Patent number: 6540820
Abstract: Compounds of the formula:
where R1, R2, R3, R4, R5, R6, R7, R8, R′5, R′6, R′7, R′8 are hydroxy —NO2, —CN, —CF3, —CONH2, C1-12alkyl, phenyl, naphthyl, phenanthryl, anthryl, R9R10N—, R9—O—or R9—S—, —CONHR10, —CONR9R10 in which R9 and R10 are C1-C6-alkyl, C6-C10-aryl, (C6-C10)-aryl-(C1-C6)-alkyl or (C1-C6)-alkyl-(C6-C10)-aryl, in which the alkyl and/or aryl radicals can optionally be substituted by hydroxyl, C1-C6-alkoxy, C6-C10-aryloxy or halogen; and optionally, two adjacent groups can form an isocyclic or heterocyclic group;
are eminently suitable for the mass coloring of polymers, in particular polar polymers, for coloring toners, powders and powder coating materials as well as for coloring ink-jet inks.
Type:
Grant
Filed:
June 8, 2000
Date of Patent:
April 1, 2003
Assignee:
Clariant Finance (BVI) Limited
Inventors:
Bansi Lal Kaul, Bruno Piastra, Valérie Wolf