Patent ID: 7754822

Claim:
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 R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , and R 9 are each independently hydrogen, C 1 -C 12 -alkyl, C 2 -C 12 -alkenyl, or C 6 -C 12 -aryl, wherein C 1 -C 12 -alkyl, C 2 -C 12 -alkenyl, or C 6 -C 12 -aryl may be halogen substituted.