Stock material or miscellaneous articles – Composite – Of metal
Reexamination Certificate
1997-11-04
2001-05-22
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Composite
Of metal
C428S324000, C428S328000, C428S332000, C428S461000
Reexamination Certificate
active
06235399
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to a resin-coated metal sheet with higher vivid reflectivity having the excellent workable adhesion strength, in particular, to a resin-coated metal sheet with higher vivid refelectivity having the excellent workable adhesion strength in which even if the resin-coated metal sheet is formed under the severe condition against the resin-coated metal sheet, for instance, by stretch-forming of the resin-coated metal sheet or by deep-drawing thereof, delamination does not occur so that the excellent workable adhesion strength is shown.
(2) Description of the Prior Art
Recently, decorative design of higher grade is being pursued, together with the grade of articles such as domestic electrical machinery and apparatus, audio, kitchen appliance, and interior finish materials being made higher. Decorative design of higher grade is expressed by the decorativeness of the surface of packing materials, in particular, the higher vivid reflectivity. Further, decorative design can be expressed by the shape of package which is formed by stretch-forming of the resin-coated metal sheet or by deep-drawing thereof. Accordingly, the requirement for a decorative steel sheet with higher vivid reflectivity having the workable adhesion strength fit for stretch-forming of the resin-coated metal sheet or by deep-drawing thereof is increasing.
In order to satisfy the requirement, various researches were made. For instance, there was proposed a method of laminating a colored metal sheet with a transparent thermosetting resin film or thermoplastic resin film of 5 to 100 &mgr;m and a thermoplastic resin film of 5 to 50 &mgr;m thickness having H to 7B hardness as disclosed in Japanese Patent Publication (Kokai) 55126 of 1991 (Heisei 2).
The vivid refelectivity can be obtained by the above-mentioned method. However, since delamination occurs in the interface between two resin component layers or the interface between laminated resin layer and colored metal sheet, the workable shape of the decorative metal sheet is limited.
Namely, in the prior art, it was extermely difficult to obtain a laminated metal sheet which has the workability fit for stretch-forming of the resin-coated metal sheet or by deep-drawing thereof and besides the vivid reflectivity.
It is an object of the present invention to provide a resin-coated metal sheet which has the workable adhesion strength fit for stretch-forming of the resin-coated metal sheet or by deep-drawing thereof, and the excellent vivid reflectivity.
DISCLOSURE OF THE INVENTION
A resin-coated metal sheet of the present invention comprises a metal sheet as a base sheet of which at least one surface is overlaid in sequential order from the base sheet side with a paint layer, a modified polyolefin resin layer of 5 to 100 &mgr;m thickness, a printed and/or solid colored print layer, namely a decorative layer, an adhesive layer and a transparent polyester resin film of 5 to 100 &mgr;m thickness.
Further, a resin-coated metal sheet of the present invention comprises a metal sheet as a base sheet of which at least one surface is overlaid in sequential order from the base sheet side with a paint layer, a decorative layer, a modified polyolefin resin layer of 5 to 100 &mgr;m thickness, an adhesive layer, and a transparent polyester resin film of 5 to 100 &mgr;m thickness.
Furthermore, a resin-coated metal sheet of the present invention comprises a metal sheet as a base sheet of which at least one surface is overlaid in sequential order from the base sheet side with a paint layer, a modified polyolefin resin layer of 5 to 100 &mgr;m thickness, an adhesive layer, and a transparent polyester resin film of 5 to 100 &mgr;m thickness.
In these resin-coated metal sheets of the present invention, the paint layer is preferably formed as a top coat layer of the transparent polyester resin film.
Further, in these resin-coated metal sheets of the present invention, the adhesive layer and/or the decorative layer desirably includes aluminium pigment or mica pigment.
[Action and Effect]
Since the modified polyolefin resin layer which is provided in between the transparent polyester resin film and the metal sheet has the excellent adhesiveness against the printing layer, the paint layer and the polyester resin film, even if the resin-coated metal sheet is formed under the severe condition against the resin-coated metal sheet, for instance by deep drawing, delamination does not occur so that the excellent workable adhesion strength is shown. Further, the roughness of the surface of the metal sheet, and unevenness of several component layers (resin layers) are absorbed by a modified polyolefin resin layer so that the excellent vivid reflectivity for a resin-coated metal sheet can be obtained.
Further, since the paint layer is formed as the top coat layer (what is called “top coat”or protective top layer) of the transparent polyester resin film, scratch resistance of the resin-coated metal sheet required when the resin-coated metal sheet is formed or handled can be improved.
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patent: 5648126 (1997-07-01), Kameya et al.
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Minamigi Takashi
Nakamoto Tetsuo
Sugimoto Yoshiyuki
Browdy and Neimark
Jones Deborah
LaVilla Michael
Toyo Kohan Co. Ltd.
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