Inventors:
Fridolin Babler - Hockessin DE
Charles G. Orange - Bear DE
Assignee:
Ciba-Geigy Corporation - Ardsley NY
International Classification:
C09B 4800
Abstract:
The present invention relates to a heat stable red pigment composition comprising a 2,9-dichloroquinacridone and a bis-(4, 5,6,7-tetrachloroisoindolin-1-on-3-ylidene)-phenylene-1,4-diamine pigment and a process for its preparation. The red pigment compositions are particularly useful for pigmenting engineering plastics.