Patent US3086904A successfully refreshed from Google Patents.
US4070321A
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Process for the preparation of water-in-oil emulsions of water soluble vinyl carboxylic acid polymers and copolymers
Assignee: ChampionX LLC
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Filing: 1976-12-02
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Granted: 1978-01-24
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Expires: 1996-12-02
Abstract
Abstract Water-in-oil emulsions of water soluble vinyl carboxylic acid polymers and copolymers are prepared by:
Inventors
- 👤 Louis A. Goretta
- 👤 Frederick J. Sibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:01
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
In an improved method for the preparation of water-in-oil emulsions of high molecular weight water soluble vinyl carboxylic acid polymers, said method comprising: A. forming an emulsion comprising: 1. 30-95% by weight of an aqueous phase consisting of water and a water soluble vinyl addition monomer said water soluble vinyl addition monomer containing from 1.0-70.0% by weight of a water soluble vinyl carboxylic acid monomer based on the weight of the monomer; 2. 5.0-70.0% by weight of a hydrophilic oil; 3. 0.1-21.0% by weight of a water-in-oil emulsifying agent; B. polymerizing said emulsion under free radical forming conditions; and then, C. recovering a water-in-oil emulsion of a high molecular weight water soluble vinyl carboxylic acid polymer; the improvement comprising adjusting the pH of the aqueous phase to between 4.5-8.0 prior to polymerization.
Claim 2
Dependent Claim
132 words
In an improved method for the preparation of water-in-oil emulsions of high molecular weight water soluble vinyl carboxylic acid polymers, said method comprising: A. forming an emulsion comprising: 1. 30-95% by weight of an aqueous phase consisting of water and a water soluble vinyl addition monomer said water soluble vinyl addition monomer containing from 1.0-70.0% by weight of a water soluble vinyl carboxylic acid monomer based on the weight of the monomer; 2. 5.0-70.0% by weight of a hydrophilic oil; 3. 0.1-21.0% by weight of a water-in-oil emulsifying agent; B. polymerizing said emulsion under free radical forming conditions; and then, C. recovering a water-in-oil emulsion of a high molecular weight water soluble vinyl carboxylic acid polymer; the improvement comprising adjusting the pH of the aqueous phase to between 4.5-8.0 prior to polymerization.
Claim 3
Dependent Claim
22 words
The improvement of claim 1 wherein the vinyl carboxylic acid is selected from the group consisting of acrylic acid and methacrylic acid.
Claim 4
Dependent Claim
15 words
The improvement of claim 1 wherein the vinyl carboxylic polymer contains acrylamide as a comonomer.
Claim 5
Dependent Claim
13 words
The improvement of claim 1 wherein the pH is adjusted to from 5.0-7.0.
Claim 6
Dependent Claim
19 words
The improvement of claim 1 wherein the pH of the aqueous phase is adjusted with an alkali metal hydroxide.
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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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |