Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1998-02-04
2000-05-09
Speer, Timothy M.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428210, 428328, 428434, 428469, B32B 1700
Patent
active
060601515
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a glass panel having on a surface thereof a colored film which is durable, does not excessively reflect visible light, and is transparent or semitransparent, the glass panel with such a colored film being sightly in appearance.
BACKGROUND ART
One conventional process of forming a colored film on a glass panel employs Ag staining as disclosed in Japanese laid-open patent publications Nos. 56-14454 and 57-95854.
It is also known to employ a lustering solution of a precious metal such as Au or Pd dissolved in rosemary oil to form a colored film according to the screen printing process.
The colored film formed on a glass panel through Ag staining has been disadvantageous in that the colored film tends to suffer color irregularities because the dispersion of Ag somewhat varies depending on the temperature. The colored film is also problematic in practical use since it is poor in wear resistance and acid resistance.
The colored film formed of the lustering solution by the screen printing process is also poor in wear resistance and acid resistance because it is in the form of a foil composed of bonded metal crystals, and suffers a high manufacturing cost because is made of the natural material. Another drawback is that since the colored film produces a metallic luster and has a high reflectance, if the glass panel is used as an automobile glass panel, then it is not preferable from the standpoint of traffic safety due to reflections it produces toward automobiles running behind.
DISCLOSURE OF THE INVENTION
The present invention has been made in view of the problems which the conventional glass panels suffer. It is an object of the present invention to provide a glass panel with a colored film which is durable, does not excessively reflect visible light, and is transparent or semitransparent.
According to the present invention, a glass panel has a transparent or semitransparent colored film in which fine particles of gold having an average diameter of 10 nm or less are dispersed, the colored film being formed partly or wholly on a surface of a glass panel.
The colored film should preferably contain a material for suppressing growth of fine particles of gold. The material for suppressing growth of fine particles of gold may be a compound (typically, an oxide) of a metal such as Al, Ti, Co, or the like.
The surface on which the colored film is formed should preferably have a visible light reflectance of less than 20%. This numerical value of visible light reflectance is obtained when visible light was applied to the glass panel at an incident angle ranging from 0 to 12.degree..
According to the present invention, a coloring effect due to colloidal coloration of fine particles of color is imparted to a glass panel. The colloidal coloration allows the glass panel to be easily colored uniformly without being subjected to temperature differences during the process of manufacturing the glass panel. The colloidal coloration does not produce excessive reflections of visible light, and hence does not adversely affect environments with reflected light.
Since the fine particles of gold have diameters smaller than a certain value and do not affect the process of bonding a matrix in which the fine particles of gold are dispersed, the colored film is of high hardness and is chemically stable.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view showing the manner in which a colored film paste is coated on a glass panel in a process of manufacturing a glass panel with a colored film according to the present invention; and
FIG. 2 is an enlarged view of a portion of the glass panel with a colored film according to the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
A glass panel with a colored film according to the present invention can be manufactured by a process comprising the step of coating, partly or wholly, a surface of a glass panel with a paste containing a composite material composed of fine particles of gold having an average diameter of 10 nm or les
REFERENCES:
patent: 3887383 (1975-06-01), Nesteruk
patent: 5162145 (1992-11-01), Schaefer
patent: 5693404 (1997-12-01), Shiraishi
patent: 5744245 (1998-04-01), Bishop
Kawaguchi Jun
Shiraishi Yasunori
Ohashi & Associates
Speer Timothy M.
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