JPH0419650A - Photochromic laminate - Google Patents

Abstract

PURPOSE:To simultaneously attain the light shielding of a visible region and the light shielding of an IR region by incorporating a photochromic compsn. into the sheet on the side where light is made incident of two sheets of the transparent sheets to be inserted between two sheets of transparent bases or providing a photochromic layer thereon. CONSTITUTION:This laminate is constituted of two sheets of the transparent bases 1, 1, two sheets of the transparent sheets 2, 3 inserted between two sheets of the transparent bases 1 and 1, and a transparent heat ray reflecting sheet 4 which is inserted between two sheets of the transparent sheets 2 and 3 and has at least one layer of the layers having a heat ray reflecting function. The photochromic compsn. is incorporated into the transparent sheet 2 on the side where the light is made incident or the photochromic layer is provided thereon. The efficient decrease in the transmittance in the visible ray region by the photochromism and the light shielding by the reflection of near IR rays and IR rays by the heat ray reflecting function are simultaneously attained in this way.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a photochromic laminate.

(Prior Art) As a conventional photochromic laminate, there is one shown in FIG. 6, for example. The illustrated laminate is constructed by sandwiching a polyvinyl butyral interlayer film 2 treated with a photochromic composition by printing, dipping, spraying, cross-linking, etc., between two transparent supports 1 such as two sheets of glass. . Such a laminate can be obtained by sandwiching an adhesive resin sheet such as polyvinyl butyral between two transparent supports and bonding them under heat.

(Problem to be solved by the invention) However, in such a conventional photochromic laminate, the spectral characteristics of the photochromic laminate in the decolored state and the colored state are not close to each other, as shown in FIG. The transmittance was extremely high in the infrared and infrared regions, and although the transmission of visible light was suppressed by photochromic coloring, it could actually raise the indoor temperature or irradiate the human body. There is a problem in that when a person gives a feeling of heat, near-infrared rays and infrared rays pass through without being suppressed.

(Means for Solving the Problems) This invention was made by paying attention to such conventional problems. Consisting of two transparent sheets and a transparent heat ray reflecting sheet comprising at least one layer having a heat ray reflecting function sandwiched between the two transparent sheets,
The present invention relates to a photochromic laminate characterized in that one of the transparent sheets on the light incident side contains a photochromic composition or has a photochromic layer.

In the photochromic laminate of the present invention, the transparent support is usually inorganic glass, and if necessary, a transparent resin plate such as a polycarbonate resin plate or an acrylic resin plate can be used, but it is not limited thereto. There's no way it will happen.

Next, the dye as a photochromic agent in the photochromic composition used is not particularly limited, or it is preferable to use spirooxazine derivatives that have a high extinction coefficient in a colored state and good light resistance. Of course, there is no problem in including additives such as stabilizers in the composition.

The two transparent sheets sandwiched between two transparent supports include transparent resin sheets such as polyvinyl butyral, acrylic resin, vinyl acetate resin, and nitrocellulose. It can be selected by taking adhesiveness into consideration.

In the present invention, the transparent sheet on the side into which internal light is incident is made to contain the photochromic composition or provided with a photochromic layer on its surface according to a conventional method. Next, a transparent heat ray reflective sheet with a layer having an infrared reflective function sandwiched between these two transparent sheets is placed on the well-dried surface of a transparent sheet such as a nylon sheet or a polyethylene terephthalate (PET) sheet. Metals, such as aluminum, zinc, tin, palladium, copper, chromium, nickel, platinum, gold, silver, rhodium, cobalt, titanium, indium, zirconium, etc., metal oxides, such as titanium oxide, tin oxide, oxide It can be formed by forming a small amount (at least one layer) of zinc, zirconia, IT○ (indium tin oxide), etc., or a mixture thereof using an operation such as vapor deposition or sputtering.

The above laminate constituent materials are laminated in this order: a transparent support, a transparent sheet, a transparent infrared reflective sheet, a transparent sheet containing a photochromic composition or having a photochromic layer, and a transparent support, for example, pre-adhered, and then A laminate is obtained by heat-pressing main adhesion.

An example of the photochromic laminate thus obtained is shown in FIG. In FIG. 1, 1 is a transparent support, 2 is a transparent sheet containing a photochromic composition, 3 is a transparent sheet, and 4 is a transparent heat ray reflective sheet. It goes without saying that the illustrated laminate is constructed using a flat plate material, but is not limited to this.

(Example) Next, the present invention will be explained with reference to examples.

Example 1 A 0.38 mm thick polyvinyl butyral resin sheet was placed on a 2 mm thick glass plate, and a titanium oxide film, a silver film, and a titanium oxide film were placed on a 500 μm PET sheet as shown in FIG. A transparent heat ray reflective sheet sputtered to a thickness of 100 to 200 mm each [In this example, Luminola (trade name) manufactured by Toshi ■ was used], as shown in Table 1 below.
As shown in Figure 2, a transparent sheet with a thickness of 0.38 mm and a transparent sheet with a thickness of 2 mm were obtained by screen printing an ink prepared by blending the ingredients on the surface of a polyvinyl butyral resin transparent sheet, and then heating and drying the photochromic layer. The glass plates having different shapes were laminated one after another. This laminate was heated to 110'C.
After vacuum pre-bonding at 400+n+nHg for 130 minutes,
140" C112-14 kg/an 2.30 minutes, heating and pressure main adhesion was performed to obtain a laminate having the structure shown in FIG. 1.

Table 1 *1 Book 2 Plasticizer: DHA (manufactured by Mitsubishi Sunmont Kasei ■) Spirooxazine: l', 3', 3'-trimethylindoline spironaphthoxazine The above structure allows for efficient photochromic visualization as shown in Figure 3. A decrease in transmittance in the light region and light shielding due to reflection of near-infrared and infrared rays by the heat-reflecting film were confirmed at the same time. Moreover, the results of measuring this reflection characteristic (incidence angle of 10 degrees) from the ultraviolet to the infrared portions are shown in FIG. The results of the measurements revealed that the infrared reflective sheet significantly reflects not only infrared rays but also ultraviolet rays. The light that passes through the infrared reflective sheet also has extremely low levels of ultraviolet rays. Therefore, as described above, the laminate must be constructed in such a way that light passes through the photochromic layer and then the infrared reflective sheet. The reason for this is that the coloring reaction of photochromic compositions generally occurs in response to ultraviolet rays, so when light is transmitted from the infrared reflective sheet side, the ultraviolet rays are blocked and no coloring occurs.

Example 2 This example shows an example in which the present invention is applied to curved glass used in automobile windows.

First, as shown in FIG. 5, a polyvinyl butyral sheet 2 containing the same photochromic composition as that used in Example 1 and a transparent heat ray reflective sheet were placed inside the outside glass 5 for an automobile. 4. The polyvinyl butyral sheet 3 and the interior glass 6 were sequentially laminated and thermocompression bonded in the same manner as in Example 1 to obtain a phlocytoglass for an automobile. If it is a flat plate, even if you change the order of the two or three polyvinyl butyral sheets shown in Figure 1, the rubbing will be the same when turned over.For curved glass for automobiles,
Unless the layers are laminated in the order shown in FIG. 5, the light shielding effect in the visible range due to photochromism cannot be obtained.

(Effects of the Invention) As explained above, according to the present invention, the structure is composed of two transparent sheets sandwiched between at least two transparent supports, and the side on which light enters is transparent. The laminate is characterized by containing a photochromic composition in the sheet or by providing a photochromic layer, and sandwiching a transparent sheet with a heat ray reflecting function on the back side of the sheet, so that it is possible to block light in the visible region by coloring the photochromism. The infrared reflective sheet can simultaneously block infrared light.

In addition, pigments, dyes, and ultraviolet absorbers, which cannot be present simultaneously with the photochromic composition from the viewpoint of reducing the light resistance and colorability of photochromism, are contained in the transparent sheet 3 because they are present through the heat ray reflective sheet. This makes it possible to incorporate it into the laminate, and has the effect of widening the range of coloring options for the laminate.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a photochromic laminate as an example of the present invention, FIG. 2 is a sectional view showing the layer structure of an infrared reflective sheet, and FIG. 3 is a spectral characteristic diagram of transmittance of the laminate shown in FIG. 1. , FIG. 4 is a spectral characteristic diagram of the reflectance of the laminate shown in FIG. 1, FIG. 5 is a cross-sectional view of another example of the photochromic laminate of the present invention when used in a curved glass for automobiles, etc., and FIG. The figure is a cross-sectional view of a conventional photochromic laminate, and FIG. 7 is a spectral characteristic diagram of the transmittance of the laminate shown in FIG. 1...Transparent support 2...Transparent sheet containing photochromic composition 3...Transparent sheet 4...Transparent infrared reflecting sheet 5...Outdoor side glass 6...Indoor side glass first Figure 2 Figure 3 Ronin (nm) Figure 4 Figure 51 Article 1 nm)

Claims (1)

[Claims] 1. At least two transparent supports, two transparent sheets sandwiched between the two transparent supports, and at least one layer sandwiched between the two transparent sheets having a heat ray reflecting function. 1. A photochromic laminate comprising a transparent heat ray reflecting sheet with layers, and one of the transparent sheets on the side into which light enters contains a photochromic composition or has a photochromic layer.