| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an ink composition for reversible thermochromic stamp, capable of forming a clear seal image having excellent thermally color- changeable function and resistance to scratch. SOLUTION: This ink composition for a reversible thermochromic stamp comprises a reversible thermochromic microcapsule pigment composed of a reversible thermochromic composition comprising (a) an electron-donating coloring organic compound, (b) an electron-accepting compound and (c) a reaction medium for determining the temperature of initiating a color reaction between both the compounds, having 0.1-15μm average particle diameter [(major axis + minor axis)/2] and the ratio of the reversible thermochromic composition/wall membrane of 7/1-1/1 (weight ratio), a water-soluble organic solvent and water and exhibits 1,000-10,000 mPa.s ink viscosity.</p> |
