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US3980663A
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US
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Absorbent articles and methods for their preparation from crosslinkable solutions of synthetic carboxylic polyelectrolytes
Assignee: Dow Chemical Co
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Filing: 1974-05-09
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Granted: 1976-09-14
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Expires: 1994-05-09
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
2026-10-24 14:49
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/16; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A composition useful to form water swellable absorbent articles which comprises 1. a solution of a carboxylic synthetic polyelectrolyte wherein the solution comprises water, lower alcohols, or mixtures thereof and about 5 to about 60% by weight of a carboxylic polyelectrolyte containing sufficient carboxylate functionality to impart water-solubility to the salt form, and 2. at least about 0.1% by weight based on the polyelectrolyte of a difunctional crosslinking agent reactive with carboxylate groups through nucleophilic displacement.
Claim 2
Dependent Claim
76 words
A composition useful to form water swellable absorbent articles which comprises 1. a solution of a carboxylic synthetic polyelectrolyte wherein the solution comprises water, lower alcohols, or mixtures thereof and about 5 to about 60% by weight of a carboxylic polyelectrolyte containing sufficient carboxylate functionality to impart water-solubility to the salt form, and 2. at least about 0.1% by weight based on the polyelectrolyte of a difunctional crosslinking agent reactive with carboxylate groups through nucleophilic displacement.
Claim 3
Dependent Claim
24 words
The composition as set forth in claim 1 wherein said crosslinking agent is selected from polyhaloalkanols, sulfonium zwitterions, haloepoxyalkanes, polyglycidyl ethers, and mixtures thereof.
Claim 4
Dependent Claim
16 words
The composition as set forth in claim 1 wherein the crosslinking agent is a polyglycidyl ether.
Claim 5
Dependent Claim
38 words
A method of preparing a water swellable polyelectrolyte which comprises the steps of 1. preparing a composition as set forth in claim 1, 2. evaporating about 75% of the solvent therefrom to obtain a substantially dry water-swellable polyelectrolyte.
Claim 6
Dependent Claim
37 words
A method of preparing a swellable polyelectolyte which comprises the steps of 1. preparing a composition as set forth in claim 2, 2. evaporating about 75% of the solvent therefrom to obtain a substantially dry water-swellable polyelectrolyte.
Claim 7
Dependent Claim
37 words
A method of preparing a swellable polyelectrolyte which comprises the steps of 1. preparing a composition as set forth in claim 3, 2. evaporating about 75% of the solvent therefrom to obtain a substantially dry water-swellable polyelectrolyte.
Claim 8
Dependent Claim
23 words
A composition as set forth in claim 1 wherein the crosslinking agent is present in the range from 0.1 - 10% by weight.
Claim 9
Dependent Claim
31 words
A composition 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 10
Dependent Claim
16 words
A composition as set forth in claim 1 wherein the carboxylic polyelectrolyte consists of polysodium acrylate.
Claim 11
Dependent Claim
16 words
A composition as set forth in claim 1 wherein the carboxylic polyelectrolyte consists of poly(isobutylenecodisodium maleate).
Claim 12
Dependent Claim
19 words
A composition as set forth in claim 3 wherein the cross-linking agent is the diglycidyl ether of polypropylene glycol.
References Cited (Backward Citations)
US3245933A
Cited
US3224986A
Cited
US3514419A
Cited
US3669103A
Cited
US3810468A
Cited
US3812070A
Cited
US3875697A
Cited
US3903056A
Cited
US3926891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |