Process for preparing pigment granules from aqueous suspension of pigment and alkaline solution of resin
AssigneeHoechst Aktiengesellschaft
InventorsReinhold Deubel, Christa Uhde nee Schilling, Werner Marx
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Abstract
Easily dispersible dust-free pigment granules of high tinctorial strength are obtained by adding to the aqueous suspension of a finely divided pigment, an alkaline solution of from 25 to 90 weight percent based on the weight of the granules obtained, of colophony or a colophony derivative, acidifying the mixture, subjecting it to a flush process while stirring and heating to a temperature, above the softening point of the resin, up to 100.degree. C. and isolatng the granules obtained. The granules are particularly suitable for preparing printing inks which are distinguished by a very high tinctorial strength, a good transparency and a low viscosity.
Claims7
A process for preparing pigment granules, which comprises adding to the aqueous suspension of a finely divided pigment an alkaline solution of from 25 to 90 weight %, based on the weight of the granules obtained, of colophony or a colophony derivative, acidifying the mixture, subjecting it to a flush process while stirring and heating to a temperature, above the softening point of the resin, up to 100.degree. C. and isolating the granules obtained.
Dependencies are inferred from the claim text.