Water-insoluble violet benzimidazolone monoazo pigments
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United States of America Patent
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Mar 16, 2004
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N/A
app pub date -
Feb 20, 2003
filing date -
Feb 20, 2003
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Expired
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Abstract
Water-insoluble violet benzimidazolone monoazo pigments of the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represent hydrogen, chlorine, bromine, methyl, methoxy, ethoxy, nitro or a group of the formula --COOR with R being hydrogen, methyl or ethyl, and R.sub.4 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.
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