| 摘要 |
PURPOSE:To provide an erasable ink composition for writing board whose erasability does not dependent on the material of the board and which is excellent in erasability both in the beginning of application and after lapse of time. CONSTITUTION:The objective ink composition comprises an organic solvent, a resin and a pigment as the main components, which further comprises, as the release agent, 5-20wt.% polyoxyethylene/polyoxypropylene monoalkyl ether which is liquid at room temperature and preferably 2-10wt.% at least one compound which is liquid at room temperature and selected from the group consisting of carboxylic esters and polyoxypropylene monoalkyl ethers. |
