Preparation of highly permeable, superabsorbent polymer structures

摘要

The present invention relates to a superabsorber composition comprising
an at least surface-crosslinked, water-absorbing polymer structure having a structure surface,a large number of fine particles at least partly immobilized on the structure surface.;The invention furthermore relates to a process for the preparation of a superabsorber composition, the superabsorber composition obtainable by this process, a composite comprising the superabsorber composition according to the invention, a process for the production of a composite, the composite obtainable by this process, the use of the superabsorber composition according to the invention in chemical products and chemical products comprising the superabsorber composition according to the invention or the composite according to the invention.

主权项

1. A superabsorber composition consisting of:
a) a surface-crosslinked, water-absorbing polymer structure having a structure surface, b) from about 0.01 to about 5 wt % based on the weight of the water-absorbing polymer structures of a solid powder selected from aluminium salts having an average particle diameter in the range of from about 100 to about 600 μm wherein the solid powder is at least partly immobilized on the structure surface of the surface-crosslinked, water-absorbing polymer; and c) a binder selected from polypropylene glycols or polyethylene glycols, wherein the binder has a weight-average molecular weight Mw in a range of from about 5,000 to about 1,000,000 g/mol and said binder is a solid at 20° C., wherein the binder immobilizes the solid powder on the structure surface of the surface-crosslinked, water-absorbing polymer; and wherein the weight ratio of the solid powder of b) and the binder of c) is from about 10:1 to about 2:1, and wherein the elements b) and c) are applied to the structure surface of the surface-crosslinked, water-absorbing polymer structure, and wherein the solid powder are immobilized by said binder, and wherein the superabsorber composition has an SFC value, determined in accordance with the test method described herein, of from about 50×10−7 cm3s/g to about 100×10−7 cm3s/g.