Process for the preparation of pigment preparations on the basis of C.I. pigment violet 23

Abstract

Abstract In the conventional dry grinding of C.I. Pigment Violet 23, the environment is greatly polluted by the inevitably produced dusts, the generation of noise and heavy vibrations during the grinding process. According to the invention, it has now been found that this deficiency can be avoided if the base pigment is finely dispersed by aqueous-alcoholic bead grinding in the presence of selected pigment dispersing agents, derived from dioxazine compounds containing basic groups, together with a subsequent solvent finish. As a result of such a combination of the two aforementioned treatment processes, an increase in capacity is possible even without otherwise expensive investments for mechanical measures. The pigment preparations produced in this manner simultaneously result in an improvement of the application properties of the colorant in the coating and especially in nitrocellulose intaglio printing, in particular an improvement of the gloss and decrease in the abrasiveness compared with the trade names known in this field.

Inventors

• 👤 Erwin Dr. Dietz
• 👤 Manfred Urban

Bibliographic Details