Patent US3843585A successfully refreshed from Google Patents.
US3843585A
Expired / Lapsed
US
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Coacervation of anion-containing aqueous disperse systems with amphoteric polyelectrolytes
Assignee: Dow Chemical Co
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Filing: 1972-04-28
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Granted: 1974-10-22
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Expires: 1992-04-28
Abstract
Abstract Fluid, stable compositions containing aqueous disperse systems of anionizable material, e.g., a latex of an organic polymer having carboxylate functionality, and a water-dispersible amphoteric polyelectrolyte, e.g., a copolymer of 2-aminoethyl methacrylate and methacrylic acid, are coacervated by maintaining the pH of the composition at a value below the isoelectric point of the amphoteric polyelectrolyte and a value at which the disperse material contains anions.
Inventors
- 👤 D Kangas
- 👤 W Neuendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:20
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; B01J; B01J13/00; B01J13/0052; B01J13/0056; B01J13/006; B01J13/0065; C01; C01F; C01F11/00; C01F11/46; C02F1/54; C08; C08J; C08J3/00; C08J3/02; C08J3/03; D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/263; D06M15/267
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
157 words
A COMPOSITION COMPRISING AN AQUEOUS DISPERSE SYSTEM OF AN ANIONIZABLE MATERIAL SELECTED FROM THE GROUP CONSISTING OF ANIONICALLY-STABILIZED LATEX OF A WATER-INSOLUBLE ACIDIC POLYMER, LATEX OF WATER-INSOLUBLE POLYMER WHICH IS AT LEAST PARTIALLY STABILIZED BY ANIONIC SUFACTANT OR MIXTURE THEREOF WITH NON-IONIC SURFACTANT, LATEX OF WATER-INSOLUBLE POLYMER CONTAINING ANIONIZABLE GROUPS WHICH IS AT LEAST PARTIALLY STABILIZED BY NON-IONIC SURFACTANT AND AN AMOUNT OF AN INHERENTLY WATERDISPERSIBLE AMPHOTERIC POLYELECTROLYTE EFFECTIVE TO IRREVERSIBLY GEL THE SYSTEM AT A VALUE OF PH WHICH IS AT OR BELOW THE ISOELECTRIC POINT OF THE POLYELECTROLYTE AND AT WHICH VALUE THE ANIONIZABLE MATERIAL CONTAINS ANIONS, SAID POLYELECTROLYTE HAVING AN ISOELECTRIC POINT AT PH OF AT LEAST 6 AND CONTAINING IONIZABLE CATIONIC GROUPS HAVING A PKA IN THE RANGE FROM ABOUT 4 TO ABOUT 11 AND IONIZABLE ANIONIC GROUPS HAVING A PKA LESS THAN ABOUT 6, SAID POLYELECTROLYTE HAVING A MOLAR RATIO OF IONIZABLE CATIONIC GROUPS TO IONIZABLE ANIONIC GROUPS OF AT LEAST 1:1.
Claim 2
Dependent Claim
157 words
A COMPOSITION COMPRISING AN AQUEOUS DISPERSE SYSTEM OF AN ANIONIZABLE MATERIAL SELECTED FROM THE GROUP CONSISTING OF ANIONICALLY-STABILIZED LATEX OF A WATER-INSOLUBLE ACIDIC POLYMER, LATEX OF WATER-INSOLUBLE POLYMER WHICH IS AT LEAST PARTIALLY STABILIZED BY ANIONIC SUFACTANT OR MIXTURE THEREOF WITH NON-IONIC SURFACTANT, LATEX OF WATER-INSOLUBLE POLYMER CONTAINING ANIONIZABLE GROUPS WHICH IS AT LEAST PARTIALLY STABILIZED BY NON-IONIC SURFACTANT AND AN AMOUNT OF AN INHERENTLY WATERDISPERSIBLE AMPHOTERIC POLYELECTROLYTE EFFECTIVE TO IRREVERSIBLY GEL THE SYSTEM AT A VALUE OF PH WHICH IS AT OR BELOW THE ISOELECTRIC POINT OF THE POLYELECTROLYTE AND AT WHICH VALUE THE ANIONIZABLE MATERIAL CONTAINS ANIONS, SAID POLYELECTROLYTE HAVING AN ISOELECTRIC POINT AT PH OF AT LEAST 6 AND CONTAINING IONIZABLE CATIONIC GROUPS HAVING A PKA IN THE RANGE FROM ABOUT 4 TO ABOUT 11 AND IONIZABLE ANIONIC GROUPS HAVING A PKA LESS THAN ABOUT 6, SAID POLYELECTROLYTE HAVING A MOLAR RATIO OF IONIZABLE CATIONIC GROUPS TO IONIZABLE ANIONIC GROUPS OF AT LEAST 1:1.
Claim 3
Dependent Claim
24 words
The composition according to claim 1 wherein the polyelectrolyte has an isoelectric point at pH in the range from about 7 to about 10.
Claim 4
Dependent Claim
29 words
The composition according to claim 2 wherein the polyelectrolyte has a molar ratio of ionizable cationic groups to ionizable anionic groups in the range from about 2:1 to 10:1.
Claim 5
Dependent Claim
20 words
The composition according to claim 3 wherein the cationic groups are amino groups and the anionic groups are carboxyl groups.
Claim 6
Dependent Claim
32 words
The composition according to claim 4 wherein the polyelectrolyte is a copolymer of an aminoalkyl ester of Alpha , Beta -ethylenically unsaturated carboxylic acid and Alpha , Beta -ethylenically unsaturated carboxylic acid.
Claim 7
Dependent Claim
25 words
The composition according to claim 5 wherein the aqueous disperse system comprises an anionically stabilized latex of a normally solid, water-insoluble, plastic organic addition polymer.
Claim 8
Dependent Claim
31 words
The composition according to claim 6 wherein the addition polymer of the latex is a polymer of monovinylidene aromatic carbocyclic monomer, conjugated diene and Alpha , Beta -ethylenically unsaturated carboxylic acid.
Claim 9
Dependent Claim
126 words
A process for gelling an aqueous disperse system of an anionizable disperse material selected from the group consisting of anionically-stabilized latex of a water-insoluble acidic polymer, latex of water-insoluble polymer which is at least partially stabilized by anionic surfactant or mixture thereof with non-ionic surfactant, latex of water-insoluble polymer containing anionizable groups which is at least partially stabilized by non-ionic surfactant which comprises (1) combining the disperse system and the amphoteric polyelectrolyte of claim 1 in an amount effective to to irreversibly gel the disperse system at a value of pH which is at or below the isoelectric point of the polyelectrolyte and at which value the anionizable material contains anions and (2) maintaining the pH of the combined disperse system and polyelectrolyte at said value.
Claim 10
Dependent Claim
59 words
A process according to claim 8 for latent gelation of the aqueous disperse system wherein the disperse system and polyelectrolyte are combined at pH above the isoelectric point of the polyelectrolyte and the pH of the combined disperse system and polyelectrolyte is lowered to a pH below the isoelectric point of the polyelectrolyte without the addition of chemical agent.
Claim 11
Dependent Claim
15 words
The process according to claim 9 wherein the pH is lowered by volatilization of base.
Claim 12
Dependent Claim
12 words
The composition of claim 1 in the form of an irreversible gel.
Claim 13
Dependent Claim
8 words
The composition of claim 11 which is foamed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |