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US3663401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of water-soluble acids in an electrodeposition bath
Assignee: PPG Industries Inc
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Filing: 1970-10-13
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Granted: 1972-05-16
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Expires: 1990-10-13
Abstract
Abstract This invention relates to a method of controlling water-soluble acids present in a base-solubilized electrodepositable composition, which comprises subjecting the bath to a selective filtration process such as ultrafiltration and thereby removing water-soluble acids from the bath.
Inventors
- 👤 Roger M Christenson
- 👤 Louis R Lebras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:29
CPC Classifications
C; C25; C25D; C25D13/00; C25D13/22; C25D13/24
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
67 words
In a method of operating a continuous electrocoating operation wherein electrically-conductive objects are provided with an organic coating by electrically-induced deposition of organic coating material in which said objects are passed through an aqueous dispersion of said coating material retained in a coating bath, the improvement comprising employing as at least a portion of said aqueous dispersion an aqueous dispersion treated by the method of claim 1.
Claim 2
Dependent Claim
42 words
A method as in claim 1 wherein the ultrafiltration process is operated at a pressure gradient between about 10 and about 150 p.s.i. and the ultrafiltration membrane has a flux rate of at least about 4.5 gallons per square foot per day.
Claim 3
Dependent Claim
18 words
A method as in claim 1 wherein the water-soluble acid salt removed is a salt of formic acid.
Claim 4
Dependent Claim
67 words
In a method of operating a continuous electrocoating operation wherein electrically-conductive objects are provided with an organic coating by electrically-induced deposition of organic coating material in which said objects are passed through an aqueous dispersion of said coating material retained in a coating bath, the improvement comprising employing as at least a portion of said aqueous dispersion an aqueous dispersion treated by the method of claim 4.
Claim 5
Dependent Claim
15 words
A method as in claim 1 wherein the polyacid resin is a carboxylic acid resin.
Claim 6
Dependent Claim
17 words
A method as in claim 6 wherein the electrodeposition bath has been previously utilized to electrocoat articles.
Claim 7
Dependent Claim
42 words
A method as in claim 7 wherein the ultrafiltration process is operated at a pressure gradient between about 10 and about 150 p.s.i. and the ultrafiltration membrane has a flux rate of at least about 4.5 gallons per square foot per day.
Claim 8
Dependent Claim
14 words
A method as in claim 8 wherein the ultrafiltration membrane is an anisotropic membrane.
Claim 9
Dependent Claim
18 words
A method as in claim 8 wherein the water-soluble acid salt removed is a salt of formIc acid.
Claim 10
Dependent Claim
67 words
In a method of operating a continuous electrocoating operation wherein electrically-conductive objects are provided with an organic coating by electrically-induced deposition of organic coating material in which said objects are passed through an aqueous dispersion of said coating material retained in a coating bath, the improvement comprising employing as at least a portion of said aqueous dispersion an aqueous dispersion treated by the method of claim 10.
Claim 11
Dependent Claim
14 words
A method as in claim 1 wherein the electrodeposition bath contains an aldehyde-derived resin.
Claim 12
Dependent Claim
42 words
A method as in claim 12 wherein the ultrafiltration process is operated at a pressure gradient between about 10 and about 150 p.s.i. and the ultrafiltration membrane has a flux rate of at least about 4.5 gallons per square foot per day.
Claim 13
Dependent Claim
67 words
In a method of operating a continuous electrocoating operation wherein electrically-conductive objects are provided with an organic coating by electrically-induced deposition of organic coating material in which said objects are passed through an aqueous dispersion of said coating material retained in a coating bath, the improvement comprising employing as at least a portion of said aqueous dispersion an aqueous dispersion treated by the method of claim 12.
Claim 14
Dependent Claim
15 words
A method as in claim 12 wherein the polyacid resin is a carboxylic acid resin.
Claim 15
Dependent Claim
67 words
In a method of operating a continuous electrocoating operation wherein electrically-conductive objects are provided with an organic coating by electrically-induced deposition of organic coating material in which said objects are passed through an aqueous dispersion of said coating material retained in a coating bath, the improvement comprising employing as at least a portion of said aqueous dispersion an aqueous dispersion treated by the method of claim 15.
Claim 16
Dependent Claim
14 words
A method as in claim 15 wherein the ultrafiltration membrane is an anisotropic membrane.
Claim 17
Dependent Claim
17 words
A method as in claim 15 wherein the electrodeposition bath has been previously utilized to electrocoat articles.
Claim 18
Dependent Claim
42 words
A method as in claim 18 wherein the ultrafiltration process is operated at a pressure gradient between about 10 and about 150 p.s.i. and the ultrafiltration membrane has a flux rate of at least about 4.5 gallons per square foot per day.
Claim 19
Dependent Claim
18 words
A method as in claim 19 wherein the water-soluble acid salt removed is a salt of formic acid.
Claim 20
Dependent Claim
67 words
In a method of operating a continuous electrocoating operation wherein electrically-conductive objects are provided with an organic coating by electrically-induced deposition of organic coating material in which said objects are passed through an aqueous dispersion of said coating material retained in a coating bath, the improvement comprising employing as at least a portion of said aqueous dispersion an aqueous dispersion treated by the method of claim 20.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |