Patent US3898037A successfully refreshed from Google Patents.
US3898037A
Expired / Lapsed
US
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Acrylamido-sulfonic acid polymers and their use
Assignee: Veolia WTS USA Inc
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Filing: 1973-10-24
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Granted: 1975-08-05
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Expires: 1993-10-24
Abstract
Abstract The present disclosure is directed to polymers and copolymers of acrylamido-sulfonic acid compounds and their use basically as dispersants for particles contained in aqueous systems. Exemplary of the sulfonic acid compound is 2-acrylamido-2-methylpropane sulfonic acid, or water-soluble salt thereof; and representative of the co-monomers which the acid is copolymerized with can be mentioned, acrylic acid and derivatives thereof, acrylamide and derivatives thereof, vinyl pyrrolidone, etc. The polymers and copolymers are specifically useful in dispersing water-insoluble compounds of iron, calcium, magnesium and aluminum and such commonly occurring particles of slit and clay.
Inventors
- 👤 K Robert Lange
- 👤 Robert H Schiesser
- 👤 Richard G Tonkyn
- 👤 Russell T Dean
- 👤 Executrix By S Martha Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:50
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
A METHOD OF INHIBITING THE CORROSION OF A METAL SURFACE IN CONTACT WITH AN AQUEOUS SOLUTION WHICH COMPRISES ADDING TO SAID SOLUTION FROM ABOUT 0.1 TOO ABOUT 100 PARTS PER MILLION PARTS OF SAID SOLUTION OF A WATER-SOLUBLE POLYMER OF A SULFONIC ACID COMPOUND HAVING THE FORMULA:
Claim 2
Independent Claim
47 words
A METHOD OF INHIBITING THE CORROSION OF A METAL SURFACE IN CONTACT WITH AN AQUEOUS SOLUTION WHICH COMPRISES ADDING TO SAID SOLUTION FROM ABOUT 0.1 TOO ABOUT 100 PARTS PER MILLION PARTS OF SAID SOLUTION OF A WATER-SOLUBLE POLYMER OF A SULFONIC ACID COMPOUND HAVING THE FORMULA:
Claim 3
Dependent Claim
141 words
A method according to claim 1 wherein the polymer is a copolymer of said sulfonic acid compound and at least one other vinylic monomer selected from the group consisting of acrylic acid, the alkali metal and ammonium salts of acrylic acid, esters of acrylic acid, methacrylic acid, the alkali metal and ammonium salts of methacrylic acid, esters of methacrylic acid, acrylamide, the alkyl substituted acrylamides, the N-alkanol substituted acrylamides, vinyl pyrrolidone, maleic acid or anhydride, the alkali metal and ammonium salts of maleic acid, itaconic acid, the alkali metal and ammonium salts of itaconic acid, esters of maleic acid, esters of itaconic acid, said polymer has a molecular weight of from about 1,000 to 100,000 and contains from about 20 to about 80% by weight of said sulfonic acid compound and from about 80 to about 20% of said vinylic monomer.
Claim 4
Dependent Claim
20 words
A method according to claim 2 wherein the sulfonic acid compound is 2-acrylamido-2-methylpropane sulfonic acid or a water-soluble salt thereof.
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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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |