Stock material or miscellaneous articles – Composite – Of epoxy ether
Patent
1995-03-01
1997-06-10
Silverberg, Sam
Stock material or miscellaneous articles
Composite
Of epoxy ether
4284721, 148265, C23C 2230
Patent
active
056374038
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an organic composite-plated steel plate which is novel and useful, as well as to a resin composition for coating material which is used in the coating thereof. In greater detail, the present invention relates to an organic composite-plated steel plate, which is obtained by applying a specified organic resin or a composition containing a specified organic resin to a specified chromate-coated plated steel plate and curing this, which has in particular superior adhesion with adhesives, superior continuous welding properties, superior post-working corrosion resistance, superior electro-deposition coating properties, superior high corrosion resistance, and superior coating material adhesion, as well as to a resin composition for coating materials.
In addition, it has been discovered that the mixture on the molecular level with the specified organic resin of a blocked isocyanate compound as a curing agent provides an organic composite-plated steel plate which has particularly superior rust resistance; the present invention provides an organic composite-plated steel plate having such a specified form.
BACKGROUND ART
As a result of problems associated with organic solvents constituting in coating materials, such as the combustibility thereof, atmospheric pollution, worker safety, and sanitation problems, it has been hoped a rapid shift from organic-solvent-based coating materials to water-based coating materials.
On the other hand, in the field of automobiles, steel household items, and household electrical appliances, the use of pre-coated metal materials has been increasing in order to improve productivity.
Accordingly, in the field of surface preparation and coating, as well, in order to respond to such demands, various coating material compositions for use in pre-coated metal materials have been developed; however, in this field, as well, the shift from conventional organic-solvent-based coating materials to water-based coating materials is strongly desired.
Furthermore, in systems employing conventional organic-solvent-based coating materials, in order to obtain the conductivity which is a necessary condition for conducting an electro-deposition coating, the inventions disclosed in, for example, Japanese Patent Application, Second Publication, No. Sho 45-2430 and Japanese Patent Application, Second Publication, No. Hei 4-6882, disclose zinc-rich coating materials. Such zinc-rich coating materials are capable of electro-deposition coating; however, the smoothness of the coated surface is insufficient. Furthermore, in such zinc-rich coating materials, the coating film is unstable with respect to rust produced in the case in which corrosion occurs, and it is impossible to guarantee corrosion resistance over a long period of time (resistance to rust cannot be guaranteed), and moreover, after working, the coating film is easily fractured, and thus the resistance to corrosion after working is poor.
On the other hand, the inventions disclosed in Japanese Patent Application, Second Publication, No. Sho 52-44569, Japanese Patent Application, Second Publication, No. Sho 58-19706, and Japanese Patent Application, First Publication, Laid-Open No. Sho 51-79138 and Japanese Patent Application, First Publication, Laid Open No. Sho 58-138758 provide coating materials having a form into which conductive pigment is blended in order to make electro-deposition coating possible.
However, in such coating materials, particulate pigment possessing a relatively large particle diameter, wherein the average particle diameter is 1 micron (.mu.m) or more, such as metallic powders of zinc, metallic carbide powders, or metallic phosphate powders, are employed as the conductive pigment. For this reason, unevenness is produced on the coating film which is formed, or, during press working, flaws resulting from the conductive materials which are added are deposited on the surface of the steel plate, and such unevenness or flaws remain on the surface of the electro-deposited coating, a
REFERENCES:
patent: 4879325 (1989-11-01), Kimura
patent: 5141822 (1992-08-01), Matsuo
patent: 5334455 (1994-08-01), Noren
patent: 5411809 (1995-05-01), Shalati
Amemoto Masahide
Kasuya Akihiro
Kuwamura Shin'ichi
Miyagaki Atsushi
Odashima Hisao
Dainippon Ink and Chemicals Inc.
Nippon Steel Corporation
Silverberg Sam
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