EP0149998A2
Expired / Lapsed
EP
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Delayed-swelling absorbent systems
Assignee: Kimberly Clark Corp
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Filing: 1985-01-04
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Granted: —
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Expires: 2005-01-04
Abstract
Abstract The invention comprises of an anionic polyelectrolyte hydrogel reversibly cross-linked with a polyvalent metal cation having a valence of at least two. This hydrogel may be combined with a removal agent for imparting delayed. swelling characteristics when contacted with a water-containing fluid. The delayed swelling allows the water-containing fluid to penetrate or permeate the system before swelling is initiated, thereby providing enhanced wetting prior to the onset of swelling and alleviating gel blockage.
Inventors
- 👤 Gerard M. Aberson
- 👤 Gerard J.F. Ring
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 13:27
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61F13/20; A61F13/2002; A61F13/202; A61F13/534; A61F13/53409; A61F2013/15008; A61F2013/15048; A61F2013/15073; A61F2013/530481; A61F2013/530708; A61F2013/530715; A61F2013/530722; A61F2013/53445; A61F13/84; A61F2013/8488; Y; Y10; Y10S; Y10S34/00; Y10S34/01; Y10S428/00; Y10S428/913; Y10S524/00; Y10S524/916; Y10T; Y10T428/00; Y10T428/23; Y10T428/237; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T442/00; Y10T442/20; Y10T442/2484; Y10T442/60; Y10T442/659
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
39 words
'A water-swellable, water-absorbent system comprising an anionic polyelectrolyte reversibly cross-linked with a polyvalent metal cation having a valence of at least two and a cation removal agent, said composition having delayed swelling characteristics when contacted with a water-containing fluid.
Claim 2
Dependent Claim
39 words
'A water-swellable, water-absorbent system comprising an anionic polyelectrolyte reversibly cross-linked with a polyvalent metal cation having a valence of at least two and a cation removal agent, said composition having delayed swelling characteristics when contacted with a water-containing fluid.
Claim 3
Dependent Claim
13 words
The system of Claim 1 wherein said cation removal agent comprises a ligand.
Claim 4
Dependent Claim
32 words
The system of Claim 1 wherein said cation removal agent is selected from the group consisting essentially of sodium phosphate dibasic, the disodium salt of ethylenediamine-tetraacetic acid, sodium hexametophosphate and mixtures thereof.
Claim 5
Dependent Claim
21 words
The system of Claim 1 wherein said anionic polyelectrolyte is partially cross-linked by another means in addition to said metal cation.
Claim 6
Dependent Claim
19 words
A method for the absorption of a water-containing fluid comprising contacting said fluid with the system of Claim 1.
Claim 7
Dependent Claim
49 words
An article of manufacture comprising an open support structure containing a water-swellable, water-absorbent system comprising an anionic polyelectrolyte reversibly cross-linked with a polyvalent metal cation having a valance of at least two and a cation removal agent, said composition having delayed swelling characteristics when contacted with a water-containing fluid.
Claim 8
Dependent Claim
49 words
An article of manufacture comprising an open support structure containing a water-swellable, water-absorbent system comprising an anionic polyelectrolyte reversibly cross-linked with a polyvalent metal cation having a valance of at least two and a cation removal agent, said composition having delayed swelling characteristics when contacted with a water-containing fluid.
Claim 9
Dependent Claim
13 words
The article of Claim 6 wherein said cation removal agent comprises a ligand.
Claim 10
Dependent Claim
33 words
The article of Claim 6 wherein said cation removal agent is selected from the group consisting essentially of sodium phosphate dibasic, the disodium salt of ethylenediamine- tetraacitic acid, sodium hexametophosphate and mixtures thereof.
Claim 11
Dependent Claim
21 words
The article of Claim 6 wherein said anionic polyelectrolyte is partially cross-linked by another means in addition to said metal cation.
Claim 12
Dependent Claim
14 words
The article of Claim 6 wherein said open support structure is a fibrous mat.
Claim 13
Independent Claim
59 words
A method for preparing an anionic polyelectrolyte reversibly cross-linked with a polyvalent metal cation to an extent that the superabsorbency characteristics of said polyelectrolyte have been substantially reduced comprising providing an incompletely cross-linked anionic polyelectrolyte, contacting said polyelectrolyte with an aqueous solution of a salt of a polyvalent metal cation and removing water to recover the removably cross-linked material.
Claim 14
Independent Claim
59 words
A method for preparing an anionic polyelectrolyte reversibly cross-linked with a polyvalent metal cation to an extent that the superabsorbency characteristics of said polyelectrolyte have been substantially reduced comprising providing an incompletely cross-linked anionic polyelectrolyte, contacting said polyelectrolyte with an aqueous solution of a salt of a polyvalent metal cation and removing water to recover the removably cross-linked material.
Claim 15
Dependent Claim
25 words
The method of Claim 11 wherein said anionic poly- electrode is partially cross-linked by another means prior to reversible cross-linking with said metal cation. :
Claim 16
Dependent Claim
14 words
The method of Claim 11 wherein said cation comprises . magnesium,-barium, or combinations thereof.
Claim 17
Dependent Claim
10 words
The method of Claim 11 wherein said cation comprises calcium.
Claim 18
Dependent Claim
22 words
-A water-absorbing material comprising an anionic polyelectrolyte reversibly' cross-linked with a polyvalent metal cation having a valence of at least two (2).
Claim 19
Dependent Claim
22 words
-A water-absorbing material comprising an anionic polyelectrolyte reversibly' cross-linked with a polyvalent metal cation having a valence of at least two (2).
Claim 20
Dependent Claim
24 words
The material of Claim 1.5 wherein said anionic polyelectrolyte is partially cross-linked by another means in addition to the cross-linking of said metal cation.
Claim 21
Dependent Claim
13 words
The material Claim 15 wherein said cation comprises magnesium, barium, or combinations thereof.
Claim 22
Dependent Claim
10 words
The method of Claim 15 wherein said cation comprises calcium.
References Cited (Backward Citations)
No citation records indexed.
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