Patent ID: 8586648
Filing Date: 2013-11-19
Classification: C09D

Abstract:
1. An aqueous colorant dispersion comprising a colorant (A), a polymer (B), and an aqueous liquid medium (I), wherein the polymer (B) is a copolymer including a hydrophilic structural unit and a hydrophobic structural unit, the content of the hydrophobic structural unit in the polymer (B) being more than 80% by mass but less than 100% by mass, the hydrophobic structural unit includes a hydrophobic structural unit (a) having an aromatic ring linked via a linking group to an atom included in the main chain of the polymer (B), the content of aromatic rings in the polymer (B) is 10% by mass or more but less than 20% by mass with respect to the mass of the polymer (B), the hydrophilic structural unit includes a hydrophilic structural unit (b) including an ionic group, and the polymer (B) includes a structural unit (c) different from the hydrophobic structural unit (a) and from the hydrophilic structural unit (b), the content of the structural unit (c) in the polymer (B) being more than 15% by mass but 45% by mass or less, wherein the structural unit (c) includes a hydrophobic structural unit derived from a C1 to C6 alkyl acrylate or methacrylate, wherein the hydrophobic structural unit (a) comprises a structural unit represented by the following formula (2): wherein R