Back to results
US 6,706,864 B1Granted
Water-insoluble violet benzimidazolone monoazo pigments
AssigneeDominion Colour Corporation
InventorsMark J. Vincent, Helen Skelton, Jaroslav Slupecky, Justin Yee
Life of this patent
Estimating the term…
Abstract
Water-insoluble violet benzimidazolone monoazo pigments of the formula: wherein R1, R2 and R3 each represent hydrogen, chlorine, bromine, methyl, methoxy, ethoxy, nitro or a group of the formula —COOR with R being hydrogen, methyl or ethyl, and R4 represents hydrogen, chlorine, bromine, methyl, methoxy, ethoxy or nitro group. Due to the presence of two 5-membered heterocyclic rings in the molecule, these pigments display very high thermoresistance and excellent fastness to migration.
Claims4
A water-insoluble violet benzimidazolone monoazo pigment of the formula:
- wherein P1, R2 and R3 each represent hydrogen, chlorine, bromine, methyl, methoxy, ethoxy or a group of the formula —COOR with R being hydrogen, methyl or ethyl, and R4 represents hydrogen, chlorine, bromine, methyl, methoxy or ethoxy group.
Dependencies are inferred from the claim text.