To provide a copper-phthalocyanine composition from which a printing ink of a copper-phthalocyanine pigment is obtained, being capable of reducing a lot of time and effort for the step of converting crude copper phthalocyanine into a pigment and a step of producing the printing ink of the pigment and having a high quality and flowability.
In the copper-phthalocyanine pigment composition composed of a dry-ground product obtained by dry-grinding a crude copper phthalocyanine together with a resin for an printing ink, a ratio of the sum of integral intensities of the respective diffraction peaks obtained by X-ray diffraction, each having the maximum value at a diffraction angle satisfying 2θ=14° to 19° to that of the respective diffraction peaks obtained by X-ray diffraction, each having the maximum value at a diffraction angle satisfying 2θ=4° to 11° is 0.30 or more. The printing ink is obtained by mixing and dispersing copper-phthalocyanine pigment composition, varnish for the printing ink, and a solvent.
KOBAYASHI NAGATOSHI
KOMADA MASAO
SUZUKI KIYOTAKA
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