| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a scratch type aqueous ink composition that can hide a letter etc., stamped, written or painted on a so called absorptive surface such as paper, clothes, etc., and the letter etc., hidden by the painted film can be read by scratching off the film using a coin, etc. <P>SOLUTION: The aqueous ink comprises an aluminium pigment, that is comprised of a scaly particle whose particle diameter is at least 20μm in a median size, and an acrylic resin whose number average molecular weight is 500-5,000, and the amount of the aluminium pigment to the total ink is 1-60 wt% and the amount of the acrylic resin to the total ink is 5-40 wt%. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
