US4026710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of zinc flake coating composition
Assignee: Diamond Shamrock Corp
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Filing: 1975-01-27
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Granted: 1977-05-31
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Expires: 1995-01-27
Abstract
Abstract A coating composition for application to a metal substrate can desirably contain CrO 3 and zinc flake in aqueous medium, as well as containing organic liquid. Such compositions will provide a corrosion and alkali resistant coating to the metal. The zinc flake can be mechanically flattened from non-flake starting material, in a liquid medium that includes organic liquid for the coating composition. Efficiency of compositional preparation initiating with flake preparation is thereby achieved.
Inventors
- 👤 Alexander W. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:33
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/10; C09D5/106
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
214 words
A process for making a zinc flake and hexavalent chrome-containing coating composition for providing an adherent and corrosion-resistant coating on a metal substrate, wherein the medium of said coating composition is supplied by water plus organic substance, which process comprises: (A) combining finely divided non-flaked zinc metal with a flaking medium liquid organic substance selected from the group consisting of diacetone alcohol, 2-ethoxyethanol and 2-butoxyethanol in an amount sufficient to provide a weight ratio of zinc metal to said substance of between about 3:1 and 1:3; (B) mechanically flattening and polishing said zinc particles while contained in said medium, thereby preparing a dispersion of flaked metal particles in said medium; (C) admixing the zinc flake dispersion with a hexavalent-chromium-containing substance and water in an amount sufficient to obtain a coating composition containing: (1) between about 50 and about 500 grams per liter of flaked zinc particles; and (2) above 15 but below about 50 volume percent of organic substance, basis the total volume of the composition liquid medium; and sufficient hexavalent-chromium-containing substance to supply said composition with a weight ratio of chromium, expressed as CrO 3 , to flaked zinc particles of between about 1:1 and 1:15; and, (D) mixing and blending said ingredients to obtain said zinc flake and hexavalent chromium-containing coating composition.
Claim 2
Dependent Claim
214 words
A process for making a zinc flake and hexavalent chrome-containing coating composition for providing an adherent and corrosion-resistant coating on a metal substrate, wherein the medium of said coating composition is supplied by water plus organic substance, which process comprises: (A) combining finely divided non-flaked zinc metal with a flaking medium liquid organic substance selected from the group consisting of diacetone alcohol, 2-ethoxyethanol and 2-butoxyethanol in an amount sufficient to provide a weight ratio of zinc metal to said substance of between about 3:1 and 1:3; (B) mechanically flattening and polishing said zinc particles while contained in said medium, thereby preparing a dispersion of flaked metal particles in said medium; (C) admixing the zinc flake dispersion with a hexavalent-chromium-containing substance and water in an amount sufficient to obtain a coating composition containing: (1) between about 50 and about 500 grams per liter of flaked zinc particles; and (2) above 15 but below about 50 volume percent of organic substance, basis the total volume of the composition liquid medium; and sufficient hexavalent-chromium-containing substance to supply said composition with a weight ratio of chromium, expressed as CrO 3 , to flaked zinc particles of between about 1:1 and 1:15; and, (D) mixing and blending said ingredients to obtain said zinc flake and hexavalent chromium-containing coating composition.
Claim 3
Dependent Claim
57 words
The process of claim 1 which further includes admixing an additional organic substance selected from the group consisting of additional said flaking medium liquid organic substance, tri-, and tetraethylene glycols, di-, and tripropylene glycol, the water soluble low molecular weight ethers of said glycols, the water soluble low molecular weight ethers of diethylene glycol, and mixtures thereof.
Claim 4
Dependent Claim
35 words
The process of claim 1 further characterized by separating a portion of the flaking medium organic substance from said dispersion of step (B) to form a concentrated zinc flake dispersion for admixing in step (C).
Claim 5
Dependent Claim
25 words
The process of claim 3 wherein said separation includes filtration, and said concentrated dispersion contains at least about ten weight percent of said organic substance.
Claim 6
Dependent Claim
22 words
The process of claim 1 which further includes adding a leafing agent and weldment inhibitor to the flaking medium of step (A).
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein said leafing agent is stearic acid.
Claim 8
Dependent Claim
14 words
The process of claim 5 wherein said weldment inhibitor is finely divided aluminum metal.
References Cited (Backward Citations)
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US2312088A
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US2432465A
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US3671331A
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |