METHOD OF PREPARING METAL PHTHALOCYANINES Russian patent published in 2000 - IPC

Abstract RU 2148582 C1

FIELD: organic synthesis. SUBSTANCE: invention aims at developing universal high-productivity and environmentally safe method for preparing high-quality metal phthalocyanines. To that aim, phthalic anhydride interacts with urea and salt of corresponding metal in presence of catalyst in high-boiling solvent, more particularly mixture of aliphatic linear C₁₂-C₁₆-hydrocarbons with boiling point 250-290 C. Utilization of above-mentioned solvent results in the following: products form mobile suspensions in this solvent, which enables their separation by common filtration and centrifugation; side reactions of chlorination of benzene nuclei of phthalocyanine leading to strong worsening of dyeing properties of phthalocyanine dyes and pigments are ruled out; productivity on conventional equipment increases by 4-5 times; solvent contains no aromatics and is characterized by lowest toxicity. EFFECT: enhanced process efficiency. 1 tbl, 10 ex

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Authors

Dates

2000-05-10—Published

1999-04-15—Filed