Hydrophilic, highly swellable hydrogels
AssigneeClariant GmbH
InventorsFritz Engelhardt, Uwe Stuven, Thomas Daniel, Norbert Herfert
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Abstract
The present invention relates to hydrophilic, highly swellable hydrogels which are coated with nonreactive, water-insoluble waxes in a quantity of from about 0.05 to about 2% by weight, based on uncoated hydrogel.
Claims16
A hydrophilic, highly swellable hydrogel, comprising a cross-linked hydrogel coated with about 0.05 to about 2% by weight of a non-reactive, water insoluble wax, the quantity of the wax is based on the quantity of the uncoated cross-linked hydrogel.
A process for the preparation of a cross-linked hydrogel comprising applying a non-reactive, water-insoluble wax to a hydrophilic, highly swellable cross-linked base hydrogel.
A method of reducing the dusting of a hydrophilic, highly swellable cross-linked hydrogel, comprising coating a cross-linked hydrogel with a wax in a quantity of from about 0.05% by weight to about 2% by weight, based on the uncoated cross-linked hydrogel.
Dependencies are inferred from the claim text.