| 摘要 |
<p>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 the 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 block copolymer which is liquid at room temperature and 2-10wt.% at least one compound which is liquid at room temperature and selected from the group consisting of carboxylic esters, polyoxypropylene monoalkyl ethers and polyoxyethylene/ polyoxypropylene monoalkyl ethers.</p> |
