| 摘要 |
<p>PURPOSE:To obtain the title ink having improved erasability a long time after writing on a writing board such as a white board, by mixing a coloring agent, a resin, a solvent, and a specified compound. CONSTITUTION:The title ink is obtained by mixing 1-15% coloring agent comprising a pigment, 1-20% resin such as a vinyl or cellulosic resin, 40-90% volatile solvent such as an alcoholic, ketonic or ester solvent, 0.05-10% carboxylated polyoxyethylene alkyl ether (derivative) of the formula (wherein R is 4-18C alkyl; n is 1-20; and M is H, an atom. of metal such as Na or K, ammonium or alkanolamine), and 0-20% other additives.</p> |
