Patent ID: 6036766
Filing Date: 2000-03-14
Classification: C09B

Abstract:
A single-phase ternary solid solution consisting of two different compounds of formulae ##STR34## wherein A and B, which must be different, are each a group of formula ##STR35## wherein R.sub.1 and R.sub.2 are each independently of the other hydrogen, methyl, tert-butyl, chloro, bromo or CNwherein the 1,4-diketopyrrolo[3,4-c]pyrrole having the smaller geometric constitution comprises 50 to 70 mole % of the mixture of the compounds of formulae (I) and (II);and 4 to 28 mole-percent relative to the sum of (I) plus (II), of a third component, which third component is a quinacridone of formula ##STR36## wherein R is hydrogen, halogen, C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkoxy, orwhich third component is a 1,4-diketopyrrolo[3,4-c]pyrrole different from I and II of the formula ##STR37## wherein X and Y are each independently a group of formula ##STR38## with R.sub.1 and R.sub.2 having the same meaning given above; wherein the ternary solid solution has an x-ray diffraction pattern that is essentially the same as the x-ray diffraction pattern exhibited by a mixed crystal composed of an equimolar amount of (I) and (II); with the proviso that the third component is not a disubstituted quinacridone when components (I) and (II) are 1,4-diketo-3,6-diphenylpyrrolo[3,4-c]pyrrole and 1,4-diketo-3,6-di(4-chlorophenyl)pyrrolo[3,4-c]pyrrole.