| 摘要 |
A process for the production of a beta type copper phthalocyanine pigment having an average primary crystal diameter of 80±40 nm and a primary crystal aspect ratio of 2.0±1.0 and having a crystallite diameter of 22±5 nm in the direction perpendicular to a monoclinic beta (200) plane, a crystallite diameter of 27±5 nm in the direction perpendicular to a beta (001) plane and a crystallite diameter of 15±5 nm in the direction perpendicular to a beta (010) plane,which process comprises,dry-milling a crude copper phthalocyanine having a purity of 97 to 100% and a primary crystal diameter of 0.5 to 100 mum at 180 to 50° C., to prepare an alpha/beta mixed crystal type copper phthalocyanine having an a ratio of 5 to 35%, andtreating the dry-milled product in a water-miscible organic solvent.
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