| 摘要 |
<p>PURPOSE:To obtain an information carrying sheet in which an information pattern is scarcely visually observed by bare eyes by arranging an information pattern formed of infrared absorption ink containing infrared absorption substance represented by the specific structural formula on an upper surface of a substrate having infrared reflectivity. CONSTITUTION:A specific information pattern is arranged on an upper surface of a substrate having infrared reflectivity to form an information carrying sheet. The pattern is formed of infrared absorption ink containing infrared absorption substance represented by the shown structure. In the formula, n is natural number of 1 or 2, R is hydrogen atom or alkyl group having 1-12 carbon atoms, X<-> is ClO4<->, BF4<->, CCl3COO<->, CF3COO<->, SbF6<->, C6H5SO3<->, C2H5SO3<->, or PO4<3->, or their mixture. The ink may contain colored pigment or dye together with the absorption substance. Thus, the sheet in which the pattern is scarcely visually observed with bare eyes is obtained.</p> |
