Ink, ink container, ink set, ink jet printing apparatus, and ink jet printing method
AssigneeCanon Kabushiki Kaisha
InventorsNoribumi Koitabashi, Yoshihisa Takizawa, Yutaka Kurabayashi, Takeo Eguchi
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Abstract
An ink of the present invention has a dye and a pigment. The pigment is a self-dispersant type pigment and an anionic dye in which at least one anionic group is bound on a surface of the pigment directly or through another atomic group and having a Ka value of less than 1 ml·m−2·msec−½ according to a Bristow method. An image having an excellent image quality is formed by using such an ink in the process of ink jet recording.
Claims48
An aqueous ink, comprising:
- an anionic dye;
- a self-dispersant pigment having an anionic group bonded directly or through an atomic group to a surface of the pigment;
- and
- at least two kinds of organic solvents,
- wherein the ink has a Ka value of less than 1 ml·m−2·msec−½ according to the Bristow method, and
- wherein the ink is free from any dispersants for the pigments.
An aqueous ink for use in an ink-jet image forming process, the ink being ejected from an orifice by an ink jet ejecting process, and the ink comprising:
- an anionic dye;
- a self-dispersant pigment having an anionic group bonded directly or through an atomic group to a surface of the pigment;
- and
- at least two kinds of organic solvents,
- wherein the ink has a Ka value of less than 1 ml·m−2·msec−½ according to the Bristow method, and
- wherein the ink is free from any dispersants for the pigments.
An ink-jet printing process comprising the steps of:
- i) ejecting an aqueous ink by an ink jet recording process;
- and
- ii) applying the aqueous ink on a printing medium,
- wherein the aqueous ink comprises:
- an anionic dye;
- a self-dispersant pigment having an anionic group bonded directly or through an atomic group to a surface of the pigment;
- and
- at least two kinds of organic solvents,
- wherein the ink has a Ka value of less than 1 ml·m−2·msec−½ according to the Bristow method, and
- wherein the ink is free from any dispersants for the pigments.
An ink jet printing process comprising the steps of:
- i) ejecting an aqueous ink towards a coated layer containing a resin by an ink jet ejecting process, the coated layer constituting an outer surface of a printing medium;
- and
- ii) forming an image on the outer surface of the printing medium,
- wherein the aqueous ink comprises:
- an anionic dye;
- a self-dispersant pigment having an anionic group bonded directly or through an atomic group to a surface of the pigment;
- and
- at least two kinds of organic solvents,
- wherein the ink has a Ka value of less than 1 ml·m−2·msec−½ according to the Bristow method, and
- wherein the ink is free from any dispersants for the pigments.
An ink tank containing an aqueous ink, wherein the aqueous ink comprises:
- an anionic dye;
- a self-dispersant pigment having an anionic group bonded directly or through an atomic group to a surface of the pigment;
- and
- at least two kinds of organic solvents,
- wherein the ink has a Ka value of less than 1 ml·m−2·msec−½ according to the Bristow method, and
- wherein the ink is free from any dispersants for the pigments.
An ink set comprising an aqueous black ink, and at least one aqueous color ink selected from the group consisting of a yellow ink, a magenta ink, and a cyan ink,
- wherein the aqueous black ink comprises:
- an anionic dye;
- a self-dispersant carbon black having an anionic group bonded directly or through an atomic group to a surface of the carbon black;
- and
- at least two kinds of organic solvents,
- wherein the ink has a Ka value of less than 1 ml·m−2·msec−½ according to the Bristow method, and
- wherein the ink is free from any dispersants for the pigments.
An ink jet recording apparatus comprising four ink containers, each of which contains an aqueous black ink, a yellow ink, a magenta ink, and a cyan ink, and means for ejecting the respective inks independently by an ink jet ejecting process,
- wherein the aqueous black ink comprises:
- an anionic dye;
- a self-dispersant carbon black having an anionic group bonded directly or through an atomic group to a surface of the carbon black;
- and
- at least two kinds of organic solvents,
- wherein the ink has a Ka value of less than 1 ml·m−2·msec−½ according to the Bristow method, and
- wherein the ink is free from any dispersants for the pigments.
Dependencies are inferred from the claim text.