Method for the secondary crosslinking of hydrogels with bicyclic amide acetals
AssigneeBASF SE
InventorsThomas Daniel, Ulrich Riegel, Mark Elliott, Ubbo von Oehsen, Kai Michael Exner, Klemens Massonne
Life of this patent
Estimating the term…
Abstract
A process for postcrosslinking a water-absorbing polymer comprises said polymer being treated with a postcrosslinker and, during or after said treating, being postcrosslinked and dried by temperature elevation, said postcrosslinker being a compound of the formula I where R1, R2, R3, R4, R5, R6, R7, R8 and R9 are each independently hydrogen, C1-C12-alkyl, C2-C12-alkenyl or C6-C12-aryl, wherein C1-C12-alkyl, C2-C12-alkenyl or C6-C12-aryl may be halogen substituted. The liquid-absorbing polymers are useful in hygiene articles and packaging materials.
Claims12
A process for postcrosslinking a water-absorbing polymer, which process comprises treating said polymer with a postcrosslinker and, during or after said treating, postcrosslinking and drying by temperature elevation, said postcrosslinker being a compound of a formula (I)
- wherein R1, R2, R3, R4, R5, R6, R7, R8, and R9 are each independently hydrogen, C1-C12-alkyl, C2-C12-alkenyl, or C6-C12-aryl, wherein C1-C12-alkyl, C2-C12-alkenyl, or C6-C12-aryl may be halogen substituted.
Dependencies are inferred from the claim text.