US4113498A
Expired / Lapsed
US
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Corrosion inhibitor for metal surfaces
Assignee: GEA Group AG
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Filing: 1977-03-28
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Granted: 1978-09-12
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Expires: 1997-03-28
Abstract
Abstract Disclosed is a corrosion inhibitor for metal surfaces. The surface is contacted with an alkaline aqueous solution containing a reaction product of an aliphatic carboxylic acid, a polyhydroxy carboxylic acid and an alkanol amine.
Inventors
- 👤 Josef Rones
- 👤 Siegfried Moller
- 👤 Helmut Hoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:40
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
An aqueous composition which, when diluted with water, is suitable for inhibiting corrosion of metallic surfaces, comprising the reaction product of: (a) at least one aliphatic carboxylic acid having from 6 to 10 carbon atoms; (b) at least one polyhydroxycarboxylic acid having from 4 to 10 carbon atoms; and (c) an alkanolamine of an alkanol radical of up to 4 carbon atoms; wherein the weight ratio of component a : b is from 1 : 0.5 to 1 : 7 and the molar ratio of c : a+b is at least 1.3 : 1.
Claim 2
Dependent Claim
94 words
An aqueous composition which, when diluted with water, is suitable for inhibiting corrosion of metallic surfaces, comprising the reaction product of: (a) at least one aliphatic carboxylic acid having from 6 to 10 carbon atoms; (b) at least one polyhydroxycarboxylic acid having from 4 to 10 carbon atoms; and (c) an alkanolamine of an alkanol radical of up to 4 carbon atoms; wherein the weight ratio of component a : b is from 1 : 0.5 to 1 : 7 and the molar ratio of c : a+b is at least 1.3 : 1.
Claim 3
Dependent Claim
12 words
The composition of claim 1 containing from 10 to 80 wt.% water.
Claim 4
Dependent Claim
13 words
The composition of claim 1 wherein the aliphatic carboxylic acid is caprylic acid.
Claim 5
Dependent Claim
20 words
The composition of claim 1 wherein the polyhydroxycarboxylic acid is selected from the group consisting of tartaric and gluconic acids.
Claim 6
Dependent Claim
18 words
The composition of claim 1 wherein the alkanolamine is selected from the group consisting of mono-and diethanol amine.
Claim 7
Dependent Claim
19 words
An aqueous corrosion inhibiting composition comprising the composition of claim 1 diluted to 0.5 to 5 wt.% in water.
Claim 8
Dependent Claim
14 words
The composition of claim 6 exhibiting a pH value of from 7.5 to 10.0.
Claim 9
Dependent Claim
20 words
A process for imparting corrosion resistance to a metal surface comprising contacting the surface with the composition of claim 7.
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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |