JP3312263B2 - Thermochromic fluid for toys - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thermochromic fluid for toys. More specifically, the present invention relates to a thermochromic fluid for a toy which has fluidity, has low adhesion even when directly kneaded with bare hands, and changes color when heated or cooled.

[0002]

2. Description of the Related Art Conventionally, aqueous gel compositions having fluidity, self-adhesiveness and non-stickiness have been disclosed in JP-A-61-263632, JP-A-60-152536, and the like.
Applied to toys. Since the fluid for toys has a unique feel, an indefinite, extensible, and self-adhering property even when divided, it can be returned to a single body again and has unexpectedness.

[0003]

As described above, when the gel composition is used as a toy, there is an advantage that it can be repeatedly played without worrying about breakage and the like, in addition to the goodness of various plastic deformations. However, when used for a long time, the game tended to be monotonous and often bored.

An object of the present invention is to provide a toy fluid which is more surprising and changeable during play, and which does not get tired of playing for a long time.

[0005]

According to the present invention, there is provided a toy fluid comprising a gel composition, in which three components of an electron-donating color-forming organic compound, an electron-accepting compound, and a color-changing temperature regulator are included. A thermochromic fluid for toys, characterized in that the microcapsule pigment is dispersed in the gel composition at a ratio of 0.5 to 20% by weight on a dry weight basis of the total weight.

The thermochromic material constituting the reversible thermochromic composition includes, for example, an electron-donating color-forming organic compound, a developer for the compound, and a compound serving as a medium for causing a color reaction between the two. The thermochromic material containing the three components or the thermochromic material exhibiting the color changing property in the form of fine particles of a resin solid solution of the above components (for example, JP-B-51-35414, JP-B-51-44706, and JP-B-52) -7764, Japanese Patent Publication No. 1-29898, etc.). 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
The state is maintained while the heat or cold required to develop the state is applied, but returns to the state exhibited in the normal temperature range if the application of the heat or cold is stopped, so-called temperature-color density due to temperature change. This type shows a small hysteresis width and changes color.

In addition, Japanese Patent Publication No. 4-1 proposed by the present applicant has been proposed.
A system described in Japanese Patent No. 7154, which is colored with a thermochromic material containing a color-memorizing thermochromic dye that exhibits a large hysteresis characteristic and changes color, is also effective. The dye changes color with a large hysteresis width (ΔH).
That is, the shape of the curve plotting the change in the coloring density due to the temperature change is different from the case where the temperature is increased from a temperature lower than the color change temperature range to the case where the temperature is decreased from the temperature higher than the color change temperature range. It is a type that changes color following a very different path. As the reversible thermochromic material, a microcapsule pigment encapsulated in a microcapsule is preferably used in order to improve the sensitivity and sharpness of the color change.

The thermochromic material can be diversified from colored (1) to colored (2) by adding and using general dyes, pigments, fluorescent pigments and the like. The thermochromic material is present in the gel composition in an amount of 0.5% on a dry weight basis.
To 20% by weight, preferably 1 to 7% by weight, and a necessary and sufficient coloring effect can be obtained within the above range.

The gel composition can be obtained by gelling various water-soluble polymers such as vinyl polymers, starch compounds, polysaccharides such as cellulose compounds, and the like. Guar gum is used as a gel composition for toys. A gel of a water-soluble polysaccharide selected from, xanthan gum and locust bean gum is preferably used. The water-soluble polysaccharide is used in an amount of 1 to 10% by weight, preferably 2 to 4% by weight based on the total weight. If it is less than 2%, the fluid has high tackiness and is difficult to adhere to the hand and remove. 4%
In the case described above, the fluidity is lost and it is difficult to elongate.

For gelling the polysaccharide, a conventionally known gelling agent is used, and usually, sodium borate,
Borates, such as borax, are applied depending on the desired degree of gelation. Furthermore, in order to impart easy peelability from the hands of the gelation itself, it is prepared by adding an alkaline PH buffer solution for adjusting the pH of the gelation itself to 7 to 10. Further, if desired, polyhydric alcohols such as polyethylene glycol and glycerin, preservatives, deodorants, fragrances, dyes, pigments and the like can be added as wetting agents.

[0011]

The reversible thermochromic fluid can be kneaded, stretched, or split by hand, or combined with the split pieces again. In the course of the above-mentioned play, the reversible thermochromic fluid changes color due to body temperature, and becomes a different color. When the game is stopped and left or cooled, the color returns to the color before use.

[0012]

【Example】

Example 1 In the examples, “parts” means “parts by weight”. The same applies to the following embodiments. 12 parts of fine powdered calcium carbonate is gradually added to 700 parts of ion-exchanged water while stirring to dissolve uniformly.

In this solution, 1.5 parts of 3-ethoxy-4-diethylaminophenyl-3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide, 3 parts of bisnol A, 15 parts of stearyl caprate Of the reversible thermochromic composition, which comprises 30 parts by weight and 15 parts of cetyl alcohol and changes color from blue to colorless at 30 ° C. or higher, is encapsulated with an epoxy resin film in 40 parts (capacity: 50 parts).
%) And dispersed until uniform.

Guar gum [Guapack PM-1, manufactured by Dainippon Pharmaceutical Co., Ltd.] is added to the aqueous solution of the reversible thermochromic microcapsules.
30 parts and 3 parts of sodium borate are added slowly with stirring and dispersed until uniform. Further, 10 parts of sodium dihydrogen phosphate and 3 parts of sodium benzoate are successively added and dispersed.

Next, 90 parts of dipotassium hydrogen phosphate and 50 parts of glycerin are added.

The fluorescent pigment Z-11 Aurora Pink [DA
YGLO 15 parts) and stirred until the pigment was uniformly dispersed to obtain a thermochromic fluid for toys. This thermochromic fluid for toys is a pink thermochromic fluid at 30 ° C or higher and a purple thermochromic fluid at 30 ° C or lower. When held by hand and played, it changes color from purple to pink at body temperature and stops playing. To return to purple again.

Example 2 Calcium sulfate (12 parts) was gradually added to 700 parts of ion-exchanged water while stirring to dissolve it uniformly.

In this solution, a reversible thermochromic composition containing a color-memorizing thermochromic dye that changes color from blue to colorless (high-temperature side color change point 30 ° C., low-temperature side color change point 15 ° C.)
Utilizing the thermochromic material described in Japanese Patent No. 17154], and adding 80 parts of a reversible thermochromic microcapsule (content: 50%) encapsulated with an epoxy resin film, and dispersing the mixture until uniform.

Guar gum [Guapac PM-1, manufactured by Dainippon Pharmaceutical Co., Ltd.] is added to the aqueous solution of the reversible thermochromic microcapsules.
30 parts and 3 parts of sodium borate are added slowly with stirring and dispersed until uniform. Further, 10 parts of sodium dihydrogen phosphate, 2 parts of disodium ethylenediaminetetraacetate, Proxel XL-2 [I
CI Co.] is added and dispersed.

Next, 90 parts of dipotassium hydrogen phosphate, 50 parts of propylene glycol and polyethylene glycol (P
(EG-400) 10 parts are added.

The fluorescent pigment Z-11 Aurora Pink [DA
YGLO 15 parts) and stirred until the pigment was uniformly dispersed to obtain a thermochromic fluid for toys. When the thermochromic fluid for toys is heated at body temperature or the like, the color of the fluid changes from purple to pink at 30 ° C. or higher, and the color tone does not change even when playing at room temperature, and is maintained in a pink state.

When the purple thermochromic fluid for toys is cooled to 15 ° C. or less with ice or a refrigerator, the color changes from pink to purple, and this color does not change even when left at room temperature. Is held in the state of. When heated to 30 ° C. or more again, the color changes from purple to pink and can be used repeatedly.

[0023]

As described above, the reversible thermochromic fluid of the present invention has a unique feel, an amorphous, extensible, and self-adhering property even after splitting. It is possible to provide a fluid for toys that does not get tired even after playing for a long time by adding the unexpectedness and variability that the color changes during or after use by applying heat or cold to the physical property such as it can.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A63H 33/00 A63H 33/22

Claims (1)

(57) [Claims] 1. A toy fluid comprising a gel composition, a microcapsule pigment containing three components of an electron-donating color-forming organic compound, an electron-accepting compound, and a color-changing temperature regulator, the total weight of which is: A thermochromic fluid for toys characterized by being dispersed in a gel composition at a ratio of 0.5 to 20% by weight in the composition.