Patent ID: 7420006
Filing Date: 2008-09-02
Classification: C09D,D06P

Abstract:
1. A color ink set comprising a black ink and a color ink that is different from the black ink, wherein: the black ink comprises a black pigment, resin particles having carboxyl groups, a first pH-adjusting agent, a first water-soluble organic solvent, a first dispersing agent, and water, the resin particles comprising at least one member selected from the group consisting of polyester resin particles, polyurethane resin particles, and polyolefin resin particles, the resin particles contained in the black ink being formed of a binding resin; the color ink comprises a coloring pigment, resin particles, a second pH-adjusting agent, a second water-soluble organic solvent, a second dispersing agent, and water; the resin particles contained in the color ink are different than the resin particles contained in the black ink and are acrylic resin particles; and a pH of the black ink is not less than 7.8, and a pH of the color ink is not more than 4.5.