Process of producing a phthalocyanine pigment
First Claim
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1. A process of producing a β
- -phthalocyanine pigment comprising(a) dry grinding a crude phthalocyanine to obtain an α
-/β
-phthalocyanine,(b) stirring the product of stage (a) with an aqueous medium, in the absence of an organic solvent, and wherein said aqueous medium contains a surfactant exhibiting a net non-ionic character or said surfactant complexed with an ionic surfactant, to convert said α
-/β
-phthalocyanine to the β
-phthalocyanine form and(c) isolating the resulting β
-phthalocyanine pigmentary product.
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Abstract
A process of producing a phthalocyanine pigment comprising dry grinding a crude phthalocyanine, stirring the ground product with an aqueous medium containing a surfactant and isolating the pigmentary product which, when dispersed into surface coating media, provide colorations having high brillance and depth of shade.
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14 Claims
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1. A process of producing a β
- -phthalocyanine pigment comprising
(a) dry grinding a crude phthalocyanine to obtain an α
-/β
-phthalocyanine,(b) stirring the product of stage (a) with an aqueous medium, in the absence of an organic solvent, and wherein said aqueous medium contains a surfactant exhibiting a net non-ionic character or said surfactant complexed with an ionic surfactant, to convert said α
-/β
-phthalocyanine to the β
-phthalocyanine form and(c) isolating the resulting β
-phthalocyanine pigmentary product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- -phthalocyanine pigment comprising
Specification