| 摘要 |
PURPOSE:To provide the subject ink containing a specific naphthalocyanine compound capable of absorbing near infrared ray, free from absorption in visible range, having transparency, exhibiting high absorption in near infrared region, enabling optical reading in high accuracy and having excellent light resistance. CONSTITUTION:The objective ink contains a naphthalocyanine compound of formula [M is Al, Ga, In, Tl, Si, Ge, Sn, V, Ti or Pb; Z is -OSiR4R5R6, =O, -OR4, -NHR4 or -SR4 (R4 to R6 are H, alkyl or aryl); R is halogen, -R1, -SR1, -OR1 (R1 is alkyl or aryl), -SO2NR2R3, -CONR2R3 or -NR2R3 (R2 and R3 are H, alkyl or aryl); k, l, m, n, o and p are 0, 1 or 2]. The ink can be used as a clear bar code, color bar code, multiple bar code, indelible ink, forgery- proofing ink, etc. |
