| 摘要 |
A process for the production of a beta type copper phthalocyanine pigment, comprising 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 a temperature of 180 to 50° C., to prepare an alpha/beta mixed crystal type copper phthalocyanine having an alpha ratio of 5 to 35%, and treating the dry-milled product with a water-miscible organic solvent, wherein 0.1 to 20% by weight of at least one compound selected from the group consisting of a compound of the formula (1), a compound of the formula (2) and a compound of the formula (3) is added to the dry-milled product before, during or after the step (B) <?in-line-formulae description="In-line Formulae" end="lead"?>MePc-{X-(CH<SUB>2</SUB>)<SUB>k</SUB>NR<SUB>1</SUB>R<SUB>2</SUB>}<SUB>n</SUB> (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>MePc-(SO<SUB>3</SUB><SUP>-</SUP>N<SUP>+</SUP>R<SUB>5</SUB>R<SUB>6</SUB>R<SUB>7</SUB>R<SUB>8</SUB>)<SUB>p</SUB>. (3)<?in-line-formulae description="In-line Formulae" end="tail"?>
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