Patent ID: 9045660
Filing Date: 2015-06-02
Classification: C09D

Abstract:
1. An ink set for an ink jet comprising: a combination of a first ink and a second ink, wherein the first ink comprises a self-dispersible pigment and a particle A, the self-dispersible pigment being a carbon black having an anionic group bonded to a surface thereof directly or through another atomic group, and the particle A being at least one selected from the group consisting of a resin particle having an anionic group and a pigment dispersed by a water-soluble resin having an anionic group; a content of the particle A in the first ink is 0.05% by mass or more and 0.50% by mass or less, and a mass ratio of the content of the particle A in % by mass to a content of the self-dispersible pigment in % by mass, in the first ink, is 0.056 times or more and 0.250 times or less; the second ink comprises a particle B, the particle B being at least one selected from the group consisting of a resin particle having an anionic group and a pigment dispersed by a water-soluble resin having an anionic group; and an acid value a of the particle A and an acid value b of the particle B satisfy a relation of a≦b.