Process for producing .beta.-form copper phthalocyanine pigment

Details Process for producing .beta.-form copper phthalocyanine pigment Process for producing .beta.-form copper phthalocyanine pigment

1997-04-25

1998-06-30

Green, Anthony

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106410, 106411, 106412, 540141, C09B 4704

Patent

active

057727503

ABSTRACT:
The present invention is a method for preparing a .beta.-form copper phthalocyanine pigment comprising the steps of; dry milling crude copper phthalocyanine at a temperature between 110.degree. and 200.degree. C., and transforming an .alpha.-form crystal to a .beta.-form crystal by treating the resulting .alpha.-.beta. mixture of copper phthalocyanine in an organic solvent or a liquid mixture of water and an organic solvent. The preparation method of the present invention offers a .beta.-form copper phthalocyanine pigment at lower cost having equivalent or superior quality in color strength, clearness, fluidity and hue compared to the pigment produced by the conventional salt milling method.

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