DISAZO PIGMENT WITH IMPROVED HEAT RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a disazo pigment capable of preparing printing ink excellent in transparency and fluidity and in heat resistance to heat applied in order to make ink flow during production of ink. SOLUTION: This disazo pigment is obtained by coupling a coupler component with a tetrazo component of benzidines. The disazo pigment is characterized by comprising a compound represented by a general formula (1) CH3COCH2 CONH-X (X is phenyl group which may have a substituent group) and a compound represented by a general formula (2) Y-NH2 (Y is phenyl group which may have a substituent group) and further comprising both or either one of the compound represented by a general formula (3) CH3COCH2CONH-W (W is a carbonamide groups, sulfonamide groups or alkanoylamino groups- substututed phenyl group and a compound represented by a general formula (4) CH3COCH2CONH-Z (Z is carboxylic acid group, hydroxyl group or sulfonic acid group-substituted phenyl group or phenyl group substituted with alkali metal salt thereof).