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US 2018/0127585 A1Published application
Phthalocyanine synthesis
AssigneeSun Chemical Corporation
InventorsNorman W. Smith, Paul A. Merchak
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Abstract
Provided are methods for preparing a phthalocyanine pigment in high yield that eliminate the need to add a heavy metal catalyst. The resulting pigmentary phthalocyanine products thus contain no or only trace amounts of heavy metal impurities. The provided methods produce phthalocyanine pigments that can be used in any application that utilizes phthalocyanine pigments, such as in dispersions, printing inks, paints, plastics and coatings.
Claims20
A method for preparing aluminum phthalocyanine, comprising:
- providing a reaction mixture containing a phthalonitrile;
- aluminum (III) chloride, an ammonium salt of the formula (NH4)nX, and solvent, and
- heating the reaction mixture to an elevated temperature greater than room temperature to produce aluminum phthalocyanine;
- wherein:
- X is selected from a halide ion, a sulfur-containing ion, a nitrogen-containing ion, a carboxylic acid-containing ion, and a phosphorous-containing ion;
- n is 1 or 2;
- the reaction mixture does not include an added heavy metal catalyst;
- and
- the solvent comprises one or more halogenated aromatic solvents and is free of water.
6 more elements
Dependencies are inferred from the claim text.