Mixed crystals of different benzimidazolone-dioxazine compounds give fast red shades e.g. for pigmenting plastics or use in toners or developers, are obtained by co-synthesis, acidic cyclization, precipitation or sublimation

摘要

Mixed crystals consist of - 2 different benzimidazolone-dioxazine compounds. Mixed crystals consist of - 2 different benzimidazolone-dioxazine compounds of formula (I). Independent claims are also included for preparation of such crystals. X and X' = H or halogen; R1, (R1)' , R2 and (R2)' = H, 1-18C alkyl or alkylcarbonyl, CF3, 5 or 6C cycloalkyl or phenyl optionally substituted by - 1 halogen, NO2, CF3 or 1-18C alkyl, alkoxy, alkylcarbonyl or alkoxycarbonyl.