US4181773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for rendering surfaces permanently water wettable and novel products thus-produced
Assignee: General Electric Co
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Filing: 1978-03-29
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Granted: 1980-01-01
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Expires: 1998-03-29
Abstract
Abstract The surfaces of articles of manufacture fabricated from aluminum and other materials which are not permanently water wettable are rendered permanently water wettable by coating the surface with a continuous film containing colloidal alumina of a water soluble form of basic film forming polymer which is curable to water insolubility; curing the polymer to water insolubility; and hydrolyzing the surface portion only of the cured polymer.
Inventors
- 👤 Milton E. Rickert, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:46
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B05D5/00; B05D5/04; C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D5/00; C09D5/44; C09D5/4407; C09D5/4411; F; F24; F24F; F24F6/00; F24F6/02; F24F6/04; F25; F25B; F25B39/00; F25B39/02; B05D2202/00; B05D2202/20; B05D2202/25; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31511; Y10T428/31529; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
85 words
A process for rendering permanently water wettable a surface of an article of manufacture which is not permanently water wettable, which comprises the steps of: (a) coating the surface with a continuous film, containing colloidal alumina, of a water soluble form of a film forming basic polymer which is curable to water insolubility; (b) curing the coated polymer on the substrate surface to water insolubility; and (c) thereafter rendering the cured coating water wettable by hydrolyzing substantially only the surface portion of the cured polymer.
Claim 2
Dependent Claim
85 words
A process for rendering permanently water wettable a surface of an article of manufacture which is not permanently water wettable, which comprises the steps of: (a) coating the surface with a continuous film, containing colloidal alumina, of a water soluble form of a film forming basic polymer which is curable to water insolubility; (b) curing the coated polymer on the substrate surface to water insolubility; and (c) thereafter rendering the cured coating water wettable by hydrolyzing substantially only the surface portion of the cured polymer.
Claim 3
Dependent Claim
10 words
The process of claim 1, wherein the surface is metal.
Claim 4
Dependent Claim
10 words
The process of claim 2, wherein the metal is aluminum.
Claim 5
Dependent Claim
14 words
The process of claim 3, wherein the article of manufacture is a refrigerator evaporator.
Claim 6
Dependent Claim
33 words
A process of claim 1 wherein the polymer and colloidal alumina are applied to the surface from an aqueous solution of an acid salt of the polymer containing the colloidal alumina dispersed therein.
Claim 7
Dependent Claim
19 words
The process of claim 1, wherein the acid salt of the polymer is a salt of an organic acid.
Claim 8
Dependent Claim
14 words
The process of claim 1, wherein the organic acid is acetic or formic acid.
Claim 9
Dependent Claim
16 words
The process of claim 1, wherein the polymer is an epoxy resin containing an amine functionality.
Claim 10
Dependent Claim
22 words
The process of claim 1, wherein in step (c) the polymer is hydrolyzed with water at a pH of 7 or less.
Claim 11
Dependent Claim
21 words
The process of claim 1, wherein the polymer coating has a thickness of about 3×10 -3 to about 40×10 -3 mm.
Claim 12
Dependent Claim
55 words
The process of claim 1, wherein the surface is aluminum, wherein in step (a) the coating of the basic polymer is applied to the surface of the substrate from an aqueous solution of an organic acid salt thereof containing the colloidal alumina dispersed therein and wherein in step (b) the polymer is cured by heating.
Claim 13
Dependent Claim
27 words
The process of claim 11, wherein in step (a) the surface is coated with the polymer by dipping the substrate in the aqueous solution of the polymer.
Claim 14
Dependent Claim
14 words
The process of claim 11, wherein the organic acid is acetic or formic acid.
Claim 15
Dependent Claim
21 words
The process of claim 11, wherein the polymer coating has a thickness of about 3×10 -3 to about 40×10 -3 mm.
Claim 16
Dependent Claim
42 words
The process of claim 14, wherein the article of manufacture is a refrigerator evaporator, wherein in step (a) the surface is coated with the polymer by dipping the evaporator in the aqueous solution of an acetic or formic salt of the polymer.
Claim 17
Dependent Claim
41 words
An article of manufacture formed of aluminum presenting a surface rendered permanently water wettable by a water-insoluble coating thereon of a water-soluble basic polymer which has been cured to water-insolubility and rendered water wettable according to the process of claim 3.
Claim 18
Dependent Claim
16 words
An aluminum article of manufacture according to claim 16, wherein the polymer contains pendant amine groups.
Claim 19
Dependent Claim
8 words
An aluminum refrigerator evaporator according to claim 17.
Claim 20
Dependent Claim
39 words
A metal article of manufacture presenting a surface rendered permanently water wettable by a water-insoluble coating thereon of a water-soluble basic polymer which has been cured to water-insolubility and rendered water wettable according to the process of claim 2.
References Cited (Backward Citations)
US3468753A
Cited
US4037018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |