JPH11128532A - Reversible thermal color change puzzle and puzzle set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a puzzle set of having a fine contrast of a visual image, a surprise and a fun of color changing by using a reversible thermal color change puzzle that has a reversible thermal color change layer which changes its color reversibly by temperature change on a piece of puzzle and setting a value of color at specific area on a piece of puzzle. SOLUTION: It is printed an illustration of pheasant on the white base paper which has the value of color 9.0, thickness 3 mm using a reversible thermal color change screen ink containing a micro capsule pigment containing a reversible thermal color change composition which indicates blue, when it is under 15 deg.C and indicates colorless, when it is 15 deg.C or over, using a pigment which indicates green, when it is under 15 deg.C and indicates colorless, when it is 15 deg.C or over and using a pigment which indicates red, when it is under 15 deg.C and indicates colorless, when it is 15 deg.C or over. It is printed flowers around the base paper with green and brown ink. At the normal temperature, it is drawn the flowers at the edge part. When it touches the transparent vessel with full of cold water at 5 deg.C, as the color changing tool, to the face of the puzzle, the illustration of pheasant comes at the center of it with fine blue, green and red color. In general, the value of color on the piece of puzzle is set a light color in 4 to 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a reversible thermochromic puzzle and a reversible thermochromic puzzle set using the same.
More specifically, reversible thermochromic puzzles in which images different from each other can be visually recognized due to temperature changes, and excellent in contrast in the color tone of each image, and a reversible thermochromic puzzle obtained by combining the reversible thermochromic puzzle with a heating or cooling thermochromic device Related to discoloration puzzle sets.

[0002]

2. Description of the Related Art Conventionally, there has been disclosed a jigsaw puzzle in which a color or a pattern changes with a change in temperature (Japanese Utility Model Laid-Open No. 5-28388). The above-described conventional jigsaw puzzle forms a thermochromic pattern using a thermochromic ink that changes color at a predetermined temperature, and the configuration in which the pattern changes color by a temperature change, or the thermochromic pattern on a non-color-changing pattern. Is disclosed, and another symbol appears by a temperature change. However, in the above-mentioned puzzle, even if a puzzle in which the color tone of a symbol changes due to a temperature change or a puzzle in which the symbol changes can be obtained, in a system in which the symbol changes color, the lower layer of the symbol has a relatively dark color. In some cases, even when the thermochromic ink shows a color-developed state and the pattern appears, the lower layer color tone is transmitted, so the pattern color and the lower layer color tone are mixed, resulting in a relatively dark color pattern. , Cannot see a clear pattern. Further, in a system in which another symbol appears due to a temperature change in which a thermochromic symbol is formed on a non-chromatographic symbol, the thermochromic symbol is a thermochromic symbol when the non-chromatographic symbol is dark. Sufficient color density is required to hide the non-discoloring pattern. Therefore, the image appearing in the thermochromic pattern in either the color-developed state or the decolored state is dark and has poor color tone contrast.

[0003]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problem of the conventional puzzle,
In other words, the reversible thermochromic layer provided on the puzzle has an excellent contrast between an image viewed in a color-developed state and an image viewed in the decolorized state of the reversible thermochromic layer, and has a surprising and rich taste of reversible heat. An object of the present invention is to provide a discolorable puzzle and a reversible thermochromic puzzle set using the same.

[0004]

The present invention provides: A reversible thermochromic puzzle provided with a reversible thermochromic layer that reversibly changes color by temperature change directly or through a colored layer on a puzzle piece, wherein the brightness value of the puzzle piece or the puzzle piece provided with the colored layer is A reversible thermochromic puzzle that is 4 to 10. 2. The reversible thermochromic layer forms an image, and the brightness value of the puzzle piece or the puzzle piece provided with the colored layer is 5 to 10
2. The reversible thermochromic puzzle according to item 1, wherein 3. The puzzle piece provided with the colored layer has a lightness value of 4 to 10
Is formed, the reversible thermochromic layer is a layer that conceals the colored image having a brightness value of 1 to 5 at the time of color development, and
The reversible thermochromic puzzle according to claim 1, wherein the lightness value of the reversible thermochromic layer at the time of coloring is smaller than the lightness value of the colored image. 4. The reversible thermochromic puzzle according to any one of claims 1 to 3, wherein the puzzle is a jigsaw puzzle. 5. The reversible thermochromic layer contains a reversible thermochromic composition containing three components of an organic compound medium that reversibly causes a color reaction between the electron-donating color-forming organic compound and the electron-accepting compound in the reversible thermochromic layer. 5. The reversible thermochromic puzzle according to any one of items 4 to 5. 6. A reversible thermochromic puzzle set, comprising a heating or cold discoloration tool containing hot water, cold water, or ice chips as a heating or cold heat source, and a puzzle according to any one of items 1 to 5. It is characterized by.

[0005] The material of the puzzle is not particularly limited, but paper and synthetic paper are preferably used. Also, rubber,
Plastic, leather, wood, and the like can be used.
In addition, the puzzle is used by sticking the same material,
Those of different materials can be bonded together.
In the present invention, as a heating or cooling discoloration tool for discoloring a reversible thermochromic puzzle, an energizing heating discoloration tool equipped with a resistance heating element (Japanese Utility Model Laid-Open No. 62-139573 and Japanese Utility Model Application Laid-Open No. 4-50100). , A heating pen (Japanese Utility Model Laid-Open No. 2-106299) and a heating stamp filled with hot water, etc.
Cooling discoloring device using Peltier element (Japanese Patent Laid-Open No. 5-318)
No. 915), a cooling pen or a cooling stamp filled with cold water, ice chips, or the like. Preferably, a hot or cold water discoloring tool for filling hot water, cold water, or ice chips with a simple structure and usage method is used. Can be By combining the heating or cooling discoloration tool for filling hot water, cold water, or ice pieces with the reversible thermochromic puzzle of the present invention, a reversible thermochromic puzzle set excellent in playability can be obtained. Further, a liquid such as water may be applied directly on the puzzle, or the puzzle may be immersed in the liquid. Therefore, when the puzzle is formed of a poorly water-resistant material such as paper, water resistance is reduced. It is preferable to provide. In order to impart water resistance to the puzzle, a method of providing a water-resistant top coat layer on the surface, a method of covering the puzzle with a film, a method of applying a water repellent, or a resin having a water resistance is used. Impregnated and fixed. Examples of the form of the puzzle include one consisting of a plurality of puzzle pieces only, and one consisting of a plurality of puzzle pieces and a mount on which the puzzle pieces are fitted. In addition, the puzzle surface may have not only a flat surface but also an uneven surface in order to provide three-dimensionality by fitting.

The coloring agent contained in the coloring layer includes:
General colored dyes, pigments, or fluorescent dyes, pigments are used, if desired, pearl pigments, metal powder pigments, luminous pigments,
White pigments such as titanium dioxide can also be used. The coloring agent is dispersed in a binder which is a film forming material, and is applied as a coloring material such as ink or paint to form a coloring layer. The coloring layer is provided on the puzzle piece as required, and the entire surface of the puzzle can be colored with the same color, and a pattern can be formed as appropriate. Further, it is preferable to use a plurality of colors in combination in order to form a colorful design.

The reversible thermochromic composition contained in the reversible thermochromic layer includes a three-component organic compound medium which reversibly causes a color reaction between an electron-donating color-forming organic compound and an electron-accepting compound. A reversible thermochromic composition containing is preferably used. Specifically, Japanese Patent Publication No. 51-35414,
JP-B-51-44706, JP-B-51-4470
No. 8, Japanese Patent Publication No. 52-7774, Japanese Patent Publication No. 1-1
No. 7,154, JP-B-1-29398, JP-A-7-186546, and the like.
The color changes before and after a predetermined temperature (discoloration point) as a boundary, and only one specific state can exist in a normal temperature range between the two states before and after the change. That is, the other state is maintained while the heat or cold required for the state to appear is applied, but returns to the state exhibited in the normal temperature range when the heat or cold is no longer applied, so-called, Temperature due to temperature change
This is a type in which the color density is changed to show a small hysteresis width (ΔH).

Also, Japanese Patent Publication No. 4-171 proposed by the present applicant.
No. 54, JP-A-7-179777, JP-A-7-179777
The thermosensitive color-changing color memory composition which exhibits large hysteresis characteristics and discolors described in, for example, JP-A-339997, that is, the shape of a curve plotting a change in coloring density due to a temperature change indicates a temperature in a discoloration temperature range. A type of discoloring material that changes color following a significantly different path when the temperature is increased from a lower temperature side and conversely when the temperature is decreased from a higher temperature side than the discoloration temperature. A reversible thermochromic composition having a characteristic of being able to memorize and retain a state changed at a temperature below the low-temperature side discoloration point or above the high-temperature side discoloration point in a normal temperature range between the points is also effective.

Although the above-mentioned reversible thermochromic composition is effective even when applied as it is, it is preferable to use it as a microcapsule pigment encapsulated in microcapsules.
This is because the reversible thermochromic compositions are maintained under the same composition under various conditions of use, and can exhibit the same effects. By being encapsulated in the microcapsules, a chemically and physically stable pigment can be constituted, and the range of particle diameter of 0.1 to 100 μm, preferably 1 to 50 μm, more preferably 2 to 30 μm satisfies practicality.
The microencapsulation is carried out by a 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, melting dispersion cooling method, air suspension. There are coating method, spray drying method, etc.
It is appropriately selected according to the application. Further, a secondary resin film may be further provided on the surface of the microcapsule according to the purpose to impart durability, or the surface characteristics may be modified for practical use.

[0010] The reversible thermochromic composition may be a vinyl chloride-vinyl acetate copolymer resin, a hindered amine compound selected from piperidine derivatives, a vinyl chloride-vinyl acetate-vinyl alcohol copolymer, a vinyl chloride-vinylidene chloride copolymer. A polymer or the like blended vinyl chloride-vinyl acetate copolymer resin is fixed in a dispersed state in a matrix to form a colored layer, or the reversible thermochromic material is finely divided into a saturated copolymerized polyester resin matrix. It is also possible to form a reversible thermochromic layer by dispersing.

The reversible thermochromic composition or the microcapsule pigment containing the same is dispersed in a medium containing a binder which is a film-forming material and applied as a coloring material such as ink or paint. Can be formed.

The reversible thermochromic composition and the microcapsule pigment containing the same are contained in a resin binder in an amount of 0.5%.
７０70% by weight, preferably 1-50% by weight. If the amount is less than 0.5% by weight, it is difficult to see a clear thermal discoloration effect, and if it exceeds 70% by weight, durability and adhesion between layers may be impaired. The reversible thermochromic layer is provided directly on the puzzle piece or via a colored layer, and the entire surface of the puzzle can be colored with the same color, and a pattern can be formed as appropriate. Also, a plurality of colors can be used in combination to form a colorful pattern.

As the binder, various binders including a transparent film-forming resin can be used, and examples of the film-forming resin are shown below. Ionomer resin, isobutylene-maleic anhydride copolymer resin, acrylonitrile-acrylic styrene copolymer resin, acrylonitrile-styrene copolymer resin, acrylonitrile-butadiene-styrene copolymer resin, acrylonitrile chlorinated polyethylene-styrene copolymer resin, 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 terephthalate Fat, polycarbonate resin, polystyrene resin, high impact polystyrene resin, polypropylene resin, polymethylstyrene resin, polyacrylate resin, polymethylmethacrylate resin, epoxy acrylate resin, alkylphenol resin, rosin-modified phenolic resin, rosin-modified alkyd resin, phenol Modified alkyd resin, epoxy-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, vinyl acetate emulsion resin, styrene-butadiene emulsion resin, acrylate emulsion resin,
Water-soluble alkyd resin, water-soluble melamine resin, water-soluble urea resin, water-soluble phenol resin, water-soluble epoxy resin, water-soluble polybutadiene resin, cellulose acetate, cellulose nitrate, ethyl cellulose and the like can be mentioned.

The reversible thermochromic layer and the colored layer are formed by a conventionally known method, for example, printing means such as screen printing, offset printing, gravure printing, coater, tampo printing, transfer, brush coating, spray coating, electrostatic coating. , Electrodeposition coating, flow coating, roller coating, dip coating and the like.

According to the present invention, a lightness value of a puzzle piece located under a reversible thermochromic layer or a puzzle piece provided with a coloring layer is set to 4 to 1.
Set to a relatively bright color of 0. Therefore, when the reversible thermochromic layer shifts from the colored state to the erased state or from the erased state to the colored state, the perceived color change is made larger, giving the puzzle great variability. In this case, an image is formed by the reversible thermochromic layer, the image is concealed by a temperature change, and the colored image is concealed by a reversible thermochromic layer, and the reversible thermochromic layer develops and decolors by the temperature change. In a configuration in which a colored image is hidden, the set brightness value differs. More specifically, in the case of a system in which an image is formed by a reversible thermochromic layer and the image is hidden by a change in temperature, a puzzle piece located below the reversible thermochromic layer or a puzzle piece provided with a coloring layer has a lightness. The value is 5-10, preferably 6-10. Therefore,
When the reversible thermochromic image is in the color-developed state by setting the lightness value in the above-described range, a bright color tone image can be visually recognized even if the color tone is mixed with the lower layer color tone. The color tone of the puzzle piece located below the reversible thermochromic image or the puzzle piece provided with the coloring layer may be a single color, a single color or a plurality of colors as long as the brightness value is within the above-described range. It may be a pattern composed of colors. Furthermore, in the case where the puzzle piece provided with the colored layer is a pattern composed of a single color or a plurality of colors, even if the puzzle piece provided with the colored image has a portion outside the range of the lightness value, it is partially pointed. When the reversible thermochromic layer is in a color-developed state, it does not prevent a bright color image from being visible if it is present, has a thin linear shape, or has an image outline.

In a system in which a colored image is concealed by a reversible thermochromic layer, and the reversible thermochromic layer develops and decolors due to a change in temperature so that the colored image is concealed, the puzzle piece provided with the colored image has a lightness. The value is 4 to 10, the reversible thermochromic layer has a color value of 1 to 5, and the reversible thermochromic layer has a color value of 1 to 5. Less than. Therefore, by setting the brightness value in the above-described range, the concealability of the puzzle piece provided with the colored image can be sufficiently satisfied, and the reversible thermochromic layer can have a relatively bright color tone. The puzzle piece provided with the colored image preferably has a variety of colors, but since the outline of the image or the like may use a relatively dark color, even if there is a portion outside the range of the lightness value. If it is partial, thin linear, or the outline of an image, hiding by the reversible thermochromic layer does not visually hinder.

Incidentally, the lightness value is manufactured by Tokyo Denshoku Co., Ltd.
This is a value measured using a TC-3600 color difference meter, and an image is formed by coating a non-color-changing ink or a reversible thermochromic ink on a support having a brightness value equivalent to that of a puzzle piece actually used. Measured. For the image formed by applying the reversible thermochromic ink, each lightness value in the color development state of the image is measured.

Furthermore, a metallic gloss layer may be provided on the reversible thermochromic layer of the reversible thermochromic puzzle of the present invention to make the color change versatile. As the metallic gloss pigment contained in the metallic gloss layer, conventionally known titanium dioxide-coated mica, iron oxide-titanium dioxide-coated mica, iron oxide-coated mica,
Metallic luster pigments such as guanine, sericite, basic lead carbonate, lead acid arsenate, bismuth oxychloride and the like can be mentioned.

In the configuration of the reversible thermochromic puzzle described above, a protective layer and a light stabilizer layer may be appropriately provided. Specifically, the light stabilizer layer is selected from an ultraviolet absorber, an antioxidant, an antioxidant, a singlet oxygen quencher, a superoxide anion quencher, an ozone decolorant, a visible light absorber, and an infrared absorber. This is a layer in which the light stabilizer is fixed in a dispersed state. The function can be improved by adding an antioxidant, an antistatic agent, a polarity imparting agent, a thixotropic agent, an antifoaming agent, etc. to the reversible thermochromic layer and the metallic luster pigment layer as required.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The reversible thermochromic puzzle of the present invention comprises:
This is a puzzle having a configuration in which puzzle pieces having the same shape or different shapes are fitted together, and is used not only in a planar fitting puzzle but also in a three-dimensional fitting puzzle having irregularities in the puzzle piece. Furthermore, it is suitably used for jigsaw puzzles.

[0021]

Examples are shown below. Example 1 (See FIGS. 1, 2, and 3) The central part of a 30 cm × 40 cm white base paper (thickness: 3 mm) having a lightness value of 9.0 shows blue below 15 ° C. and colorless above 15 ° C. A reversible thermochromic screen ink containing a microcapsule pigment containing a reversible thermochromic composition, 15
A reversible thermochromic screen ink containing a microcapsule pigment enclosing a reversible thermochromic composition containing a green color below 15 ° C. and colorless above 15 ° C., a reversible thermochromic color showing a color below 15 ° C. and a colorless above 15 ° C. The pheasant pattern was printed using each of the reversible thermochromic screen inks containing the microcapsule pigment containing the composition, and the reversible thermochromic layer 3 was formed. Further, an image of a flower is printed on the periphery of the base paper using green ink and brown ink. The base paper provided with the reversible thermochromic layer was cut into a plurality of puzzle pieces 2 to obtain a reversible thermochromic puzzle 1. The puzzles were cut into jigsaw puzzles each having the same shape.

When the puzzle pieces are fitted together to complete the puzzle, an image of a flower is drawn at the periphery in the normal temperature range, and a blank pattern is visually recognized at the center. When a transparent container filled with 5 ° C. cold water as a discoloration tool is brought into contact with the puzzle surface, bright blue, green and red pheasant patterns appear at the center. The pheasant symbol disappears when the temperature reaches 15 ° C. or higher, and appears when cooled to a temperature lower than 15 ° C. again. In addition, this aspect change could be repeatedly performed.

Example 2 On the entire surface of a base paper (thickness: 5 mm) of 20 cm × 30 cm,
Using a yellow ink, a red ink, a brown ink, a green ink, and a blue ink, a pattern of a house and a background was printed to form a colored layer. The design of the window of the house was colored with yellow ink, and the lightness value was 8.5.

A reversible thermochromic screen ink containing a microcapsule pigment enclosing a reversible thermochromic composition showing red at less than 15 ° C. and colorless at 15 ° C. or more in the pattern portion of the window, and green at less than 15 ° C. A flower pattern was printed using a reversible thermochromic screen ink containing a microcapsule pigment enclosing a reversible thermochromic composition that was colorless at 15 ° C. or higher to form a reversible thermochromic layer. The base paper provided with the coloring layer and the reversible thermochromic layer was cut into a plurality of puzzle pieces to obtain a reversible thermochromic puzzle.

When the puzzle pieces are fitted together to complete the puzzle, in the normal temperature range, the house and the background, which are not displayed at all, are visually recognized in the window design. When a transparent container filled with ice as a discoloration tool is brought into contact with the design of the puzzle window, bright red and green flower patterns appear. The flower pattern disappears at a temperature of 15 ° C. or higher, and appears when cooled to a temperature lower than 15 ° C. again.
In addition, this aspect change could be repeatedly performed.

Example 3 (see FIGS. 4, 5 and 6) On a 40 cm × 50 cm white base paper (2 mm thick), yellow ink, red ink and green ink were used, respectively.
The colored layer 3 was formed by printing a flower bud pattern. In the picture portion of the flower bud, the brightness value of the portion printed with yellow ink is 8.4, the brightness value of the portion printed with red ink is 5.5, and the brightness value of the portion printed with green ink. Was 5.3.

On the flower bud pattern, a thermochromic color memory composition [purple (lightness 3.0) at 15 ° C. or less, 3
5 ° C. or higher, colorless] was concealed using a reversible thermochromic screen ink containing a microcapsule pigment containing therein, thereby forming a reversible thermochromic layer 4 having a floral pattern. The base paper provided with the coloring layer and the reversible thermochromic layer was cut into a plurality of puzzle pieces 2 to obtain a reversible thermochromic puzzle 1. Each of the puzzles was cut into the same jigsaw puzzle.

When the puzzle piece was cooled to 15 ° C. or lower and returned to a normal temperature range, a purple flower pattern was visually observed, and the puzzle piece was kept in a temperature range of less than 35 ° C. After fitting the puzzle pieces to complete the puzzle, a transparent container filled with warm water of 40 ° C. as a discoloration tool is brought into contact with the puzzle surface, and the reversible thermochromic layer is decolorized and bright yellow, red, and green A flower bud pattern appears. The flower bud design is kept in a temperature range exceeding 15 ° C, and when cooled to a temperature of 15 ° C or less again, the flower design appears. In addition, this aspect change could be repeatedly performed.

Example 4 A flower pattern was printed on a 40 cm × 50 cm white base paper (2 mm thick) using a pink ink, an orange ink, and a yellow-green ink to form a colored layer. In the flower pattern portion, the brightness value of the portion printed with pink ink is 6.5, the brightness value of the portion printed with orange ink is 6.3, and the brightness value of the portion printed with yellow-green ink. Was 6.2.

A reversible thermochromic pigment containing a microcapsule pigment containing a reversible thermochromic composition showing blue (lightness value 4.0) at less than 35 ° C. and colorless at 35 ° C. or more at the petal portion of the flower pattern. A screen ink was printed and concealed to form a reversible thermochromic layer in the shape of a petal. The base paper provided with the coloring layer and the reversible thermochromic layer was cut into a plurality of puzzle pieces to obtain a reversible thermochromic puzzle 1.

In the puzzle piece, a flower pattern having blue petals can be visually recognized in a normal temperature range. After fitting the puzzle pieces to complete the puzzle, a transparent container filled with warm water at 40 ° C. as a discoloration tool is brought into contact with the petal portion,
The reversible thermochromic layer is decolorized and bright yellow and orange petals appear. When the temperature of the yellow and orange petals becomes lower than 35 ° C., the reversible thermochromic layer develops color and turns blue, and becomes 35 ° again.
Appears when heated above ℃. In addition, this aspect change could be repeatedly performed.

Comparative Example 1 A pheasant design and a flower design were provided on a 30 cm × 40 cm gray base paper (thickness: 3 mm) having a lightness value of 3.5 in the same manner as in Example 1. When the puzzle is fitted to complete the puzzle, a flower image is drawn on the periphery in the normal temperature range, and a blank pattern is visually recognized in the center. When a transparent container filled with cold water of 5 ° C. as a discoloring tool is brought into contact with the puzzle surface, the central portion of the puzzle has a blackish color in which the reversible thermochromic layer is a mixture of blue, green, red and the lower gray color. The pheasant's pattern appeared, and it was not possible to obtain a clear pattern.

Comparative Example 2 A reversible thermochromic puzzle was obtained in the same manner as in Example 2, except that the pattern of the window with the colored layer was colored with brown ink. The lightness value of the design part of the window colored with the brown ink was 3.1.

When the puzzle pieces are fitted together to complete the puzzle, the house and the background, which are not displayed at all in the design of the window, can be visually recognized in the normal temperature range. When a transparent container filled with ice as a discoloration tool is brought into contact with the design part of the puzzle window, the color of the reversible thermo-discoloration temperature layer becomes reddish green and the lower layer brown is a blackish flower. The pattern appeared, and a clear pattern could not be obtained.

Comparative Example 3 A reversible thermochromic puzzle was obtained in the same manner as in Example 4 except that a flower pattern was printed using the blue ink, the brown ink, and the dark green ink, respectively. The design part of the flower is
The lightness value of the part printed with the blue ink was 3.1, the lightness value of the part printed with the brown ink was 2.9, and the lightness value of the part printed with the deep green ink was 3.0. .

In the puzzle piece, a flower pattern having a blackish petal in which a blue and brown coloring layer and a blue reversible thermochromic layer are mixed in a normal temperature range is visually recognized. After completing the puzzle, when a transparent container filled with warm water at 40 ° C. is brought into contact with the petals as a discoloration tool, the reversible thermochromic layer is discolored and petals of different colors are seen, but the color tone is changed. Because of the blue and brown petals, the color change was poor.

[0037]

According to the reversible thermochromic puzzle of the present invention, the reversible thermochromic layer has excellent contrast in the color tone between an image viewed in a color-developed state and an image viewed in the decolorized state of the reversible thermochromic layer. It is possible to provide a reversible thermochromic puzzle which is rich in the unexpectedness of obtaining an image of a bright color tone and the taste of discoloration.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a reversible thermochromic layer according to an embodiment of the present invention in a decolored state.

FIG. 2 is a perspective view showing a state in which a reversible thermochromic layer of one embodiment of the present invention has a colored state.

FIG. 3 AA of one embodiment of the reversible thermochromic puzzle of the present invention.
It is sectional drawing.

FIG. 4 is a perspective view showing a state in which a reversible thermochromic layer according to another embodiment of the present invention is colored.

FIG. 5 is a perspective view showing a reversible thermochromic layer according to another embodiment of the present invention in a decolored state.

FIG. 6 shows A- of the embodiment in addition to the reversible thermochromic puzzle of the present invention.
It is A sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reversible thermochromic puzzle 2 Puzzle piece 3 Reversible thermochromic layer 4 Coloring layer

Claims (6)

[Claims] 1. A reversible thermochromic puzzle in which a puzzle piece is provided with a reversible thermochromic layer that reversibly changes color by a temperature change directly or via a coloring layer, wherein the puzzle piece or the coloring layer is provided. A reversible thermochromic puzzle, wherein the lightness value of the piece is between 4 and 10. 2. The reversible thermochromic layer forms an image,
The reversible thermochromic puzzle according to claim 1, wherein the brightness value of the puzzle piece or the puzzle piece provided with the colored layer is 5 to 10. 3. The puzzle piece provided with the colored layer forms a colored image having a lightness value of 4 to 10, and the reversible thermochromic layer conceals the colored image having a lightness value of 1 to 5 at the time of coloring. The reversible thermochromic puzzle according to claim 1, wherein the reversible thermochromic layer is a layer, and a lightness value of the reversible thermochromic layer at the time of coloring is smaller than a lightness value of a colored image. 4. The reversible thermochromic puzzle according to claim 1, wherein said puzzle is a jigsaw puzzle. 5. A reversible thermochromic composition comprising, in a reversible thermochromic layer, three components of an organic compound medium which reversibly causes a color reaction between an electron-donating color-forming organic compound and an electron-accepting compound. The reversible thermochromic puzzle according to any one of claims 1 to 4, wherein 6. A reversible thermochromic puzzle set, comprising a heating or cooling thermochromic tool containing hot water, cold water, or ice pieces as a heating or cold heat source, and a puzzle according to claim 1.