US4404039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleanser for anodized surfaces of aluminum and alloys thereof and method for using same
Assignee: Henkel AG and Co KGaA
•
Filing: 1982-04-29
•
Granted: 1983-09-13
•
Expires: 2002-04-29
Abstract
Abstract This invention relates to an improved process for cleaning an anodized surface of aluminum or an alloy thereof where a cleaning agent is applied to the anodized surface and then the cleaning agent is removed after a sufficient period of contact, wherein the improvement comprises applying to the anodized surface at ambient temperature a thin film of a cleaning composition comprising an acid solution consisting essentially of: (a) from about 3 to 30 percent by weight, based upon the total weight of the acid solution, of nitric acid, calculated as a 65% aqueous solution; (b) from about 0.1 to 20 percent by weight, based upon the total weight of the acid solution, of partial esters of phosphoric acid; (c) from about 0.3 to 30 percent by weight, based upon the total weight of the acid solution, of a phosphonocarboxylic acid with complexing action; (d) from about 0.5 to 30 percent by weight, based upon the total weight of the acid solution, of nonionic and/or anionic tensides; (e) from 0 to about 30 percent by weight, based upon the total weight of the acid solution, of solubilizers and/or organic solvents; and (f) from about 40 to 90 percent by weight, based upon the total weight of the acid solution, of water, said solution having a pH of less than 2, and then rinsing off the cleaning composition with water.
Inventors
- 👤 Rainer Osberghaus
- 👤 Hans Ellwanger
- 👤 Horst Marsen
- 👤 Harald Bossek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:24
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/02; C11D7/04; C11D7/08; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
227 words
In a process for cleaning an anodized surface of aluminum or an alloy thereof where a cleaning agent is applied to the anodized surface and then the cleaning agent is removed after a sufficient period of contact, the improvement which comprises applying to the anodized surface at ambient temperature a thin film of a cleaning composition comprising an acid solution consisting essentially of: (a) from about 3 to 30 percent by weight, based upon the total weight of the acid solution, of nitric acid, calculated as a 65% aqueous solution; (b) from about 0.1 to 20 percent by weight, based upon the total weight of the acid solution, of partial esters of phosphoric acid; (c) from about 0.3 to 30 percent by weight, based upon the total weight of the acid solution, of a phosphonic acid or phosphonocarboxylic acid with complexing action; (d) from about 0.5 to 30 percent by weight, based upon the total weight of the acid solution, of nonionic and/or anionic tensides; (e) from 0 to about 30 percent by weight, based upon the total weight of the acid solution, of solubilizers and/or organic solvents; and (f) from about 40 to 90 percent by weight, based upon the total weight of the acid solution, of water, said solution having a pH of less than 2, and then rinsing off the cleaning composition with water.
Claim 2
Dependent Claim
227 words
In a process for cleaning an anodized surface of aluminum or an alloy thereof where a cleaning agent is applied to the anodized surface and then the cleaning agent is removed after a sufficient period of contact, the improvement which comprises applying to the anodized surface at ambient temperature a thin film of a cleaning composition comprising an acid solution consisting essentially of: (a) from about 3 to 30 percent by weight, based upon the total weight of the acid solution, of nitric acid, calculated as a 65% aqueous solution; (b) from about 0.1 to 20 percent by weight, based upon the total weight of the acid solution, of partial esters of phosphoric acid; (c) from about 0.3 to 30 percent by weight, based upon the total weight of the acid solution, of a phosphonic acid or phosphonocarboxylic acid with complexing action; (d) from about 0.5 to 30 percent by weight, based upon the total weight of the acid solution, of nonionic and/or anionic tensides; (e) from 0 to about 30 percent by weight, based upon the total weight of the acid solution, of solubilizers and/or organic solvents; and (f) from about 40 to 90 percent by weight, based upon the total weight of the acid solution, of water, said solution having a pH of less than 2, and then rinsing off the cleaning composition with water.
Claim 3
Dependent Claim
20 words
The process of claim 1, wherein component (a) comprises from about 5 to 20 percent by weight of nitric acid.
Claim 4
Dependent Claim
23 words
The process of claim 1, wherein component (b) comprises from about 0.2 to 10 percent by weight of partial esters of phosphoric acid.
Claim 5
Dependent Claim
27 words
The process of claim 1, wherein component (c) comprises from about 0.5 to 20 percent by weight of a phosphonic acid or phosphonocarboxylic acid with complexing action.
Claim 6
Dependent Claim
19 words
The process of claim 1, wherein component (d) comprises from about 1 to 20 percent by weight of tenside.
Claim 7
Dependent Claim
21 words
The process of claim 1, wherein component (e) comprises from 0 to about 20 percent by weight of solubilizers and/or solvent.
Claim 8
Dependent Claim
19 words
The process of claim 1, wherein component (f) comprises from about 49 to 80 percent by weight of water.
Claim 9
Dependent Claim
21 words
The process of claim 1, wherein the cleaning composition remains on the anodized surface for from about 2 to 60 minutes.
Claim 10
Dependent Claim
177 words
A cleansing composition for cleaning an anodized surface of aluminum or an alloy thereof which comprises an aqueous acid solution consisting essentially of: (a) from about 3 to 30 percent by weight, based upon the total weight of the solution, of nitric acid, calculated as a 65% aqueous solution; (b) from about 0.1 to 2 percent by weight, based upon the total weight of the acid solution, of partial esters of phosphoric acid; (c) from about 0.3 to 30 percent by weight, based upon the total weight of the acid solution, of a phosphonic acid or phosphonocarboxylic acid with complexing action; (d) from about 0.5 to 30 percent by weight, based upon the total weight of the acid solution, of nonionic and/or anionic tensides; (e) from 0 to about 30 percent by weight, based upon the total weight of the acid solution, of solubilizers and/or organic solvents; and (f) from about 40 to 90 percent by weight, based upon the total weight of the acid solution, of water, said solution having a pH of less than 2.
Claim 11
Dependent Claim
177 words
A cleansing composition for cleaning an anodized surface of aluminum or an alloy thereof which comprises an aqueous acid solution consisting essentially of: (a) from about 3 to 30 percent by weight, based upon the total weight of the solution, of nitric acid, calculated as a 65% aqueous solution; (b) from about 0.1 to 2 percent by weight, based upon the total weight of the acid solution, of partial esters of phosphoric acid; (c) from about 0.3 to 30 percent by weight, based upon the total weight of the acid solution, of a phosphonic acid or phosphonocarboxylic acid with complexing action; (d) from about 0.5 to 30 percent by weight, based upon the total weight of the acid solution, of nonionic and/or anionic tensides; (e) from 0 to about 30 percent by weight, based upon the total weight of the acid solution, of solubilizers and/or organic solvents; and (f) from about 40 to 90 percent by weight, based upon the total weight of the acid solution, of water, said solution having a pH of less than 2.
Claim 12
Dependent Claim
20 words
The composition of claim 9, wherein component (a) comprises from about 5 to 20 percent by weight of nitric acid.
Claim 13
Dependent Claim
23 words
The composition of claim 9, wherein component (b) comprises from about 0.2 to 10 percent by weight of partial esters of phosphoric acid.
Claim 14
Dependent Claim
27 words
The composition of claim 9, wherein component (c) comprises from about 0.5 to 20 percent by weight of a phosphonic acid or phosphonocarboxylic acid with complexing action.
Claim 15
Dependent Claim
19 words
The composition of claim 9, wherein component (d) comprises from about 1 to 20 percent by weight of tenside.
Claim 16
Dependent Claim
21 words
The composition of claim 9, wherein component (e) comprises from 0 to about 20 percent by weight of solubilizers and/or solvent.
Claim 17
Dependent Claim
19 words
The composition of claim 9, wherein component (f) comprises from about 49 to 80 percent by weight of water.
References Cited (Backward Citations)
US3004879A
Cited
US3645790A
Cited
US3663327A
Cited
US3738937A
Cited
US3932243A
Cited
DE2436278A1
Cited
DE2621573A1
Cited
US4169068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |