US6790878B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink, ink set, ink cartridge, recording unit, image recording process and image recording apparatus
Assignee: Canon Inc
•
Filing: 1999-04-01
•
Granted: 2004-09-14
•
Expires: 2019-04-01
Abstract
Abstract Disclosed herein is an ink comprising a pigment and a resin encapsulating a coloring material. The ink can provide an image high in optical density and excellent in rub-off resistance, water fastness and resistance to line marker, and exhibits excellent ejection stability from a recording head when used in ink-jet recording.
Inventors
- 👤 Yutaka Kurabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:34
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; C09D11/40
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
135 words
An aqueous ink for an ink-jet printing process comprising: a self-dispersing pigment and a resin encapsulating a coloring material, both of which are dispersed in an aqueous medium such that the total amount of the solid concentration of the self-dispersing pigment and the resin encapsulating a coloring material is 8 percent by weight based on the total weight of the ink, the resin encapsulating the coloring material being contained in a sufficient amount to provide rub-resistance to an image produced with the ink, wherein the ink provides an ink jet recorded image with a certain optical density that is equivalent to that produced with an ink containing the self-dispersing pigment as a sole colorant at the solid concentration of 8 percent, and wherein the encapsulated coloring material is an oil-soluble dye or a water-insoluble pigment.
Claim 2
Dependent Claim
135 words
An aqueous ink for an ink-jet printing process comprising: a self-dispersing pigment and a resin encapsulating a coloring material, both of which are dispersed in an aqueous medium such that the total amount of the solid concentration of the self-dispersing pigment and the resin encapsulating a coloring material is 8 percent by weight based on the total weight of the ink, the resin encapsulating the coloring material being contained in a sufficient amount to provide rub-resistance to an image produced with the ink, wherein the ink provides an ink jet recorded image with a certain optical density that is equivalent to that produced with an ink containing the self-dispersing pigment as a sole colorant at the solid concentration of 8 percent, and wherein the encapsulated coloring material is an oil-soluble dye or a water-insoluble pigment.
Claim 3
Dependent Claim
34 words
The ink according to claim 1 , wherein the self-dispersing pigment is a self-dispersing carbon black to the surface of which at least one hydrophilic group is bonded directly or through another atomic group.
Claim 4
Dependent Claim
13 words
The ink according to claim 2 , wherein the hydrophilic group is anionic.
Claim 5
Dependent Claim
23 words
The ink according to claim 3 , wherein the resin encapsulating a coloring material has an anionic hydrophilic group at the surface thereof.
Claim 6
Dependent Claim
13 words
The ink according to claim 2 , wherein the hydrophilic group is cationic.
Claim 7
Dependent Claim
23 words
The ink according to claim 5 , wherein the resin encapsulating a coloring material has a cationic hydrophilic group at the surface thereof.
Claim 8
Dependent Claim
32 words
The ink according to claim 2 , further comprising a pigment dispersant having an anionic hydrophilic group when the hydrophilic group bonded to the surface of the self-dispersing carbon black is anionic.
Claim 9
Dependent Claim
32 words
The ink according to claim 2 , further comprising a pigment dispersant having a cationic hydrophilic group when the hydrophilic group bonded to the surface of the self-dispersing carbon black is cationic.
Claim 10
Dependent Claim
51 words
An image recording process comprising the step of applying at least two color inks to a recording medium using an ink-jet method to form a multi-color image, wherein one ink is an ink according to claim 5 or 8 , and the other ink comprises a compound having an anionic group.
Claim 11
Dependent Claim
44 words
An image recording apparatus, comprising: ink containers containing first and second inks respectively, and a recording head for ejecting the respective inks, wherein the first ink is an ink according to claim 5 or 8 , and the second ink is an anionic ink.
Claim 12
Dependent Claim
12 words
The ink according to claim 1 , further comprising a pigment dispersant.
Claim 13
Dependent Claim
18 words
The ink, according to claim 1 , wherein the pigment and the coloring material have the same color.
Claim 14
Dependent Claim
20 words
The ink according to claim 1 , wherein the coloring material is encapsulated in a microcapsule made of the resin.
Claim 15
Dependent Claim
15 words
An ink cartridge, comprising an ink container containing an ink according to claim 1 .
Claim 16
Dependent Claim
32 words
A recording unit, comprising: an ink container containing an ink according to claim 1 , a recording head, and means for feeding the ink from the ink container to the recording head.
Claim 17
Dependent Claim
50 words
An ink set comprising a first ink and a second ink in combination, wherein the first ink is an ink according to claim 1 , and each of the first and second inks has a color selected from the group consisting of yellow, magenta, cyan, black, red, green and blue.
Claim 18
Dependent Claim
23 words
An image recording process, comprising the step of applying an ink according to claim 1 to a recording medium by an ink-jet process.
Claim 19
Dependent Claim
24 words
An image recording apparatus, comprising: an ink container containing an ink according to claim 1 ; and an ink-jet head for ejecting the ink.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-09-14 | 2008-03-15 | 2008-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-09-14 | 2012-03-15 | 2012-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-09-14 | 2016-03-15 | 2016-09-14 | $7700.00 | Window Closed / Lapsed |