Patent US4533448A successfully refreshed from Google Patents.
US4533448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amine-free and surfactant-free electrodeposition of polyesters, polyamic acids, polyimides, and polyamide-imides
Assignee: Westinghouse Electric Corp
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Filing: 1982-02-19
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Granted: 1985-08-06
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Expires: 2002-02-19
Abstract
Abstract Disclosed is an electrodepositable emulsion which comprises a soluble un-ionized polymer containing an amic acid or amide linking group, a non-electrolyzable organic solvent for the polymer and a non-electrolyzable organic non-solvent for the polymer. The weight ratio of the solvent to the non-solvent is about 0.1 to about 0.5 and the polymer is about 0.4 to about 5% by weight of the weight of the solvent. No amine or surface active agent is used. A workpiece is coated with the polymer by placing it into the emulsion about one-half to about two inches away from the cathode. Constant dc voltage is applied between the cathode and the workpiece until a coating of a desired thickness has been deposited on the workpiece. The workpiece is then removed, dried, and cured.
Inventors
- 👤 Luciano C. Scala
- 👤 William M. Alvino
- 👤 Timothy J. Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:23
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08L; C08L79/00; C08L79/04; C08L79/08; C09; C09D; C09D5/00; C09D5/44; C09D5/4419; C08J2377/00; Y; Y10; Y10S; Y10S524/00; Y10S524/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A method of electrodepositing polyamic acids on a workpiece comprising (A) preparing an emulsion which comprises (1) a soluble un-ionized polymer containing a linking group selected from the group consisting of amic acid, amide, imide, and mixtures thereof; (2) a non-electrolyzable organic solvent for said polymer which forms the discontinuous phase of said emulsion; and (3) a non-electrolyzable organic non-solvent for said polymer which forms the continuous phase of said emulsion, where the weight ratio of said solvent to said non-solvent is about 0.1 to about 0.5, and said polymer is about 0.4 to about 5% by weight of the weight of said solvent; (B) placing said workpiece into said emulsion about one-half to about two inches away from a cathode; (C) passing direct current between said cathode and said workpiece, with said workpiece as the anode, until a coating of the desired thickness has been deposited onto said workpiece; (D) removing said workpiece from said composition; (E) drying said coating; and (F) curing said coating.
Claim 2
Independent Claim
166 words
A method of electrodepositing polyamic acids on a workpiece comprising (A) preparing an emulsion which comprises (1) a soluble un-ionized polymer containing a linking group selected from the group consisting of amic acid, amide, imide, and mixtures thereof; (2) a non-electrolyzable organic solvent for said polymer which forms the discontinuous phase of said emulsion; and (3) a non-electrolyzable organic non-solvent for said polymer which forms the continuous phase of said emulsion, where the weight ratio of said solvent to said non-solvent is about 0.1 to about 0.5, and said polymer is about 0.4 to about 5% by weight of the weight of said solvent; (B) placing said workpiece into said emulsion about one-half to about two inches away from a cathode; (C) passing direct current between said cathode and said workpiece, with said workpiece as the anode, until a coating of the desired thickness has been deposited onto said workpiece; (D) removing said workpiece from said composition; (E) drying said coating; and (F) curing said coating.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein said electrodeposition is performed at about 10° to about 25° C.
Claim 4
Dependent Claim
14 words
A method according to claim 1 wherein said workpiece is a continuously moving wire.
Claim 5
Dependent Claim
22 words
A method according to claim 1 wherein said direct current is at a constant voltage of about 10 to about 300 volts.
Claim 6
Dependent Claim
30 words
A method according to claim 1 wherein said coating is cured in incremental temperature steps of about 5° C. per hour for about 40° C. up to about 300° C.
Claim 7
Dependent Claim
12 words
A method according to claim 1 wherein said workpiece is gallium arsenide.
Claim 8
Dependent Claim
12 words
A method according to claim 1 wherein said workpiece is a metal.
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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |