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AssigneeEvonik Stockhuasen GmbH
InventorsJörg Harren, Helmut Brehm, Andreas Kerkmann, Stephan Ramlow
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A process for producing an absorbent polymer structure (Pa) by treating the outer portion of an untreated absorbent polymer structure (Pu1). The process includes the step of bringing the outer portion of the untreated absorbent polymer structure (Pu1) into contact with an aqueous solution including at least one chemical cross-linker and at least one inorganic compound in dispersed colloidal form. The process also includes the step of heating the absorbent polymer structure, of which the outer portion has been brought into contact with the aqueous solution, at a temperature within a range from about 40 to about 300° C., so that the outer portion of the absorbent polymer structure is more strongly cross-linked in comparison to the inner portion and the inorganic compound is at least partly immobilized in the outer portion of the absorbent polymer structure.
An absorbent polymer structure (Pa), comprising an inner portion as well as an outer portion surrounding the inner portion, wherein the inner portion comprises a crosslinked polymer and the outer portion comprises a crosslinked polymer, wherein the polymer of the outer portion is more strongly cross-linked than the polymer of the inner portion, wherein the polymer of the outer portion is surface crosslinked with an aqueous solution comprising a chemical cross-linker, and an inorganic compound comprising silicic acid, and heating the absorbent polymer structure to a temperature of from about 40 to about 300° C., wherein said inorganic compound is at least partly immobilized in the polymer of the outer portion and wherein the absorbent polymer structure (Pa) has a CRC of at least about 26 g/g and a SFC of at least about 60·10−7 cm3·s·g−1.
A process for producing an absorbent polymer structure (Pa) by treating an outer portion of an untreated absorbent polymer structure (Pu1), comprising the steps of:
A process for producing an absorbent polymer structure (Pa) by treating the outer portion of an absorbent polymer structure (Pu2), that has not been treated with an inorganic compound in dispersed colloidal form, comprising the steps of:
Dependencies are inferred from the claim text.