Reversible thermochromic composition, reversible thermochromic microcapsule pigment comprising same, and writing instrument using same

A thermochromic and composition technology, which is used in writing utensils, color-changing fluorescent materials, medical preparations containing active ingredients, etc., can solve the problems of undisclosed fluorane derivatives, etc., and achieve the effect of excellent contrast

Pending Publication Date: 2021-11-12
THE PILOT INK CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned Patent Documents 1 to 3, a large number of fluorane derivatives are listed as electron-donating color-developing organic compounds or leuco pigments capable of displaying black to green, but they do not disclose specific structures in the present invention. Fluorane derivatives

Method used

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  • Reversible thermochromic composition, reversible thermochromic microcapsule pigment comprising same, and writing instrument using same
  • Reversible thermochromic composition, reversible thermochromic microcapsule pigment comprising same, and writing instrument using same
  • Reversible thermochromic composition, reversible thermochromic microcapsule pigment comprising same, and writing instrument using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[1504] Preparation of reversible thermochromic composition

[1505] 1 part of 2-(4-chloroanilino)-3-methyl-6-(N-ethyl-N-p-tolylamino)fluorane as component (a), 1 part as component (b), 5 parts of 1-bis(4-hydroxyphenyl) n-decane, 25 parts of myristyl alcohol as component (c), and 25 parts of butyl stearate were mixed, heated and melted to obtain a color change from black to Colorless reversible thermochromic composition.

Embodiment 2

[1507] Preparation of Reversible Thermochromic Microcapsule Pigment

[1508] After putting the reversible thermochromic composition of Example 1 into a mixed solution consisting of 35 parts of an aromatic isocyanate prepolymer and 40 parts of a cosolvent as a wall film material, it was emulsified and dispersed in an 8% polyvinyl alcohol aqueous solution After stirring continuously while heating, 2.5 parts of water-soluble aliphatic modified amines were added, and further stirring was continued to prepare a microcapsule dispersion. A reversible thermochromic microcapsule pigment having an average particle diameter of 2.0 μm was obtained from the above microcapsule dispersion by a centrifugation method.

[1509] The compositions of the reversible thermochromic compositions of Examples 1 to 29, the presence or absence of microencapsulation, and the color changes of the reversible thermochromic compositions are shown in Tables 1 to 3 below. In addition, the reversible thermochrom...

Embodiment 30

[1575] Preparation of Water-Based Ink for Writing Instruments

[1576] 25 parts of reversible thermochromic microcapsule pigment A (pre-cooled to below -18°C to black color), 0.3 parts of shear viscosity-reducing agent (xanthan gum), 10 parts of urea, 10 parts of glycerin, non 0.5 parts of ion-based permeability-imparting agent [manufactured by Sannopko Co., Ltd., product name: Nopco SW-WET-366], 0.1 part of modified silicone-based antifoaming agent [manufactured by Sannopko Co., Ltd., product name: Nopco 8034], Phosphate-based surfactant [Daiichi Kogyo Pharmaceutical Co., Ltd., product name: Premium Surf AL] 0.5 parts, pH regulator (triethanolamine) 0.5 parts, antifungal agent [Ronza Japan Co., Ltd. product name : Prokisel XL-2] 0.2 parts and 52.9 parts of water were mixed to prepare an aqueous ink for writing instruments.

[1577] The production of ballpoint pen

[1578] After the above-mentioned aqueous ink was suction-filled into an ink storage tube made of a polypropyle...

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Abstract

[Problem] To provide a reversible thermochromic composition, and a microcapsule pigment comprising the same, the reversible thermochromic composition: exhibiting a black color at the time of color development and color changing to colorless when decolorized; having excellent contrast between a color-developed state and a decolorized state; and having a high commercial value, by using a fluoran derivative having a specific structure as an electron-donating coloring organic compound. [Solution] Provided is a reversible thermochromic composition comprising: (a) a fluoran derivative being an electron-donating and coloring organic compound and having a specific structure; (b) an electron accepting compound; and (c) a reaction medium that reversibly causes an electron transfer reaction by means of component (a) and component (b) in a specific temperature range. Also provided is a reversible thermochromic microcapsule pigment comprising the reversible thermochromic composition.

Description

technical field [0001] The present invention relates to a reversible thermochromic composition and a reversible thermochromic microcapsule pigment containing the reversible thermochromic composition. In more detail, it relates to a reversible thermochromic composition that exhibits black when developing color and changes color to colorless when decolorizing, and a reversible thermochromic microcapsule pigment including the reversible thermochromic composition. Background technique [0002] Conventionally, an electron-donating chromogenic organic compound, an electron-accepting compound, and a reaction medium in which an electron-donating reaction between an electron-donating chromogenic organic compound and an electron-accepting compound reversibly occurs in a specific temperature range have been disclosed as A reversible thermochromic composition whose color changes from black to green to colorless as an essential component (for example, refer to Patent Documents 1 and 2). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61Q1/02C08K9/10C08L101/00C09D11/037A61K8/49C09B11/28C09B67/20
CPCA61Q1/02C08K9/10C09D11/17C09D11/18C09D11/50C08K5/1545C08K5/0041A61K8/498A61K2800/438A61K8/347A61K8/70A61K8/37C09B11/28C09D11/037C08L101/00A61K8/49B43K7/00B43K8/02B43K8/022B43K19/00C09B11/24C09B67/0097C09K9/02C09K2211/1007C09K2211/1014C09K2211/1022
Inventor 梅本宽森垣结衣桝重直登
Owner THE PILOT INK CO LTD
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