Abstract
Wyler's wet method for synthesis of copper phthalocyanine was applied for synthesis of copper-Bz-aza (3, 4) phthalocyanine from cinchomeronic acid and phthalic anhydride, The ratios of raw materials were changed and the properties of products were investigated. This product in concentrated sulfuric acid was diluted with water and the pigments precipitated in various concentration of sulfuric acid were separated by filtration. The relation between ratios of raw materials, and the amount of separated pigments and its properties was investigated. A comparative test on a mixture of copper phthalocyanine and copper tetra (3, 4)-pyridinoporphyrazine indicated that the higher the numbers of pyridine ring in a phthalocyanine molecule the lower was the concentration of sulfuric acid required for precipitation.
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