EP1577353A1
Expired / Lapsed
EP
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Water base ink, method of ink jet recording, ink cartridge, recording unit, nk jet recording apparatus and method of image formation
Assignee: Canon Inc
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Filing: 2003-12-26
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Granted: —
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Expires: 2023-12-26
Abstract
Abstract A water-based ink of the present invention comprises water, a plurality of different water-soluble organic solvents, and a water-insoluble coloring material, wherein the above water-soluble organic solvents consist of a good solvent to the above water-insoluble coloring material and a poor solvent to the above water-insoluble coloring material, and the total amount (% by mass) of the good solvents in the ink is represented by A and the total amount (% by mass) of the poor solvent in the ink is represented by B, the ratio of A to B ranges from 10:5 to 10:30 both inclusive, and when the respective Ka values of the above water-soluble organic solvents are determined by the Bristow method and compared with each other, a water-soluble organic solvent having the greatest Ka value is the poor solvent. The pigment ink has a sufficiently large area factor even with a small amount of ink and provides an image of high OD.
Inventors
- 👤 Mikio C/O Canon Kabushiki Kaisha Sanada
- 👤 Katsuhiko C/O Canon Kabushiki Kaisha Takahashi
- 👤 Masashi c/o Canon Kabushiki Kaisha Ogasawara
- 👤 Tomonari c/o Canon Kabushiki Kaisha WATANABE
- 👤 Yui c/o Canon Kabushiki Kaisha TOKUDA
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 13:07
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/21; B41J2/2107; B41J2/211; B41J2/17; B41J2/175; B41M; B41M5/00; C09D11/32; B41J2/135; B41J2/165; B41J2/16517
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
120 words
A water-based ink comprising water, a
plurality of water-soluble organic solvents, and a
water-insoluble coloring material, wherein said water-soluble organic solvents
consist of a good solvent to said water-insoluble
coloring material and a poor solvent to said water-insoluble
coloring material, and the total amount (%
by mass) of the good solvent in the ink represented
by A and the total amount (% by mass) of the poor
solvent in the ink represented by B are in a ratio of
from 10:5 to 10:30 both inclusive, and when the respective Ka values of said water-soluble
organic solvents are determined by the
Bristow method and compared with each other, the
water-soluble organic solvent having the greatest Ka
value is a poor solvent.
Claim 2
Dependent Claim
282 words
A water-based ink comprising water, a
plurality of water-soluble organic solvents, and a
water-insoluble coloring material, wherein said water-soluble organic solvents
consist of a good solvent to said water-insoluble
coloring material and a poor solvent to said water-insoluble
coloring material, and when Ka values of
said water-soluble organic solvents are determined by
the Bristow method and are compared with each other,
a water-soluble organic solvent having the greatest
Ka value is the poor solvent, and wherein, with regard to the state of said
water-based ink attaching to a plain paper, when a
needle with a needle diameter of 28 G (inner
diameter: 0.18 mm, and outer diameter: 0.36 mm) is
used, the needle point is located at a height of 4 mm
from the surface of the plain paper, an ink is
dropped off the needle point at the height, and the
ink is then fixed on the surface, if the measurement
value of a diameter of an ink dot obtained
immediately after the ink landed on the plain paper
is represented by dI, the measurement value of the
largest diameter of the spread of the ink after the
ink fixed on the plain paper is represented by dS,
and the measurement value of the largest diameter of
the spread of the water-insoluble coloring material
in the ink after the ink fixed on the plain paper is
represented by dC, a relationship represented by the
following Formula 1 is established among said
measurement values, and the penetration depth of the
water-insoluble coloring material into a plain paper
is less than 30 µm after the ink is printed and fixed
on the plain paper by ink jet recording: dC < dI < dS
Claim 3
Dependent Claim
57 words
The water-based ink according to claim 2, wherein when the total amount (% by mass) of the good
solvent in said ink is represented by A and the total
amount (% by mass) of the poor solvent in said ink is
represented by B, the ratio of A to B ranges from
10:5 to 10:30 both inclusive.
Claim 4
Dependent Claim
43 words
The water-based ink according to any one of
claims 1 to 3, wherein said water-insoluble coloring
material is any one selected from the group
consisting of a resin dispersed pigment using a resin
as a dispersant, a micro-encapsulated pigment, and a
self-dispersing pigment.
Claim 5
Dependent Claim
56 words
The water-based ink according to any one of
claims 1 to 3, wherein said water-insoluble coloring
material is a self-dispersing organic pigment or
carbon black and has at least one hydrophilic group
on the surface of particles thereof, wherein said
hydrophilic group is boded to the surface of the
particles, directly or via another atom group.
Claim 6
Dependent Claim
50 words
The water-based ink according to claim 5, wherein said hydrophilic group is any one selected
from the group consisting of -COOM1, -SO 3 M1, and -
PO 3 H(M1) 2 wherein M1 represents any one selected from
the group consisting of hydrogen, an alkaline metal,
ammonium, and an organic ammonium.
Claim 7
Dependent Claim
45 words
The water-based ink according to claim 5 or
6, wherein said another atom group is any one
selected from the group consisting of an alkylene
group containing 1 to 12 carbon atoms, a substituted
or unsubstituted phenylene group, and a substituted
or unsubstituted naphthylene group.
Claim 8
Dependent Claim
89 words
The water-based ink according to any one of
claims 1 to 3, wherein said water-insoluble coloring
material is a modified organic pigment or carbon
black in which an organic group is chemically bonded
to the surface of the particles of the coloring
material, wherein said organic group comprises a
reaction product between a functional group that is
bonded to the surface of the particles of the organic
pigment or carbon black, directly or chemically via
another atom group, and a copolymer of an ionic
monomer with a hydrophobic monomer.
Claim 9
Dependent Claim
31 words
The water-based ink according to any one of
claims 1 to 9, wherein a Ka value determined by the
Bristow method is less than 1.5 (ml/m 2 /msec 1/2 ) .
Claim 10
Dependent Claim
31 words
The water-based ink according to any one of
claims 1, 2 and 9, wherein a Ka value determined by
the Bristow method is 0.2 (ml/m 2 /msec 1/2 ) or more.
Claim 11
Dependent Claim
32 words
The water-based ink according to any one of
claims 1 to 10, wherein said water-insoluble coloring
material is between 0.1% and 15% by mass based on the
total amount of the ink.
Claim 12
Dependent Claim
32 words
The water-based ink according to any one of
claims 1 to 11, wherein said water-insoluble coloring
material is between 1% and 10% by mass based on the
total amount of the ink.
Claim 13
Dependent Claim
19 words
The water-based ink according to any one of
claims 1 to 12, which is used in ink jet printing.
Claim 14
Dependent Claim
25 words
An ink jet recording method, which
comprises at least a step of ejecting the water-based
ink according to claim 13 by the ink jet method.
Claim 15
Dependent Claim
36 words
The ink jet recording method according to
claim 14, wherein said ink jet method is an ink jet
recording method involving giving thermal energy to
the ink to generate air bubbles, so as to eject
droplets.
Claim 16
Dependent Claim
17 words
An ink cartridge, which stores the water-based
ink according to any one of claims 1 to 13.
Claim 17
Dependent Claim
26 words
A recording unit comprising an ink storing
unit for storing the water-based ink according to
claim 13 and an ink jet head for ejecting the ink.
Claim 18
Dependent Claim
28 words
An ink jet recording apparatus comprising
an ink storing unit for storing the water-based ink
according to claim 13 and an ink jet head for
ejecting the ink.
Claim 19
Dependent Claim
96 words
An image forming method by ink jet
recording on a plain paper using a black ink and at
least one water based color ink, wherein the water-based
ink according to claim 13 is used as a black
ink, and when an image consisting of a block image
formed from the black ink that is adjacent to a color
image formed from the color ink is formed, the image
is formed by scanning for attaching the black ink,
and then scanning for attaching the color ink to a
region in which the black image has been formed.
Claim 20
Dependent Claim
40 words
The image forming method according to claim
19, wherein the scanning for attaching the black ink
is carried out, and after leaving at least a space of
a single scanning, the scanning for attaching the
color ink is carried out.
Claim 21
Dependent Claim
47 words
The image forming method according to claim
19, wherein ink is applied using a recording head in
which a line of discharge orifices for ejecting the
black ink and a line of discharge orifices for
ejecting the color inks are located while shifting to
a sub-scanning direction.
Claim 22
Dependent Claim
34 words
The image forming method according to claim
19, wherein ink is applied by the ink jet recording
method involving giving thermal energy to the ink to
generate air bubbles, so as to eject droplets.
Claim 23
Dependent Claim
109 words
A water-based ink comprising water, a
plurality of different water-soluble organic solvents,
and a water-insoluble coloring material, wherein said a plurality of water-soluble
organic solvents consist of good solvents to said
water-insoluble coloring material and poor solvents
to said water-insoluble coloring material, and when
the respective Ka values of said a plurality of
water-soluble organic solvents are determined by the
Bristow method, a water-soluble organic solvent
having the greatest Ka value is the poor solvents,
and the poor solvent permeates a recording medium
before the good solvent does, so that it facilitates
coagulation of said water-insoluble coloring material
in the good solvent on the surface of the recording
medium.
References Cited (Backward Citations)
No citation records indexed.
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