Preparation of phthalocyanine pigments

Details Preparation of phthalocyanine pigments Preparation of phthalocyanine pigments

C - Chemistry, Metallurgy

09

B

C09B 47/06 (2006.01)

Patent

CA 2144816

This invention relates to an improved process for preparing metal phthalocyanine pigments comprising (a) heating at a temperature of about 150°C to about 200°C a mixture comprising (i) a phthalocyanine-forming material based on phthalic acid, (ii) at least about 25 mole percent, relative to the phthalo- cyanine-forming material (i), of a metal donor, (iii) at least about 100 mole percent, relative to the phthalo- cyanine-forming material (i), of a nitrogen donor, (iv) 1 to about 20 percent by weight, relative to the phthalo- cyanine-forming material (i), of a catalyst, and (v) about 250 to about 400 percent by weight, relative to the phthalocyanine-forming material (i), of a di(C1-C3 alkyl) phthalate solvent; and (b) isolating the metal phthalocyanine pigment.

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