Patent US3726333A successfully refreshed from Google Patents.
US4331792A
Expired / Lapsed
US
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Continuous process for production of copolymer of an alkali metal vinyl sulfonate and acrylic acid
Assignee: ChampionX LLC
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Filing: 1980-05-27
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Granted: 1982-05-25
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Expires: 2000-05-27
Abstract
Abstract There is provided a continuous process for the production of a copolymer of an alkali metal vinyl sulfonate and acrylic acid. The process comprises continuously feeding an aqueous solution of an alkali metal vinyl sulfonate and acrylic acid together with a polymerization initiator to a reaction zone. The reaction zone is operated adiabatically at a temperature sufficiently high to affect copolymerization of the alkali metal vinyl sulfonate and acrylic acid. The alkali metal vinyl sulfonate and acrylic acid are maintained in the reaction zone for a residence time sufficient to form a copolymer of these two monomers. The resultant copolymer is continuously removed from the reaction zone.
Inventors
- 👤 Louis A. Goretta
- 👤 Robert R. Otremba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:29
CPC Classifications
C; C08; C08F; C08F228/00; C08F228/02; C08F220/00; C08F220/02; C08F220/04; C08F220/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
A continuous process for the production of a copolymer of an alkali metal vinyl sulfonate and acrylic acid which comprises continuously feeding an aqueous solution of an alkali metal vinyl sulfonate and acrylic acid together with a polymerization initiator to a reaction zone and copolymerizing said alkali metal vinyl sulfonate and acrylic acid, said reaction zone being maintained at a temperature sufficiently high to effect copolymerization of said alkali metal vinyl sulfonate and acrylic acid, the residence time of said alkali metal vinyl sulfonate and acrylic acid in said reaction zone being sufficient to form a copolymer thereof and being from about three to ten minutes, and continuously recovering said copolymer from said reaction zone.
Claim 2
Dependent Claim
115 words
A continuous process for the production of a copolymer of an alkali metal vinyl sulfonate and acrylic acid which comprises continuously feeding an aqueous solution of an alkali metal vinyl sulfonate and acrylic acid together with a polymerization initiator to a reaction zone and copolymerizing said alkali metal vinyl sulfonate and acrylic acid, said reaction zone being maintained at a temperature sufficiently high to effect copolymerization of said alkali metal vinyl sulfonate and acrylic acid, the residence time of said alkali metal vinyl sulfonate and acrylic acid in said reaction zone being sufficient to form a copolymer thereof and being from about three to ten minutes, and continuously recovering said copolymer from said reaction zone.
Claim 3
Dependent Claim
17 words
A process as defined in claim 1 wherein said alkali metal vinyl sulfonate is sodium vinyl sulfonate.
Claim 4
Dependent Claim
27 words
A process as defined in claim 2 wherein said sodium vinyl sulfonate and acrylic acid are mixed together with water before being fed to said reaction zone.
Claim 5
Dependent Claim
39 words
A process as defined in claim 3 wherein the pH of said solution of sodium vinyl sulfonate and acrylic acid is adjusted to within the range of from about 4.0 to 5.5 before being fed to said reaction zone.
Claim 6
Dependent Claim
15 words
A process as defined in claim 3 wherein said polymerization initiator is a redox catalyst.
Claim 7
Dependent Claim
17 words
A process as defined in claim 5 wherein said redox catalyst comprises ammonium persulfate and sodium bisulfite.
Claim 8
Dependent Claim
30 words
A process as defined in claim 6 wherein an aqueous solution of said ammonium persulfate and an aqueous solution of said sodium bisulfite are separately fed to said reaction zone.
Claim 9
Dependent Claim
27 words
A process as defined in claim 3 wherein said reaction zone is operated adiabatically at a temperature of from about 120° to 250° F. during said process.
Claim 10
Dependent Claim
27 words
A process as defined in claim 3 wherein said reaction zone is operated adiabatically at a temperature of from about 140° to 220° F. during said process.
Claim 11
Dependent Claim
30 words
A process as defined in claim 3 wherein the residence time of said sodium vinyl sulfonate and acrylic acid in said reaction zone is from about 5 to 7 minutes.
Claim 12
Dependent Claim
25 words
A process as defined in claim 3 wherein from about 0.01 to 0.5 mole of sodium vinyl sulfonate per mole of acrylic acid is employed.
Claim 13
Dependent Claim
25 words
A process as defined in claim 3 wherein from about 0.05 to 0.25 mole of sodium vinyl sulfonate per mole of acrylic acid is employed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |