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
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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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