US5472630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low phosphorous, low etch cleaner and method
Assignee: Veolia WTS USA Inc
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Filing: 1994-03-24
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Granted: 1995-12-05
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Expires: 2014-03-24
Abstract
Abstract Compositions and methods for cleaning and etching an aluminum surface with a low etch, low phosphate alkaline cleaner solution are disclosed. The preferred composition employs a stable combination of an alkali metal hydroxide, gluconic acid, a detergent source, an aluminum sequestrant, an oil emulsifier, a defoamer, and a hydrotrope.
Inventors
- 👤 Jiangbo Ouyang
- 👤 Edward A. Rodzewich
- 👤 William L. Harpel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:16
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/66; C11D1/83; C11D3/00; C11D3/16; C11D3/20; C11D3/2075; C11D3/2086; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3765; C11D7/00; C11D7/02; C11D7/04; C11D7/06; C23; C23G; C23G1/00; C23G1/14; C23G1/22; C11D1/02; C11D1/34; C11D1/345; C11D1/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A method for cleaning and etching an aluminum surface, said method comprising applying to an aluminum surface a low aluminum etch, low phosphate-containing alkaline cleaning solution comprising, by volume percent, 5 to 50% alkali metal hydroxide and 0.5 to 10% gluconic acid, the improvement further comprising a stable combination of 0.2 to 5% of a detergent selected from the group consisting of trimethylnonanol polyethyleneglycol ether with 6 moles ethylene oxide, 0.5 to 10% of an aluminum sequestrant selected from the group consisting of poly(acrylic) acid, 0.5 to 10% of an oil emulsifier selected from the group consisting of potassium C 5 to C 18 alkoxy phenoxy carboxy phosphate, 0.05 to 5% of a defoamer, and 0.4 to 20% of a hydrotrope.
Claim 2
Independent Claim
121 words
A method for cleaning and etching an aluminum surface, said method comprising applying to an aluminum surface a low aluminum etch, low phosphate-containing alkaline cleaning solution comprising, by volume percent, 5 to 50% alkali metal hydroxide and 0.5 to 10% gluconic acid, the improvement further comprising a stable combination of 0.2 to 5% of a detergent selected from the group consisting of trimethylnonanol polyethyleneglycol ether with 6 moles ethylene oxide, 0.5 to 10% of an aluminum sequestrant selected from the group consisting of poly(acrylic) acid, 0.5 to 10% of an oil emulsifier selected from the group consisting of potassium C 5 to C 18 alkoxy phenoxy carboxy phosphate, 0.05 to 5% of a defoamer, and 0.4 to 20% of a hydrotrope.
Claim 3
Dependent Claim
15 words
The method as claimed in claim 1 wherein said alkali metal hydroxide is potassium hydroxide.
Claim 4
Dependent Claim
41 words
The method as claimed in claim 1 wherein said defoamer is a reverse ethyleneoxide-propylene oxide block copolymer of the general structure (R'O)--(RO) n --(R'O) where R is an ethylene group, R' is a propylene group and n is 5 or greater.
Claim 5
Dependent Claim
13 words
The method as claimed in claim 1 wherein said hydrotrope is sodium alkanoate.
Claim 6
Dependent Claim
16 words
The method as claimed in claim 1 wherein said solution is sprayed onto the aluminum surface.
Claim 7
Dependent Claim
27 words
The method as claimed in claim 1 wherein said solution is sprayed onto the aluminum surfaces at a temperature of about 100° F. to about 150° F.
Claim 8
Dependent Claim
19 words
The method as claimed in claim 1 wherein said solution is diluted to about 1 to 6% in water.
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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) | 1998-12-04 | 1999-06-05 | 1999-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-04 | 2003-06-05 | 2003-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-04 | 2007-06-05 | 2007-12-05 | $7700.00 | Window Closed / Lapsed |