US4388156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum electrolysis in non-aqueous monomeric organic acid
Assignee: CNA Holdings LLC
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Filing: 1981-12-23
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Granted: 1983-06-14
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Expires: 2001-12-23
Abstract
Abstract The invention is directed to the electrochemical treatment of aluminum substrates in a non-aqueous solution of a polybasic organic acid to provide a surface complex which promotes the adhesion of subsequently applied coatings to said surface.
Inventors
- 👤 Thomas N. Gillich
- 👤 John E. Walls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:45
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/034; C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/06; C25D11/10; C25D9/00; C25D9/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A process for treating an aluminum containing sheet substrate which comprises electrolyzing said substrate as an anode in a non-aqueous electrolytic solution comprising a solvent having a dipole moment of at least 1.5 and a compatible monomeric polybasic organic acid, wherein said electrolysis is conducted at a voltage of from about 5 to about 120 volts, with a charge application of from about 1 to about 150 coulombs per square decimeter of substrate, in an electrolyte maintained at a temperature of from about -5° to about 60° C., with a cathode to anode distance of from about 1 to about 25 centimeters.
Claim 2
Dependent Claim
102 words
A process for treating an aluminum containing sheet substrate which comprises electrolyzing said substrate as an anode in a non-aqueous electrolytic solution comprising a solvent having a dipole moment of at least 1.5 and a compatible monomeric polybasic organic acid, wherein said electrolysis is conducted at a voltage of from about 5 to about 120 volts, with a charge application of from about 1 to about 150 coulombs per square decimeter of substrate, in an electrolyte maintained at a temperature of from about -5° to about 60° C., with a cathode to anode distance of from about 1 to about 25 centimeters.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein said solvent comprises one or more compounds selected from the group consisting of formamide, dimethyl sulfoxide, aniline, dimethyl formamide, mono-, di-, and tri-ethanol amine, and tetrahydrofuran.
Claim 4
Dependent Claim
36 words
The process of claim 1 wherein said monomeric, polybasic organic acid comprises one or more acids selected from the group consisting of sulfonic acids, phosphoric acids, carboxylic acids which are at least tribasic and phosphonic acids.
Claim 5
Dependent Claim
35 words
The process of claim 3 wherein said sulfonic acids are selected from the group consisting of tridecyl benzene sulfonic acid; dinonyl naphthalene disulfonic acid; 2,2'-stilbene disulfonic acid; dodecyl naphthalene disulfonic acid; di-n-butyl naphthalene disulfonic acid.
Claim 6
Dependent Claim
37 words
The process of claim 3 wherein said carboxylic acids are selected from the group consisting of nitrilo triacetic acid; 1,2,4,5-benzene tetracarboxylic acid; alginic acid; diethylene triamine penta-acetic acid; ethylendiamine tetra-acetic acid; and hydroxyethyl ethylene diamine triacetic acid.
Claim 7
Dependent Claim
26 words
The process of claim 3 wherein said phosphoric acids are selected from the group consisting of phytic acid; dodecyl-polyoxy ethylene phosphoric acid; and 2-ethylhexyl polyphosphoric acid.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the concentration of the acid in the electrolyte ranges from about 0.1% by weight to the saturation point.
Claim 9
Dependent Claim
16 words
The sheet produced according to the method of claims 1, 2, 3, 4, 5, 6, 7.
Claim 10
Dependent Claim
21 words
A photographic element which comprises a light sensitive composition adhered to the substrate prepared according to the process of claim 1.
Claim 11
Dependent Claim
30 words
A photographic element which comprises a hydrophilizing composition adhered to the substrate prepared according to the process of claim 1 and a light sensitive composition adhered to said hydrophilizing composition.
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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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |