| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an erasable ink composition in which written lines can not be erased by a commercial eraser, but can be erased by using a specific erasing tool. <P>SOLUTION: The ink composition comprises at least a pigment, a thickener, a film-forming resin and water and lines written by the ink composition can not be erased by an eraser in which erasing ability (erasing ratio) based on JIS S 6050-2002 is expressed by≥50°and <70°hardness (erasing ratio is <70%) and can be erased by an erasing tool in which erasing ability (erasing ratio) is expressed by≥70°and <100°hardness (erasing ratio is≥70%). <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
