초록 ▼

The present invention relates to a process for producing postcrosslinked water-absorbing polymeric formations, comprising the steps of contacting water-absorbing polymeric formations P1 obtained by polymerization of ethylenically unsaturated acid-functional monomers or salts thereof in the presence

The present invention relates to a process for producing postcrosslinked water-absorbing polymeric formations, comprising the steps of contacting water-absorbing polymeric formations P1 obtained by polymerization of ethylenically unsaturated acid-functional monomers or salts thereof in the presence of a crosslinker with a fluid F1 comprising a postcrosslinker, heating the water-absorbing polymeric formations in contact with the fluid F1 to a temperature in a range from 40 to 300° C. to obtain postcrosslinked water-absorbing polymeric formations P2, the water-absorbing polymeric formations P1 having 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.

대표청구항 ▼

The invention claimed is: 1. A process for producing postcrosslinked water-absorbing polymeric formations, comprising the steps of: a) contacting water-absorbing polymeric formations P1, obtained by polymerization of ethylenically unsaturated acid-functional monomers or salts thereof in the presenc

The invention claimed is: 1. A process for producing postcrosslinked water-absorbing polymeric formations, comprising the steps of: a) contacting water-absorbing polymeric formations P1, obtained by polymerization of ethylenically unsaturated acid-functional monomers or salts thereof in the presence of a triallyl isocyanurate crosslinker, with a fluid F1 comprising a postcrosslinker; b) heating the water-absorbing polymeric formations P1 in contact with the fluid F1 to a temperature in a range from 40 to 300° C. to obtain postcrosslinked water-absorbing polymeric formations P2; wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 3.0%. 2. The process of claim 1, wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 2.0%. 3. The process of claim 1, wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 1.0%. 4. The process of claim 1, wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 0.5%. 5. The process of claim 1, wherein said water-absorbing polymeric formations P1 are obtained in the absence of surface-active agents. 6. The process of claim 1, wherein the surface of said water-absorbing polymeric formations P1 is contacted with a tervalent cation before, during or after postcrosslinking. 7. The process of claim 1, wherein said ethylenically unsaturated acid-functional monomer, are acrylic acid. 8. A process for producing postcrosslinked water-absorbing polymeric formations, comprising the steps of: a) producing water-absorbing polymeric formations P1 by polymerizing ethylenically unsaturated acid-functional monomers or salts thereof in the presence of a triallyl isocyanurate crosslinker, b) drying the water-absorbing polymeric formations of step a) at a temperature in the range of 80 to 200° C.; c) contacting the dried water-absorbing polymeric formations produced in step b) with a fluid F1 comprising a postcrosslinker at a temperature in a range from 40 to 300° C. to obtain postcrosslinked water-absorbing polymeric formations P2; wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 3.0%. 9. The process of claim 8, wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 2.0%. 10. The process of claim 8, wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 1.0%. 11. The process of claim 8, wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 0.5%. 12. The process of claim 8, wherein said water-absorbing polymeric formations P1 are obtained in the absence of surface-active agents. 13. The process of claim 8, wherein the surface of said water-absorbing polymeric formations P1 is contacted with a tervalent cation before, during or after postcrosslinking. 14. A process for producing postcrosslinked water-absorbing polymeric formations, comprising the steps of: a) producing water-absorbing polymeric formations P1, by polymerizing compounds of structure I: wherein R1, R2 and R3 may be the same or different and represent an ethylenically unsaturated hydrocarbon having 2 to 20 carbon atoms; b) contacting the dried water-absorbing polymeric formations produced in step a) with a fluid F1 comprising a postcrosslinker at a temperature in a range from 40 to 300° C. to obtain postcrosslinked water-absorbing polymeric formations P2; wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 3.0%. 15. The process of claim 14, wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 2.0%. 16. The process of claim 14, wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 1.0%. 17. The process of claim 14, wherein the water-absorbing polymeric formations P1 have a thermal stability of less than 0.5%. 18. The process of claim 14, wherein said water-absorbing polymeric formations P1 are obtained in the absence of surface-active agents. 19. The process of claim 14, wherein the surface of said water-absorbing polymeric formations P1 is contacted with a tervalent cation before, during or after postcrosslinking.