Water-insoluble violet benzimidazolone monoazo pigments

Details Water-insoluble violet benzimidazolone monoazo pigments Water-insoluble violet benzimidazolone monoazo pigments

C - Chemistry, Metallurgy

09

B

C09B 29/036 (2006.01) C09B 29/00 (2006.01) C09B 29/20 (2006.01)

Patent

CA 2440535

Water-insoluble violet benzimidazolone monoazo pigments of the formula: Image wherein R1, R2 and R3 each represent hydrogen, chlorine, bromine, methyl, methoxy, ethoxy, vitro or a group of the formula -COOR with R being hydrogen, methyl or ethyl, and R4 represents hydrogen, chlorine, bromine, methyl, methoxy, ethoxy or vitro group. Due to the presence of two 5-membered heterocyclic rings in the molecule, these pigments display veryhigh thermoresistance and excellent fastness to migration.

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