| 摘要 |
An easily dispersible deeply colored pigmentary form of copper phthalocyanine (CuPc) is obtained from crude CuPc, when the crude CuPc is milled in the absence of assistants but in the presence of from 0.5 to 15% by weight of one or more acids which have a pK of <4.9 and are non-oxidizing under the milling conditions, until a milled material is obtained in which the primary particles haves size of up to 0.1 mu m, and the milled material is then converted to the pigmentary form by heating in water in the presence of from 3 to 30% by weight of a surfactant. On isolating the product, a CuPc pigment is obtained which gives very deep colorations and is very easily dispersible in surface coatings, printing inks and plastics. |
