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Thermochromic composition and thermochromic microcapsules

A composition and thermochromic technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems of the temperature difference between color development temperature and achromatic temperature, and achieve large color-changing color difference, clear color-changing behavior, and high color-changing color difference. Effect

Inactive Publication Date: 2011-02-09
SAKURA COLOR PRODUCTS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In general, in the heating-cooling cycle, the thermochromic composition can reversibly repeat color development-color loss or color loss-color development, but usually there is a temperature difference between the color development temperature and the color loss temperature (i.e. Temperature lag ΔH)

Method used

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  • Thermochromic composition and thermochromic microcapsules
  • Thermochromic composition and thermochromic microcapsules
  • Thermochromic composition and thermochromic microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～14 and comparative example 1～4

[0134] While heating each component shown in Table 1 at 120-180 degreeC, it mixed uniformly with the stirrer, and prepared each thermochromic composition.

[0135]

Embodiment 15～25 and comparative example 5～7

[0137] Using the materials shown in Table 2, the thermochromic compositions obtained in Examples 2-4 and 7-14 and Comparative Examples 5-7 were microencapsulated. Table 3 shows the corresponding relationship of the thermochromic composition.

[0138] First, the main resin agent (main raw material) and the thermochromic composition as the capsule wall film are uniformly mixed and dissolved using a dissolution aid (solvent) to obtain a solution. Next, the above-mentioned solution was added to the emulsifier aqueous solution heated at 30 to 60° C., while performing medium-shear stirring. Next, by performing high-shear stirring, an O / W emulsion (particle diameter of droplets: about 5 μm) was obtained from the above solution. Then, switch to low-shear stirring, and add a crosslinking agent aqueous solution dropwise to the above-mentioned O / W emulsion. After reacting at a temperature of 60-90° C. for 3-12 hours, cool to room temperature to obtain a slurry in which microcapsules ar...

Embodiment 26～4l

[0145] In the microcapsules of Example 18 (ie, the thermochromic composition of Example 7), the color formers were changed as shown in Table 4.

[0146]

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Abstract

The invention provides a thermochromic composition which little suffers from residual color in the faded state and exhibits relatively large color difference on color change; and a process for production of the same. The invention relates to a thermochromic composition comprising an electron-donating color-developing organic compound, an electron-accepting compound and a desensitizer which is characterized in that the desensitizer is (1) a fatty acid methyl ester having 5 or more carbon atoms in total and / or (2) a fatty acid amide having 4 or more carbon atoms in total. A thermochromic composition having a desired color-temperature hysteresis can be produced by changing the blending ratio between the desensitizers (1) and (2) in incorporating both with the other components.

Description

technical field [0001] The present invention relates to a thermochromic composition and thermochromic microcapsules. The invention also relates to methods of making thermochromic compositions. Background technique [0002] The thermochromic composition undergoes reversible color development and color loss due to temperature, and can be used, for example, in printed matters, inks, paints, packaging materials, recording materials, and the like. As a representative example of such a composition, there is a composition utilizing an electron transfer reaction between an electron-donating chromogenic organic compound (electron donor) and an electron-accepting compound (electron acceptor) (Patent Document 1, Patent Document 2, etc.) . [0003] In general, in the heating-cooling cycle, the thermochromic composition can reversibly repeat color development-color loss or color loss-color development, but usually there is a temperature difference between the color development temperat...

Claims

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Application Information

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IPC IPC(8): C09K9/02
Inventor 大城盛作
Owner SAKURA COLOR PRODUCTS CORPORATION
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