Patent ID: 7691192
Filing Date: 2010-04-06
Classification: C09D

Abstract:
1. An ink composition comprising at least water, a cyan dye represented by formula (II) shown below, and an aromatic compound having a carboxyl group and/or a salt thereof: wherein R 1 to R 4 each independently represents SO 2 Z and each Z independently represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group, provided that at least one of the Z's has an ionic hydrophilic group as a substituent; and M represents a hydrogen atom, a metal element or an oxide, hydroxide or halide thereof.