JP4108938B2 - Colored glass to protect the privacy of automobile side and rear windows - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a colored glass in which a colored film is formed on a plate glass for the purpose of privacy protection, which is used for a vehicle window and a rear and side window of an automobile.
[0002]
[Prior art]
As a glass sheet used for protecting privacy, a glass sheet having a fine uneven surface or a glass pattern with a pattern has been used for construction. Such a plate glass is such that when visible light passes through the plate glass, it is scattered so that the inside of the room cannot be seen from the outside.
[0003]
In recent years, privacy protection has also been demanded for vehicles such as automobiles. In the case of an automobile, it is necessary to see an outdoor scenery, and therefore, a plate glass surface that has been used for construction or the like cannot be used.
[0004]
Currently, many plate glasses used for privacy protection for automobiles have a reduced light transmittance in the visible range, and add raw materials containing metals such as Fe, Co, Ce, Ti to the raw materials of the plate glass, Colored plate glass, a transparent plate glass, or a surface of the above-described colored plate glass coated with an optical thin film by chemical vapor deposition or physical vapor deposition is used. The plate glass with reduced transmittance utilizes the phenomenon that it is very difficult to see a dark place in an automobile room from a bright place, and conversely, it is not difficult to see a bright outdoor place from an automobile room.
[0005]
Flat glass for the purpose of protecting privacy for automobiles is mainly used in the rear and side parts of cars. A high-mount stop lamp is often mounted on the rear glass plate. The portion of the rear plate glass on which the high-mount stop lamp is mounted preferably has a higher visible light transmittance. Therefore, a colored plate glass manufactured for privacy protection is difficult to use.
[0006]
Moreover, the glass sheet for privacy protection which coat | covered the surface peels off the coating film of the part to which a high mount stop lamp is attached using acidic chemical | medical solution, for example, as disclosed by Unexamined-Japanese-Patent No. 2000-7381. Therefore, it is required to increase the transmittance.
[0007]
As a means for partially reducing the transmittance of the plate glass, a method is known in which a colored paste is printed on the surface of the plate glass by a screen printing method or a flexographic printing method, and the printed paste is baked to form a coating film. Using this technology, except for places where high-mount stop lamps are installed, colored coatings are screen-printed or flexographically printed to form a colored film on the glass, making it difficult to see the interior from the outside of the vehicle, and attaching high-mount stop lamps, etc. The transmittance | permeability of the plate glass of such a location is securable.
[0008]
[Problems to be solved by the invention]
However, when the above-mentioned colored paste is coated on the surface of the plate glass to form colored glass, depending on the paste used for the coated film, the reflected color of the coated film seen from the outside of the vehicle has a high stimulation purity, which may cause discomfort to the viewer. It will cause. It is not preferable that such a car travels on a public road, and therefore, colored glass coated with a colored paste has been difficult to actually use.
[0009]
[Means for Solving the Problems]
The colored glass of the present invention has a translucent coating on the surface of the plate glass, from the vicinity of the central portion of the glass to the vicinity of the peripheral portion,
The coating film is formed in a pattern in which circles or rectangles are arranged, or the coating film is formed in a pattern of parallel lines or a lattice,
Furthermore, the aperture ratio (ratio of the area of the non-coating surface) is 10% to 70%, and is formed in a dispersed manner, limiting the visible light transmittance of the coating glass and the non-coating part (plate glass). The visible light transmittance obtained by multiplying the visible light transmittance by the respective area ratios) is a colored glass of 30% or more,
The coating film is formed of a colored paste composed of noble metal fine particles having a particle diameter of 1 to 100 nm, an organometallic compound, a binder resin and an organic solvent, and the stimulation value y of the coating film viewed from the outside is 5 to 15%. It is a colored glass for protecting privacy used for the side and rear windows of the car.
[0011]
When the coating is formed in a circular or rectangular pattern, the maximum side length of the circular diameter or rectangular is 2 mm or less, and when the line is formed in a parallel or lattice pattern, the line width is It is a colored glass characterized by being 2 mm or less.
[0012]
Further, the colored glass is characterized in that the coating film contains fine particles having a particle diameter of 100 nm or less made of at least one of gold, platinum, palladium, rhodium and silver.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The colored glass of the present invention is produced by printing a colored paste on the surface of a plate glass to form a coating film.
[0014]
Various plate glasses, such as float plate glass and heat ray absorption plate glass, can be used for plate glass.
[0015]
The colored paste is printed by a printing method such as screen printing or flexographic printing that can form a coating film portion and a coating film-free portion.
[0016]
As shown in FIG. 5, the stimulation value y of the coating film formed on the plate glass as viewed from the outdoor side is preferably 5 to 15%, and more preferably 5 to 10%. If the stimulus value y is smaller than 5%, the presence of the coating film is not recognized and the performance of protecting the privacy is lost.
[0017]
In addition, if the stimulation value y exceeds 15%, unpleasant sensation is generated, which is not preferable. Furthermore, it is desirable that the stimulation value y is 10% or less because stimulation is reduced and a soft impression is given.
[0018]
Therefore, when the stimulation purity of the coating film exceeds 15%, the present invention provides an effective means for producing colored glass using the coating film.
[0019]
The stimulus value y is obtained by performing spectroscopic measurement in the visible region of the reflected light with the ratio of the area of the coating film part to the area of the non-coating part in the optical measurement range being the same as the aperture ratio Nf of the colored glass to be produced. The stimulus purity is calculated from the spectral data obtained by the measurement based on JIS Z 8701 (color display method—XYZ color system and X ₁₀ Y ₁₀ Z ₁₀ color system), and the calculated stimulus purity value is calculated. The stimulus value is y.
[0020]
The required stimulus value y differs depending on the aperture ratio (area ratio of the non-coat surface) Nf of the coating film, and the aperture ratio Nf is determined using the stimulus value y0 having an aperture ratio of 0% and the stimulus value y50 having an aperture ratio of 50%. The stimulus value y for can also be approximately calculated by the following equation.
ln (ln (y)) = (ln (ln (y0) −ln (ln (y50)) × (50 / Nf))
It is preferable to make the formed coating film translucent because it does not hinder the field of view. However, since the field of view is maintained through a portion where the colored film is not formed, the coating film may be opaque.
[0021]
In order to use the colored glass for protecting privacy according to the present invention for the side and rear windows of an automobile, the visible light transmittance of the coating film and the visible light transmittance of the non-coating part (plate glass) are respectively It is desirable that the visible light transmittance Tv, which is obtained by multiplying by the total area, is 30% or more.
[0022]
That is, the visible light transmittance Tf obtained from Tf × (1−Nf) + Tg × Nf from the visible light transmittance Tf of the coating film, the visible light transmittance Tg of the plate glass without the coating film, and the aperture ratio Nf (unit%). Tv is preferably 30% or more.
[0023]
FIG. 1 is a colored glass of the present invention used for an automobile rear window. As shown in FIG. 2, the rear window glass of the automobile has a black paint 2 on the periphery, and further has a dotted black paint 4 for blurring on the glass center side of the peripheral black paint 2. In the colored glass of the present invention, as shown in FIG. 1, since the coating film 1 has a blurring effect, it is preferable that there is no dotted black coating 4.
[0024]
The coating film to be formed is a dot pattern shown in FIG. 3, a lattice pattern shown in FIG. 4, a striped line pattern, or the like. The stimulus purity of the membrane is apparently reduced. The coating film may be provided in an arbitrary range from the vicinity of the central portion of the glass to the vicinity of the peripheral portion.
[0025]
In the case of the dot pattern of FIG. 3, the shape of the coating film portion 6 is preferably rectangular (a in FIG. 3) or circular (b in FIG. 3), and the maximum dimensions (d _w , d) are preferably 2 mm or less. In the case of a lattice pattern, the dimension of the line width (w _v , w _h ) of the coating film part 6 is preferably 2 mm or less. This is because, if the above-mentioned dimension exceeds 2 mm, even if the coating film is printed in a pattern as shown in FIG. 3 or FIG.
[0026]
When printing a dot pattern, the aperture ratio is changed by changing the size and density of dots (the number of dots printed per unit area). When printing dots, the dots may be printed in a pattern in which dots of the same size are arranged, or different sizes of dots may be repeatedly changed in size. Further, dots with different dot sizes may be arranged randomly and the aperture ratio may be changed depending on the location.
[0027]
In the case of a lattice pattern or a line pattern, the aperture ratio is changed by changing the thickness of the line. The thickness of the line may be the same or different.
[0028]
It is desirable to use the coating film on the indoor side of the plate glass for durability.
[0029]
When the colored glass of the present invention is formed with a colored film with an aperture ratio of 0%, the stimulus purity is high, causing discomfort to the viewer, and even when the commercial value is almost lost, the aperture ratio is increased to increase the stimulus value y. Is made small so that it can be used as colored glass.
[0030]
The stimulus value y is preferably 15% or less in order to keep the appearance good, and in order to reduce the stimulus value y in this way, the aperture ratio is preferably 10% or more.
[0031]
Furthermore, if the stimulus value y is too small, the performance as a colored glass is lost. In order to ensure the performance of the colored glass, it is desirable that the stimulus value y is 5% or more and the aperture ratio is 70% or less.
[0032]
The printed colored paste is baked on the surface of the plate glass to form a coating film. When baking the colored paste, the plate glass can be air-cooled.
[0033]
The colored paste may be any paste that can form a translucent coating film on the surface of the plate glass. For example, a colored paste composed of noble metal fine particles having a particle diameter of 1 to 100 nm, an organometallic compound, a binder resin and an organic solvent described in JP-A-10-25131 is a preferred colored paste for carrying out the present invention. . As this colored paste, gold, platinum, palladium, rubidium, silver, or the like is used for the noble metal fine particles, and a Ti-organic compound, a Fe-organic compound, a Si-organic compound, or the like is used for the organic metal. In addition, nitrocellulose, ethylcellulose, cellulose acetate, and butylcellulose are used as the binder resin, and the organic solvent does not agglomerate gold or silver fine particles. For example, metacresol, carbitol, dimethylformamide, dimethylimidazolidinone, and tarpinol. , Diacetone alcohol, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether and the like are used.
[0034]
【Example】
Hereinafter, the present invention will be described in detail with reference to the drawings.
[0035]
Example 1
A colored paste (High Star T, Mitsuboshi Belting Co., Ltd.) composed of gold ultrafine particles, silver ultrafine particles, Ti stearate, polydimethylsiloxane, ethylcellulose, and terpineol was used.
[0036]
This paste was applied to a transparent float glass having a thickness of 3.5 mm on a dot pattern shown in FIG. 3A by using a screen printer so that a square with a side of 1 mm was 50%. The coated glass was dried at 120 ° C. for 5 minutes in a drying furnace, and then heat-cured at 650 ° C. for 3 minutes in a baking furnace to obtain a coating film, thereby obtaining a colored glass.
[0037]
The coated film is visually bright blue, and the reflected light of the colored glass of this example is spectroscopically measured with a U-4000 type self-recording spectrophotometer manufactured by Hitachi, Ltd., and the measured spectral data is used. The stimulation value y was calculated based on JIS Z 8701 (color display method—XYZ color system and X ₁₀ Y ₁₀ Z ₁₀ color system). The stimulation value y in this example was 5%.
[0038]
When the colored glass of this example is mounted on the rear window of an automobile, it has excellent privacy performance that prevents the indoor see-through and does not give an uncomfortable appearance.
confirmed.
[0039]
Example 2
A coating film was formed in the same manner as in Example 1 except that the opening ratio of the coating film was 13%. The stimulation value y of the obtained colored glass was 12%, and good results were obtained in the same manner as in Example 1 with respect to privacy performance and appearance.
[0040]
Comparative Example 1
A coating film was formed in the same manner as in Example 1 except that the opening ratio of the coating film was 0%. The stimulus value y was as large as 18% and the privacy performance was good, but the appearance was strong in color and uncomfortable and uncomfortable.
[0041]
Comparative Example 2
A colored film was formed in the same manner as in Example 1 except that the aperture ratio was 80%. The coating film of this example had a small colored area, and the stimulation value y was 3%, which is almost the same as that of the glass surface without the coating film, and the privacy protection performance was hardly recognized.
[0042]
【The invention's effect】
The present invention makes it possible to produce a colored glass for protecting privacy used for practical automobile side and rear windows using a coating film of a colored paste having a high stimulus purity.
[Brief description of the drawings]
FIG. 1 is a plan view of a colored glass used for an automobile rear window glass of Example 1. FIG.
FIG. 2 is a plan view of glass used for a normal automobile rear window glass.
FIG. 3 is a dot pattern coating.
FIG. 4 is a lattice pattern coating.
FIG. 5 is a graph showing an aperture ratio and a stimulation value y in an example and a comparative example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Black coating part 2 Coating film 3 High mount stop lamp attaching part 4 Point-like coating film 5 Non-coating part 6 Coating part

Claims (4)

On the surface of the plate glass, a translucent coating film , from near the center of the glass to near the periphery,
The coating film is formed in a pattern in which circles or rectangles are arranged, or the coating film is formed in a pattern of parallel lines or a lattice,
Furthermore, the aperture ratio (ratio of the area of the non-coating surface) is 10% to 70%, and is formed in a dispersed manner, limiting the visible light transmittance of the coating glass and the non-coating part (plate glass). The visible light transmittance obtained by multiplying the visible light transmittance by the respective area ratios) is a colored glass of 30% or more,
The coating film is formed of a colored paste composed of noble metal fine particles having a particle diameter of 1 to 100 nm, an organometallic compound, a binder resin and an organic solvent, and the stimulation value y of the coating film viewed from the outside is 5 to 15%. Colored glass to protect the privacy used for the side and rear windows of the car. 2. The colored glass according to claim 1, wherein when the coating film is formed in a pattern in which a circle or a rectangle is arranged, the diameter of the circle or the maximum side length of the rectangle is 2 mm or less. 2. The colored glass according to claim 1, wherein the line width is 2 mm or less when the coating film is formed in a parallel or lattice pattern. The colored glass according to any one of claims 1 to 3, wherein the coating film contains fine particles having a particle diameter of 100 nm or less, which is composed of at least one of gold, platinum, palladium, rhodium, and silver. .

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