EP1146090A2
Expired / Lapsed
EP
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Process for the preparation of pigment dispersion, pigment dispersion obtained by the same, ink jet recording ink comprising the same, and recording method and recording material using the same
Assignee: Seiko Epson Corp
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Filing: 2001-04-10
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Granted: —
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Expires: 2021-04-10
Abstract
Abstract Provided is a process for the preparation of a pigment dispersion which comprises a pigment surface treatment step of introducing at least one hydrophilic dispersibility-providing group onto the surface of a pigment directly and/or with the interposition of a polyvalent group, and a dispersion step of dispersing a surface-treated pigment obtained at the surface treatment step in an aqueous medium, characterized in that the dispersion step involves the dispersion of the surface-treated pigment in admixture with a wetting agent and water and a resin for providing dispersibility and/or fixability is added during and/or after the dispersion step.
Inventors
- 👤 Hitoshi Ota
- 👤 Hidehiko Komatsu
- 👤 Kazuhiko Hara
- 👤 Masahiro Yatake
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 00:23
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0017; C09B67/0019; C09B67/0002; C09B67/0022; C09B67/0023; C09B67/0071; C09B67/0084; C09B67/0085; C09B67/0086; C09B67/0089; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/322; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/64
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
93 words
A process for the preparation of a pigment dispersion
which comprises a pigment surface treatment step of introducing
at least one hydrophilic dispersibility-providing group onto
the surface of a pigment directly and/or with the interposition
of a polyvalent group, and a dispersion step of dispersing a
surface-treated pigment obtained at said surface treatment
step in an aqueous medium, wherein said dispersion step involves
the dispersion of said surface-treated pigment in admixture
with a wetting agent and water and a resin for providing
dispersibility and/or fixability is added during and/or after
said dispersion step.
Claim 2
Dependent Claim
32 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein the surface tension
at 20°C of the mixture at said dispersion step is not higher
than 40 mN/m.
Claim 3
Dependent Claim
37 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein the pigment
concentration in the mixture at said dispersion step is not
higher than 50% by weight as calculated in terms of weight.
Claim 4
Dependent Claim
44 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein the wetting agent to
be used at said dispersion step comprises one or more materials
selected from the group consisting of acetylene glycols,
acetylene alcohols, glycol ethers and alkylene glycols.
Claim 5
Dependent Claim
42 words
The process for the preparation of a pigment
dispersion according to Claim 4, wherein the wetting agent
comprises acetylene glycols and/or acetylene alcohols in an
amount of from not lower than 1/50 of to twice the amount of
said pigment by weight.
Claim 6
Dependent Claim
86 words
The process for the preparation of a pigment
dispersion according to Claim 4 or 5, wherein said acetylene
glycols and acetylene alcohols are compounds represented by
the following general formulae (I) and (II), respectively: wherein R 1 , R 2 , R 3 and R 4 each independently represent an alkyl
group; and the sum of m 1 and n 1 is from 0 to 30. wherein R 5 and R 6 each independently represent an alkyl group;
and m 2 is from 0 to 30.
Claim 7
Dependent Claim
124 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said hydrophilic
dispersibility-providing group to be introduced onto the
surface of a pigment at said surface treatment step comprises
at least one selected from the group consisting of functional
groups represented by the following general formulae and salts
thereof: -OM, -COOM, -CO-, -SO 3 M, -SO 2 M, -SO 2 NH 2 , -RSO 2 M, -PO 3 HM,
-PO 3 M 2 , -SO 2 NHCOR, -NH 3 , -NR 3 in which M represents a hydrogen
atom, alkaline metal, ammonium or organic ammonium; and R
represents a C 1-12 alkyl group, a phenyl group which may have
a substituent or a naphthyl group which may have a substituent.
Claim 8
Dependent Claim
37 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said hydrophilic
dispersibility-providing group to be introduced onto the
surface of a pigment at said surface treatment step is a
sulfur-containing dispersibility-providing group.
Claim 9
Dependent Claim
39 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein the amount of said
resin to be added is from not lower than 1/10 of to three times
the amount of said pigment by weight.
Claim 10
Dependent Claim
166 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said resin comprises
an alkali-soluble resin and/or a vinyl polymer obtained by the
copolymerization of (a) one or more selected from the group
consisting of silicon macromer represented by the following
general formula (III) and acrylamide or methacrylamide-based
monomer (excluding said monomer having salt-producing groups) ,
(b) a polymerizable unsaturated monomer having a salt-producing
group and (c) a monomer copolymerizable with these monomers
in the presence of a radical polymerization initiator: X(Y) v Si(R) 3-w (Z) w wherein X represents a polymerizable unsaturated group; Y
represents a divalent connecting group; R represents a hydrogen
atom, a lower alkyl group, an aryl group or an alkoxy group,
with the proviso that a plurality of R's may be the same or
different; Z represents a monovalent siloxane polymer moiety
having a number-average molecular weight of at least about 500;
v represents 0 or 1; and w represents an integer of from 1 to
3.
Claim 11
Dependent Claim
26 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said resin exhibits
a glass transition temperature of not lower than 50°C.
Claim 12
Dependent Claim
26 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said resin has a
weight-average molecular weight of from 1,600 to 50,000.
Claim 13
Dependent Claim
25 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said resin exhibits
an acid value of from 10 to 250.
Claim 14
Dependent Claim
25 words
The process for the preparation of a pigment
dispersion according to Claim 10, wherein among said resins,
the alkali-soluble resin is a styrene-acrylic acid copolymer.
Claim 15
Dependent Claim
36 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein the liquid component
of the pigment dispersion thus prepared comprises polyvalent
metal ions in total amount of not higher than 600 ppm.
Claim 16
Dependent Claim
45 words
The process for the preparation of a pigment
dispersion according to Claim 15, wherein the amount of Si,
Ca, Mg, Fe, Cr and Ni ions to be incorporated in the liquid
component of the pigment dispersion thus prepared are each not
higher than 100 ppm.
Claim 17
Dependent Claim
36 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said pigment for
introducing a hydrophilic dispersibility-providing group at
said surface treatment step comprises a carbon black pigment
and/or an organic pigment.
Claim 18
Dependent Claim
60 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said pigment for
introducing a hydrophilic dispersibility-providing group at
said surface treatment step comprises one or more pigments
selected from the group consisting of C.I. pigment red, C.I.
pigment yellow, C.I. pigment violet, C.I. pigment blue, C.I.
pigment orange, C.I. pigment green, and C.I. pigment brown.
Claim 19
Dependent Claim
56 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said pigment for
introducing a hydrophilic dispersibility-providing group at
said surface treatment step comprises one or more pigments
selected from the group consisting of phthalocyanine pigment,
quinacridone pigment, condensed azo pigment, isoindolinone
pigment, quinophthalone pigment, anthraquinone pigment,
benzimidazolone pigment, and perylene pigment.
Claim 20
Dependent Claim
40 words
The process for the preparation of a pigment
dispersion according to Claim 1, wherein said surface treatment
step involves the introduction of a polymer material onto the
surface of a pigment directly and/or with the interposition
of a polyvalent group.
Claim 21
Dependent Claim
23 words
A pigment dispersion prepared by the process for
the preparation of a pigment dispersion described in any one
of Claims 1 to 20.
Claim 22
Dependent Claim
15 words
An ink jet recording ink at least comprising the
pigment dispersion described in Claim 21.
Claim 23
Dependent Claim
29 words
An ink jet recording method which comprises
energizing the ink described in Claim 22 so that it is ejected
from a recording head and attached to a recording medium.
Claim 24
Dependent Claim
16 words
The ink jet recording method according to Claim 23,
wherein said energy is a dynamic energy.
Claim 25
Dependent Claim
16 words
The ink jet recording method according to Claim 23,
wherein said energy is a heat energy.
Claim 26
Dependent Claim
16 words
A recorded material obtained by the method
described in any one of Claims 23 to 25.
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