US4214022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating metal by immersion
Assignee: Akzo NV
•
Filing: 1977-10-28
•
Granted: 1980-07-22
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Expires: 1997-10-28
Abstract
Abstract A coating of a film-forming material is applied without electricity to a metal by immersing the metal in an aqueous dispersion which contains a film-forming material cationically dispersed in a cationic dispersion which contains a carboxylic acid radical capable of reacting with metal ions obtained by etching the metal to form a negatively charged complex in the dispersion.
Inventors
- 👤 Jan Kunnen
- 👤 Abraham C. Van Der Schee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:19
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/088; B; B05; B05D; B05D7/00; B05D7/14; B05D7/142
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
In an autodeposition process of applying a coating of film-forming material to an acid-etchable metal wherein the metal surface is contacted with an aqueous dispersion of the film-forming material which contains a metal-etching acid, followed by drying the coating, the improvement which comprises dispersing the film-forming material in a cationic dispersion containing at least 0.1% cationic surfactant and a carboxylic acid radical which along with the metal ions obtained by etching the metal surface is capable of forming a negatively charged complex in the dispersion.
Claim 2
Dependent Claim
85 words
In an autodeposition process of applying a coating of film-forming material to an acid-etchable metal wherein the metal surface is contacted with an aqueous dispersion of the film-forming material which contains a metal-etching acid, followed by drying the coating, the improvement which comprises dispersing the film-forming material in a cationic dispersion containing at least 0.1% cationic surfactant and a carboxylic acid radical which along with the metal ions obtained by etching the metal surface is capable of forming a negatively charged complex in the dispersion.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the metal substrate is steel.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the cationic dispersion contains a cationic or amphoteric surface active compound.
Claim 5
Dependent Claim
23 words
The process of claim 3 wherein the cationic polymer dispersion contains 0.1-15% by weight of surface active compound, based on the film-forming polymer.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the pH of the cationic dispersion has a value below about 6.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the acidic polymer dispersion contains a carboxylic acid radical derived from mandelic acid.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein the acidic polymer dispersion contains a carboxylic acid radical derived from malic acid.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the acidic polymer dispersion contains a carboxylic acid radical derived from citric acid.
Claim 10
Dependent Claim
56 words
An autodeposition process for coating an acid-etchable metal with a polymer which comprises covering the metal with a cationic dispersion of a polymer in water containing a metal-etching acid and a carboxylic acid radical which forms a negatively charged complex with metal ions in the dispersion resulting from etching of the metal with said metal-etching acid.
Claim 11
Dependent Claim
56 words
An autodeposition process for coating an acid-etchable metal with a polymer which comprises covering the metal with a cationic dispersion of a polymer in water containing a metal-etching acid and a carboxylic acid radical which forms a negatively charged complex with metal ions in the dispersion resulting from etching of the metal with said metal-etching acid.
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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) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |