Patent US2483427A successfully refreshed from Google Patents.
US4101346A
Expired / Lapsed
US
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Protective hydrophobic and oleophilic coating for aluminum products
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1976-07-27
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Granted: 1978-07-18
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Expires: 1996-07-27
Abstract
Abstract This invention is directed to a process for forming a hydrophobic and highly oleophilic coating on an aluminum surface which comprises treating the aluminum surface under aqueous alkaline conditions with a long chain aliphatic carboxylic acid (or an equivalent carboxylate compound), such as isostearic acid, which has one or more short secondary alkyl groups on or near the nonpolar end of the carboxylate compound. The coating can be formed by treating the surface with an aqueous alkaline solution which contains the carboxylic acid or the coating can be formed by mechanically deforming or upsetting the aluminum surface to expose a fresh aluminum surface to a carboxylic acid (or its equivalent) and a compound which generates alkaline conditions on the aluminum surface. In the latter instance, the carboxylic acid and alkaline compound is preferably incorporated into a metal-working lubricant used to facilitate deformation.
Inventors
- 👤 Geoffrey A. Dorsey, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:45
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/66; C23C22/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
80 words
A method of preparing a hydrophobic and oleophilic protective coating on an aluminum workpiece consisting essentially of developing a fresh aluminum surface on said workpiece and then treating the fresh aluminum surface under alkaline conditions with a liquid selected from the group consisting of nonaqueous liquids and aqueous liquids with a pH less than 10, said liquids containing an effective amount of a branched chain aliphatic carboxylic acid or an equivalent carboxylate compound having from 12 to 22 carbon atoms.
Claim 2
Independent Claim
80 words
A method of preparing a hydrophobic and oleophilic protective coating on an aluminum workpiece consisting essentially of developing a fresh aluminum surface on said workpiece and then treating the fresh aluminum surface under alkaline conditions with a liquid selected from the group consisting of nonaqueous liquids and aqueous liquids with a pH less than 10, said liquids containing an effective amount of a branched chain aliphatic carboxylic acid or an equivalent carboxylate compound having from 12 to 22 carbon atoms.
Claim 3
Dependent Claim
50 words
The method of claim 1 wherein the natural oxide coating on the aluminum surface is mechanically removed or disrupted so as to expose a fresh aluminum surface and then the fresh aluminum surface is treated under alkaline conditions with the branched chain aliphatic carboxylic acid or an equivalent carboxylate compound.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein the aluminum surface is mechanically removed or disrupted by rolling.
Claim 5
Dependent Claim
16 words
The method of claim 2 wherein the aluminum surface is mechanically removed or disrupted by abrading.
Claim 6
Dependent Claim
38 words
The method of claim 1 wherein the branched aliphatic chain on the aliphatic carboxylic acid contains from 1-3 carbon atoms and is located at or near the nonpolar end of the carboxylic acid or an equivalent carboxylate compound.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein the carboxylic acid is isostearic acid.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein the compound which generates the alkaline conditions is selected from the group consisting of sodium and potassium hydroxide.
Claim 9
Independent Claim
64 words
A method of forming a hydrophobic and oleophilic protective coating on an aluminum workpiece consisting essentially of developing a fresh aluminum surface on said workpiece and then treating the fresh aluminum surface with an aqueous alkaline solution at a pH less than 10 containing an effective amount of a branched chain aliphatic carboxylic acid or an equivalent carboxylic compound having from 12-22 carbon atoms.
Claim 10
Independent Claim
64 words
A method of forming a hydrophobic and oleophilic protective coating on an aluminum workpiece consisting essentially of developing a fresh aluminum surface on said workpiece and then treating the fresh aluminum surface with an aqueous alkaline solution at a pH less than 10 containing an effective amount of a branched chain aliphatic carboxylic acid or an equivalent carboxylic compound having from 12-22 carbon atoms.
Claim 11
Dependent Claim
18 words
The method of claim 8 wherein the pH of the aqueous solution is between about 7.5 and 10.
Claim 12
Dependent Claim
18 words
The method of claim 8 wherein the pH of the aqueous solution is between about 8.5 and 10.
Claim 13
Dependent Claim
24 words
The method of claim 8 wherein the temperature at the interface between the aluminum surface and the treating solution is greater than 60° C.
Claim 14
Dependent Claim
21 words
The method of claim 8 wherein the aluminum surface is treated with the aqueous alkaline solution for at least 0.1 second.
Claim 15
Dependent Claim
28 words
The method of claim 8 wherein the aqueous alkaline solution contains at least one part (by weight) per million of the carboxylic acid or an equivalent carboxylic compound.
Claim 16
Dependent Claim
26 words
The method of claim 8 wherein the aqueous alkaline solution contains from about 0.01 to 10 grams/liter of the carboxylic acid or an equivalent carboxylate compound.
Claim 17
Dependent Claim
38 words
The method of claim 8 wherein the branched aliphatic chain on the aliphatic carboxylic acid contains from 1-3 carbon atoms and is located at or near the nonpolar end of the carboxylic acid or an equivalent carboxylate compound.
Claim 18
Dependent Claim
30 words
The method of claim 8 wherein the temperature at the interface between the aluminum surface and treating solution is between about 75° C and the boiling point of the solution.
Claim 19
Dependent Claim
12 words
The method of claim 8 wherein the carboxylic acid is isostearic acid.
Claim 20
Dependent Claim
24 words
The method of claim 8 wherein the compound which generates the alkaline conditions is selected from the group consisting of sodium and potassium hydroxide.
Claim 21
Dependent Claim
21 words
The method of claim 8 wherein the aluminum surface is treated with the aqueous alkaline solution for at least one second.
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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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |