US3663402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pretreating electrodepositable compositions
Assignee: PPG Industries Inc
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Filing: 1970-11-12
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Granted: 1972-05-16
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Expires: 1990-11-12
Abstract
Abstract A method of pretreating electrodepositable compositions prior to utilization of such compositions, in an electrodeposition process, which comprises subjecting a synthetic resin ionically solubilized in an aqueous medium to a selective separation process such as ultrafiltration which passes an aqueous effluent through a physical barrier while retaining the solubilized resin component. The method enables the removal of deleterious impurities and contaminants which affect coating parameters and thus provides a direct method of controlling the quality of the deposited film.
Inventors
- 👤 Roger M Christenson
- 👤 Robert R Zwack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:52
CPC Classifications
C; C25; C25D; C25D13/00; C25D13/22; C25D13/24
Claims Analysis
Total Claims: 7
Claim 1
Independent 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 psi and the ultrafiltration membrane has a flux rate of at least about 4.5 gallons per square foot per day.
Claim 2
Dependent Claim
17 words
A method as in claim 1 wherein said vehicle resin component comprises an ionically solubilized synthetic resin.
Claim 3
Dependent Claim
19 words
A method as in cLaim 3 wherein said synthetic resin is a polycarboxylic acid resin solubilized with a base.
Claim 4
Dependent Claim
13 words
A method as in claim 4 wherein the base is a water-soluble amine.
Claim 5
Dependent Claim
14 words
A method as in claim 4 wherein the base is an alkali metal hydroxide.
Claim 6
Dependent Claim
18 words
A method as in claim 3 wherein said synthetic resin comprises a polybasic resin solubilized with an acid.
Claim 7
Dependent Claim
21 words
A method as in claim 1 wherein the feed composition is diluted with water before being subjected to the ultrafiltration process.
References Cited (Backward Citations)
GB1071458A
Cited
US3526588A
Cited
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 |