| 摘要 |
PURPOSE:To obtain copper phthalocyanine pigment having a high color density, by mixing dried, ground crude copper phthalocyanine with an aq. soln. of butyl cellosolve at room temp. and heating the mixture at a specified temp. CONSTITUTION:Crude copper phthalocyanine is dried and ground. The resulting ground material is blended with an aq. soln. of 9-58% butyl cellosolve in a ratio of the ground material to butyl cellosolve of 1:1-0.05. The mixture is homogeneously mixed at room temp. and then heated at 50-100 deg.C to obtain the desired pigment. Examples of grinding aids for use in grinding crude copper phthalocyanine are water-soluble materials such as sodium chloride, sodium sulfate and calcium chloride. Butyl cellosolve is soluble in water at room temp. and well dissolved in water. However, when it is heated to 50 deg.C or above, it becomes water-insoluble. Thus, when butyl cellosolve is mixed with water and the pigment is treated at 50 deg.C or above, butyl cellosolve is separated from water, completely absorbed by the surface of the pigment and effectively promotes the crystal transition and the crystallization of the pigment.
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