US4752365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of application for conductive primers
Assignee: W C RICHARDS COMPANY A ILLINOIS CORP OF ILLINOIS
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Filing: 1987-01-12
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Granted: 1988-06-21
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Expires: 2007-01-12
Abstract
Abstract The present invention is directed to improved methods for increasing the effective contact area of electrodes during the electrocoating process. One preferred embodiment of such methods comprises the first step of coating a non-conductive workpiece with a conductive primer. Next, the areas surrounding the respective contact areas for the electrocoat electrodes are coated with a contact area coating composition having greater electroconductivity then that of the conductive primer. Next, the coating electrodes are fixed on the contact areas for electrocoating. The workpiece is then submerged into an electrocoating bath, and finally sufficient electrical change is applied to the prepared workpiece to electrocoat the workpiece. Compositions having such greater electroconductivity and which are suitable for use in the improved methods of the present invention comprise a substantially uniform dispersion of approximately 5% to 10% by weight of a polymeric binder, approximately 40% to 50% by weight of a metallic powder, approximately 38.5% to 54.5% by weight of a compatible solvent, and approximately 0.5 percent to 1.5 percent by weight of modifying agents.
Inventors
- 👤 Salvador R. Lo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:33
CPC Classifications
C; C25; C25D; C25D13/00; C25D13/22; Y; Y10; Y10S; Y10S524/00; Y10S524/901
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
87 words
An improved method for increasing the effective contact area of electrodes during electrocoating, comprising the steps of: coating a non-conductive workpiece with a conductive primer; coating the area surrounding the respective contact areas for the electrocoat electrodes with a contact area coating composition having greater conductivity than that of the conductive primer; fixing the electrocoating electrodes to said contact areas for electrocoating; submerging the workpiece into an electrocoat bath; and applying sufficient electrical charge to the conductive primed and contact area coated workpiece to electrocoat said workpiece.
Claim 2
Dependent Claim
87 words
An improved method for increasing the effective contact area of electrodes during electrocoating, comprising the steps of: coating a non-conductive workpiece with a conductive primer; coating the area surrounding the respective contact areas for the electrocoat electrodes with a contact area coating composition having greater conductivity than that of the conductive primer; fixing the electrocoating electrodes to said contact areas for electrocoating; submerging the workpiece into an electrocoat bath; and applying sufficient electrical charge to the conductive primed and contact area coated workpiece to electrocoat said workpiece.
Claim 3
Dependent Claim
45 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 1 wherein the area surrounding the respective contact areas for the electrodes is coated with said contact area coating composition by spraying said contact area coating composition thereonto.
Claim 4
Dependent Claim
45 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 1 wherein the area surrounding the respective contact areas for the electrodes is coated with said contact area coating composition by painting said contact area coating composition thereonto.
Claim 5
Dependent Claim
72 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 1 wherein said contact area coating composition comprises a grind of substantially uniform dispersion of: approximately 5% to 10% by weight of a polymeric binder; approximately 40% to 50% by weight of a metallic powder; approximately 38.5% to 54.5% by weight of a compatible solvent; and approximately 0.5% to 1.5% by weight of modifying agents.
Claim 6
Dependent Claim
27 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein the polymeric binder comprises a polyester melamine binder.
Claim 7
Dependent Claim
27 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 5 wherein the polymeric binder further comprises an epoxy resin.
Claim 8
Dependent Claim
38 words
The improved method for increasing the effective contact area of electrodes during electro-coating as claimed in claim 6 wherein the epoxy resin is present in an amount of approximately 1% by weight of the contact area coating composition.
Claim 9
Dependent Claim
28 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 5 wherein said polymeric binder further comprises an alkylated amino resin.
Claim 10
Dependent Claim
39 words
The improved method for increasing the effective contact area of electrodes during electro-coating as claimed in claim 8 wherein said alkylated amino resin is present in an amount of approximately 5.7% by weight of the contact area coating composition.
Claim 11
Dependent Claim
25 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein the metallic powder comprises nickel flake.
Claim 12
Dependent Claim
35 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein the metallic powder is selected from the group consisting of finely divided nickel, copper, and silver.
Claim 13
Dependent Claim
25 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein the compatible solvent comprises isobutyl alcohol.
Claim 14
Dependent Claim
25 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein the compatible solvent comprises diacetone alcohol.
Claim 15
Dependent Claim
25 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein the compatible solvent comprises ethyl 3-ethoxypropionate.
Claim 16
Dependent Claim
28 words
The improved method for increasing the effective contact area of electrodes during electro-coating as claimed in claim 4 wherein said contact area composition further comprises a thickening agent.
Claim 17
Dependent Claim
27 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 15 wherein the said thickening agent comprises ethyl hydroxyethyl cellulose.
Claim 18
Dependent Claim
39 words
The improved method for increasing the effective contact area of electrodes during electro-coating as claimed in claim 16 wherein the ethyl hydroxyethyl cellulose is present in an amount comprising approximately 0.8% by weight of the contact area coating composition.
Claim 19
Dependent Claim
29 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein said contact area coating composition further comprising an acid catalyst.
Claim 20
Dependent Claim
27 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 18 wherein the acid catalyst comprises an aromatic sulfonic acid.
Claim 21
Dependent Claim
27 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 19 wherein the aromatic sulfonic acid comprises dinonylnaphthalene disulfonic acid.
Claim 22
Dependent Claim
27 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein said modifying agents comprise at least one surfactant.
Claim 23
Dependent Claim
26 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein the modifying agents comprise an organo-titanium salt.
Claim 24
Dependent Claim
33 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 22 wherein the organo titanium salt comprises titanium IV bis (dioctyl) pyrophosphato-O ethylene diolato (adduct) triethylamine.
Claim 25
Dependent Claim
38 words
The improved method for increasing the effective contact area of electrodes during electro-coating as claimed in claim 22 wherein the organo-titanium salt is present in an amount of approximately 0.05% by weight of the contact area coating composition.
Claim 26
Dependent Claim
25 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein the modifying agents comprise a drier.
Claim 27
Dependent Claim
25 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 25 wherein the drier comprises 16% zinc drier.
Claim 28
Dependent Claim
38 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 26 wherein the 16% zinc drier is present in an amount of 0.4% by weight of the contact area coating composition.
Claim 29
Dependent Claim
32 words
The improved method for increasing the effective contact area of electrodes during electrocoating as claimed in claim 4 wherein the metal powder is incorporated into said substantially uniform dispersion in the grind.
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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |