| 摘要 |
A copper phthalocyanine compound of the formula: <IMAGE> (I) wherein CuPc is a copper phthalocyanine nucleus, R1 is an alkyl group, an aralkyl group or an aryl group each having 3 to 18 carbon atoms, R2 and R3 are, the same or different, each a hydrogen atom or a hydroxyethyl group, X is an alkali metal, a hydrogen atom or an ammonium group, a is 1 or 2, b is 0, 1 or 2 and c is 1, 2 or 3 provided that a, b and c satisfy following equation: 2</=a+b+c</=4, which is useful as a cyanic dyestuff for an aqueous ink composition, particularly for ink jet recording.
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