US4215162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of coating metal surfaces
Assignee: Akzo NV
•
Filing: 1977-10-28
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Granted: 1980-07-29
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Expires: 1997-10-28
Abstract
Abstract A process is provided for applying a coating of film-forming material to an acid-etchable metal without the use of electricity wherein the metal is immersed in an aqueous dispersion of a film-forming material cationically dispersed in water which also contains the carboxylic acid radical derived from acrylic acid or methacrylic acid or an oligomer thereof, and the resulting wet coating is dried on the surface of the metal.
Inventors
- 👤 Jan Kunnen
- 👤 Abraham C. Van Der Schee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:01
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/142; C; C09; C09D; C09D5/00; C09D5/08; C09D5/088
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
In an autodeposition process of applying a coating of film-forming material to an acid-etchable metal, the metal surface being 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 cationically dispersing the film-forming material in a cationic dispersion which contains the carboxylic acid radical derived from acrylic acid, methacrylic acid or an oligomer thereof and a cationic surfactant in an amount of at least 0.1% by weight.
Claim 2
Dependent Claim
80 words
In an autodeposition process of applying a coating of film-forming material to an acid-etchable metal, the metal surface being 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 cationically dispersing the film-forming material in a cationic dispersion which contains the carboxylic acid radical derived from acrylic acid, methacrylic acid or an oligomer thereof and a cationic surfactant in an amount of at least 0.1% by weight.
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
22 words
The process of claim 3 wherein the cationic 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
44 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 derived from acrylic acid, methacrylic acid or an oligomer thereof.
Claim 8
Dependent Claim
44 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 derived from acrylic acid, methacrylic acid or an oligomer thereof.
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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) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |