JPH03141137A - Photochromic safety glass - Google Patents

Abstract

PURPOSE:To obtain glass having light screening effects, not raising the temperature in the room and giving little feeling of heat by laminating glass coated with a film to reflect far infrared part and infrared part among light rays passing through a photochromic composition to glass. CONSTITUTION:This safety glass is prepared by laminating a transparent material 1 comprising inorganic or organic glass, a photochromic composition 2, a transparent resin film 3 and a transparent heat reflecting film 4 to glass or acrylic resin 5 having the surface formed by metallizing or sputtering. In the safety glass, the heat reflecting glass is attached to one side of glass and the composition 2 exists before the heat reflecting film 4 when watched from the side of incident light. Consequently, light rays at far infrared part and infrared part are reflected besides light adjusting function by the composition 2 and the purpose is attained. The heat reflecting film is a single layer of metallic film such as silver or a composite film of combination of the metallic film and tin oxide, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a photochromic laminated glass having a heat ray reflecting function in addition to a light control function using a photochromic composition.

(Prior Art) Conventional photochromic laminated glass is produced by printing an ink-like photochromic composition 2 containing a photochromic agent on the surface of a transparent resin film 3 such as polyvinyl butyral, as shown in FIG. piece of glass 1
, 5 are thermo-compressed.

(Problem to be Solved by the Invention) However, in such conventional photochromic light control glass, the spectral characteristics of the photochromic glass before and after color change are as shown in FIG. Because the external transmittance is very high,
The problem is that although the transmission of visible light is suppressed after discoloration, near-infrared and infrared light, which actually increases the temperature in the room and gives a feeling of heat signature when irradiated to the human body, is transmitted through as is. was there.

(Means for Solving the Problems) This invention has a heat ray reflective film attached thereto that functions as a wavelength selective film that selectively reflects near-infrared and infrared light from the light that has passed through the photochromic composition. This is based on the discovery that the above problems can be solved by laminating glass.

Therefore, the photochromic laminated glass of the present invention has at least one transparent resin film sandwiched between two pieces of glass, and one or more of the transparent resin films has a photochromic composition. A heat ray reflective film is attached to the surface containing the substance and in contact with one transparent resin film on one side of the glass,
It is characterized in that the photochromic composition is present in front of the heat ray reflective film when viewed from the light incident side.

(for production) The present invention will be explained below based on the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.

First, to explain the composition, ① is a transparent material made of inorganic glass or organic glass such as an acrylic resin plate, 2 is a photochromic composition made of spironaphthoxazine, etc.
3 is a transparent resin film such as polyvinyl butyral, and 4 is a transparent heat ray reflecting film, which is formed on the glass or acrylic resin 5 by vapor deposition or spackling. To explain in more detail, the first step of forming the photochromic composition layer 2 is to screen print a photochromic ink prepared according to the formulation shown in the table below on the surface of the transparent resin film 3, and then heat and dry it. I used something similar.

The surface photochromic composition can be formed as a photochromic composition layer by printing on a transparent resin film or by dipping, spraying, or other operations as described above, or by kneading the photochromic composition into a resin in advance. It is used by extrusion molding a uniformly dispersed sheet.

Next, the transparent heat ray reflective film is a vapor deposited film formed by vapor deposition or sputtering, and this is not a special film. In other words, on a well-cleaned glass surface, a single layer of metal film such as silver, titanium, or stainless steel, or a metal film and tin oxide, titanium oxide, etc.
It has a multilayer film made of a combination of metal oxides such as zinc oxide and ITO (indium tin oxide).

The film formed on the glass surface using a vapor deposition and spackling apparatus is as shown in FIG. 2, for example. Furthermore, the second
In the heat reflective film attached to the glass surface shown in the figure, 1
is an inorganic glass base (opposite), 2 is a 180-layer thick film of titanium oxide, 3 is a 180-layer film of titanium oxide, and 4 is a 180-layer thick film of titanium oxide.
It has a three-layer structure with a membrane of zero thickness.

It was confirmed that this configuration effectively reflected infrared rays. As a result of measuring this reflection characteristic from ultraviolet to infrared, the spectral reflection characteristic diagram (incident angle io'') shown in FIG. 3 was obtained.

It is natural that it reflects infrared light, since this is its purpose, but measurements have revealed that it also reflects a large amount of ultraviolet light. In other words, the amount of ultraviolet light in the light that passes through the heat ray reflective film is extremely reduced. Therefore, as mentioned above, in terms of the order in which light passes, it is necessary to have a photochromic layer first, followed by a heat ray reflective film. This order is the same if it is a flat plate, especially if it is turned inside out, but if it is a curved plate such as those used in automobile windows, this order has an important meaning.

For example, if an automobile windshield is taken as an example, the structure is shown in FIG. 4. This laminated glass is manufactured by first applying a heat ray reflecting film 4 on the outside of the glass 5, which is the glass on the interior side of the automobile.
It is manufactured by depositing a polyvinyl butyral film 3, a photochromic composition layer 2, and a glass 1 in order on the outside of this layer. In the curved glass obtained in this way, the outside where the light rays enter and the inside where the light passes through are bright.
``Properly differentiated. Therefore, it is necessary to have a photochromic composition layer along the concave surface of the outer glass, and to form an infrared reflective film layer on the convex surface that contacts the polyvinyl butyral film of the inner glass.If this is formed in reverse, ultraviolet rays will be blocked. Photochromic has almost no coloration.

When the spectral transmission characteristics of the laminated glass having the configuration shown in Figure 4 are measured from visible light to infrared light while being colored by sunlight, the results are as shown in Figure 5, and the visible part of the photochromic layer is This means that a sufficient light-shielding effect was obtained by the absorption of light and the reflection of infrared light by the heat-reflecting film. .

(Effects of the Invention) As explained above, in the laminated glass of the present invention, a heat ray reflective film is attached to one side of one glass, and the photochromic composition is placed in front of the heat ray reflective film when viewed from the side where light is incident. Due to its presence, in addition to the light control function provided by the photochromic composition, near-infrared and infrared rays are reflected, which has a light-shielding effect, does not increase indoor temperature, and prevents sunlight from hitting the human body. However, there is no sensation of heat or heat.

Furthermore, since the heat ray reflective film functions as a wavelength selective film, it has an antenna function and can be used for transmitting and receiving radio waves, that is, for television, radio, etc.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a photochromic laminated glass according to an example of the present invention, FIG. 2 is an enlarged cross-sectional view of a glass and a heat-ray reflective film portion for explaining an example of a heat-ray reflective layer in a photochromic laminated glass according to the present invention, and FIG. The figure is a spectral transmission characteristic diagram of the laminated glass having the heat ray reflecting film shown in Fig. 2, Fig. 4 is a cross-sectional view of the photochromic laminated glass of another example of the present invention, and Fig. 5 is the spectral transmission characteristic of the laminated glass of the photochromic laminated glass of Fig. 4. 6 is a cross-sectional view of a conventional photochromic laminated glass, and FIG. 7 is a spectral transmission characteristic diagram of the photochromic laminated glass shown in FIG. 6. 1.5...Glass 2...Photochromic composition 3...Transparent resin film 4...Transparent heat ray reflective film 6...Titanium oxide film 7...Silver film 8...Titanium oxide film No. Figure 1 Figure 4 Figure 2 Figure 5 Figure 3 00 00 00 J length (q@) +000 rzo. Chest 10 Wavelength (1+Inertia)

Claims (1)

[Claims] At least one or more transparent resin films sandwiched between one or two glasses, one or more of the transparent resin films containing a photochromic composition, and on one side of one of the glasses. 1. A photochromic laminated glass to which a heat ray reflective film is attached, and a photochromic composition is present in front of the heat ray reflective film when viewed from the light incident side.