US4435223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-fluoride acid compositions for cleaning aluminum surfaces
Assignee: Henkel Corp
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Filing: 1982-05-18
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Granted: 1984-03-06
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Expires: 2002-05-18
Abstract
Abstract Compositions and methods for cleaning aluminum surfaces wherein the cleaning compositions contain sulfuric acid, phosphoric acid, and at least one surfactant.
Inventors
- 👤 David Y. Dollman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:45
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
A process for cleaning an aluminum based surface comprising the steps of (a) contacting said surface with an aqueous cleaning solution which is free of hydrofluoric acid and other fluorides and which comprises from about 4 to about 24 grams/liter of sulfuric acid, from about 9 to about 22 grams/liter of orthophosphoric acid, and from about 0.1 to about 7.5 grams/liter of a surfactant at a temperature in the range of from about 90° F. to about 140° F. and a treatment time of from about 10 seconds to about 1 minute, and (b) rinsing the aluminum based surface to remove the cleaning solution therefrom.
Claim 2
Dependent Claim
105 words
A process for cleaning an aluminum based surface comprising the steps of (a) contacting said surface with an aqueous cleaning solution which is free of hydrofluoric acid and other fluorides and which comprises from about 4 to about 24 grams/liter of sulfuric acid, from about 9 to about 22 grams/liter of orthophosphoric acid, and from about 0.1 to about 7.5 grams/liter of a surfactant at a temperature in the range of from about 90° F. to about 140° F. and a treatment time of from about 10 seconds to about 1 minute, and (b) rinsing the aluminum based surface to remove the cleaning solution therefrom.
Claim 3
Dependent Claim
74 words
A process in accordance with claim 1 wherein in step (a) the surfactant is a combination of from about 0.25 to about 1.0 grams/liter of a high detergency surfactant, and from about 0.25 to about 1.0 grams/liter of a low foaming surfactant, and where a surfactant is both a high detergency surfactant and a low foaming surfactant, then such surfactant is employed alone in a quantity of from about 0.5 to about 2.0 grams/liter.
Claim 4
Dependent Claim
24 words
A process in accordance with claim 1 wherein the sulfuric acid in step (a) is present in from about 6 to about 15 grams/liter.
Claim 5
Dependent Claim
24 words
A process in accordance with claim 1 wherein the phosphoric acid in step (a) is present in from about 10 to about 20 grams/liter.
Claim 6
Dependent Claim
25 words
A process in accordance with claim 2 wherein the high detergency surfactant in step (a) is present in from about 0.40 to about 0.80 grams/liter.
Claim 7
Dependent Claim
25 words
A process in accordance with claim 2 wherein the low foaming surfactant in step (a) is present in from about 0.40 to about 0.75 grams/liter.
Claim 8
Dependent Claim
30 words
A process in accordance with claim 2 wherein the high detergency surfactant in step (a) gives a result of at least 90% in the Hard-Surface Cleaning Test on stainless steel.
Claim 9
Dependent Claim
34 words
A process in accordance with claim 2 wherein the low foaming surfactant in step (a) has less than 20 mm. of foam after five minutes standing in the Ross-Miles Foam Test at 50° C.
Claim 10
Dependent Claim
27 words
A process in accordance with claim 2 wherein the high detergency surfactant in step (a) is an ethoxylated abietic acid derivative with approximately 15 moles of ethoxylation.
Claim 11
Dependent Claim
20 words
A process in accordance with claim 2 wherein the low foaming surfactant in step (a) is an alkyl polyethoxylated ether.
Claim 12
Dependent Claim
23 words
A process in accordance with claim 1 wherein the treatment time in step (a) is from about 30 seconds to about 1 minute.
Claim 13
Dependent Claim
26 words
A process in accordance with claim 1 wherein the aluminum based surface is contacted with the aqueous cleaning solution by spraying said solution onto the surface.
Claim 14
Dependent Claim
25 words
A process in accordance with claim 1 wherein the solution temperature is maintained in the range of from about 115° F. to about 140° F.
Claim 15
Dependent Claim
20 words
A process in accordance with claim 1 wherein the aluminum based surface is the surface of an aluminum based can.
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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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |