Patent ID: 8641785
Filing Date: 2014-02-04
Classification: C09B,C09D

Abstract:
1. 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 wherein, R