| 摘要 |
PROBLEM TO BE SOLVED: To improve the light-resistance and the preservation stability, and at the same time, make adaptable to a high density disk system of the next generation by containing at least one kind of azo metal chelate compounds comprising an azo compound represented by a specified structural formula, and a metal or its salt, in a recording layer. SOLUTION: At least one kind of a metal chelate compound comprising an azo compound represented by a specified formula (in the formula, R1 and R2 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group or aryl group, and R1 and R2 may form a cycle by linking. R3-R11 each independently represent a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxy group, a carboxy group, an amino group, or a calbamoyl group, and R3 and R4, R4 and R1 or R2, R5 and R1 or R2, R6 and R7, R7 and R8, R8 and R9, R9 and R10, and R10 and R11 may form a cycle by linking. X represents a hydroxy group, an alkyloxy group, an aryloxy group, or a carboxy group.) a metal or its salt, is contained in a recording layer. |
