| abstract |
A magenta pigment ink having high gloss on glossy paper, high color development on plain paper, and fixing properties while ensuring ink reliability such as clogging recovery and ink deposition. It is possible to provide an ink composition capable of improving the viscosity. An ink composition comprising at least a magenta pigment, a polymer capable of dispersing the pigment in the ink composition, a water-insoluble vinyl polymer different from the polymer, and water. The insoluble vinyl polymer is a polymer obtained by polymerizing a monomer composition containing [1] an aromatic vinyl monomer and [2] a monomer copolymerizable with the aromatic vinyl monomer, and having a minimum film-forming temperature Is 20 ° C. or less, and the average particle size of the water-insoluble vinyl polymer is 30 to 70 nm. [Selection figure] None |