US3714067A
Expired / Lapsed
US
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Methods of inhibiting corrosion with condensed polyalkylenepolyamine phosphonates
Assignee: Monsanto Co
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Filing: 1971-07-07
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Granted: 1973-01-30
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Expires: 1991-07-07
Abstract
Abstract Condensed polyalkylenepolyamine derivatives having the formula WHEREIN R1, R2, R3, R4, R5, X and Y are hereinafter defined, n is 1 - 15 and m is 1 - 20, alone or in combination with zinc, dichromate, certain thiols and 1,2,3-triazoles and mixtures thereof, are disclosed as inhibiting the corrosion of metals by oxygen-bearing waters.
Inventors
- 👤 T King
- 👤 R Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:30
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
165 words
A composition useful for inhibiting the corrosion of metals in a water system consisting essentially of from about 2 percent to about 80 percent by weight of a water soluble zinc salt and from about 20 percent to 98 percent by weight of a polyamine having the general formula wherein (a) R1, R2, R4 and R5 are alike or unlike and are each selected from the group consisting of wherein M is either hydrogen or any cation which will provide sufficient solubility in said aqueous system; (b) R3 is an alkyl group containing from about one to eight carbon atoms; (c) X and Y are each alike or unlike and are selected from the group consisting of hydrogen and alkyl; (d) n has a value of from 1 through 15 and (e) m has a value of from 1 through 20; with the proviso that said polyamine has at least two -C(X)(Y)PO3Mgroups at all times and are either R1 and R2 or R4 and R5.
Claim 2
Dependent Claim
165 words
A composition useful for inhibiting the corrosion of metals in a water system consisting essentially of from about 2 percent to about 80 percent by weight of a water soluble zinc salt and from about 20 percent to 98 percent by weight of a polyamine having the general formula wherein (a) R1, R2, R4 and R5 are alike or unlike and are each selected from the group consisting of wherein M is either hydrogen or any cation which will provide sufficient solubility in said aqueous system; (b) R3 is an alkyl group containing from about one to eight carbon atoms; (c) X and Y are each alike or unlike and are selected from the group consisting of hydrogen and alkyl; (d) n has a value of from 1 through 15 and (e) m has a value of from 1 through 20; with the proviso that said polyamine has at least two -C(X)(Y)PO3Mgroups at all times and are either R1 and R2 or R4 and R5.
Claim 3
Dependent Claim
15 words
The composition as set forth in claim 1 wherein X and Y both are hydrogen.
Claim 4
Dependent Claim
18 words
The composition as set forth in claim 2 wherein R1, R2, R4 and R5 are each -CH2PO3M2 groups.
Claim 5
Dependent Claim
26 words
The composition as set forth in claim 2 wherein M is a cation selected from the group consisting of alkali metals, ammonia, zinc, and mixtures thereof.
Claim 6
Dependent Claim
21 words
The composition as set forth in claim 4 wherein the water soluble zinc salt is zinc sulfate and M is sodium.
Claim 7
Dependent Claim
17 words
The composition as set forth in claim 1 and additionally containing a water-soluble hexavalent compound of chromium.
Claim 8
Dependent Claim
204 words
A composition useful for inhibiting the corrosion of metals in a water system which contains cuprous metals consisting essentially of (1) from about 20 percent to about 90 percent by weight of a polyamine having the general formula wherein (a) R1, R2, R4 and R5 are alike or unlike and are each selected from the group consisting of wherein M is either hydrogen or any cation which will provide sufficient solubility in said aqueous system; (b) R3 is an alkyl group containing from about one to eight carbon atoms; (c) X and Y are each alike or unlike and are selected from the group consisting of hydrogen and alkyl; (d) n has a value of from 1 through 15 and (e) m has a value of from 1 through 20; with the proviso that said polyamine polyphosphonate has at least two -C(X)(Y)PO3M2 groups at all times and are either R1 and R2 or R4 and R5; (2) from about 1 percent to about 10 percent by weight of a compound selected from the group consisting of 1,2,3-triazoles, thiols of thiazoles, thiols of oxazoles, thiols of imidazoles, and mixtures thereof, and (3) up to about 79 percent by weight of a water soluble zinc salt.
Claim 9
Dependent Claim
204 words
A composition useful for inhibiting the corrosion of metals in a water system which contains cuprous metals consisting essentially of (1) from about 20 percent to about 90 percent by weight of a polyamine having the general formula wherein (a) R1, R2, R4 and R5 are alike or unlike and are each selected from the group consisting of wherein M is either hydrogen or any cation which will provide sufficient solubility in said aqueous system; (b) R3 is an alkyl group containing from about one to eight carbon atoms; (c) X and Y are each alike or unlike and are selected from the group consisting of hydrogen and alkyl; (d) n has a value of from 1 through 15 and (e) m has a value of from 1 through 20; with the proviso that said polyamine polyphosphonate has at least two -C(X)(Y)PO3M2 groups at all times and are either R1 and R2 or R4 and R5; (2) from about 1 percent to about 10 percent by weight of a compound selected from the group consisting of 1,2,3-triazoles, thiols of thiazoles, thiols of oxazoles, thiols of imidazoles, and mixtures thereof, and (3) up to about 79 percent by weight of a water soluble zinc salt.
Claim 10
Dependent Claim
18 words
The composition as set forth in claim 7 wherein said polyamine is selected from the group consisting of
Claim 11
Dependent Claim
17 words
The composition as set forth in claim 7 and additionally containing a water-soluble hexavalent compound of chromium.
Claim 12
Independent Claim
148 words
A method of inhibiting the corrosion of metals in a water system comprising maintaining in the water of said system at least 3 parts per million of a polyamine having the general formuLa wherein (a) R1, R2, R4 and R5 are alike or unlike and are each selected from the group consisting of wherein M is either hydrogen or any cation which will provide sufficient solubility in said aqueous system; (b) R3 is an alkyl group containing from about one to eight carbon atoms; (c) X and Y are each alike or unlike and are selected from the group consisting of hydrogen and alkyl; (d)n has a value of from 1 through 15 and (e) m has a value of from 1 through 20; with the proviso that said polyamine has at least two -C(X)(Y)PO3M2 groups at all times and are eitherR1 and R2 or R4 and R5.
Claim 13
Independent Claim
148 words
A method of inhibiting the corrosion of metals in a water system comprising maintaining in the water of said system at least 3 parts per million of a polyamine having the general formuLa wherein (a) R1, R2, R4 and R5 are alike or unlike and are each selected from the group consisting of wherein M is either hydrogen or any cation which will provide sufficient solubility in said aqueous system; (b) R3 is an alkyl group containing from about one to eight carbon atoms; (c) X and Y are each alike or unlike and are selected from the group consisting of hydrogen and alkyl; (d)n has a value of from 1 through 15 and (e) m has a value of from 1 through 20; with the proviso that said polyamine has at least two -C(X)(Y)PO3M2 groups at all times and are eitherR1 and R2 or R4 and R5.
Claim 14
Dependent Claim
15 words
The composition as set forth in claim 10 wherein X and Y both are hydrogen.
Claim 15
Dependent Claim
18 words
The composition as set forth in claim 11 wherein R1, R2, R4, and R5 are each -CH2PO3M2 groups.
Claim 16
Dependent Claim
26 words
The composition as set forth in claim 11 wherein M is a cation selected from the group consisting of alkali metals, ammonia, zinc, and mixtures thereof.
Claim 17
Dependent Claim
21 words
The method as set forth in claim 10 and additionally containing in said system a water soluble hexavalent compound of chromium.
Claim 18
Dependent Claim
19 words
The method as set forth in claim 10 and additionally containing in said system a water soluble zinc salt.
Claim 19
Dependent Claim
27 words
The method as set forth in claim 15 and additionally containing in said system a water soluble hexavalent compound of chromium and a water soluble zinc salt.
Claim 20
Dependent Claim
41 words
The method as set forth in claim 10 wherein said system contains cuprous metals and the water system additionally contains a compound selected from the group consisting of 1,2,3-triazoles, thiols of thiazoles, thiols of oxazoles, thiols of imidazoles, and mixtures thereof.
Claim 21
Dependent Claim
19 words
The method as set forth in claim 17 wherein the water system additionally contains a water soluble zinc salt.
Claim 22
Independent Claim
57 words
A method of inhibiting metal corrosion in a water system containing metals comprising maintaining in the water of said system (a) from about 3 to about 100 ppm of methylimino bis-(propyl amino) tetra(methylene phosphonic acid), (H2O3PH2C)2N(CH2)3N(CH3) (CH2)3N(CH2PO3H2)2, or its water soluble salts and (b) up to about 100 ppm zinc ion derived from water soluble zinc salts.
Claim 23
Independent Claim
57 words
A method of inhibiting metal corrosion in a water system containing metals comprising maintaining in the water of said system (a) from about 3 to about 100 ppm of methylimino bis-(propyl amino) tetra(methylene phosphonic acid), (H2O3PH2C)2N(CH2)3N(CH3) (CH2)3N(CH2PO3H2)2, or its water soluble salts and (b) up to about 100 ppm zinc ion derived from water soluble zinc salts.
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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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |