Ink, ink container, ink set, ink-jet printing apparatus and ink-jet printing process
AssigneeCanon Kabushiki Kaisha
InventorsNoribumi Koitabashi, Sadayuki Sugama, Yoshihisa Takizawa, Hitoshi Tsuboi
Life of this patent
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Abstract
Disclosed herein is an ink comprising a first pigment, a second pigment and a dispersant, both of the pigment being dispersed in an aqueous medium, wherein the first pigment is a self-dispersing pigment having an anionic group or a cationic group, the group being bonded directly or through an atomic group to a surface of the pigment, the second pigment is a pigment dispersible in an aqueous medium with the dispersant, and the dispersant is an ionic polymeric dispersant having a same polarity as that of the group bonded to the surface of the pigment or a nonionic polymeric dispersant.
Claims88
An ink comprising a first pigment, a second pigment and a dispersant, both of the pigments being dispersed in an aqueous medium,
- wherein the first pigment is a self-dispersing pigment having an anionic group or a cationic group, the group being bonded directly or through an atomic group to a surface of the first pigment,
- the second pigment is a pigment dispersible in an aqueous medium with the dispersant, and
- the dispersant is an ionic polymeric dispersant having a same polarity as that of the group bonded to the surface of the first pigment or a nonionic polymeric dispersant.
An ink used in an image printing process comprising the steps of ejecting an ink from an orifice by means of an ink-jet system;
- applying the ink to a printing medium;
- and forming an element of an image, the ink comprising a first pigment, a second pigment and a dispersant, both of the pigments being dispersed in an aqueous medium, wherein the first pigment is a self-dispersing pigment having an anionic group or a cationic group, the group being bonded directly or through an atomic group to a surface of the first pigment, the second pigment is a pigment dispersible in an aqueous medium with the dispersant, and the dispersant is an ionic polymeric dispersant having a same polarity as that of the group bonded to the surface of the first pigment or a nonionic polymeric dispersant.
An ink-jet printing process comprising the steps of ejecting an ink toward a printing medium by means of an ink-jet system;
- and forming an image on the printing medium, wherein the ink comprises a first pigment, a second pigment and a dispersant, both of the pigments being dispersed in an aqueous medium, wherein the first pigment is a self-dispersing pigment having an anionic group or a cationic group, the group being bonded directly or through an atomic group to a surface of the first pigment, the second pigment is a pigment dispersible in an aqueous medium with the dispersant, and the dispersant is an ionic polymeric dispersant having a same polarity as that of the group bonded to the surface of the first pigment or a nonionic polymeric dispersant.
An ink-jet printing process comprising the steps of ejecting an ink toward an outer surface of a coating layer of a printing medium provided with the coating layer by means of an ink-jet system;
- and
- forming an image on the outer surface of the coating layer, wherein the ink comprises a first pigment, a second pigment and a dispersant, both of the pigments being dispersed in an aqueous medium, wherein the first pigment is a self-dispersing pigment having an anionic group or a cationic group, the group being bonded directly or through an atomic group to a surface of the first pigment, the second pigment is a pigment dispersible in an aqueous medium with the dispersant, and the dispersant is an ionic polymeric dispersant having a same polarity as that of the group bonded to the surface of the first pigment or a nonionic polymeric dispersant.
An image forming process comprising the steps of:
- (i) providing a first ink containing an aqueous medium and a first pigment which is a self-dispersing pigment dispersible in the aqueous medium by itself, the first pigment having an anionic group or a cationic group, and the group being bonded directly or through an atomic group to a surface of the first pigment;
- (ii) providing a second ink containing an aqueous medium and a second pigment dispersible in the aqueous medium with a dispersant, the dispersant being at least one of a nonionic polymeric dispersant and an ionic polymeric dispersant having a same polarity as that of the group bonded to the pigment in the first ink;
- (iii) applying the first ink and the second ink on a printing medium respectively so that the first ink and the second ink come into contact with each other in liquid state on a surface of the printing medium;
- and
- (iv) forming an image on the recording medium.
An image forming process comprising the steps of:
- (i) providing a first ink containing an aqueous medium and a first pigment which is a self-dispersing pigment dispersible in the aqueous medium by itself, the pigment having an anionic group or a cationic group, and the group being bonded directly or through an atomic group to a surface of the first pigment;
- (ii) providing a second ink containing an aqueous medium and a second pigment dispersible in the aqueous medium with a dispersant, the dispersant being at least one of a nonionic polymeric dispersant and an ionic polymeric dispersant having a same polarity as that of the group bonded to the pigment in the first ink;
- (iii) providing a third ink containing a dye having a same polarity as that of the group bonded to the pigment in the first ink;
- (iv) applying the first, second and third inks to a printing medium so that the inks come into contact with each other in liquid state on a surface of the printing medium.
An ink container containing an ink therein, wherein the ink comprises a first pigment, a second pigment and a dispersant, both of the pigments being dispersed in an aqueous medium, wherein the first pigment is a self-dispersing pigment having an anionic group or a cationic group, the group being bonded directly or through an atomic group to a surface of the first pigment, the second pigment is a pigment dispersible in an aqueous medium with the dispersant, and the dispersant is an ionic polymeric dispersant having a same polarity as that of the group bonded to the surface of the first pigment or a nonionic polymeric dispersant.
An ink set comprising, in combination, a black ink which comprises a first pigment, a second pigment and a dispersant, both of the pigments being dispersed in an aqueous medium, wherein the first pigment is a self-dispersing carbon black having an anionic group or a cationic group, the group being bonded directly or through an atomic group to a surface of the first pigment, the second pigment is a pigment dispersible in an aqueous medium with the dispersant, and the dispersant is an ionic polymeric dispersant having a same polarity as that of the group bonded to the surface of the first pigment or a nonionic polymeric dispersant, and at least one ink selected from the group consisting of a yellow ink, a magenta ink and a cyan ink.
An ink-jet printing apparatus comprising ink container portions which separately contain a black ink comprising a first pigment, a second pigment and a dispersant, both of the pigments being dispersed in an aqueous medium, wherein the first pigment is a self-dispersing carbon black having an anionic group or a cationic group, the group being bonded directly or through an atomic group to a surface of the first pigment, the second pigment is a pigment dispersible in an aqueous medium with the dispersant, and the dispersant is an ionic polymeric dispersant having a same polarity as that of the group bonded to the surface of the first pigment or a nonionic polymeric dispersant, a yellow ink, a magenta ink and a cyan ink therein, and means for respectively ejecting the black, yellow, magenta and cyan inks by an ink-jet system.
Dependencies are inferred from the claim text.