Patent US3791431A successfully refreshed from Google Patents.
US3791431A
Expired / Lapsed
US
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Process for coating metals
Assignee: Henkel Corp
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Filing: 1972-05-26
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Granted: 1974-02-12
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Expires: 1992-05-26
Abstract
Abstract Acidic aqueous coating compositions containing an organic coating-forming material form coatings on metallic surfaces which are immersed therein. The coating composition tends to become unstable as a result of the buildup of metallic ions in the composition. The coating composition is stabilized by removing the metallic ions from the composition or rendering them ineffective for causing the composition to become unstable.
Inventors
- 👤 L Steinbrecher
- 👤 W Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:18
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/142; C; C09; C09D; C09D5/00; C09D5/08; C09D5/088; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C10; C10M; C10M2201/00; C10M2201/02; C10M2201/04; C10M2201/041; C10M2201/06; C10M2201/063; C10M2201/08; C10M2201/081; C10M2201/082; C10M2201/083; C10M2201/084; C10M2201/085; C10M2201/086; C10M2203/00; C10M2203/10; C10M2203/102; C10M2203/104; C10M2203/106; C10M2203/108; C10M2205/00; C10M2205/02; C10M2205/022; C10M2205/06; C10M2205/14; C10M2205/16; C10M2205/17; C10M2205/18; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/04; C10M2207/046; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/122; C10M2207/123; C10M2207/124; C10M2207/125; C10M2207/129; C10M2207/22; C10M2207/28; C10M2207/287; C10M2207/289; C10M2207/40; C10M2207/404; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/104; C10M2211/00; C10M2211/04; C10M2211/044; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062; C10M2215/00; C10M2215/22; C10M2215/225; C10M2215/227; C10M2219/00; C10M2219/02; C10M2219/022; C10M2219/024; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10N; C10N2010/00; C10N2010/02; C10N2040/00; C10N2040/20; C10N2040/22; C10N2040/24; C10N2040/241; C10N2040/242; C10N2040/243; C10N2040/244; C10N2040/245; C10N2040/246; C10N2040/247; C10N2050/00; C10N2050/01; C10N2050/015; C10N2050/02; C10N2080/00
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
46 words
adding a material to said composition which converts said metal ions to an innocuous form, that is, a form in which they do not cause said coating-forming material to become unstable in said other portions of said composition; thereby maintaining said composition operative for continued coating.
Claim 2
Dependent Claim
32 words
The method according to claim 1 including adding to said composition a precipitating agent for forming a precipitate with said metal ions, forming said precipitate and separating said precipitate from said composition.
Claim 3
Dependent Claim
46 words
adding a material to said composition which converts said metal ions to an innocuous form, that is, a form in which they do not cause said coating-forming material to become unstable in said other portions of said composition, thereby maintaining said composition operative for continued coating.
Claim 4
Dependent Claim
35 words
The method according to claim 1 including adding to said composition a chelating agent for said metal ions and forming a chelate with said metal ions thereby converting said metal ions to said innocuous form.
Claim 5
Dependent Claim
14 words
The method according to claim 1 wherein said coating-forming material is a synthetic resin.
Claim 6
Dependent Claim
14 words
The method according to claim 1 wherein said metallic surface is a ferriferous surface.
Claim 7
Dependent Claim
176 words
In the method wherein a corrosion resistant, synthetic resinous coating is applied to a metallic surface by immersing the surface in an acidic aqueous coating composition containing dispersed particles of a synthetic resinous coating-forming material and an oxidizing agent and wherein metal ions are dissolved from said surface by the chemical Action of said coating composition, and wherein said coating-forming material becomes unstable in the region of said surface and deposits thereon to form said resinous coating, the thickness or amount of which increases during at least a portion of the time said surface is immersed in said composition, and wherein additional metallic surfaces are immersed in said composition and are coated as set forth, and wherein during continued use, said coating-forming material tends to become unstable throughout the other portions of said composition thereby rendering said composition inoperative for coating, the improvement comprising maintaining the amount of said metal ions in the composition at a value at which they do not cause destabilization of said coating-forming material in said other portions of said composition by:
Claim 8
Dependent Claim
31 words
The method according to claim 6 wherein said metal surface is a ferriferous surface, wherein said metal ions are iron ions and wherein said iron ions are removed from said composition.
Claim 9
Dependent Claim
32 words
The method of claim 7 wherein the amount of iron ions removed from said composition is such that the amount of iron ions in the composition is about 1.5 g/l or less.
Claim 10
Dependent Claim
38 words
The method according to claim 6 wherein said metal surface is a ferriferous surface, wherein said metal ions are ferric ions and wherein the amount of ferric ions maintained in the composition is about 1.5 g/l or less.
Claim 11
Dependent Claim
15 words
The method according to claim 9, wherein said ferric ions are removed from said composition.
Claim 12
Dependent Claim
39 words
The method according to claim 10, wherein said ferric ions are removed from said composition by adding thereto a precipitating agent for forming a precipitate with said ferric ions, forming said precipitate and separating said precipitate from said composition.
Claim 13
Dependent Claim
23 words
The method according to claim 11 wherein said precipitating agent is phosphoric acid and wherein iron phosphate precipitate is separated from said composition.
Claim 14
Dependent Claim
28 words
The method according to claim 11 wherin said precipitating agent is a mixture of potassium bifluoride and sodium bifluoride and wherein K2NaFeF6 precipitate is separated from said composition.
Claim 15
Dependent Claim
24 words
The method according to claim 13 wherein the molar ratio of said potassium bifluoride to said sodium bifluoride is about 0.5 to about 3.
Claim 16
Dependent Claim
23 words
The method according to claim 6 wherein said metal surface is an aluminum surface and wherein aluminum ions are removed from said composition.
Claim 17
Dependent Claim
39 words
The method according to claim 15 wherein said aluminum ions are removed from said composition by adding thereto a precipitating agent for forming a precipitate with said aluminum ions, forming said precipitate and separating said precipitate from said composition.
Claim 18
Dependent Claim
28 words
The method according to claim 16 wherein said precipitating agent is a mixture of potassium bifluoride and sodium bifluoride and wherein K2NaAlF6 precipitate is separated from said composition.
Claim 19
Dependent Claim
24 words
The method according to claim 17 wherein the molar ratio of said potassium bifluoride to said sodium bifluoride is about 0.5 to about 3.
Claim 20
Dependent Claim
35 words
The method according to claim 6 including adding to said composition a chelating agent for said metal ions and forming a chelate with said metal ions thereby converting said metal ions to said innocuous form.
Claim 21
Dependent Claim
39 words
The method according to claim 19 wherein said metal surface is a ferriferous surface and wherein said metal ions are ferric ions and wherein the amount of ferric ions maintained in the composition is about 1.5 g/l or less.
Claim 22
Dependent Claim
15 words
The method according to claim 20 wherein said chelating agent is ethylene diAmine tetraacetic acid.
Claim 23
Dependent Claim
26 words
The method according to claim 20 wherein said chelating agent is selected from the group consisting of citric acid, gluconic acid, tartaric acid and lactic acid.
Claim 24
Dependent Claim
98 words
The method according to claim 6 wherein said composition comprises: a. about 5 to about 550 g/l of said coating-forming material; b. about 0.4 to about 5 g/l of fluoride ion; c. an oxidizing agent selected from the class consisting of H2O2and dichromate in an amount sufficient to provide about 0.01 to about 0.2 oxidizing equivalent per liter of composition; and d. hydrogen ion in an amount sufficient to impart a pH to the composition of about 1.6 to about 3.8; and wherein said metallic surface is a ferriferous surface and wherein said metal ions are ferric ions.
Claim 25
Dependent Claim
22 words
The method according to claim 23 wherein the amount of ferric ions maintained in the composition is about 1.5 g/l or less.
Claim 26
Dependent Claim
15 words
The method according to claim 23 wherein said ferric ions are removed from said composition.
Claim 27
Dependent Claim
44 words
The method according to claim 25 wherein said coating-forming material is selected from the group consisting of styrene-butadiene, acrylonitrile-butadiene, polyethylene, acrylic, tetrafluoroethylene and polyvinyl chloride resins, wherein said oxidizing agent is hydrogen peroxide and wherein the source of said fluoride ion is hydrofluoric acid.
Claim 28
Dependent Claim
22 words
The method according to claim 26 wherein the amount of ferric ions maintained in the composition is about 1.5 g/l or less.
References Cited (Backward Citations)
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |