US4299725A
Expired / Lapsed
US
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Aqueous media of decreased corrosiveness for iron-containing metals
Assignee: Henkel AG and Co KGaA
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Filing: 1978-03-10
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Granted: 1981-11-10
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Expires: 1998-03-10
Abstract
Abstract Aqueous media having a dissolved content of a small amount, (less than 100 p.p.m.) of a mixture of aminoalkanols of the formula: ##STR1## wherein R 1 and R 2 each represent H and C 1-18 unbranched alkyl substituents (the sum of the carbon atoms in R 1 and R 2 being 9 to 18), R 3 and R 4 each represent H,C 1-4 alkyl and C 2-4 hydroxyalkyl substituents, x represents 2 to 6, and y represents 0 to 1, the ##STR2## units in the aminoalkanols being of at least two different chain lengths in the range of 11 to 20 carbon atoms, possess decreased tendency to corrode iron-containing metals including steel. The mixtures are also useful in salt form. The efficiency of the mixture is improved by various additives which act synergistically therewith.
Inventors
- 👤 Volker Wehle
- 👤 Wolfgang Rupilius
- 👤 Jurgen Reiffert
- 👤 Gabriele Rogall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:34
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141; C23F11/142
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
171 words
An aqueous medium having an effective dissolved content in the range of 0.1 to 100 parts per million parts by weight as agent inhibiting the corrosiveness of said solution towards corrodible iron-containing metals, of an aminoalkanol material selected from the group consisting of mixtures of vicinal aminoalkanols having the formula: ##STR7## wherein R 1 and R 2 each represent a substituent selected from the group consisting of H and unbranched alkyl having from 1 to 18 carbon atoms and the sum of the carbon atoms in R 1 and R 2 is from 9 to 18, R 3 and R 4 each represent a substituent selected from the group consisting of H, C 1-4 alkyl and C 2-4 hydroxyalkyl; and x represents a value from 2 to 6 and y represents a value from 0 to 1 inclusive; the ##STR8## units in the aminoalkanols of said mixture being of at least two different chain lengths in the range from 11 to 20 carbon atoms and (2) water-soluble salts of said aminoalkanols.
Claim 2
Dependent Claim
171 words
An aqueous medium having an effective dissolved content in the range of 0.1 to 100 parts per million parts by weight as agent inhibiting the corrosiveness of said solution towards corrodible iron-containing metals, of an aminoalkanol material selected from the group consisting of mixtures of vicinal aminoalkanols having the formula: ##STR7## wherein R 1 and R 2 each represent a substituent selected from the group consisting of H and unbranched alkyl having from 1 to 18 carbon atoms and the sum of the carbon atoms in R 1 and R 2 is from 9 to 18, R 3 and R 4 each represent a substituent selected from the group consisting of H, C 1-4 alkyl and C 2-4 hydroxyalkyl; and x represents a value from 2 to 6 and y represents a value from 0 to 1 inclusive; the ##STR8## units in the aminoalkanols of said mixture being of at least two different chain lengths in the range from 11 to 20 carbon atoms and (2) water-soluble salts of said aminoalkanols.
Claim 3
Dependent Claim
17 words
An aqueous medium containing 1 to 50 parts per million parts by weight of said aminoalkanol mixture.
Claim 4
Dependent Claim
17 words
An aqueous medium containing 1 to 50 parts per million parts by weight of said aminoalkanol mixture.
Claim 5
Dependent Claim
22 words
An aqueous medium according to claim 1 wherein the aminoalkanol mixture therein has the formula: ##STR9## contains 15 to 18 carbon atoms.
Claim 6
Dependent Claim
24 words
An aqueous medium according to claim 1 having an effective dissolved content of divalent zinc ions as fortifying agent for said mixture of aminoalkanols.
Claim 7
Dependent Claim
26 words
An aqueous medium according to claim 1 having an effective dissolved content of a phosphonic acid sequestering agent as fortifying agent for said mixture of aminoalkanols.
Claim 8
Dependent Claim
14 words
An aqueous medium according to claim 5 wherein the phosphonic acid is hydroxyethanediphosphonic acid.
Claim 9
Dependent Claim
14 words
An aqueous medium according to claim 5 wherein the phosphonic acid is 3-amino-trimethylene-1-phosphonic acid.
Claim 10
Dependent Claim
31 words
An aqueous medium according to claim 1 having effective dissolved contents of a mixture of divalent zinc ions and a phosphonic sequestering agent as fortifying agent for said mixture of aminoalkanols.
Claim 11
Dependent Claim
199 words
An aqueous medium having an effective dissolved content, as agent inhibiting the corrosiveness of said solution towards corrodible iron-containing metals, of: (A) 1 to 50 parts per million parts by weight of an aminoalkanol material selected from the group consisting of mixtures of vicinal aminoalkanols having the formula: ##STR10## wherein R 1 and R 2 each represent a substituent selected from the group consisting of H and unbranched alkyl having from 1 to 18 carbon atoms and the sum of the carbon atoms in R 1 and R 2 is from 9 to 18, R 3 and R 4 each represent a substituent selected from the group consisting of H, C 1-4 alkyl and C 2-4 hydroxyalkyl, and X represents a value from 2 to 6 and y represents a value from 0 to 1 inclusive; the ##STR11## units in the aminoalkanols of said mixture being of at least two different chain lengths in the range from 11 to 20 carbon atoms; and water-soluble salts of said aminoalkanols; (B) 0.1 to 10 parts per million parts by weight of divalent zinc ions; and (C) 0.3 to 30 parts per million parts by weight of a phosphonic acid sequestering agent.
Claim 12
Dependent Claim
199 words
An aqueous medium having an effective dissolved content, as agent inhibiting the corrosiveness of said solution towards corrodible iron-containing metals, of: (A) 1 to 50 parts per million parts by weight of an aminoalkanol material selected from the group consisting of mixtures of vicinal aminoalkanols having the formula: ##STR10## wherein R 1 and R 2 each represent a substituent selected from the group consisting of H and unbranched alkyl having from 1 to 18 carbon atoms and the sum of the carbon atoms in R 1 and R 2 is from 9 to 18, R 3 and R 4 each represent a substituent selected from the group consisting of H, C 1-4 alkyl and C 2-4 hydroxyalkyl, and X represents a value from 2 to 6 and y represents a value from 0 to 1 inclusive; the ##STR11## units in the aminoalkanols of said mixture being of at least two different chain lengths in the range from 11 to 20 carbon atoms; and water-soluble salts of said aminoalkanols; (B) 0.1 to 10 parts per million parts by weight of divalent zinc ions; and (C) 0.3 to 30 parts per million parts by weight of a phosphonic acid sequestering agent.
Claim 13
Dependent Claim
26 words
An aqueous medium according to claim 9 wherein the aminoalkanol mixture therein has the formula: ##STR12## wherein the grouping ##STR13## contains 15 to 18 carbon atoms.
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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |