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US 4,154,898 AGranted
Absorbent articles and methods for their preparation
AssigneeThe Dow Chemical Company
InventorNelson D. Burkholder, Jr.
Life of this patent
Estimating the term…
Abstract
Water swellable absorbent articles, made from solutions of carboxylic polyelectrolytes, together with methods for their preparation, and a composition useful to make said articles are disclosed. The articles are cured and/or crosslinked with polyamide-polyamine epichlorohydrin adducts by heating and/or removing substantially all of the solvent from the precursor composition. The absorbent articles are useful as surgical sponges, diapers, tampons, meat trays, bath mats and the like.
Claims8
A method of preparing an absorbent article coated with a substantially dry water swellable polyelectrolyte which comprises
- (1) preparing a composition which comprises a solution of
- (A) water, lower alcohols, and mixtures thereof,
- (B) about 5 to about 60% by weight based on the amount of (A) of a carboxylic polyelectrolyte or mixtures thereof, and
- (C) an amount of a water soluble polyamidopolyamine/epichlorohydrin adduct sufficient to cure said polyelectrolyte into a water swellable article,
- (2) applying a coating of said composition on a relatively thin article,
- (3) drying said coated article to crosslink said polyelectrolyte.
3 more elements
Dependencies are inferred from the claim text.