| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a water-erasable marking pen ink composition which can give densely colored writing, can keep its good water-erasability even after a long time and does not fade even after a long time by using a specified component. SOLUTION: This composition contains an electron-donating color organic compound, an electron-accepting color developer selected from gallic acid and bisphenol S, a compound selected from among polyoxyalkylene monoallyl monomethyl ether/maleic anhydride/styrene copolymers, polyethylene alkyl ether carboxylic acids, polyethylene aryl ether phosphoric esters, and polyethylene alkyl ether phosphoric esters and a mixed solvent containing an organic solvent selected from among isopropanol, propylene glycol monomethyl ether, 3-methoxy-3-methylbutanol, methyl lactate and ethyl lactate and ethanol.</p> |
