| US 7,541,395 B2 | ||
| Two-step mixing process for producing an absorbent polymer | ||
| Armin Reimann, Willich (Germany); Manfred Van Stiphoudt, Kempen (Germany); and Herbert Vorholt, Haltern (Germany) | ||
| Assigned to Evonik Stockhausen GmbH, Krefeld (Germany) | ||
| Appl. No. 10/532,401 PCT Filed Oct. 24, 2003, PCT No. PCT/EP03/11830 § 371(c)(1), (2), (4) Date Aug. 19, 2005, PCT Pub. No. WO2004/037900, PCT Pub. Date May 06, 2004. |
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| Claims priority of application No. 102 49 822 (DE), filed on Oct. 25, 2002. | ||
| Prior Publication US 2006/0057389 A1, Mar. 16, 2006 | ||
| Int. Cl. B32B 9/04 (2006.01); C08F 118/02 (2006.01); B01F 3/08 (2006.01) | ||
| U.S. Cl. 523—346 [526/319; 428/411.1] | 14 Claims |
| 1. A process for producing an absorbent polymer composition comprising the steps of:
a first mixing event, wherein a plurality of absorbent polymer particles are mixed with a liquid in a mixer; and
a second mixing event, wherein the liquid is distributed within the polymer particles;
wherein the polymer particles in the first mixing event are mixed with a first mixing speed, and the polymer particles in
the second mixing event are stirred with a lower speed than in the first mixing event; and
wherein the first mixing event is a continuous mixing process
wherein in the first mixing event the polymer particles are back-mixed in such a way that a flow of the new polymer particles
entering in the mixer is overlaid by a flow of polymer particles already present in the mixer and opposed to this flow, wherein
the ratio of the opposed flow to the flow of newly entering polymer particles averages about 5 to about 50% by wt.
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