US4154898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent articles and methods for their preparation
Assignee: Dow Chemical Co
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Filing: 1977-10-17
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Granted: 1979-05-15
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Expires: 1997-10-17
Abstract
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.
Inventors
- 👤 Nelson D. Burkholder, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:07
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J9/00; C08J9/36; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/08; C08J2400/00; C08J2400/14; C08L; C08L79/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
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.
Claim 2
Independent Claim
95 words
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.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the article is a natural or a synthetic fibrous substrate.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the article is a synthetic film.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the article is a foamed polymer.
Claim 6
Dependent Claim
10 words
The coated article produced by the method of claim 1.
Claim 7
Dependent Claim
10 words
The coated article produced by the method of claim 2.
Claim 8
Dependent Claim
10 words
The coated article produced by the method of claim 3.
Claim 9
Dependent Claim
10 words
The coated article produced by the method of claim 4.
References Cited (Backward Citations)
US2832747A
Cited
US3224986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |