초록 ▼

A process for producing and a powdery water-absorbing polymers comprising: about 0.01 to 20 wt. % of a fine particle with a particle size of less than about 200 μm; about 0.001 to 10 wt. % of a thermoplastic adhesive; and about 60 to 99.998 wt. % of a water-a

A process for producing and a powdery water-absorbing polymers comprising: about 0.01 to 20 wt. % of a fine particle with a particle size of less than about 200 μm; about 0.001 to 10 wt. % of a thermoplastic adhesive; and about 60 to 99.998 wt. % of a water-absorbing polymer particle with a particle size of about 200 μm and above, wherein the powdery water-absorbing polymers have: a flow value (FFC) within the range from about 1 to 13, and/or a dust portion of at most about 6 are disclosed. Also disclosed are a transport process, a composite, chemical products, and a use of a thermoplastic adhesive.

대표청구항 ▼

The invention claimed is: 1. Treated water-absorbing polymer particles comprising: from about 0.01 to about 20 percent by weight of the polymer of a fine particle with a particle size of less than about 200 μm; from about 0.001 to less than 0.3 percent by weight of the polymer of a thermoplas

The invention claimed is: 1. Treated water-absorbing polymer particles comprising: from about 0.01 to about 20 percent by weight of the polymer of a fine particle with a particle size of less than about 200 μm; from about 0.001 to less than 0.3 percent by weight of the polymer of a thermoplastic adhesive; and from about 60 to about 99.998 percent by weight of the polymer of a water-absorbing polymer particle with a particle size of about 200 μm and above, wherein wherein the treated water-absorbing polymer particles are prepared by a production process and the fine particles are bound to the surface of the water-absorbing polymer particles by the thermoplastic adhesive during the production process for the treated water-absorbing polymer particles, and the treated water-absorbing polymer particles have either a flow value (FFC) comprising from about 1 to about 13 according to the Determination of the FFC Value set forth in the present application, or a dust portion comprising at most about 6 according to the Determination of the Dust Portion method set forth in the present application. 2. The treated water-absorbing polymer particles according to claim 1, wherein the flow value (FFC) comprises from about 1 to about 13 and the dust portion comprises at most about 6, respectively based on the total weight of the powdery water-absorbing polymers. 3. The treated water-absorbing polymer particles according to claim 1, wherein the thermoplastic adhesive has a melt temperature according to ISO 11357 of at least about 50° C. 4. The treated water-absorbing polymer particles according to claim 1, wherein the thermoplastic adhesive has a melt viscosity according to Brookfield (ASTM E 28) with a number 27 spindle at a temperature of about 160° C. and less than about 2000 Pas. 5. The treated water-absorbing polymer particles according to claim 1, wherein the thermoplastic adhesive comprises at least about 10 percent by weight of the adhesive of a polycondensate. 6. The treated water-absorbing polymer particles according to claim 5, wherein the polycondensate comprises a polyester. 7. The treated water-absorbing polymer particles according to claim 1, wherein at least about 80 percent by weight of the fine particle comprises an inorganic fine particle. 8. The treated water-absorbing polymer particles according to claim 1, wherein the water-absorbing polymers include secondary crosslinking in a surface region. 9. The treated water-absorbing polymer particles according to claim 8, wherein the surface crosslinking in the surface region comprises crosslinking effected by at least one organic compound or at least one polyvalent metal cation. 10. Treated water-absorbing particles obtainable by a process comprising the steps of: providing from about 0.01 to about 20 percent by weight of a fine particle with a particle size of less than about 200 μm; providing from about 0.001 to about 0.3 percent by weight of a thermoplastic adhesive; providing from about 60 to about 99.998 percent by weight of a water-absorbing polymer particle with a particle size of about 200 μm and above; and wherein the treated water-absorbing polymer particles are prepared by a production process, and contacting the fine particle, the thermoplastic adhesive, and the water-absorbing polymer particle with each other at a temperature comprising from about 120 to about 250° C. during the production process for the treated water-absorbing polymer particles. 11. The treated water-absorbing polymer particles according to claim 10 comprising at least one of the following properties: P1 a flow value (FFC) comprising from about 1 to about 13; or P2 a dust portion comprising at most about 6, P3 an attrition index Ai, comprising from about 1 to about 17; P4 an attrition difference Ad comprising from 0 to about 7; or P5 a retention determined according to ERT 441.1-99 comprising at least about 20 g/g. 12. The treated water-absorbing polymer particles according to claim 1, wherein at least about 50 percent by weight of the powdery water-absorbing polymers have a particle size comprising from about 50 to about 2,000 μm. 13. A composite comprising the treated water-absorbing polymer particles according to claim 1. 14. A chemical product comprising the treated water-absorbing polymer particles according to claim 1. 15. The treated water-absorbing polymer particles according to claim 8, wherein the water-absorbing polymer particles are contacted with the thermoplastic adhesive and the fine particles during a secondary cross-linking of the water-absorbing polymer particles. 16. A process for producing treated water-absorbing polymer particles comprising the steps of: providing from about 0.01 to about 20 percent by weight of a fine particle with a particle size of less than about 200 μm; providing from about 0.001 to less than 0.3 percent by weight of a thermoplastic adhesive; providing from about 60 to about 99.998 percent by weight of a water-absorbing polymer particle with a particle size of about 200 μm and above; and contacting the fine particle, the thermoplastic adhesive, and the water-absorbing polymer particle with each other at a temperature comprising from about 120 to about 250° C. wherein the treated water-absorbing polymer particles have either a flow value (FFC) comprising from about 1 to about 13 according to the Determination of the FFC Value set forth in the present application, or a dust portion comprising at most about 6 according to the Determination of the Dust Portion method set forth in the present application. 17. The process for producing treated water-absorbing polymer particles according to claim 16, wherein the contacting occurs in a continuously conveying mixing oven. 18. The process for producing treated water-absorbing polymer particles according to claim 17 wherein the oven comprises movable, heated conveying means. 19. The process for producing treated water-absorbing polymer particles according to claim 16 further comprising providing a secondary crosslinker and contacting the secondary crosslinker with any one of the fine particle, the thermoplastic adhesive, the water-absorbing polymer particle, or any combination of any of the preceding. 20. The process for producing treated water-absorbing polymer particles according to claim 19 wherein the contacting comprises contacting the secondary crosslinker and the thermoplastic adhesive with the fine particle and the water-absorbing polymer particle. 21. The process for producing treated water-absorbing polymer particles according to claim 19 wherein at least the secondary crosslinker comprises a liquid phase. 22. The treated water-absorbing polymer particles according to claim 1, wherein the flow value (FFC) or dust portion in said powdery water-absorbing polymer is altered by the process comprising adding a thermoplastic adhesive to the powdery water-absorbing polymer. 23. The treated water-absorbing polymer particles according to claim 1, wherein said treated water-absorbing polymer particles are transported according to a transport process comprising flowing the treated water-absorbing polymer particles according to claim 1 through a channel. 24. The treated water-absorbing polymer particles according to claim 1, wherein the flow value (FFC) or dust portion in said powdery water-absorbing polymer is altered by a process comprising adding a thermoplastic adhesive to the powdery water-absorbing polymer.