Ciba-geigy Corporation

Robert B Todd

George H Robertson

Robert L Rooney

Combined spade and fork

Garden hand tool

A process for producing a pigment or dyestuff composition in the form of dustless readily-dispersible granules which comprises contacting, with agitation, an aqueous dispersion of a pigment, and an aniline which is liquid at temperature below 100.degree. C., insoluble in water at pH values above 7, and soluble in water at pH values below 7, the pH value being first above 7, maintaining the temperature above the melting point of the aniline and reducing the pH to below 7 to render the aniline compound soluble in water, and recovering the resulting granules in a solvent free condition.

Process for making dustless, readily-dispensible pigment granules

A process for producing a pigment or dyestuff composition in the form of dustless readily-dispersible granules which comprises contacting, with agitation, an aqueous dispersion of a pigment, a protective colloid, an aliphatic or araliphatic amine which is liquid at temperatures below 100.degree. C., insoluble in water at pH values above 7, and soluble in water at pH values below 7, and an organic carrier, the pH value being first above 7, maintaining the temperature above the melting point of the amine compound, and reducing the pH to below 7 to render the amine compound soluble in water, and recovering the resulting granules.

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Paisley, United Kingdom

Robert B Todd