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US 4,289,698 AGranted
Solvent stable copper phthalocyanine blue pigments
AssigneeBASF Wyandotte Corporation
InventorJames D. Stepp
Life of this patent
Estimating the term…
Abstract
A process for producing stable copper phthalocyanine blue pigment in the alpha form. Copper phthalocyanine blue crystals are ground to produce a powder. The powder is contacted with chlorine and mixed with sulfuric acid. The pigment-sulfuric acid mixture is then mixed with water.
Claims7
A process for producing stable copper phthalocyanine blue pigment in the alpha form comprising grinding copper phthalocyanine blue crystals to produce a powder, contacting the powder with chlorine and mixing the chlorinated pigment with sulfuric acid.
Dependencies are inferred from the claim text.