US3869366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for electrocoating
Assignee: Shinto Paint Co Ltd
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Filing: 1972-09-29
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Granted: 1975-03-04
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Expires: 1992-09-29
Abstract
Abstract A method of electrocoating is provided which comprises immersing an electrically conductive metallic article as a cathode in an aqueous electrodeposition bath containing a cationic binder resin and a non-ionic synthetic resin powder dispersed therein, the amount of the latter being 100 - 5000 parts by weight per 100 parts of the former, applying a voltage between said cathodic article and an anode to cause electric current flow through said bath so that a resinous coating comprising said binder resin and non-ionic resin powder is electrodeposited on the cathodic article, taking the coated article out of the bath and baking the same to form an adherent resinous film on said article.
Inventors
- 👤 Tameyuki Suzuki
- 👤 Junichi Yasukawa
- 👤 Teruhiko Ishii
- 👤 Giiichi Minami
- 👤 Yukihiro Manabe
- 👤 Mitsuo Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:18
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4473; Y; Y10; Y10S; Y10S524/00; Y10S524/901
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A METHOD OF ELECTROCOATING WHICH COMPRISES IMMERSING AN ELECTRICALLY CONDUCTIVE METALLIC ARTICLE AS A CATHODE IN AN AQUEOUS ELECTRODEPOSITION BATH CONTAINING A CATIONIC BINDER RESIN AND A NON-IONIC SYNETHIC RESIN POWDER DISPERSED THEREIN, THE AMOUNT OF THE LATTER BEING 100-500 PARTS BY WEIGHT PER 100 PARTS OF THE FORMER, APPLYING A VOLTAGE BETWEEN SAID CATHODIC ARTICLE AND AN ANODE TO CAUSE ELECTRIC CURRENT FLOW THROUGH SAID BATH SO THAT A RESINOUS COATING COMPRISING SAID BINDER RESIN AND NON-IONIC RESIN POWDER IS ELECTRODEPOSITED ON THE CATHODIC ARTICLE, TAKING THE COATED ARTICLE OUT OF THE BATH AND BAKING THE SAME TO FORM AN ADHERENT RESINOUS FILM ON SAID ARTICLE.
Claim 2
Independent Claim
107 words
A METHOD OF ELECTROCOATING WHICH COMPRISES IMMERSING AN ELECTRICALLY CONDUCTIVE METALLIC ARTICLE AS A CATHODE IN AN AQUEOUS ELECTRODEPOSITION BATH CONTAINING A CATIONIC BINDER RESIN AND A NON-IONIC SYNETHIC RESIN POWDER DISPERSED THEREIN, THE AMOUNT OF THE LATTER BEING 100-500 PARTS BY WEIGHT PER 100 PARTS OF THE FORMER, APPLYING A VOLTAGE BETWEEN SAID CATHODIC ARTICLE AND AN ANODE TO CAUSE ELECTRIC CURRENT FLOW THROUGH SAID BATH SO THAT A RESINOUS COATING COMPRISING SAID BINDER RESIN AND NON-IONIC RESIN POWDER IS ELECTRODEPOSITED ON THE CATHODIC ARTICLE, TAKING THE COATED ARTICLE OUT OF THE BATH AND BAKING THE SAME TO FORM AN ADHERENT RESINOUS FILM ON SAID ARTICLE.
Claim 3
Dependent Claim
34 words
A method as claimed in claim 1 wherein the bath further contains up to 30 parts by weight per 100 parts of the total resinous material in the bath of pigment powder dispersed therein.
Claim 4
Dependent Claim
31 words
A method as claimed in claim 1 wherein the amount of the non-ionic synthetic resin powder is 100 - 1000 parts by weight per 100 parts of the cationic binder resin.
Claim 5
Dependent Claim
59 words
A method as claimed in claim 1 wherein the cationic binder resin is water-thinnable or water-soluble and prepared by the at least partial neutralization of a basic resin containing nitrogen atoms in the molecule with an acid compound or a compound which is capable of producing an acid compound when reacted with the basic nitrogens in said basic resin.
Claim 6
Dependent Claim
38 words
A method as claimed in claim 4, in which said basic resin having nitrogen atoms in the molecule is selected from the group consisting of aminoepoxy resins, urethane modified aminoepoxy resins, aminoacrylic resins, aminovinyl resins and polyamide resins.
Claim 7
Dependent Claim
44 words
A method as claimed in claim 4, in which said acid compound in selected from the group consisting of inorganic acids and organic acids, preferably hydrochloric acid, phosphoric acid, formic acid, acetic acid, propionic acid, citric acid, malic acid, tartaric acid and arylic acid.
Claim 8
Dependent Claim
50 words
A method as claimed in claim 4, in which the quantity of said acid compound to be used for the neutralization of the basic resin is from 0.2 to 3.0 equivalents, preferably 0.5 to 1.5 equivalents per one equivalent of the amino groups or basic nitrogens in said basic resin.
Claim 9
Dependent Claim
62 words
A method as claimed in claim 4, in which the compound which is capable of producing an acid compound when reacted with the amino groups or basic nitrogens in said basic resin is selected from epihalohydrins, and the quantity of the same is from 0.5 to 2.0 equivalents per one equivalent of the amino groups or basic nitrogens in said basic resin.
Claim 10
Dependent Claim
40 words
A method as claimed in claim 1 wherein the non-ionic synthetic resin powder is one which is solid at the room temperature or can melt in the baking step and has an average particle size from 0.5 to 100 microns.
Claim 11
Dependent Claim
35 words
A method as claimed in claim 1 wherein the non-ionic synthetic resin is selected from the group consisting of epoxy resins, polyester resins, acrylic resins, polyurethane resins, polyamide resins, polyolefin resins and cellulose derivative resins.
Claim 12
Dependent Claim
24 words
A method as claimed in claim 1 wherein the solid content of the bath is 5 - 30 %, preferably 10 - 20 %.
Claim 13
Dependent Claim
40 words
A method as claimed in claim 1 wherein the voltage to be applied is 20 - 600 V., preferably 50 - 400 V., and the electrodeposition is conducted at a bath pH of 7 or lower, preferably 4 - 6.
Claim 14
Dependent Claim
32 words
A method as claimed in claim 1 wherein the bath further contains an organic solvent which is a solvent for the binder resin but is substantially non-solvent for the non-ionic resin powder.
References Cited (Backward Citations)
US3679615A
Cited
US3476668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |