Patent ID: 8641785

Claim:
An aqueous pigment dispersion comprising A and B, wherein A is an azo pigment represented by the following general formula (1) and in a crystal form having at least one characteristic peak at Bragg angles (2θ) of 5 to 15° and 20 to 30° in X-ray diffraction with characteristic Cu Kα line, a tautomer thereof, or a salt or hydrate thereof; and B is a vinyl polymer containing a structural unit represented by the following general formula (A1), a structural unit derived from a salt-forming group-containing monomer (a), and a structural unit derived from a monomer selected from a styrene series macromer (b) and a hydrophobic monomer (c), provided that the water-insoluble vinyl polymer has at least either of 2 or more hydroxyl groups and 1 or more carboxyl groups at the end of the main chain: wherein, Z represents a 5- to 6-membered heterocyclic ring, Y 1 , Y 2 , R 11 , and R 12 each independently represents a hydrogen atom or a substituent, G 1 and G 2 each independently represents 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 represents an alkoxy group, an amino group, an alkyl group, or an aryl group); wherein, R 1 represents a hydrogen atom or a methyl group, and R 2 represents an arylalkyl group which may have a substituent.