Methyl Benzoate → C.I. Pigment Blue 60

Participants

Reaction Conditions

Reaction Steps

A black indanthrone compound was prepared by adding 114.4 parts 2-amino-2,4-dibromoanthraquinone and 57.4 parts 4-phenoxyaniline in 875 parts methyl benzoate to 58.8 parts potassium acetate and 3 parts cupric acetate. This mixture was then heated with stirring to 135-140 degrees C. for 7 hours at which time another 220 parts methyl benzoate was added. Stirring at 135-140 degrees C. continued for an additional 6 hours. The mixture was cooled to room temperature and 58.8 parts potassium acetate was added. The mixture was then heated to reflux using a Dean-Stark trap to remove low boiling by products which permitted the temperature in the flask to remain at 196-198 degrees C. The mixture was stirred at reflux for 1.5 hours and cooled with stirring. The product was isolated as in Example 2 and gave a similar yield of a black dye composition consisting mainly of 8,17-bis(4-phenoxyphenylamino)indanthrone.

Provenance & Evidence