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US 3,959,569 AGranted
Preparation of water-absorbent articles
AssigneeThe Dow Chemical Company
InventorNelson D. Burkholder, Jr.
Life of this patent
Estimating the term…
Abstract
Water-absorbent articles are prepared by contacting a fibrous material with a dry granular or powdered water-swellable gel and steaming the mixture. Adherence of the gel is improved by pretreatment of the fibrous base with a cationic polymer such as polyethylenimine. Fabrics or fluffs coated with particulate gels such as crosslinked partially hydrolyzed polyacrylamide are useful in various applications where it is desirable to hold or absorb an aqueous fluid in a particular location.
Claims11
A process for preparing water-absorbent articles consisting essentially of:
- a. distributing a dry granular/powdered water-swellable cross-linked polymeric gel onto/into a fibrous material, and
- b. subjecting the so-contained fibrous material to the action of steam for a period of time and at a pressure and temperature to soften at least the surface of the gel,
- thereby to cause the gel to become sticky and to firmly adhere to the fibrous material.
Dependencies are inferred from the claim text.