Two new crystal modifications of a diketopyrrolopyrrole pigment

摘要

Diketopyrrolopyrrole of the formula <IMAGE> (I) in its beta -modification and in its gamma -modification. Both the beta -modification and the gamma -modification are suitable as pigments for coloring high-molecular weight organic material. In comparison to the alpha -modification, the beta -modification shows a shift in shade towards yellowish-red. The gamma -modification gives brilliant orange colorations.