US4789566A
Expired / Lapsed
US
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Process for coating a metallic substrate
Assignee: Kansai Paint Co Ltd
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Filing: 1987-05-07
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Granted: 1988-12-06
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Expires: 2007-05-07
Abstract
Abstract A process for coating a metallic substrate, which comprises applying an electrocoating paint to a metallic substrate, then applying a barrier coating comprising a crosslinking hardenable resin and being capable of forming a barrier coat film having an elongation at break of at least 150% and a stress at break of at least 20 kg/cm 2 to the electrocoated film, optionally applying an intermediate coating paint to the barrier coat, and finally applying a top coating paint to the barrier coat or the intermediate coat.
Inventors
- 👤 Tadayoshi Tatsuno
- 👤 Seiji Kashiwada
- 👤 Komaji Matsui
- 👤 Mituo Wakimoto
- 👤 Ichiro Tabuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:42
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/56; C; C09; C09D; C09D5/00; C09D5/44; B05D1/00; B05D1/007; B05D2202/00
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
116 words
A process for coating a metallic substrate which comprises: applying an electrocoating paint to a metallic substrate, said electrocoating paint selected from the group consisting of a cationic electrocoating paint comprising as a main component a basic amino group-containing resin neutralized with an acid, the resin before neutralization having a base value of about 20 to about 200, then applying a barrier coating to the electrocoated surface, said barrier coating comprising a crosslinkable hardenable resin and being capable of forming a barrier coat film having an elongation at break of 180 to 1500% and a stress at break of 30 to 700 kg/cm 2 , and applying a top coating paint as the final paint coating.
Claim 2
Dependent Claim
116 words
A process for coating a metallic substrate which comprises: applying an electrocoating paint to a metallic substrate, said electrocoating paint selected from the group consisting of a cationic electrocoating paint comprising as a main component a basic amino group-containing resin neutralized with an acid, the resin before neutralization having a base value of about 20 to about 200, then applying a barrier coating to the electrocoated surface, said barrier coating comprising a crosslinkable hardenable resin and being capable of forming a barrier coat film having an elongation at break of 180 to 1500% and a stress at break of 30 to 700 kg/cm 2 , and applying a top coating paint as the final paint coating.
Claim 3
Dependent Claim
23 words
A process according to claim 1 wherein the electrocoating paint is a thermosetting electrocoating paint of cathodic deposition type or anionic deposition type.
Claim 4
Dependent Claim
28 words
A process according to claim 1 wherein the electrocoating paint contains 35 parts by weight or less of pigments based on 100 parts by weight of resin solid.
Claim 5
Dependent Claim
35 words
A process according to claim 1 wherein the electrocoating paint contains 40 to 150 parts by weight, preferably 55 to 100 parts by weight of pigments based on 100 parts by weight of resin solid.
Claim 6
Dependent Claim
35 words
A process according to claim 1 wherein the film formed by the barrier coat has an elongation at break of 200 to 850% and a stress at break of 40 to 500 kg/cm 2 .
Claim 7
Dependent Claim
16 words
A process according to claim 1 wherein the barrier coat is an organic solent type paint.
Claim 8
Dependent Claim
15 words
A process according to claim 1 wherein the barrier coat further compresses a corrosion-preventive pigment.
Claim 9
Dependent Claim
24 words
A process according to claim 7 wherein the corrosion-preventive pigment is that of which aqueous extract has an electroconductiviy of at least 100 μν/cm.
Claim 10
Dependent Claim
29 words
A process according to claim 7 wherein the barrier coat contains, per 100 parts by weight of the crosslinking hardenable resin, 0-150 parts by weight of the corrosion-preventive pigment.
Claim 11
Dependent Claim
26 words
A process according to claim 7 wherein the corrosion-preventive pigment is selected from the group consisting of zinc chromate, strontium chromate, barium chromate and calcium chromate.
Claim 12
Dependent Claim
25 words
A process according to claim 7 wherein the film formed by the barrier coat is 1 to 20μ in terms of thickness of dried film.
Claim 13
Dependent Claim
56 words
A process according to claim 3 wherein the intermediate coating paint is a thermosetting intermedaite coating paint of organic solvent type or aqueous type containing, as a vehicle main component, a combination of (1) an oil alkyd resin having an oil length of 30% or less and/or an oil-free polyester resin and (2) an amino resin.
Claim 14
Dependent Claim
30 words
A process according to claim 3 wherein the film formed by the intermediate coating film has a thickness of 10 to 100 μ in terms of thickness of cured film.
Claim 15
Dependent Claim
21 words
A process according to claim 1 wherein the top coating paint is a paint capable of forming a tough-hard coating film.
Claim 16
Dependent Claim
33 words
A process according to claim 14 wherein the tough-hard coating film has an elongation at break of not more than 40% and a stress at break of at least 300 kg/cm 2 .
Claim 17
Dependent Claim
32 words
A process according to claim 14 wherein the tough-hard coating film has an elongation at least of 5 to 30% and a stress at break of 350 to 1000 kg/cm 2 .
Claim 18
Dependent Claim
16 words
A process according to claim 1 wherein the top coating paint is in a powder form.
Claim 19
Dependent Claim
14 words
A process according to claim 17 wherein the barrier coat contains a compatible solvent.
Claim 20
Dependent Claim
25 words
A pocess according to claim 1 wherein the barrier coat contains at leat one deterioration inhibitor for resins, selected from ultraviolet absorbers, photostabilizers and anti-oxidants.
Claim 21
Dependent Claim
11 words
A metallic substrate coated according to a process of claim 1.
Claim 22
Dependent Claim
110 words
A process according to claim 1, wherein the crosslinking hardenable resin in the barrier coating is selected from the group consisting of compositions comprising a polybutadiene or butadiene/acrylonitrile copolymer each having a number average molecular weight of about 10,000 to about 1,000,000 and containing a functional group at the terminals selected from amino, hydroxyl and carboxyl groups and a curing agent as main components and urethane-modified polyester resins having a hydroxyl value in the range of 20 to 100 obtained by increasing the molecular weight of polyester resins having a number average molecular weight of 500 to 10,000 through reaction with isocyanate compounds, and a crosslinking agent as main components.
Claim 23
Dependent Claim
55 words
The process of claim 1, wherein the top coating paint is an amino acryl resin paint comprising as a main component an acrylic resin containing an amino resin as a crosslinking agent or an amino alkyd resin paint comprising a thermosetting alkyd resin as a main component containing an amino resin as a crosslinking agent.
Claim 24
Dependent Claim
23 words
A process according to claim 1 which comprises applying an intermediate coating onto the barrier coat before applying the final top coating paint.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |