| 摘要 |
<p>Provided are a pigment dispersion and an aqueous inkjet-recording ink which employs said pigment dispersion. The pigment dispersion makes it possible to obtain a uniform printed image wherein lines and irregularities are suppressed without the particle size of the pigment dispersion changing even after long-term storage or exposure to high temperatures, and also makes it possible to produce an aqueous ink for inkjet recording which has excellent light fastness. A pigment dispersion of vinyl polymer particles contains the following components A and B. A: an azo pigment represented by general formula (1), a tautomer thereof, salts thereof, hydrates thereof, or solvates thereof; and B: a vinyl polymer including (a) a structural unit having a non-aromatic cycloaliphatic group bonded to a polymer main chain through a linking group, and (b) a structural unit having a hydrophilic group. (1) (In general formula (1), Q represents a non-metallic atom group needed to form a 5 to 7-membered heterocycle with a carbon atom, W represents an alkoxy group, an amino group, an alkyl group, or an aryl group, X1 and X2 represent independently a hydrogen atom, an alkyl group, an acyl group, an alkyl sulfonyl group or an aryl sulfonyl group, R1 represents a hydrogen atom or a substituent group, R2 represents a heterocyclic group, and n represents an integer between 1 and 4. The azo pigment represents a dimer using Q, W, X1, X2, R1, or R2 if n=2. The azo pigment represents a trimer using Q, W, X1, X2, R1, or R2 if n=3. The azo pigment represents a tetramer using Q, W, X1, X2, R1, or R2 if n=4.)</p> |
