Mixed crystals of sulfonated diketopyrrolopyrroles

U.S. Patent Number: 5380870

Abstract: Mixed crystals of at least two different compounds of formula ##STR1## wherein A and B are each independently of the other a cation of formula ##EQU1## or N.sup.+ H(R.sub.1)(R.sub.2)(R.sub.3) M is a mono-, di- or trivalent metal cation, n is 1, 2 or 3, R.sub.1, R.sub.2 and R.sub.3 are each independently of one another hydrogen, C.sub.1 -C.sub.22 alkyl, C.sub.7 -C.sub.24 aralkyl, C.sub.5 -C.sub.6 cycloalkyl or C.sub.6 -C.sub.18 aryl, m is 0 or 1, and R is hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy, in which compounds of formula I that form the mixed crystals the cations A and B constitute a composite structure ##EQU2## wherein x is a value from 0.2 to 0.8, and the X-ray diffraction pattern of said mixed crystals differs from that of the corresponding compounds in which x is 1 or 0. These mixed crystals can be used as pigments for colouring organic material of high molecular weight and have exceptional properties, especially dispersibility, heat- and lightfastness.

Inventors: Hari; Stefan (Reinach, CH), Wallquist; Olof (Marly, CH), Herren; Fritz (Dudingen, CH), Eichenberger; Thomas (Basel, CH)

Assignee: Ciba-Geigy Corporation (Ardsley, NY)

Application Number: 08/166,750

Issued: 1995-01-10

Expired: 2007-01-10

Classes: 548/453 ; 106/493; 106/494; 106/498

Field of search: 548/453

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