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US 6,582,575 B2Granted
Coating film-forming method
AssigneeKansai Paint Co., Ltd.
InventorsShinji Miyatake, Akira Tominaga, Hidehiko Haneishi
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AssigneeKansai Paint Co., Ltd.
InventorsShinji Miyatake, Akira Tominaga, Hidehiko Haneishi
Estimating the term…
A coating film-forming method that includes a first step that involves coating a cationic electrodeposition coating composition (A) containing an electrically conducting agent, followed by washing with water and heat curing and drying to form a cured cationic electrodeposition coating film. A second step that involves coating such an anionic electrodeposition coating composition (B). The coating film formed therefrom has a chromatic color or a white color as an achromatic color onto the cured cationic electrodeposition coating film. This is followed by washing with water, and removing water by preheating or air blowing to form a non-cured anionic electrodeposition coating film. A third step that involves coating a topcoating composition (C) thereonto to form a non-cured topcoating film, and heat curing and drying a resulting laminated coating film simultaneously.
A coating film-forming method comprising a first step which comprises coating a cationic electrodeposition coating composition (A) containing an electrically conducting agent so that a cured coating film formed therefrom have a volume resistivity of 1012 Ω·cm or less onto a metal substrate selected from the group consisting of an automobile body and automobile parts, followed by washing with water and heat curing and drying to form a cured cationic electrodeposition coating film;
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
The last layer being a clear coat: some layers being coated "wet-on-wet", the others not
No clear coat specified: some layers being coated "wet-on-wet", the others not
Metallic effect: achieved by multilayers
Processes for applying fluent materials to surfaces, in general
Term ended 19 Jan 2022 (estimated)
This application has priority benefit of Japanese Patent Application No. 00/258745, filed on Aug. 29, 2000.
(1) Field of the Invention
The present invention relates to a coating film-forming method, more particularly to a coating film-forming method which comprises coating a cationic electrodeposition coating composition containing an electrically conducting agent onto a metal substrate such as an automobile body, followed by curing and drying, coating an anionic electrodeposition coating composition onto a cured coating film to form a non-cured coating film, coating a topcoating composition onto the non-cured coating film to form a non-cured topcoating film, and heat curing and drying a resulting laminated film simultaneously.
FIG. 1 is a schematic view of a test panel 2 used in a sagging properties test in coating, in which the test panel is a steel sheet having a punched hole 1 of 10 mm in diameter, excemplifying a keyhole in a door part.
Details of the first to third steps, the cationic electrodeposition coating composition (A), anionic electrodeposition coating composition (B), topcoating composition (C), water based solid color topcoating composition (a), water based metallic base coat (b) and clear top coat (c) in the present invention are explained hereinafter respectively. First Step:
A coating substrate used in the first step may include ones having a complicated structure, for example, an automobile body, automobile parts, bag parts, etc. A material of the coating substrate may include metal, preferably an anticorrosive steel plate from the standpoint of anti-corrosive properties.
Examples of the steel plate may include melt galvanized steel plate, electrically galvanized steel plate, electrical zinc-iron bilayer plated steel plate, organocomposite plated steel plate, as well as ones prepared by subjecting a base material such as the above steel plates, cold rolled steel sheet, etc. to optionally a surface-cleaning treatment by an alkali degreasing or the like, followed by a surface treatment such as phosphate process, chromate process or the like.