| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a marking ink for a writing board, which can be used for writing on a writing board and the hand writing by which can be erased with ease, characterized in that the handwriting just after the writing and that after the elapse of a long time from the writing can be both erased with ease. <P>SOLUTION: Provided is a marking ink composition for a writing board which comprises a pigment and polyvinylbutyral and further comprises, as an erasing additive, an aliphatic dibasic acid ester adsorbed to an anhydrous silica such as hydrophilic silica, hydrophobic silica and a mixed oxide silica. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
