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US6652084B1
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Ink-set, ink-jet recording method, recording unit, ink-cartridge, ink-jet recording apparatus and bleeding reduction method using it
Assignee: Canon Inc
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Filing: 2000-09-29
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Granted: 2003-11-25
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Expires: 2020-09-29
Abstract
Abstract An ink set for recording a color image on a recording medium by using ink of two or more colors including at least a black ink and a color ink, wherein the black ink includes a pigment having a cationic group or a pigment and a pigment dispersant having a cationic group, and a resin encapsulating a coloring material, and the color ink includes an anionic dye and an anionic substance, which can form a print excellent in the rub-off resistance and line marker resistance without bleeding between black and color images.
Inventors
- 👤 Hisashi Teraoka
- 👤 Yoichi Takada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:52
CPC Classifications
B; B41; B41M; B41M7/00; B41M7/0018; C; C09; C09D; C09D11/00; C09D11/30; C09D11/40; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2002/14169; B41J2002/14475; B41M5/00; B41M5/0011; B41M5/0017; B41M5/0023
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
108 words
An ink set comprising only one black ink for recording a black image and a color ink for recording a color image, wherein the black ink comprises: a pigment having a cationic group or a pigment and a pigment dispersant having a cationic group; and a resin encapsulating a coloring material; wherein the color ink comprises an anionic dye and an anionic substance derived from an organic acid salt; whereby bleed at a boundary between the black image and the color image is reduced by an ionic reaction between the cationic group in the black ink and the anionic dye and the anionic substance in the color ink.
Claim 2
Dependent Claim
108 words
An ink set comprising only one black ink for recording a black image and a color ink for recording a color image, wherein the black ink comprises: a pigment having a cationic group or a pigment and a pigment dispersant having a cationic group; and a resin encapsulating a coloring material; wherein the color ink comprises an anionic dye and an anionic substance derived from an organic acid salt; whereby bleed at a boundary between the black image and the color image is reduced by an ionic reaction between the cationic group in the black ink and the anionic dye and the anionic substance in the color ink.
Claim 3
Dependent Claim
14 words
The ink set according to claim 1 , wherein the pigment is carbon black.
Claim 4
Dependent Claim
34 words
The ink set according to claim 1 , wherein the pigment is a self-dispersible carbon black having at least one cationic hydrophilic group bonded to a surface thereof directly or via another atomic group.
Claim 5
Dependent Claim
24 words
The ink set according to claim 1 , wherein the coloring material encapsulated in the resin is an oil-soluble dye or a second pigment.
Claim 6
Dependent Claim
24 words
The ink set according to claim 1 , wherein the resin encapsulating the coloring material has a cationic hydrophilic group on a surface thereof.
Claim 7
Dependent Claim
20 words
The ink set according to claim 1 , wherein the coloring material has substantially the same color as the pigment.
Claim 8
Dependent Claim
21 words
The ink set according to claim 1 , wherein the coloring material is encapsulated by a microcapsule made of the resin.
Claim 9
Dependent Claim
16 words
The ink set according to claim 1 , wherein the anionic substance has a carboxyl group.
Claim 10
Dependent Claim
16 words
The ink set according to claim 1 , wherein the anionic substance has a sulfo group.
Claim 11
Dependent Claim
18 words
The ink set according to claim 9 , wherein the anionic substance has a plurality of sulfo groups.
Claim 12
Dependent Claim
29 words
The ink set according to claim 1 , wherein the anionic substance in the color ink is an aromatic compound substituted with a sulfo group on an aromatic ring.
Claim 13
Dependent Claim
23 words
The ink set according to claim 1 , wherein the anionic dye in the color ink is a dye having a sulfo group.
Claim 14
Dependent Claim
18 words
The ink set according to claim 1 , wherein the ink set is used for ink jet recording.
Claim 15
Dependent Claim
29 words
A recording unit comprising: a first ink container containing the black ink of claim 1 ; and a second ink container containing the color ink of claim 1 .
Claim 16
Dependent Claim
29 words
An ink cartridge comprising: a first ink container containing the black ink of claim 1 ; and a second ink container containing the color ink of claim 1 .
Claim 17
Dependent Claim
72 words
An ink jet recording apparatus for reducing bleed at a boundary between a black image and a color image, comprising the ink set of claim 1 , an ink jet head for ejecting the black and color inks of the ink set according to claim 1 respectively, and means for controlling the ejection of the respective inks so that the black and color inks react with each other ionically at the boundary.
Claim 18
Dependent Claim
133 words
A process for forming an image including a black image and a color image adjacent the black image, comprising the steps of: forming the black image by ejecting only one black ink by an ink jet method; and forming the color image by ejecting a color ink by an ink jet method, wherein the black ink comprises a pigment having a cationic group or a pigment and a pigment-dispersant having a cationic group, and a resin encapsulating a coloring material, and the color ink comprises an anionic dye and an anionic substance derived from an organic acid salt, and wherein the cationic group in the ejected black ink and the anionic dye and the anionic substance in the color ink react ionically at a boundary of the black image and the color image.
Claim 19
Dependent Claim
133 words
A process for forming an image including a black image and a color image adjacent the black image, comprising the steps of: forming the black image by ejecting only one black ink by an ink jet method; and forming the color image by ejecting a color ink by an ink jet method, wherein the black ink comprises a pigment having a cationic group or a pigment and a pigment-dispersant having a cationic group, and a resin encapsulating a coloring material, and the color ink comprises an anionic dye and an anionic substance derived from an organic acid salt, and wherein the cationic group in the ejected black ink and the anionic dye and the anionic substance in the color ink react ionically at a boundary of the black image and the color image.
Claim 20
Dependent Claim
23 words
The ink jet recording method according to claim 17 , wherein ink is ejected in droplets by applying thermal energy to the ink.
Claim 21
Independent Claim
111 words
A method for alleviating bleeding in a boundary between a black image formed by an ink-jet method with only one cationic black ink and a color image formed by an ink-jet method with an anionic color ink, the black ink comprising a pigment having a cationic group or a pigment and a pigment-dispersant having a cationic group and a resin encapsulating a coloring material, the color ink comprising an anionic dye and an anionic substance derived from an organic acid salt, the method comprising the step of reacting the cationic group in the black ink and the anionic dye and the anionic substance in the color ink ionically at the boundary.
Claim 22
Independent Claim
111 words
A method for alleviating bleeding in a boundary between a black image formed by an ink-jet method with only one cationic black ink and a color image formed by an ink-jet method with an anionic color ink, the black ink comprising a pigment having a cationic group or a pigment and a pigment-dispersant having a cationic group and a resin encapsulating a coloring material, the color ink comprising an anionic dye and an anionic substance derived from an organic acid salt, the method comprising the step of reacting the cationic group in the black ink and the anionic dye and the anionic substance in the color ink ionically at the boundary.
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