JP3147830U - Reversible thermochromic hologram laminate - Google Patents

Abstract

Provided is a reversible thermochromic hologram laminate having a variety of color effects that allows a color change of a reversible thermochromic layer to be clearly seen through a hologram image when viewed from the hologram layer side. A reversible thermochromic hologram laminate 1 in which a reversible thermochromic layer 3 and a transparent hologram layer 2 are laminated, wherein the reversible thermochromic layer 3 has a color difference between complete color development and complete decoloration. ΔE is 30 or more. The light transmittance of the transparent hologram layer 2 is 50% or more. The reversible thermochromic layer 3 encloses a reversible thermochromic composition comprising an electron-donating color-forming organic compound, an electron-accepting compound, and an organic compound medium that reversibly causes a color reaction between the two. Comprising a microcapsule pigment. [Selection] Figure 1

Description

  The present invention relates to a reversible thermochromic hologram laminate. More specifically, the present invention relates to a reversible thermochromic hologram laminate capable of clearly recognizing a visual effect comprising a color change accompanying a temperature change of a reversible thermochromic layer and a hologram effect.

Conventionally, with respect to a reversible thermochromic laminate exhibiting a holographic tone, there are several such as a laminate of a reversible thermochromic layer on a hologram layer, a laminate of a reversible thermochromic layer and a transparent hologram layer in order on a support, etc. (See, for example, Patent Documents 1 and 2).
In the above proposal, a layer in which a reversible thermochromic layer is laminated on a hologram layer obtains a hologram effect by changing the color of the reversible thermochromic layer due to temperature change on the hologram layer, and a reversible thermochromic layer on a support. And a transparent hologram layer laminated in order, the reversible thermochromic layer changes color due to temperature change, so that the color tone of the visible hologram image changes and a unique visual effect is obtained. It has various visual effects due to discoloration.
However, in the laminate, when a color change is viewed from the transparent hologram layer side, the color change of the reversible thermochromic layer may be difficult to visually recognize due to the visual effect of the hologram image depending on the viewing angle and the applied hologram. .
Description and drawings of Japanese Utility Model Publication No. 3-24676 JP-A-8-76674

  The present invention aims to provide a reversible thermochromic hologram laminate having a variety of color effects that can clearly see the color change of the reversible thermochromic layer via a hologram image when viewed from the hologram layer side. Is.

The present invention is a reversible thermochromic hologram laminate formed by laminating a reversible thermochromic layer and a transparent hologram layer, and has a color difference ΔE of 30 or more when the reversible thermochromic layer is completely colored and completely decolored. It is a requirement that
Furthermore, the light transmittance of the transparent hologram layer is 50% or more, and the reversible thermochromic layer is capable of reversing the color reaction between the electron-donating color-forming organic compound and the electron-accepting compound. And a microcapsule pigment encapsulating a reversible thermochromic composition comprising an organic compound medium to be generated.

  According to the present invention, when viewed from the hologram layer side, a reversible thermochromic hologram laminate having excellent decorativeness and a color effect expressed by the hologram image and the color change of the reversible thermochromic layer can be obtained. It is done.

As the transparent hologram used in the transparent hologram layer of the present invention, a general-purpose hologram can be applied as long as it has light transparency. For example, a transparent hologram forming layer (particularly made of a transparent resin) provided with a fine uneven pattern. ), A relief hologram that forms a transparent reflection layer (a thin film made of a metal, a metal compound, or the like) on the surface of the concavo-convex pattern, a volume hologram (Lippmann hologram), or the like can be exemplified. In particular, a relief hologram is preferably used because of its high convenience and visual effect as a laminate.
The transparent hologram layer is preferably used in the form of a foil, a sheet or the like depending on the purpose, and further, a form in which a fabric is bonded to a sheet can also be applied.

As the transparent hologram layer, those having a light transmittance of 50% or more are preferably used, and more preferably those having a light transmittance of 70% or more.
By using one having a light transmittance of 50% or more, the hue of the reversible thermochromic layer laminated on the lower layer can be clearly seen, and a laminate having more decorativeness can be constructed.
The light transmittance is a value obtained by a general-purpose method for measuring the transmittance in the visible light region.

The reversible thermochromic layer is formed by laminating a part or the entire surface of the transparent hologram layer, and uses a support containing a reversible thermochromic material or a coated support. It is obtained by laminating a reversible thermochromic material on the whole or part of a transparent hologram layer, and imparts a change in appearance due to color development and color change accompanying a temperature change of the reversible thermochromic material.
As the reversible thermochromic material, a material containing a reversible thermochromic composition is used, and the composition is a reaction that reversibly causes a color reaction between an electron-donating color-forming organic compound and an electron-accepting compound. A composition containing the three components of the medium is preferably used. Specific examples include reversible thermochromic compositions described in JP-B-51-35414, JP-B-51-44706, and JP-A-7-186540.
Further, as described in Japanese Patent Publication No. 1-29398 proposed by the present applicant, a highly sensitive reversible thermochromic composition having a hysteresis width of 3 ° C. or less with respect to a color density-temperature curve due to temperature change is mentioned. It is done.
The color changes before and after a predetermined temperature (discoloration point), and only one specific state can exist in the normal temperature range among both states before and after the change. That is, the other state is maintained while the heat or cold necessary to develop the state is applied, but when the heat or cold is no longer applied, the state returns to the state exhibited in the normal temperature range, so-called, This is a type in which the temperature-color density due to temperature change shows a small hysteresis width (ΔH) and changes color.
Also, a temperature-sensitive color-changing color memory composition described in Japanese Examined Patent Publication No. 4-17154 proposed by the present applicant, which changes color with a large hysteresis characteristic, that is, changes in color density due to temperature changes are plotted. The type of color change material that changes the shape of the curved line by following a very different path between when the temperature is raised from the lower temperature side than the color change temperature range and when the temperature is lowered from the higher temperature side than the color change temperature range. And a reversible thermochromic composition having a feature capable of storing and holding a state changed at a temperature below the low temperature side color change point or above the high temperature side color change point in a normal temperature range between the low temperature side color change point and the high temperature side color change point. Things are also effective.

  Further, as a heat-colorable composition, a specific color having a linear or side chain alkyl group having 3 to 18 carbon atoms as an electron-accepting compound proposed by the present applicant, which develops color when heated from a decolored state. Examples include systems to which alkoxyphenol compounds are applied (Japanese Patent Laid-Open Nos. 11-129623 and 11-5973), and systems to which specific hydroxybenzoic acid esters are applied (Japanese Patent Laid-Open No. 2001-105732). . Furthermore, a system to which a gallic acid ester or the like is applied (Japanese Patent Laid-Open No. 2003-253149) can be applied.

The reversible thermochromic composition described above is effective when applied as it is, but it is preferable to use it by encapsulating it in microcapsules. This is because the reversible thermochromic composition can be kept in the same composition under various usage conditions and can exhibit the same effects.
By encapsulating in the microcapsule, a chemically and physically stable microcapsule pigment can be constituted, and the particle size range of 0.1 to 30 μm, preferably 0.5 to 10 μm, satisfies the practicality.
Microencapsulation includes conventionally known interfacial polymerization method, in situ polymerization method, in-liquid curing coating method, phase separation method from aqueous solution, phase separation method from organic solvent, melt dispersion cooling method, air suspension coating Method, spray drying method, etc., which are appropriately selected according to the application. Furthermore, a secondary resin film may be provided on the surface of the microcapsule according to the purpose to impart durability, or the surface characteristics may be modified for practical use.

The thermochromic material is dispersed in a medium containing a binder as a coating film forming material and applied as a coloring material such as ink or paint, and is laminated directly on a transparent hologram layer or laminated on a support such as a sheet. By doing so, a reversible thermochromic layer can be formed. At that time, it is also possible to add a non-thermochromic colorant to the colorant.
The thermochromic material in the above can be contained in the binder in an amount of 0.5 to 40% by weight, preferably 1 to 30% by weight. When the blending amount is less than 0.5% by weight, it is difficult to visually recognize a vivid thermochromic effect. When the blending amount exceeds 40% by weight, it is excessive and a residual color is generated in a decolored state.

  As the binder, a transparent film-forming resin is suitable, and various conventional binders can be applied. Specifically, ionomer resins, isobutylene-maleic anhydride copolymer resins, acrylonitrile-acrylic styrene copolymer resins, acrylonitrile-styrene copolymer resins, acrylonitrile-butadiene-styrene copolymer resins, acrylonitrile chlorinated polyethylene-styrene copolymer resins. , Ethylene-vinyl chloride copolymer resin, ethylene-vinyl acetate copolymer resin, ethylene-vinyl acetate-vinyl chloride graft copolymer resin, vinylidene chloride resin, vinyl chloride resin, chlorinated vinyl chloride resin, vinyl chloride-vinylidene chloride copolymer Resin, chlorinated polyethylene resin, chlorinated polypropylene resin, polyamide resin, high density polyethylene resin, medium density polyethylene resin, linear low density polyethylene resin, polyethylene terephthalate resin, polybutylene Phthalate resin, polycarbonate resin, polystyrene resin, high impact polystyrene resin, polypropylene resin, polymethylstyrene resin, polyacrylate resin, polymethyl methacrylate resin, epoxy acrylate resin, alkylphenol resin, rosin modified phenolic resin, rosin modified alkyd resin, Phenol resin modified alkyd resin, epoxy resin modified alkyd resin, styrene modified alkyd resin, acrylic modified alkyd resin, amino alkyd resin, vinyl chloride-vinyl acetate resin, styrene-butadiene resin, epoxy resin, unsaturated polyester resin, polyurethane resin, acetic acid Vinyl emulsion resin, styrene-butadiene emulsion resin, acrylate emulsion resin, water-soluble alkyd resin, water Sex melamine resins, water-soluble urea resins, water-soluble phenolic resin, water-soluble epoxy resin, water-soluble polybutadiene resins, cellulose acetate, nitrate cellulose, ethyl cellulose and the like.

  The reversible thermochromic layer is a conventionally known method, for example, screen printing, offset printing, gravure printing, coater, tampo printing, transfer printing means, brush coating, spray coating, electrostatic coating, electrodeposition coating, flow coating. It can be formed by means such as roller coating or dip coating.

  The reversible thermochromic layer obtained by forming directly on the transparent hologram layer using the above means or on the transparent support or the non-transparent support is formed on the entire surface and partially (design). It can also be formed.

  The reversible thermochromic layer is not limited to directly forming the thermochromic material on the transparent hologram layer or other support by means of printing, painting or the like, as described above, and the thermochromic material is blended. It is also possible to apply a plastic material obtained by molding a resin or a permeable material such as a cloth impregnated and dried with a thermochromic material. Furthermore, it is also possible to stick between the reversible thermochromic layer and the hologram layer through an adhesive layer.

Further, for the purpose of improving the strength of the laminate or protecting the hologram layer and the reversible thermochromic layer, a transparent resin layer can be provided between the two layers or in the outermost layer.
For the transparent resin layer, various conventional resin films are effective, for example, high-pressure polyethylene film, medium-low pressure polyethylene film, cross-linked polyethylene film, ethylene-vinyl acetate copolymer film, ethylene-acrylate copolymer film, Ionomer film, ethylene-propylene copolymer film, propylene film, vinyl chloride-propylene film, polystyrene film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, fluororesin film, polycarbonate film, acetate film, polyester film, polyamide Examples thereof include a film, a hydrochloric acid rubber film, a polyimide film, a polyurethane film, and a polypeptide film.
The said transparent resin layer can be suitably adjusted and used for the thickness according to the intended purpose, such as a support body and a protective layer.

Moreover, in the structure of the above-described laminate, a light stabilizer layer can be appropriately provided in each layer or outer layer. Specifically, the light stabilizer layer is selected from an ultraviolet absorber, an antioxidant, an anti-aging agent, a singlet oxygen quencher, a superoxide anion quencher, an ozone decolorant, a visible light absorber, and an infrared absorber. The light stabilizer is a layer in which the light stabilizer is fixed in a dispersed state, and the transparent resin layer can be used as a light stabilizer layer.
Furthermore, a colorant, a metal powder, an anti-aging agent, an antistatic agent, a polarity imparting agent, a thixotropic agent, an antifoaming agent, and the like can be added to each layer as necessary to improve the function.

The reversible thermochromic hologram laminate is configured so that the color difference ΔE between the complete color development and the complete color erasure of the reversible thermochromic layer when viewed from the hologram layer side is 30 or more. As a result, the color change due to thermal discoloration can be visually recognized without being hindered by the visual effect of the hologram image, so that the unique color effect expressed by the color change of the hologram image and the reversible thermochromic layer can be clearly seen. .
The color difference ΔE is a value obtained by Hunter's color difference formula defined by JIS Z 8730, ΔE = [(ΔL) ² + (Δa) ² + (Δb) ² ] ^1/2 . Further, L, a, and b in the above formula are indices obtained from tristimulus values defined in JIS Z 8722.

  Further, when the reversible thermochromic layer is formed as an arbitrary character or image, the color difference ΔE from the hologram layer side between the portion where the reversible thermochromic layer is formed and the portion where it is not formed is preferably 30 or more. Thereby, a reversible thermochromic image can be clearly seen.

  Further, a non-thermochromic layer can be formed together with the reversible thermochromic layer. In this case, by setting the color difference ΔE between adjacent reversible thermochromic layers to 30 or more, a reversible thermochromic image can be clearly seen as described above.

Examples are shown below. In addition, the part in an Example represents a weight part.
Tables 1 to 3 show the configuration requirements of each example. Table 1 shows the composition and color change of the microcapsule pigment used in each Example, Table 2 shows the composition and color change of the material used in Examples 1 to 5, and Table 3 shows Examples 6 to 10 The composition and color change of the used material are shown.
Details of the non-thermochromic colorant used in Tables 2 and 3 are as follows.
[SANDAI SUPER BLUE GLL: Aqueous dispersion of blue pigment, pigment content of about 24% by weight, manufactured by Sanyo Dye Co., Ltd., Epocolor FP-1000N: Pink fluorescent pigment, manufactured by Nippon Shokubai Co., Ltd., Epocolor FP-40: orange Fluorescent pigment, manufactured by Nippon Shokubai Co., Ltd., Epocolor FP-117: Yellow fluorescent pigment, manufactured by Nippon Shokubai Co., Ltd.]

Table 4 shows values of color difference ΔE before and after color change and thermal discoloration in each example. The ΔE is a value obtained as follows.
Measurement Method of Color Difference ΔE Before and After Color Change of Reversible Thermochromic Hologram Laminate Samples for measurement of reversible thermochromic hologram laminates obtained in the respective examples and comparative examples are color difference meters [TC-3600 type color difference meter: TEPCO Attached to the measuring part of Color Co., Ltd., and the temperature of the measuring part is 0 ° C. (the reversible thermochromic microcapsule pigment is in a colored state) and 40 ° C. (the reversible thermochromic microcapsule pigment is in a decolored state), Tristimulus values X, Y, and Z at each temperature were measured. Further, using the obtained tristimulus values X, Y, and Z, a color difference ΔE before and after the color change (0 ° C. and 40 ° C.) was calculated by Equations (1) to (4).
ΔE = [(ΔL) ² + (Δa) ² + (Δb) ² ] ^1/2 (1)
ΔE: Color difference in Hunter's color difference formula
ΔL, Δa, Δb: the difference between the brightness index L of the two surface colors and the chromaticness index a, b in the Hunter color difference formula L = 10Y ^1/2 (2)
a = 17.5 (1.02X−Y) / Y ^1/2 (3)
b = 7.0 (Y-0.847Z) / Y ^1/2 (4)
L: Lightness index in Hunter's color difference formula
a, b: chromaticness index in Hunter's color difference formula
X, Y, Z: Tristimulus values in XYZ system

  Moreover, the light transmittance of the transparent hologram film used below was measured by measuring the light transmittance in the visible light region of 380 nm to 800 nm with a spectrophotometer [U-3210 type self-recording spectrophotometer, manufactured by Hitachi, Ltd.]. The average light transmittance in the visible light region was calculated from the integral value of the transmittance spectrum.

Example 1 (see FIG. 1)
Reversible thermochromic microcapsule pigment A encapsulating a reversible thermochromic composition in a wall film material comprising a cured product of aromatic polyisocyanate and aliphatic amine (Table 1, pink at about 15 ° C. or less, about 32 Reversible thermochromic ink a (Table 2, about 15) prepared by adding reversible thermochromic microcapsule pigment C (Table 1, orange at about 15 ° C. or less, colorless at about 32 ° C. or more). Screen printing was performed on white synthetic paper (support 4) using red at a temperature of less than or equal to 0 ° C. and colorless at a temperature of approximately 32 ° C. or more to form a reversible thermochromic layer 3. Furthermore, a transparent hologram film having an adhesive 5 on the back surface (light transmittance of only the transparent hologram film 2: 80%) is laminated on the reversible thermochromic layer by pressing with a roll, and the reversible thermochromic hologram laminate 1 is obtained. Got.
The laminate 1 exhibits a holographic red color at a temperature of about 15 ° C. or lower, and maintains this state even when heated from this state to a temperature of less than about 32 ° C., but is about 32 ° C. or higher. When the temperature reached, it turned white with a holographic tone. When cooled again from this state, the hologram-like white state is maintained up to about 15 ° C., but at a temperature of about 15 ° C. or less, the hologram-like red color is obtained again. The discoloration behavior was clearly visible and could be reproduced repeatedly. In addition, when the color was partially changed by touch with a holographic tone red color, the contrast between the discolored portion and the undiscolored portion was good, and the discolored portion was clearly visible.
The color difference ΔE before and after thermal discoloration of the laminate 1 was 38.6 (Table 4).

Examples 2 to 5 (see FIG. 1)
A reversible thermochromic hologram laminate 1 was produced in the same manner as in Example 1 except that the reversible thermochromic ink a was changed to reversible thermochromic inks b, c, d, and e (Table 2), respectively. These thermochromic hologram laminates 1 can clearly see the discoloration behavior as in Example 1, and the contrast between the discolored portion and the undiscolored portion when partially discolored is also good. The part was clearly visible. Further, the color difference ΔE before and after the thermal discoloration of the thermochromic hologram laminate 1 was 30 or more (Table 4).

Example 6 (see FIG. 2)
Reversible thermochromic microcapsule pigment F containing a reversible thermochromic composition in a wall film material comprising a cured product of an aromatic polyvalent isocyanate and an aliphatic amine (Table 1, orange at about 27 ° C. or less, orange, about 30 ° C. Using the above, reversible thermochromic ink f (Table 3, orange at about 27 ° C. or lower, colorless at about 30 ° C. or higher) was prepared. Next, a 15 denier polyester tricot fabric (support 4) is joined to a transparent hologram film (light transmittance: 80%) with a polyurethane adhesive, and the reversible thermochromic ink f is used on the tricot fabric side. Then, screen printing was performed to obtain a reversible thermochromic hologram laminate 1 having the reversible thermochromic layer 3 on the back surface of the transparent hologram film 2.

When the laminate 1 was viewed from the transparent hologram layer 2 side, it exhibited a holographic orange color at room temperature (25 ° C.), but changed to a holographic white color when heated to a temperature of about 30 ° C. or higher. When cooled from this state, it became a holographic orange again at a temperature of about 27 ° C. or less (Table 4). The discoloration behavior was clearly visible and could be reproduced repeatedly. Further, when a part of the laminate 1 is partially discolored with a finger while the hologram-like orange color is present, the contrast between the discolored portion and the undiscolored portion is good, and the discolored portion is clearly visible. I was able to.
The color difference ΔE before and after thermal discoloration of the laminate 1 (0 ° C. and 40 ° C.) was 35.4 (Table 4).

Examples 7 to 10 (see FIG. 2)
A reversible thermochromic hologram laminate 1 was produced in the same manner as in Example 6 except that the reversible thermochromic ink f was changed to reversible thermochromic inks g, h, i, and j (Table 3), respectively. Each of these thermochromic hologram laminates 1 can clearly see the discoloration behavior as in Example 6, and the contrast between the discolored portion and the undiscolored portion when partially discolored is also good. The discolored portion was clearly visible. In addition, the color difference ΔE before and after thermal discoloration of each thermochromic hologram laminate 1 was 30 or more (Table 4).

Example 11 (see FIG. 3)
On the white synthetic paper (support 4) having the adhesive 5 on the back surface, screen printing was performed using the reversible thermochromic ink c prepared in Example 3 to form a reversible thermochromic layer 3 having a heart pattern. Further, a transparent hologram film having the adhesive 5 on the back surface (light transmittance of the transparent hologram film 2 only: 80%) is laminated on the reversible thermochromic layer 3 by pressing with a roll, and the reversible thermochromic property in a sealed form. A hologram laminate 1 was obtained.

  When the laminate 1 (seal) is cooled to a temperature of about 15 ° C. or lower, a holographic pink heart pattern is visually recognized, and this state is maintained even when heated from this state to about 32 ° C. However, when the temperature reached about 32 ° C. or higher, the holographic pink heart pattern part was erased and the entire surface became holographic white. When cooled from this state, the hologram-like white state was maintained up to about 15 ° C., but at about 15 ° C. or less, the hologram-like pink heart pattern was visually recognized again. The discoloration behavior was clearly visible and could be reproduced repeatedly.

Example 12 (see FIG. 4)
A reversible thermochromic ink prepared in Examples 9 and 10 was joined to a transparent hologram film 2 (light transmittance: 80%) with a 15 denier polyester tricot fabric using a polyurethane adhesive. Using i and j, a two-color butterfly pattern was screen-printed to obtain a reversible thermochromic hologram laminate 1 having a reversible thermochromic layer 3 on the back surface of the transparent hologram film 2.

  The laminated body 1 has a purple and orange two-color butterfly pattern visually recognized together with a hologram effect at room temperature (25 ° C.), and a pink and yellow two-color butterfly when heated to about 30 ° C. or more. This pattern was visually recognized together with the hologram effect. When cooled from this state, a purple and orange two-color butterfly pattern was observed with a hologram effect again at about 27 ° C. or lower. The discoloration behavior was clearly visible and could be reproduced repeatedly.

Comparative example

A comparative example is shown below. In addition, the part in a comparative example represents a weight part.
Tables 5 and 6 show the configuration requirements of each comparative example. Table 5 shows the composition and color change of the materials used in Comparative Examples 1 to 5, and Table 6 shows the composition and color change of the materials used in Comparative Examples 6 to 10.

  Table 7 shows values of color difference ΔE before and after color change and thermal discoloration in each comparative example.

Comparative Examples 1-5
A reversible thermochromic microcapsule pigment used in the examples shown in Table 1 (including a reversible thermochromic composition in a wall film material made of a cured product of an aromatic polyvalent isocyanate and an aliphatic amine) A, Reversible thermochromic inks k, l, m, n, and o were prepared using B and C, respectively (Table 5).
A reversible thermochromic hologram laminate 1 was produced in the same manner as in Example 1 except that the reversible thermochromic ink a was changed to reversible thermochromic inks k, l, m, n, and o, respectively.
Since these thermochromic hologram laminates 1 are influenced by hologram-like visual effects, the discoloration behavior cannot be clearly seen, and the contrast between the discolored portion and the undiscolored portion when partially discolored is not good. It was sufficient, and the discolored part could not be visually recognized clearly. In addition, the color differences ΔE before and after the thermal discoloration of the thermochromic hologram laminate 1 were all 30 or less (Table 7).

Comparative Examples 6-10
Reversible thermochromic microcapsule pigments used in the examples shown in Table 1 (comprising a reversible thermochromic composition with a wall film material comprising a cured product of an aromatic polyvalent isocyanate and an aliphatic amine) D, Reversible thermochromic inks p, q, r, s, and t were prepared using E and F (Table 6).
A reversible thermochromic hologram laminate 1 was produced in the same manner as in Example 6 except that the reversible thermochromic ink f was changed to reversible thermochromic inks p, q, r, s, and t, respectively.
Since these thermochromic hologram laminates 1 are influenced by hologram-like visual effects, the discoloration behavior cannot be clearly seen, and the contrast between the discolored portion and the undiscolored portion when partially discolored is not good. It was sufficient, and the discolored part could not be visually recognized clearly. Moreover, all the color differences ΔE before and after the thermal discoloration of the thermochromic hologram laminate were 30 or less (Table 7).

It is a cross-sectional view which shows the Example of the reversible thermochromic hologram laminated body of this invention. It is a cross-sectional view showing another embodiment of the reversible thermochromic hologram laminate of the present invention. It is a cross-sectional view showing another embodiment of the reversible thermochromic hologram laminate of the present invention. It is a cross-sectional view showing another embodiment of the reversible thermochromic hologram laminate of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reversible thermochromic hologram laminated body 2 Transparent hologram layer 3 Reversible thermochromic layer 4 Support body 5 Adhesive layer

Claims (3)

  A reversible thermochromic hologram laminate formed by laminating a reversible thermochromic layer and a transparent hologram layer, wherein the reversible thermochromic layer has a color difference ΔE between full color development and complete decoloration of 30 or more. A reversible thermochromic hologram laminate.   The reversible thermochromic hologram laminate according to claim 1, wherein the transparent hologram layer has a light transmittance of 50% or more.   The reversible thermochromic layer includes a micro that encloses a reversible thermochromic composition comprising an electron-donating color-forming organic compound, an electron-accepting compound, and an organic compound medium that reversibly causes a color reaction between the two. The reversible thermochromic hologram laminate according to claim 1 or 2, comprising a capsule pigment.

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