JPS626227A - Optical variable type laminate - Google Patents

Abstract

PURPOSE:To obtain the titled ideal laminate suitable to use to a sun roof of an automobile or a window glass without hardly affecting a surrounding temperature by providing a layer composed of an optical variable substrate which changes a color by irradiating the light, and a heat variable substance which changes a color by heating it, on a substrate. CONSTITUTION:The titled laminate is composed the optical variable substance capable of changing the color by irradiating the light, and the heat variable substance capable of changing the color by heating it. Namely, the constituent of the titled laminate is a thermochromic material which is a colorless and a transparent at a low temp. to a room temp. and is colored at a high temp. The photochromic material is not specified to a dithizone compds. such as a mercury dithizone complex and a zinc dithizone complex, and may be comprised all other photochromic material such as a spirovilan and a viologen compds.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a light-variable laminate whose light transmittance changes when exposed to light.

(Prior Art) As a conventional optically variable laminate, there is one shown in FIG. 2, for example. In this method, a nylon film 5 coated with a photochromic material in advance is laminated between inorganic glasses la and lb with intermediate layers 2a and 2b of polyvinyl butyral interposed therebetween.

(Problems to be Solved by the Invention) However, in such conventional optically variable laminates, the equilibrium position of darkening → fading of the photochromic material is due to the fading side at high temperatures (40'C or higher). Therefore, there was a problem that coloring did not occur at high temperatures, making it undesirable to apply to window shades and sunroofs.

(Means for Solving the Problems) This invention was made by focusing on such conventional problems, and as a constituent of a laminate, it is colorless and transparent at low to normal temperatures, but becomes colored at high temperatures. The above problems are solved by using a thermochromic material.

That is, the present invention provides an optically variable laminate having a layer consisting of an optically variable material that changes color when exposed to light and a thermally variable material that changes color when heat is applied.

In this invention, the photochromic material is not limited to dithizone-based materials such as mercury dithizone complexes and zinc dithizone complexes, but also includes spiropyran-based materials, viologen-based materials, etc.
All other 7 otochromic materials can be applied.

Further, the film for coating the photochromic material is not limited to nylon, polyester film, etc., and any film can be used.

In this invention, vanadium oxide is preferred as the thermochromic material, and more preferably the following general formula; There are compounds represented by a halogen atom, a nitro group, an alkyl group having 1 to 8 carbon atoms, or an alkoxy group, or derivatives thereof. Further, part or all of the benzene ring in this formula can be substituted with a naphthalene ring or a derivative thereof.

(Function) When a dithizone complex of the following formula is used as a photochromic material, for example, the color changes from amber to gray-blue when exposed to light. However, since the equilibrium position of darkening → fading at high temperatures is on the fading side, as shown in Figure 3, in conventional products using only this complex, the amount of change in light amount at 60°C is half of the initial amount of change in light amount. It falls below, making it difficult to put it into practical use.

On the other hand, in the product of the present invention, which uses the above complex and is coated with a thermochromic material such as vanadium oxide, the vanadium oxide changes from transparent to gray-blue at 50°C, so the overall appearance is shown in Figure 8. like 60℃
Even with the above, it is possible to maintain a change in the amount of light, and it is possible to obtain an ideal photochromic sunroof or shade band that changes color even at high temperatures.

(Example) This invention will be described by way of example with reference to the drawings.O Example 1 FIG. 1 shows an optically variable laminate as an example of this invention. In this laminate, a nylon film 8 coated with a mercury dithizone complex having the above structure was laminated in accordance with a conventional method, with an intermediate layer of polyvinyl butyral za and 2b interposed between inorganic glasses la and lb.

However, the inner surface of the glass 1 was coated in advance with a modified vanadium layer 4 which is a thermochromic material.

The coating method was to coat glass plate 1 with 8 parts of vanadium l-propylate Xi, 2-propylate, and V10014#.
Flowcoating was carried out at room temperature with a solution containing J49/l. Next, hydrolysis was performed in air. Thereafter, the coated glass was kept at 875°C for 1 minute in hydrocarbon vapor obtained by heating a bath of Oaliflu In this way, vanadium oxide coated glass was obtained.

Example 2 Another example of the optically variable laminate of the present invention shown in FIG. 4 was produced in the same manner as in Example 1. However, in this example, a polyester film 6 coated with a zinc dithizone complex was used instead of the nylon film coated with a mercury dithizone complex. The zinc dithizone complex is represented by the following formula:

As the thermochromic material 7, a material represented by the following formula was used.

In the case of zinc dithizone, it changes from amber to reddish-purple when exposed to light, and the thermochromic material changes from colorless to reddish-purple at 40°C, so the color change at high temperatures is compensated for. This effect is shown in FIG.

Examples 8 to 8 Other laminates using thermochromic layers and photochromic layers according to the present invention may be constructed as shown in FIGS. 6 to 11.

In FIG. 6, a thermochromic layer 10 and an otochromic layer 8 are provided on both sides of a transparent body 9.

In FIG. 7, hard coat layers 11 are provided on both sides of the laminate shown in FIG. 6.

In FIG. 8, a mixed layer 12 of seven otochromic layers and a thermochromic layer is laminated on a transparent body.

In FIG. 9, a hard coat layer 11 is provided on the mixed layer of the laminate shown in FIG.

In FIG. 10, a thermochromic layer 10 and an otochromic layer 8 are provided inside each of the transparent bodies 9a and 9b, and these are laminated with an adhesive JiF 18 interposed therebetween.

In FIG. 11, a thermochromic layer and a photochromic layer are attached to a transparent film 14 in advance by coating or dyeing, and the film 14 is sandwiched between two transparent bodies 9a and 9b. be.

In addition, the present invention is applicable to all optically variable bodies having a thermoquamic layer in the structure.

(Effects of the Invention) As explained above, in this invention, a thermochromic material that is colored at high temperatures is used in a part of the structure of the light variable body, so that coloring by the 7 otochromic material at low temperatures and coloring at high temperatures This complementary relationship with coloring using a thermochromic material makes it possible to produce an ideal optically variable laminate that is unaffected by ambient temperature and is suitable for window glass and automobile sunroofs.

In addition, by applying a vanadium oxide coating in particular, the vanadium oxide coating has a temperature-dependent switching effect on infrared rays, so that the effect of cutting off infrared rays at high temperatures can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an optically variable laminate as an example of the present invention, FIG. 2 is a partial sectional view of a conventional optically variable laminate, and FIG. 8 is a partial sectional view of an optically variable laminate shown in FIG. 1. A diagram showing the relationship between body color change and ambient temperature, FIG. 4 is a partial cross-sectional view of another example of the optically variable laminate of the present invention, and FIG. 5 is a diagram showing the optically variable laminate shown in FIG. 4. A diagram showing the relationship between body color change and ambient temperature, and FIGS. 6 to 11 are partial cross-sectional views of an example of a light-variable laminate to which the present invention can be applied. 1a, lb...Inorganic glass 2a, 2b-...Polyvinyl butyral intermediate layer 8...
Nylon film coated with mercury dithizone complex 4... Vanadium oxide layer 6... Nylon film coated with photochromic material 6... Polyester film coated with zinc dithizone complex 7... Thermochromic material 8... Photochromic Layers 9a, 9b...Transparent body 10...Thermochromic layer 11...Hard foot layer 12...Mixed layer 18-...Adhesive layer 14...Film patent coated with photochromic material and thermochromic material Applicant: Nissan Motor Co., Ltd. Figure 1 2) Figure 2 Candlelight Figure 4 Figure 5 Shuuri L71 ('C) Figure 7 Procedural Amendment August 27, 1985 1, Case Indication Showa 1960 Patent Application No. 144442 2 Name of the invention Optically variable laminate 3 Relationship to the amended person case Patent applicant (899) Nissan Motor Co., Ltd. 1 Specification page 2 line 19 “Viologen-based etc.” to “Viologen-based, Indololusvironast oxazine-based, etc.”
Correct to.

Claims (1)

[Claims] 1. An optically variable laminate having a layer consisting of an optically variable material that changes color when exposed to light and a thermally variable material that changes color when heat is applied.