US4021399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the concentration of water-in-oil emulsions of water soluble vinyl addition polymers
Assignee: ChampionX LLC
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Filing: 1976-03-12
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Granted: 1977-05-03
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Expires: 1996-03-12
Abstract
Abstract A method for the concentration of water-in-oil emulsions of water soluble vinyl addition polymers is disclosed. The process involves distilling the water-in-oil emulsion of the water soluble vinyl addition polymer under a vacuum while maintaining the water-oil phase ratio substantially equal to the starting latex. Maintaining this ratio allows latices of this type to be concentrated to as high as 70% by weight polymer.
Inventors
- 👤 Wood E. Hunter
- 👤 Barney Vallino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:17
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/14; C08F6/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
186 words
A process for the concentration of water-in-oil emulsions of water-soluble vinyl addition polymers which comprises the steps of: A. heating a water-in-oil emulsion of a water-soluble vinyl addition polymer to a temperature of from 40° 90° C. with agitation while maintaining a vacuum, said water-in-oil emulsion of a water-soluble vinyl addition polymer comprising: 1. From 30 - 95% by weight of an aqueous phase consisting of polymer and water; 2. From 10 - 40% by weight polymer; 3. From 5 - 70% by weight of an inert hydrophobic liquid; and, 4. From 0.1 - 21.0% by weight of a water-in-oil emulsifying agent; B. removing by distillation from the water-in-oil emulsion a mixture of water and inert hydrophobic liquid; C. maintaining the weight phase ratio of water and inert hydrophobic liquid present in the water-in-oil emulsion at substantially an equal level by returning to the water-in-oil emulsion excess water or hydrophobic liquid distilled; D. continuing steps A, B and C above until the water-in-oil emulsion contains from 40 - 60% by weight polymer; and then, E. recovering a concentrated water-in-oil emulsion of a water-soluble vinyl addition polymer.
Claim 2
Dependent Claim
186 words
A process for the concentration of water-in-oil emulsions of water-soluble vinyl addition polymers which comprises the steps of: A. heating a water-in-oil emulsion of a water-soluble vinyl addition polymer to a temperature of from 40° 90° C. with agitation while maintaining a vacuum, said water-in-oil emulsion of a water-soluble vinyl addition polymer comprising: 1. From 30 - 95% by weight of an aqueous phase consisting of polymer and water; 2. From 10 - 40% by weight polymer; 3. From 5 - 70% by weight of an inert hydrophobic liquid; and, 4. From 0.1 - 21.0% by weight of a water-in-oil emulsifying agent; B. removing by distillation from the water-in-oil emulsion a mixture of water and inert hydrophobic liquid; C. maintaining the weight phase ratio of water and inert hydrophobic liquid present in the water-in-oil emulsion at substantially an equal level by returning to the water-in-oil emulsion excess water or hydrophobic liquid distilled; D. continuing steps A, B and C above until the water-in-oil emulsion contains from 40 - 60% by weight polymer; and then, E. recovering a concentrated water-in-oil emulsion of a water-soluble vinyl addition polymer.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the oil/water phase ratio of the concentrated water-in-oil emulsion of a water-soluble vinyl addition polymer is -0.1 to +0.6 units from the oil/water ratio of the starting water-in-oil emulsion.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the water-soluble vinyl addition polymer is an acrylamide polymer.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the distillation is conducted at a reduced pressure.
References Cited (Backward Citations)
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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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |