US4826880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immobilizing particulate absorbents by conversion to hydrates
Assignee: Johnson and Johnson Inc
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Filing: 1987-09-21
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Granted: 1989-05-02
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Expires: 2007-09-21
Abstract
Abstract The invention relates to absorbent compositions, to methods for handling and immobilizing particulate absorbents, and to absorbent articles produced from the absorbent compositions. Absorbent materials such as cross-linked, water-insoluble and water-swellable particulate polymers are immobilized and safely handled by adding thereto an aqueous liquid such as water or saline in amounts sufficient to form hydrates in which the water comprises from 20% to 80% by weight of the total hydrate. The hydrates may be extruded, sprinkled, or sprayed and can be incorporated into absorbent articles such as diapers and tampons by conventional means. The hydrates unexpectedly increase the total water absorbency of the absorbent on a dry basis.
Inventors
- 👤 John M. Lesniak
- 👤 Franklin Boardman
- 👤 Wayne G. Koci
- 👤 James E. McCann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:42
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179; Y10T428/31794; Y10T428/31797; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31888; Y10T428/31909; Y10T428/31913; Y10T428/31971; Y10T428/31975
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
37 words
An absorbent hydrate in particulate form and comprising a mixture of (a) a particulate water-insoluble, water-swellable absorbent polymer; and (b) from 20% to 80% by weight of the total weight of said hydrate of an aqueous liquid.
Claim 2
Dependent Claim
37 words
An absorbent hydrate in particulate form and comprising a mixture of (a) a particulate water-insoluble, water-swellable absorbent polymer; and (b) from 20% to 80% by weight of the total weight of said hydrate of an aqueous liquid.
Claim 3
Dependent Claim
12 words
The absorbent hydrate of claim 1 wherein said aqueous liquid is water.
Claim 4
Dependent Claim
12 words
The absorbent hydrate of claim 1 wherein said aqueous liquid is saline.
Claim 5
Dependent Claim
32 words
The absorbent hydrate of claim 1 wherein said absorbent polymer is a cross-linked polymer containing a plurality of hydrophilic groups selected from the group consisting of carboxyl, carboxamide, sulfonate salt and hydroxyl.
Claim 6
Dependent Claim
17 words
The absorbent hydrate of claim 1 wherein said absorbent polymer is a polysodium acrylate or polysodium methacrylate.
Claim 7
Dependent Claim
17 words
The absorbent hydrate of claim 1 wherein said absorbent polymer is a polypotassium acrylate or polypotassium methacrylate.
Claim 8
Dependent Claim
17 words
The absorbent hydrate of claim 1 wherein said absorbent polymer is a starch grafted polyacrylate or polymethacrylate.
Claim 9
Dependent Claim
16 words
The absorbent hydrate of claim 1 wherein said absorbent polymer is a cross-linked carboxy methyl cellulose.
Claim 10
Dependent Claim
66 words
An absorbent hydrate in particulate form and comprising a mixture of (a) a cross-linked particulate water-insoluble, water-swellable absorbent polymer selected from the group consisting of a polysodium acrylate, a polysodium methacrylate, polypotassium acrylate, polypotassium methacrylate, a starch grafted polyacrylate, a starch grafted polymethacrylate, and carboxy methyl cellulose; and (b) from 20% to 80% by weight of the total weight of said hydrate of an aqueous liquid.
Claim 11
Dependent Claim
66 words
An absorbent hydrate in particulate form and comprising a mixture of (a) a cross-linked particulate water-insoluble, water-swellable absorbent polymer selected from the group consisting of a polysodium acrylate, a polysodium methacrylate, polypotassium acrylate, polypotassium methacrylate, a starch grafted polyacrylate, a starch grafted polymethacrylate, and carboxy methyl cellulose; and (b) from 20% to 80% by weight of the total weight of said hydrate of an aqueous liquid.
Claim 12
Dependent Claim
20 words
The absorbent hydrate of claim 9 wherein said aqueous liquid is selected from the group consisting of water and saline.
Claim 13
Dependent Claim
24 words
The absorbent hydrate of claim 9 wherein said aqueous liquid comprises from 30% to 50% by weight of the total weight of said hydrate.
Claim 14
Dependent Claim
10 words
An absorbent article containg the absorbent hydrate of claim 1.
Claim 15
Dependent Claim
10 words
An absorbent article containing the absorbent hydrate of claim 9.
Claim 16
Independent Claim
48 words
A method for immobilizing a particulate water-insoluble, water-swellable absorbent polymer comprising combining an aqueous liquid with said polymer in an amount sufficient to form a hydrate in particulate form and wherein the aqueous liquid comprises from 20% to 80% by weight of the total weight of said hydrate.
Claim 17
Independent Claim
48 words
A method for immobilizing a particulate water-insoluble, water-swellable absorbent polymer comprising combining an aqueous liquid with said polymer in an amount sufficient to form a hydrate in particulate form and wherein the aqueous liquid comprises from 20% to 80% by weight of the total weight of said hydrate.
Claim 18
Dependent Claim
11 words
The method of claim 14 wherein said aqueous liquid is water.
Claim 19
Dependent Claim
11 words
The method of claim 14 wherein said aqueous liquid is saline.
Claim 20
Dependent Claim
31 words
The method of claim 14 wherein said absorbent polymer is a cross-linked polymer containing a plurality of hydrophilic groups selected from the group consisting of carboxyl, carboxamide, sulfonate salt and hydroxyl.
Claim 21
Dependent Claim
16 words
The method of claim 14 wherein said absorbent polymer is a polysodium acrylate or polysodium methacrylate.
Claim 22
Dependent Claim
16 words
The method of claim 14 wherein said absorbent polymer is a polypotassium acrylate or polypotassium methacrylate.
Claim 23
Dependent Claim
16 words
The method of claim 14 wherein said absorbent polymer is a starch grafted polyacrylate or polymethacrylate.
Claim 24
Dependent Claim
15 words
The method of claim 14 wherein said absorbent polymer is a cross-linked carboxy methyl cellulose.
Claim 25
Independent Claim
68 words
A method for immobilizing a cross-linked particulate water-insoluble, water-swellable absorbent polymer selected from the group consisting of a polysodium acrylate, a polysodium methacrylate, polypotassium acrylate, polypotassium methacrylate, a starch grafted polyacrylate, a starch grafted polymethacrylate, and carboxy methyl cellulose comprising combining an aqueous liquid with said polymer to form a hydrate in particulate form wherein the aqueous liquid comprises from 20% to 80% by weight of said hydrate.
Claim 26
Independent Claim
68 words
A method for immobilizing a cross-linked particulate water-insoluble, water-swellable absorbent polymer selected from the group consisting of a polysodium acrylate, a polysodium methacrylate, polypotassium acrylate, polypotassium methacrylate, a starch grafted polyacrylate, a starch grafted polymethacrylate, and carboxy methyl cellulose comprising combining an aqueous liquid with said polymer to form a hydrate in particulate form wherein the aqueous liquid comprises from 20% to 80% by weight of said hydrate.
Claim 27
Dependent Claim
19 words
The method of claim 22 wherein said aqueous liquid is selected from the group consisting of water and saline.
Claim 28
Dependent Claim
23 words
The method of claim 22 wherein said aqueous liquid comprises from 30% to 50% by weight of the total weight of said hydrate.
Claim 29
Dependent Claim
23 words
The method of claim 14 wherein said aqueous liquid comprises from 30% to 50% by weight of the total weight of said hydrate.
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| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
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