| abstract |
A solid solution of 1,4-diketopyrrolo-[3,4-c]-pyrrols consisting of two different compounds of the formulae <IMAGE> the formulae <IMAGE> or the formulae <IMAGE> wherein A is one of the groups <IMAGE> <IMAGE> and B, E and D are each independently a group <IMAGE> where R1 and R2 are each independently hydrogen, halogen, C1-C5-alkyl, C1-C5-alkoxy, -SR3, -N(R3)2,-CF3,-CN, a group <IMAGE> +TR <IMAGE> R3 is C1-C5-alkyl and R4 and R5 are each independently hydrogen, halogen, C1-C5-alkyl, C1-C5-alkoxy,-SR3 or-CN having X-ray diffraction patterns which differ from the sum of the X-ray diffraction patterns of the individual components. Such solid solutions are excellently suited as pigments for the coloration of high molecular organic material. |