Perylene-1,2,3,4-tetracarboxylic acid → Octadecylamine

Participants

Reaction Steps

The alkaline perylenetetracarboxylic acid solution is added dropwise to the stearylamine/isopropanol/hydrochloric acid suspension in the course of 15 minutes at 60° C., whereupon the perylenetetracarboxylic acid precipitates. The formation of the anhydride imide is brought to completion by boiling the still acid suspension for 3 hours at reflux temperature. The red pigment suspension is filtered at about 70° C. The filter cake is washed neutral with cold water and dried in a vacuum cabinet at 80° C., affording 28.8 parts of stearylamine-modified perylene-3,4,9,10-tetracarboxylic dianhydride pigment. When incorporated in powder form in plasticised PVC rolled sheets, this pigment produces strong, red colourations of excellent fastness properties and has extremely good dispersibility.

Provenance & Evidence