Patent US3996180A successfully refreshed from Google Patents.
US3996180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High shear mixing of latex polymers
Assignee: ChampionX LLC
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Filing: 1975-04-23
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Granted: 1976-12-07
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Expires: 1995-04-23
Abstract
Abstract Water-in-oil emulsions of water soluble vinyl addition polymers of the type comprising from: A. 30 to 95% by weight of the emulsion of an aqueous phase comprising water and monomer; B. 10 to 50% by weight of the emulsion of a water soluble vinyl addition polymer; C. 5 to 70% by weight of the emulsion of a hydrophobic liquid; D. and 0.1 to 21% by weight of the emulsion of a water-in-oil emulsifying agent; Can be rendered more stable to prolong storage by subjecting the emulsion to high shear mixing prior to polymerization.
Inventors
- 👤 James Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:02
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
217 words
An improvement in a method for producing a polymeric latex of the type comprising a water-in-oil emulsion which contains dispersed therein a finely divided water soluble vinyl addition polymer, said polymeric latex being produced by the known steps of: A. forming a water-in-oil emulsion from: 1. water which contains therein a water soluble ethylenically unsaturated monomer, thereby producing a monomer phase which has a concentration of from 30 - 95% by weight of the emulsion; 2. a hydrophobic liquid in a concentration of from 5 - 70% by weight of the emulsion; 3. a water-in-oil emulsifying agent in a concentration of from 0.1 - 21.0% by weight of the emulsion; 4. a free radical initiator; B. subjecting said emulsion to free radical forming conditions so as to polymerize the water soluble ethylenically unsaturated monomer contained in the emulsion; and then, C. recovering the water-in-oil emulsion of the water soluble vinyl addition polymer; the improvement which comprises subjecting the water-in-oil emulsion of the water soluble ethylenically unsaturated monomer to high shear mixing prior to polymerization said shear not being so great as to break the emulsion or to cause the emulsion to set up in a paste or gell-like consistency, whereby the water-in-oil emulsion of the water soluble vinyl addition polymer of Step C has improved storage stability.
Claim 2
Dependent Claim
217 words
An improvement in a method for producing a polymeric latex of the type comprising a water-in-oil emulsion which contains dispersed therein a finely divided water soluble vinyl addition polymer, said polymeric latex being produced by the known steps of: A. forming a water-in-oil emulsion from: 1. water which contains therein a water soluble ethylenically unsaturated monomer, thereby producing a monomer phase which has a concentration of from 30 - 95% by weight of the emulsion; 2. a hydrophobic liquid in a concentration of from 5 - 70% by weight of the emulsion; 3. a water-in-oil emulsifying agent in a concentration of from 0.1 - 21.0% by weight of the emulsion; 4. a free radical initiator; B. subjecting said emulsion to free radical forming conditions so as to polymerize the water soluble ethylenically unsaturated monomer contained in the emulsion; and then, C. recovering the water-in-oil emulsion of the water soluble vinyl addition polymer; the improvement which comprises subjecting the water-in-oil emulsion of the water soluble ethylenically unsaturated monomer to high shear mixing prior to polymerization said shear not being so great as to break the emulsion or to cause the emulsion to set up in a paste or gell-like consistency, whereby the water-in-oil emulsion of the water soluble vinyl addition polymer of Step C has improved storage stability.
Claim 3
Dependent Claim
27 words
The improvement of claim 1 wherein the water-in-oil emulsion of the water soluble vinyl addition polymer has an average particle size of from 0.1 to 3.0 microns.
Claim 4
Dependent Claim
14 words
The improvement of claim 1 wherein the water soluble ethylenically unsaturated monomer is acrylamide.
Claim 5
Dependent Claim
24 words
The improvement of claim 1 wherein the high shear mixing of the water-in-oil emulsion is performed prior to the addition of free radical iniator.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |