Patent US4099989A successfully refreshed from Google Patents.
US4099989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective coating for aluminum products
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1976-07-27
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Granted: 1978-07-11
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Expires: 1996-07-27
Abstract
Abstract This invention relates to the formation of a hydrophobic and usually oleophilic coating on an aluminum surface by mechanically deforming or upsetting the aluminum surface to disrupt the natural oxide coating in the presence of alkaline agents and a long chain aliphatic carboxylic acid or other equivalent long chain aliphatic carboxylate compounds. Preferably, the carboxylic acid and alkaline agent are incorporated into a metal-working lubricant which is maintained on the aluminum surface during fabrication, such as rolling, so that the hydrophobic coating is formed simultaneously with fabrication and thereby avoid the necessity of a separate coating operation.
Inventors
- 👤 Geoffrey A. Dorsey, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:33
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/66; C23C22/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A method of forming a tenacious, hydrophobic coating on an aluminum surface which is resistant to polar organic solvents consisting essentially of: (a) mechanically disrupting the natural oxide coating on the aluminum surface to generate a fresh aluminum surface, and (b) maintaining on the aluminum surface during said disruption an alkaline liquid selected from the group consisting of nonaqueous liquids and aqueous liquids having a pH of less than 10, said liquid having dissolved therein an effective amount of an aliphatic carboxylic acid or an equivalent carboxylate compound having from 12-22 carbon atoms so that upon generation of a fresh aluminum surface by said disruption a tenacious hydrophobic coating is formed.
Claim 2
Independent Claim
111 words
A method of forming a tenacious, hydrophobic coating on an aluminum surface which is resistant to polar organic solvents consisting essentially of: (a) mechanically disrupting the natural oxide coating on the aluminum surface to generate a fresh aluminum surface, and (b) maintaining on the aluminum surface during said disruption an alkaline liquid selected from the group consisting of nonaqueous liquids and aqueous liquids having a pH of less than 10, said liquid having dissolved therein an effective amount of an aliphatic carboxylic acid or an equivalent carboxylate compound having from 12-22 carbon atoms so that upon generation of a fresh aluminum surface by said disruption a tenacious hydrophobic coating is formed.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the natural oxide coating is disrupted by rolling.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the natural oxide coating is disrupted by forging.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein the natural oxide coating is disrupted by abrading the surface.
Claim 6
Dependent Claim
37 words
The method of claim 1 wherein the carboxylic acid or an equivalent carboxylate compound is incorporated into a lubricant which is applied to the aluminum surface prior to the deformation thereof to disrupt the natural oxide coating.
Claim 7
Dependent Claim
23 words
The method of claim 5 wherein the lubricant is an oil-based lubricant containing a base hydrocarbon oil and at least one lubricity agent.
Claim 8
Dependent Claim
48 words
The method of claim 6 wherein an alkaline compound selected from the group consisting of sodium hydroxide and potassium hydroxide is incorporated into the lubricant by dissolving the alkaline compound in a liquid which is soluble in the lubricant and then adding the thus-formed solution to the lubricant.
Claim 9
Dependent Claim
31 words
The method of claim 5 wherein the lubricant is an oil-in-water emulsion and wherein the oil phase of the emulsion contains at least one lubricity agent and a hydrocarbon base oil.
Claim 10
Dependent Claim
19 words
The method of claim 8 wherein the aqueous phase of the emulsion has a pH between 7.5 and 10.
Claim 11
Dependent Claim
33 words
The method of claim 9 wherein the pH of the aqueous phase is developed and maintained by additions of an alkaline compound selected from the group consisting of sodium hydroxide and potassium hydroxide.
Claim 12
Dependent Claim
21 words
The method of claim 1 wherein the carboxylic acid is selected from the group consisting of stearic acid and isostearic acid.
References Cited (Backward Citations)
US2413220A
Cited
US3105400A
Cited
US2963391A
Cited
US3098294A
Cited
US3836467A
Cited
US3923671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |