Hydrolytically stable postcrosslinked superabsorbents

Details Hydrolytically stable postcrosslinked superabsorbents Hydrolytically stable postcrosslinked superabsorbents

2006-02-24

2010-06-01

Choi, Ling-Siu (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S329700, C525S330300, C525S383000, C525S371000

Reexamination Certificate

active

07728079

ABSTRACT:
The present invention relates to a process for producing postcrosslinked water-absorbing polymeric formations, comprising the steps of contacting water-absorbing polymeric formations P1obtained by polymerization of ethylenically unsaturated acid-functional monomers or salts thereof in the presence of a crosslinker with a fluid F1comprising a postcrosslinker,heating the water-absorbing polymeric formations in contact with the fluid F1to a temperature in a range from 40 to 300° C. to obtain postcrosslinked water-absorbing polymeric formations P2,the water-absorbing polymeric formations P1having a thermal stability, as determined in accordance with the test method described herein, of less than 3.0%. The invention also relates to water-absorbing polymeric formations, to the water-absorbing polymeric formations obtainable by this process, to water-absorbing polymeric formations based on crosslinked carboxyl-bearing monomers, to a composite comprising water-absorbing polymeric formations and a substrate, to a process for producing a composite, to a composite obtainable by this process, to chemical products comprising water-absorbing polymeric formations or a composite, to the use of water-absorbing polymeric formations or of a composite in chemical products and also to the use of triallyl isocyanurate as an internal crosslinker in the production of water-absorbing polymeric formations based on crosslinked carboxyl-bearing monomers.

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