EP0997288A2
Expired / Lapsed
EP
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Ink set, ink-jet recording process, ink-jet recording apparatus, and method for alleviating formation of solid within common recovery-system unit
Assignee: Canon Inc
•
Filing: 1999-10-26
•
Granted: —
•
Expires: 2019-10-26
Abstract
Abstract Disclosed herein is an ink set comprising a black ink and a color ink and being suitable for an ink-jet recording apparatus comprising a common recovering means for a black ink-ejecting means and a color ink-ejecting means, wherein the black ink comprises particles of self-dispersing carbon black having at least one anionic hydrophilic group at the surface thereof in an aqueous medium, and the pH of the color ink is higher than the pH of the black ink. <IMAGE>
Inventors
- 👤 Hisashi Teraoka
- 👤 Shinya Mishina
- 👤 Mikio Sanada
- 👤 Koichi Osumi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 00:25
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/40; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/165; B41J2/16505; B41J2/16508; B41J2/21; B41J2/2107
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
75 words
An ink set comprising a black ink and a
color ink and being suitable for an ink-jet recording
apparatus comprising a common recovering means for a
black ink-ejecting means and a color ink-ejecting
means, wherein the black ink comprises particles of self-dispersing
carbon black having at least one anionic
hydrophilic group at the surface thereof in an aqueous
medium, and the pH of the color inks is higher than the pH
of the black ink.
Claim 2
Dependent Claim
83 words
The ink set according to Claim 1, wherein
the black ink comprises particles of self-dispersing
carbon black having at least one anionic hydrophilic
group at the surface thereof, and at least one salt
selected from the group consisting of (M1) 2 SO 4 ,
CH 3 COO(M1), Ph-COO(M1), (M1)NO 3 , (M1)Cl, (M1)Br, (M1)I,
(M1) 2 SO 3 and (M1) 2 CO 3 , wherein M1 is alkali metal,
ammonium or organic ammonium, and Ph is a phenyl group,
in an aqueous medium.
Claim 3
Dependent Claim
31 words
The ink set according to Claim 2, wherein
the salt is contained in a range of from 0.05 to 10 %
by weight based on the total weight of the ink.
Claim 4
Dependent Claim
31 words
The ink set according to Claim 3, wherein
the salt is contained in a range of from 0.05 to 5 % by
weight based on the total weight of the ink.
Claim 5
Dependent Claim
46 words
The ink set according to any one of Claims 1
to 4, wherein the hydrophilic group is selected from
the group consisting of -COOM, -SO 3 M, -PO 3 HM and -PO 3 M 2 ,
wherein M is hydrogen, alkali metal, ammonium or
organic ammonium.
Claim 6
Dependent Claim
27 words
The ink set according to any one of Claims 1
to 5, wherein the hydrophilic group is bonded directly
to the surfaces of the carbon black particles.
Claim 7
Dependent Claim
30 words
The ink set according to any one of Claims 1
to 5, wherein the hydrophilic group is bonded to the
surfaces of the carbon black particles through an
atomic group.
Claim 8
Dependent Claim
39 words
The ink set according to Claim 7, wherein
the atomic group is selected from the group consisting
of alkylene groups having 1 to 12 carbon atoms, a
substituted or unsubstituted phenylene group, and a
substituted or unsubstituted naphthylene group.
Claim 9
Dependent Claim
22 words
The ink set according to any one of Claims 1
to 5, wherein the hydrophilic group has ammonium as a
counter ion.
Claim 10
Dependent Claim
27 words
The ink set according to any one of Claims
1 to 9, wherein the color ink comprises an acid dye or
direct dye as a coloring material.
Claim 11
Dependent Claim
23 words
The ink set according to any one of Claims
1 to 9, wherein the color ink comprises a pigment as a
coloring material.
Claim 12
Dependent Claim
29 words
The ink set according to any one of Claims
1 to 11, wherein the color ink comprises at least one
compound of a hydroxide and an alkaline metal salt.
Claim 13
Dependent Claim
115 words
An ink-jet recording process comprising the
steps of: (i) applying energy to at least one of a black
ink and a color ink; (ii) ejecting the ink to which the energy is
applied and attaching the ejected ink to a recording
medium, the steps (i) and (ii) being conducted with an
ink-jet recording apparatus provided with a common
recovery means for a black ink-ejecting means and a
color ink-ejecting means, wherein the black ink comprises particles of
self-dispersing carbon black having at least one
anionic hydrophilic group at the surface thereof in an
aqueous medium and having a prescribed pH, and the
color ink has a pH higher than the pH of the black ink.
Claim 14
Dependent Claim
14 words
The ink-jet recording process according to
Claim 13, wherein the energy is thermal energy.
Claim 15
Dependent Claim
14 words
The ink-jet recording process according to
Claim 13, wherein the energy is mechanical energy.
Claim 16
Dependent Claim
106 words
A recording unit comprising at least two
ink-containing portions containing a black ink and a
color ink respectively, and an ink-jet head for
ejecting the black ink and the color ink respectively,
the recording unit being for an ink-jet recording
apparatus provided with a common recovery means for a
black ink-ejecting orifice and a color ink-ejecting
orifice of the ink-jet head, wherein the black ink comprises particles of
self-dispersing carbon black having at least one
anionic hydrophilic group at the surface thereof in an
aqueous medium and having a prescribed pH, and the
color ink has a pH higher than the pH of the black ink.
Claim 17
Dependent Claim
107 words
An ink cartridge suitable for use in an
ink-jet recording apparatus provided with an ink-jet
head ejecting a black ink and a color ink, and a common
recovering means for a black ink-ejecting orifice of
the ink-jet head and a color ink-ejecting orifice of
the ink-jet head comprising at least two ink-containing
portions containing the black ink and the color ink,
respectively, wherein the black ink comprises particles
of self-dispersing carbon black having at least one
anionic hydrophilic group at the surface thereof in an
aqueous medium and has a prescribed pH, and the color
ink has a pH higher than the pH of the black ink.
Claim 18
Dependent Claim
113 words
An ink-jet recording apparatus comprising a
recording unit which has at least two ink-containing
portions and a head portion for ejecting the inks fed
from the ink-containing portions in the form of ink
droplets by the action of thermal energy, and further a
cap for capping ejection opening faces of the head
portions, a pump communicating with the interior of the
cap and being capable of sucking an ink contained in
the cap, and a waste ink-absorbing member for absorbing
and preserving the waste ink discharged from the pump,
wherein the ink-containing portions respectively
contains at least two inks making up the ink set
according to any one of Claims 1 to 12.
Claim 19
Dependent Claim
47 words
The ink-jet recording apparatus according
to Claim 18, wherein the cap communicating with the
pump capable of sucking is so constructed that the
black ink and at least one color inks of at least two
inks making up the ink set are sucked at the same time.
Claim 20
Dependent Claim
118 words
An ink-jet recording apparatus comprising a
recording unit which has an ink cartridge equipped with
at least two ink-containing portions, and a head
portion for ejecting the inks fed from the ink-containing
portions in the form of ink droplets by the
action of thermal energy, and further a cap for capping
ejection opening faces of the recording head, a pump
communicating with the interior of the cap and being
capable of sucking an ink contained in the cap, and a
waste ink-absorbing member for absorbing and preserving
the waste ink discharged from the pump, wherein the
ink-containing portions separately contain at least two
inks making up the ink set according to any one of
Claims 1 to 12.
Claim 21
Dependent Claim
47 words
The ink-jet recording apparatus according
to Claim 20, wherein the cap communicating with the
pump capable of sucking is so constructed that the
black ink and at least one color inks of at least two
inks making up the ink set are sucked at the same time.
Claim 22
Dependent Claim
29 words
The ink-jet recording apparatus according
to Claim 20 or 21, which comprises ink feed portions
for separately feeding the inks contained in the ink-containing
portions of the ink cartridge.
Claim 23
Dependent Claim
129 words
An ink-jet recording apparatus comprising a
recording unit which has at least two ink-containing
portions respectively containing at least two inks of
different colors and a head portion for ejecting the
inks fed from the ink-containing portions, a cap for
capping together ejection opening faces for said at
least two inks provided in the head portion, a pump for
sucking the inks in the head portion through the cap,
and an ink-absorbing member for preserving said at
least two inks sucked by the pump, wherein said two
inks of different colors are a black ink comprising
self-dispersing carbon black having at least one
anionic hydrophilic group at the surface thereof in an
aqueous medium, and a color ink having a pH higher than
the pH of the black ink.
Claim 24
Dependent Claim
138 words
An ink-jet recording apparatus comprising a
plurality of ink cartridges separately containing at
least two inks of different colors, a head portion, in
which the ink cartridges are detachably installed and
from which the inks contained in ink-containing
portions of the respective ink cartridges are ejected,
a cap for capping together ejection opening faces for
said at least two inks provided in the head portion, a
pump for sucking the inks in the head portion through
the cap, and an ink-absorbing member for preserving
said at least two inks sucked by the pump, wherein said
two inks of different colors are a black ink comprising
self-dispersing carbon black having at least one
anionic hydrophilic group at the surface thereof in an
aqueous medium, and a color ink having a pH higher than
the pH of the black ink.
Claim 25
Dependent Claim
82 words
The ink-jet recording apparatus according
to Claim 23 or 24, wherein the black ink comprises
particles of self-dispersing carbon black having at
least one anionic hydrophilic group at the surface
thereof, and at least one salt selected from (M1) 2 SO 4 ,
CH 3 COO(M1), Ph-COO(M1), (M1)NO 3 , (M1)Cl, (M1)Br, (M1)I,
(M1) 2 SO 3 and (M1) 2 CO 3 , wherein M1 is alkali metal,
ammonium or organic ammonium, and Ph is a phenyl group,
in an aqueous medium.
Claim 26
Dependent Claim
32 words
The ink-jet recording apparatus according
to Claim 25, wherein the salt is contained in a range
of from 0.05 to 10 % by weight based on the total
weight of the ink.
Claim 27
Dependent Claim
34 words
The ink-jet recording apparatus according
to Claim 25 or 26, wherein the salt is contained in a
range of from 0.05 to 5 % by weight based on the total
weight of the ink.
Claim 28
Dependent Claim
47 words
The ink-jet recording apparatus according
to any one of Claims 23 to 27, wherein the hydrophilic
group is selected from the group consisting of
-COOM, -SO 3 M, -PO 3 HM and -PO 3 M 2 , wherein M is hydrogen,
alkali metal, ammonium or organic ammonium.
Claim 29
Dependent Claim
29 words
The ink-jet recording apparatus according
to any one of Claims 23, 24 and 28, wherein the
hydrophilic group is bound directly to the surfaces of
the carbon black particles.
Claim 30
Dependent Claim
32 words
The ink-jet recording apparatus according
to any one of Claims 23, 24 and 28, wherein the
hydrophilic group is bound to the surfaces of the
carbon black particles through an atomic group.
Claim 31
Dependent Claim
40 words
The ink-jet recording apparatus according
to Claim 30, wherein the atomic group is selected from
the group consisting of alkylene groups having 1 to 12
carbon atoms, a substituted or unsubstituted phenylene
group, and a substituted or unsubstituted naphthylene
group.
Claim 32
Dependent Claim
23 words
The ink-jet recording apparatus according
to any one of Claims 28 to 30, wherein the hydrophilic
group has ammonium as a counter ion.
Claim 33
Dependent Claim
25 words
The ink-jet recording apparatus according
to Claim 23 or 24, wherein the color ink comprises an
acid dye or direct dye as a coloring material.
Claim 34
Dependent Claim
21 words
The ink-jet recording apparatus according
to Claim 23 or 24, wherein the color ink comprises a
pigment as a coloring material.
Claim 35
Dependent Claim
32 words
The ink-jet recording apparatus according
to any one of Claims 23, 24, 33 and 34, wherein the
color ink comprises at least one compound of a
hydroxide and an alkaline metal salt.
Claim 36
Independent Claim
70 words
A method for alleviating the formation of
solids within a common recovery-system unit of an ink-jet
recording apparatus which is provided with a black
ink comprising self-dispersing carbon black and a color
ink and has a recovery-system unit for common use for
the black ink and the color ink, which comprises using
a color ink having a pH higher than the pH of the black
ink as the color ink.
References Cited (Backward Citations)
No citation records indexed.
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