| 摘要 |
<p>The present invention provides an aqueous ink composition including:
a coloring material containing at least one of an azo pigment represented by the following formula (1), a tautomer thereof, a salt of the pigment or the tautomer, or a hydrate of the pigment or the tautomer;
a dispersant,; and
colloidal silica:
wherein Z represents a divalent group derived from a 5- to 8-membered nitrogen-containing heterocyclic ring; Y 1 , Y 2 , R 11 and R 12 each independently represent a hydrogen atom or a substituent; G 1 and G 2 each independently represent a hydrogen atom, an alkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group; and W 1 and W 2 each independently represent an alkoxy group, an amino group, an alkyl group or an aryl group.</p> |
