Patent ID: 7094281
Filing Date: 2006-08-22
Classification: C09D

Abstract:
1. A black ink composition obtained by mixing: at least one colorant selected from the group consisting of compounds represented by the below-shown formula (1) and salts thereof; one or more organic acids; and one or more organic bases: wherein R 1 represents a phenyl group having a substituent group or a naphthyl group having a substituent group, R 2 represent a phenylene group having a substituent group or a naphthylene group having a substituent group, R 3 represents a 5- to 7-membered heterocyclic ring having at least one double bond and substituent group, and further, the above-mentioned substituent groups in the above-mentioned R 1 to R 3 are each independently selected from the group consisting of OH, SO 3 H, PO 3 H 2 , CO 2 H, NO 2 , NH 2 , a C1–4 alkyl group, a C1–4 alkyl group having a substituent group, a C1–4 alkoxyl group, a C1–4 alkoxyl group having a substituent group, an amino group, an amino group having a substituent group and a phenyl group having a substituent group.