Sulfuric Acid → Alpha.-Copper phthalocyanine

Participants

Reaction Steps

100 Part of crude copper phthalocyanine was treated in 500 parts of a 98% sulfuric acid aqueous solution at room temperature for 2 hours, and filtered. The resultant solid was washed with water and dried to give an α-form crude copper phthalocyanine. Thereafter, the α-form crude copper phthalocyanine was treated in the same way as in Example 1 to give a β-copper phthalocyanine pigment.

Provenance & Evidence