Patent US4017653A successfully refreshed from Google Patents.
US4017653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent articles and methods for their preparation
Assignee: Dow Chemical Co
•
Filing: 1975-05-01
•
Granted: 1977-04-12
•
Expires: 1995-05-01
Abstract
Abstract Water swellable absorbent articles, made from carboxylic polyelectrolytes, together with methods for their preparation, and a composition useful to make said articles are disclosed. The articles are crosslinked by heating and/or removing substantially all of the water from the precursor composition. The absorbent articles are useful as surgical sponges, diapers, tampons, meat trays, bath mats, and the like.
Inventors
- 👤 James R. Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:32
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/16; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
63 words
A method of preparing an absorbent article coated with a substantially dry water swellable polyelectrolyte which comprises a. applying a coating on a relatively thin article wherein the coating comprises 1. a solution of a carboxylic synthetic polyelectrolyte wherein the solution consists of water, lower alcohols, or mixtures thereof and about 5 to about 60% by weight of a carboxylic polyelectrolyte, and 2.
Claim 2
Independent Claim
63 words
A method of preparing an absorbent article coated with a substantially dry water swellable polyelectrolyte which comprises a. applying a coating on a relatively thin article wherein the coating comprises 1. a solution of a carboxylic synthetic polyelectrolyte wherein the solution consists of water, lower alcohols, or mixtures thereof and about 5 to about 60% by weight of a carboxylic polyelectrolyte, and 2.
Claim 3
Dependent Claim
29 words
at least about 0.1% by weight based on the polyelectrolyte of a crosslinking agent reactive with carboxylate groups, B. heating said coated article to a temperature greater than about
Claim 4
Dependent Claim
29 words
at least about 0.1% by weight based on the polyelectrolyte of a crosslinking agent reactive with carboxylate groups, B. heating said coated article to a temperature greater than about
Claim 5
Dependent Claim
23 words
30° C. to crosslink said polyelectrolyte. 2. The method of claim 1 wherein the article is a natural or a synthetic fibrous substrate.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the article is a synthetic film.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein the article is a foamed polymer.
Claim 8
Dependent Claim
10 words
The coated article produced by the method of claim 1.
Claim 9
Dependent Claim
10 words
The coated article produced by the method of claim 2.
Claim 10
Dependent Claim
10 words
The coated article produced by the method of claim 3.
Claim 11
Dependent Claim
10 words
The Coated article produced by the method of claim 4.
Claim 12
Dependent Claim
23 words
A method as set forth in claim 1 wherein the crosslinking agent is present in the range from 0.1 - 10% by weight.
Claim 13
Dependent Claim
31 words
A method as set forth in claim 1 wherein the carboxylic polyelectrolyte consists of a terpolymer of ethyl acrylate, sodium acrylate, and sodium methacrylate with 50 mole percent being ethyl acrylate.
Claim 14
Dependent Claim
16 words
A method as set forth in claim 1 wherein the carboxylic polyelectrolyte consists of polysodium acrylate.
Claim 15
Dependent Claim
16 words
A method as set forth in claim 1 wherein the carboxylic polyelectrolyte consists of poly(isobutylenecodisodium maleate).
Claim 16
Dependent Claim
19 words
A method as set forth in claim 1 wherein the crosslinking agent is the diglycidyl ether of polypropylene glycol.
Claim 17
Dependent Claim
24 words
The method as set forth in claim 1 wherein said crosslinking agent is selected from polyhaloalkanols, sulfonium zwitterions, haloepoxyalkanes, polyglycidyl ethers, and mixtures thereof.
Claim 18
Dependent Claim
16 words
The method as set forth in claim 1 wherein the crosslinking agent is a polyglycidyl ether.
References Cited (Backward Citations)
US3245933A
Cited
US3467604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |