by applying a coating solution, containing the cationic polymer and the crosslinker, to the hydrogel-forming polymer, wherein the hydrogel-forming polymer is neutralized at least 50 mole percent and the cationic polymer comprises a polyamine or a polyimine material.
An absorbent article comprising (a) a liquid pervious top sheet, (b) a liquid impervious back sheet, and (c) an absorbent core positioned between said top sheet and said back sheet, wherein said absorbent core comprises particles comprising a fibrous substrate and superabsorbent particles having a shell, wherein said shell comprises a cationic polymer crosslinked by the addition of a crosslinker and adhered to a hydrogel-forming polymer having a residual water content of less than 10 wt %, said particles prepared by applying a coating solution, containing the cationic polymer and the crosslinker, to the hydrogel-forming polymer, wherein the hydrogel-forming polymer is neutralized at least 50 mole percent and the cationic polymer comprises a polyamine or a polyimine material.
Dependencies are inferred from the claim text.