AQUEOUS MARKING PEN INK COMPOSITION FOR WRITING BOARD

PURPOSE:To obtain the subject ink composition consisting essentially of a pigment, a resin and a specific phosphoric acid ester compound in a solvent consisting essentially of water and further containing a release agent, and capable of simply erasing handwriting on a writing board called a white board with an erasing tool. CONSTITUTION:A pigment (e.g. carbon black) as a coloring agent, a resin (e.g. polyvinyl alcohol) and a release agent consisting of a phosphoric acid ester compound of the formula (R1 to R3 are acyl or alkyl) is blended in a solvent consisting essentially of water, and further, the bland is blended with a wetting agent (e.g. glyceral), an activating agent (e.g. fluorine-based surfactant) and an antiseptic agent to provide the objective aqueous marking pen ink composition capable of simply erasing with an erasing tool such as dry cloth or soft paper when handwriting on a writing board called white board and excellent is erasing property before drying of those handwritten.