| 摘要 |
PURPOSE:To obtain an optical information medium having excellent workability, stability and agglomeration resistance by incorporating specific colorant in an information recording layer. CONSTITUTION:An information recording layer contains germanium phthalonaphthalocyanine colorant represented by the formula (1) obtained by forming phthalonaphthalocyanine ring by mixing 1, 3-diiminoisoindoline, and 1, 3-diiminobenz(f)isoindoline at 0.01/3.99-3.99/0.01 of molar ratio. In the formula (1), (PNPc) represents phthalonaphthalocyanine ring in which germanium is of central metal, R1 and R2 are alkyl, alkenyl and acyl group having a1-32C normal chain, branch chain or cyclic structure, or aryl group having 6-20C. |
