US4446046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly (alkenyl) phosphonic acid and methods of use thereof
Assignee: Veolia WTS USA Inc
•
Filing: 1982-12-20
•
Granted: 1984-05-01
•
Expires: 2002-12-20
Abstract
Abstract A polymer composition having a repeat unit characterized by the formula ##STR1## wherein R 1 =an alkyl group having one to six carbon atoms; X=OH or OM, M=a cation; is disclosed. The composition is effective in inhibiting the precipitation of certain scale forming salts, and also acts to inhibit corrosion in water systems.
Inventors
- 👤 Larry W. Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:17
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173; C23F14/00; C23F14/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
Method of inhibiting corrosion of and deposit formation along metallic parts in contact with a boiler water system comprising adding to said system an effective amount of a water soluble polymer (I) having a repeat unit represented by the formula ##STR10## wherein R 1 is a lower alkyl group of one to about six carbon atoms, and wherein X=OH or OM, where M is a cation.
Claim 2
Dependent Claim
66 words
Method of inhibiting corrosion of and deposit formation along metallic parts in contact with a boiler water system comprising adding to said system an effective amount of a water soluble polymer (I) having a repeat unit represented by the formula ##STR10## wherein R 1 is a lower alkyl group of one to about six carbon atoms, and wherein X=OH or OM, where M is a cation.
Claim 3
Dependent Claim
33 words
Method as defined in claim 1 wherein said polymer (I) is added to said aqueous medium in an amount of about 0.1-500 parts polymer I per one million parts of said aqueous medium.
Claim 4
Dependent Claim
65 words
Method as defined in claim 1 further comprising adding to said system, an effective amount for the purpose, of a compound (II) selected from the group consisting of inorganic phosphoric acids and water soluble salts thereof, phosphonic acids and water soluble thereof, organic phosphoric acid esters and water soluble salts thereof, and polyvalent metal salts capable of being dissociated to polyvalent metal ions in water.
Claim 5
Dependent Claim
42 words
Method as defined in claim 3 wherein said inorganic phosphoric acid (II) is a member selected from the group consisting of orthophosphoric acid, primary phosphoric acid, secondary phosphoric acid, pyrophosphoric acid, tripolyphosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid and water soluble salts thereof.
Claim 6
Dependent Claim
35 words
Method as defined in claim 3 wherein said phosphonic acid (II) is a member selected from the group consisting of ethylene diamine tetramethylene phosphonic acid, methylene diphosphonic acid, hydroxyethylidene diphosphonic acid and 2-phosphono-butane 1,2,4-tricarboxylic acid.
Claim 7
Dependent Claim
29 words
Method as defined in claim 3 wherein said polyvalent metal salt is a member selected from the group consisting of zinc chloride, nickel chloride, zinc sulfate and nickel sulfate.
Claim 8
Dependent Claim
30 words
Method as defined in claim 3 wherein said compound (II) is added to said system in an amount of 20 to about 500 parts per million parts of said system.
Claim 9
Dependent Claim
12 words
Method as defined in claim 1 wherein R 1 =CH 3 .
Claim 10
Dependent Claim
14 words
Method as defined in claim 1 wherein R 1 =C 6 H 13 .
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |