US4043952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment process for improving dispersibility of an absorbent composition, and product thereof
Assignee: Ingredion Inc
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Filing: 1975-05-09
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Granted: 1977-08-23
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Expires: 1995-05-09
Abstract
Abstract The aqueous dispersibility of a water-absorbent composition of matter is improved by a surface treatment which ionically complexes the surface thereof to a moderate degree. A dispersion is formed comprising a water-absorbent composition of matter based on an anionic poly-electrolyte, at least one polyvalent metal cation, and a dispersing medium in which the composition of matter is substantially insoluble. The dispersion is maintained within a given temperature range for a period of time sufficient to ionically complex the exposed surface of the composition of matter, and the dispersing medium is then removed. The product is characterized by a linkage density which is greater at the surface thereof than in the interior thereof and by the presence of ionic linkages at the surface thereof.
Inventors
- 👤 Stuart H. Ganslaw
- 👤 Howard G. Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/8141; A61K8/8147; A61K8/8158; A61Q; A61Q1/00; A61Q1/12; A61Q15/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
102 words
A process for surface treating a water-absorbent composition of matter to improve its aqueous dispersibility comprising the steps of A. forming a dispersion comprising (i) a water-absorbent composition of matter based on an anionic poly-electrolyte, (ii) polyvalent, cations of at least one metal, and (iii) a dispersing medium in which said composition of matter is substantially insoluble; B. maintaining said dispersion at a temperature of about -40° to about +150° C for a period of time sufficient for said cations to ionically complex the outer surface of said composition of matter exposed to said dispersing medium; and C. removing said dispersing medium.
Claim 2
Dependent Claim
102 words
A process for surface treating a water-absorbent composition of matter to improve its aqueous dispersibility comprising the steps of A. forming a dispersion comprising (i) a water-absorbent composition of matter based on an anionic poly-electrolyte, (ii) polyvalent, cations of at least one metal, and (iii) a dispersing medium in which said composition of matter is substantially insoluble; B. maintaining said dispersion at a temperature of about -40° to about +150° C for a period of time sufficient for said cations to ionically complex the outer surface of said composition of matter exposed to said dispersing medium; and C. removing said dispersing medium.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein said cations are selected from the group consisting of ions of the metals of Groups IIA-VIA, IB-VIIB, and VIII.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein about 0.05-10.0 milliequivalents of said cations are present in said dispersion per gram of said composition of matter on a dry basis.
Claim 5
Dependent Claim
28 words
The process of claim 3 wherein about 0.1-2.0 milliequivalents of said cations are present in said dispersion per gram of said composition of matter on a dry basis.
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein said dispersing medium is selected from the group consisting of aliphatic and aromatic esters, ketones, alkyl ethers, alkanes containing 5-18 carbon atoms, aromatics, and blends of water-miscible solvents with water.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein said dispersion is maintained at said temperature for at least a minute.
Claim 8
Dependent Claim
24 words
The process of claim 6 wherein said dispersion is maintained at a temperature of about 25° C to 110° C for about 5-60 minutes.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein said cations are introduced as a metal compound ionizable in said dispersing medium.
Claim 10
Dependent Claim
32 words
The process of claim 1 wherein said composition of matter comprises a water-swellable, water-insoluble ionic complex of a water-soluble anionic poly-electrolyte and polyvalent metal cations having a valence of at least three.
Claim 11
Dependent Claim
17 words
The process claim 1 wherein said composition of matter comprises a water-swellable, water-insoluble covalently crosslinked anionic poly-electrolyte.
Claim 12
Dependent Claim
15 words
The process of claim 1 wherein said composition of matter comprises a water-insoluble anionic poly-electrolyte.
Claim 13
Dependent Claim
31 words
The process of claim 1 wherein about 0.5-100 parts of said dispersing medium are present in said dispersion per part by weight of said composition of matter on a dry basis.
Claim 14
Dependent Claim
31 words
The process of claim 12 wherein about 2-10 parts of said dispersion medium are present in said dispersion per part by weight of said composition of matter on a dry basis.
Claim 15
Dependent Claim
56 words
A water-absorbent composition of matter comprising water-dispersible water-absorbent particles based on an anionic poly-electrolyte, each of said particles having a linkage density at the particle surface greater than the linkage density in the particle interior, the linkages at the particle surface comprising at least in part ionic complexing of said anionic poly-electrolyte by polyvalent metal cations.
Claim 16
Dependent Claim
56 words
A water-absorbent composition of matter comprising water-dispersible water-absorbent particles based on an anionic poly-electrolyte, each of said particles having a linkage density at the particle surface greater than the linkage density in the particle interior, the linkages at the particle surface comprising at least in part ionic complexing of said anionic poly-electrolyte by polyvalent metal cations.
Claim 17
Dependent Claim
27 words
The composition of matter of claim 14 wherein said cations are selected from the group consisting of ions of the metals of Groups IIA-VIA, IB-VIIB, and VIII.
Claim 18
Dependent Claim
28 words
The composition of matter of claim 14 wherein said particles comprise about 0.05-10.0 milliequivalents of said cations per gram of said composition of matter on a dry basis.
Claim 19
Dependent Claim
34 words
The composition of matter of claim 14 wherein said particle interior comprises a water-swellable, water-insoluble ionic complex of a water-soluble anionic poly-electrolyte and a polyvalent metal cation having a valence of at least three.
Claim 20
Dependent Claim
19 words
The composition of matter of claim 14 wherein said particle interior comprises a water-swellable, water-insoluble covalently crosslinked anionic poly-electrolyte.
Claim 21
Dependent Claim
16 words
The composition of matter of claim 14 wherein said particle interior comprises a water-soluble anionic poly-electrolyte.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |