Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
1998-12-31
2001-09-25
Copenheaver, Blaine (Department: 1771)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S352000, C428S430000
Reexamination Certificate
active
06294251
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a colored film, and more specifically to a colored film excellent in vividness, transparency, light resistance, stability and the like.
2. Description of the Related Art
For many years, colored films have been used widely in vehicles, buildings, etc. and also as wrapping materials, display materials and the like. These colored films are used for the purpose of ornamentation, selection of desired incident light wavelengths, prevention of visibility from the outside, or the like, for example, to use them for the purpose of solar control, they are required to have excellent vividness, transparency, light resistance, stability and the like. Further, they are also required to permit easy bonding and pealing. Accordingly, each transparent film is provided on one side thereof with a layer composed of a pressure-sensitive adhesive, a heat-sensitive adhesive or the like. Incidentally, the term “pressure-sensitive adhesive” as used herein should be construed to embrace therein an autohesive (which is a material having no surface tackiness but having a property of being bonded to a smooth surface, such as a glass pane, metal plate, coated surface or plastic plate, by making use of air tightness between the smooth surface and a surface of the autohesive, that is, between these mirror-like surfaces; which will hereinafter be called simply an “autohesive”).
For coloration, it has been the conventional practice to use adhesive-soluble dyes in view of the requirement for transparency. Although it is not impossible to color a transparent film itself with a dye, this is very difficult. Coloration is therefore applied primarily to such pressure-sensitive adhesive, heat-sensitive adhesive or curable adhesive.
According to the above-described conventional art, the coloration of an adhesive with a dye is easy, and a colored film excellent in vividness and transparency is available. The colored film is however accompanied by a problem such that, when the colored film is used under conditions where it is exposed to outdoor light like a solar control film, for example, it fades or discolors after an elapse of a certain time as the dye has poor light resistance. With a view to overcoming these problems, a variety of proposals making use of pigments instead of dyes have been made. Such conventional techniques can provide colored films having excellent light resistance, but still cannot furnish color films having satisfactory vividness and transparency because pigments can hardly be dispersed as fine particles in adhesives and, even if dispersed, the thus-dispersed pigment particles tend to undergo considerable aggregation.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide a colored film colored with a pigment and having excellent vividness, transparency, light resistance, stability and the like.
To achieve the above-described object, the present invention provides a colored film formed of a transparent film and at least one colored adhesive layer colored with a coloring agent and provided on at least one side of the transparent film. The colored adhesive layer comprises a polyester resin as an adhesive, and the coloring agent comprises a pigment and a polyester-base dispersant.
According to the present invention, the formation of the colored adhesive layer with the particular adhesive and the coloration of the adhesive layer with the specific coloring agent have made it possible to provide the colored film with vividness, transparency, light resistance, stability and the like to such extents as not available at all from the conventional art.
REFERENCES:
patent: 3884505 (1975-05-01), Miller
patent: 3887742 (1975-06-01), Reinnagel
patent: 4002593 (1977-01-01), Jones
patent: 4797317 (1989-01-01), Oliver et al.
patent: 5683805 (1997-11-01), Oita et al.
Garcia Leonardo M.
Minagawa Toshio
Patel Chandrakant C.
Tachikawa Kohei
Copenheaver Blaine
Lintec Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Pratt Christopher C.
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