US4877552A
Expired / Lapsed
US
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Corrosion inhibitor
Assignee: BASF Corp
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Filing: 1987-08-28
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Granted: 1989-10-31
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Expires: 2007-08-28
Abstract
Abstract Corrosion inhibitors comprising (a) an imidazoline of the formula I ##STR1## in which R 1 is hydrogen, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -aminoalkyl or C 2 -C 19 -carboxyalky or an ammonium or amine salt thereof and R 2 is hydrogen, C 1 -C 17 -alkyl or C 2 -C 17 -alkenyl, (b) a heterocyclic polyacid of the formula II ##STR2## in which R 3 is C 2 -C 6 -carboxyalkyl or an alkali metal, alkaline earth metal, ammonium or amine salt thereof, (c) at least one alkanolamine of the formula III ##STR3## in which R 4 is C 1 -C 6 -hydroxyalkyl and R 5 and R 6 , which can be identical or different, are hydrogen, C 1 -C 6 -alkyl or C 1 -C 6 -hydroxyalkyl, and (d) water are outstandingly suitable for the corrosion-inhibiting treatment of shaped iron and steel parts.
Inventors
- 👤 Ulrich Haring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:26
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141; C23F11/142; C23F11/149
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
148 words
A corrosion inhibitor comprising (a) an imidazoline of the formula I ##STR8## in which R 1 is hydrogen, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -aminoalkyl or C 2 -C 19 -carboxyalkyl or an ammonia or amine salt thereof and R 2 is hydrogen, C 1 -C 17 -alkyl or C 2 -C 17 -alkenyl, (b) a heterocyclic polyacid of the formula II ##STR9## in which R 3 is C 4 -C 6 -carboxyalkyl or an alkali metal, alkaline earth metal, ammonium or amine salt thereof, (c) at least one alkanolamine of the formula III ##STR10## in which R 4 is C 1 -C 6 -hydroxyalkyl and R 5 and R 6 , which can be identical or different, are hydrogen, C 1 -C 6 -alkyl or C 1 -C 6 -hydroxyalkyl, and (d) water, wherein the ratio a:e (with b+c+d=e) is 1:1 up to 1:80.
Claim 2
Dependent Claim
148 words
A corrosion inhibitor comprising (a) an imidazoline of the formula I ##STR8## in which R 1 is hydrogen, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -aminoalkyl or C 2 -C 19 -carboxyalkyl or an ammonia or amine salt thereof and R 2 is hydrogen, C 1 -C 17 -alkyl or C 2 -C 17 -alkenyl, (b) a heterocyclic polyacid of the formula II ##STR9## in which R 3 is C 4 -C 6 -carboxyalkyl or an alkali metal, alkaline earth metal, ammonium or amine salt thereof, (c) at least one alkanolamine of the formula III ##STR10## in which R 4 is C 1 -C 6 -hydroxyalkyl and R 5 and R 6 , which can be identical or different, are hydrogen, C 1 -C 6 -alkyl or C 1 -C 6 -hydroxyalkyl, and (d) water, wherein the ratio a:e (with b+c+d=e) is 1:1 up to 1:80.
Claim 3
Dependent Claim
26 words
A corrosion inhibitor according to claim 1, wherein R 1 in the formula I is C 1 -C 3 -hydroxyalkyl or C 2 -C 6 -aminoalkyl.
Claim 4
Dependent Claim
16 words
A corrosion inhibitor according to claim 2, wherein R 1 in the formula I is 2-hydroxyethyl.
Claim 5
Dependent Claim
26 words
A corrosion inhibitor according to claim 1, wherein R 2 in the formula I is C 11 -C 17 -alkyl or C 12 -C 17 -alkenyl.
Claim 6
Dependent Claim
18 words
A corrosion inhibitor according to claim 4, wherein R 2 in the formula I is C 11 -alkyl.
Claim 7
Dependent Claim
18 words
A corrosion inhibitor according to claim 4, wherein R 2 in the formula I is C 17 -alkenyl.
Claim 8
Dependent Claim
18 words
A corrosion inhibitor according to claim 1, wherein R 3 in the formula II is C 6 -carboxyalkyl.
Claim 9
Dependent Claim
16 words
A corrosion inhibitor according to claim 1, wherein R 4 in the formula III is 2-hydroxethyl.
Claim 10
Dependent Claim
20 words
A corrosion inhibitor according to claim 1, wherein R 5 in the formula III is C 1 -C 6 -hydroxyalkyl.
Claim 11
Dependent Claim
16 words
A corrosion inhibitor according to claim 9, wherein R 5 in the formula III is 2-hydroxyethyl.
Claim 12
Dependent Claim
19 words
A corrosion inhibitor according to claim 1, wherein R 4 and R 5 in the formula III are 2-hydroxyethyl.
Claim 13
Dependent Claim
23 words
A corrosion inhibitor according to claim 1, wherein R 5 and R 6 in the formula III are C 1 -C 6 -hydroxyalkyl.
Claim 14
Dependent Claim
19 words
A corrosion inhibitor according to claim 12, wherein R 5 and R 6 in the formula III are 2-hydroxyethyl.
Claim 15
Dependent Claim
22 words
A corrosion inhibitor according to claim 1, wherein R 4 , R 5 and R 6 in the formula III are 2-hydroxyethyl.
Claim 16
Dependent Claim
18 words
A corrosion inhibitor according to claim 1, wherein component (c) is a mixture of ethanolamine, diethanolamine and triethanolamine.
Claim 17
Dependent Claim
18 words
A composition comprising an aqueous system or a water/oil emulsion and a corrosion inhibitor according to claim 1.
Claim 18
Dependent Claim
52 words
A composition according to claim 16, wherein the content of imidazoline of the formula I is 0.02-5% by weight, that of the heterocyclic polyacid of the formula II is 0.02-5% by weight and that of the alkanolamine, of which there is at least one, of the formula III is 0.1-15% by weight.
Claim 19
Dependent Claim
53 words
A composition according to claim 17 wherein the content of the imidazoline of the formula I is 0.1-2% by weight, that of the heterocyclic polyacid of the formula II is 0.1-2% by weight and that of the alkanolamine, of which there is at least one, of the formula III is 0.5-10% by weight.
Claim 20
Dependent Claim
26 words
A process for inhibiting the corrosion of shaped iron and steel parts by applying a corrosion inhibitor as described in claim 1 on the surfaces 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) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |