EP0851005A2
Expired / Lapsed
EP
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Agglomerated pigment, process for producing the same, aqueous pigment dispersion, and water-based ink composition
Assignee: Seiko Epson Corp
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Filing: 1997-12-19
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Granted: —
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Expires: 2017-12-19
Abstract
Abstract An agglomerated pigment comprises (1) an organic pigment compound, (2) either a sulfonated organic pigment compound obtained by incorporating at least one sulfonic group into the organic pigment compound or a sulfonated organic pigment derivative obtained by incorporating at least one sulfonic group into a derivative of the organic pigment compound, (3) univalent inorganic counter ions bonded to sulfonic groups of component (2), and (4) bivalent or higher inorganic counter ions which are bonded to sulfonic groups of component (2) and each has an at least univalent positive charge, the surface of the agglomerated organic pigment as a whole being positively charged. An aqueous pigment dispersion and a water-based ink composition both having excellent storage stability, an agglomerated pigment for use as a raw material for the dispersion, and a process for producing the pigment are provided.
Inventors
- 👤 Hiroto Nakamura
- 👤 Hidehiko Komatsu
- 👤 Michinari Tsukahara
- 👤 Hideo Yamazaki
- 👤 Minoru c/o Mikuni Color Ltd. Waki
- 👤 Naoki c/o Mikuni Color Ltd. Okamoto
- 👤 Kazumi c/o Mikuni Color Ltd. Adachi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 07:20
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09B; C09B63/00; C09B63/005; C09B67/00; C09B67/0001; C09B67/0004; C09B67/0033; C09B67/0034; C09D11/16; C09D11/17
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
An agglomerated organic pigment which comprises (1) an organic pigment compound, (2) either a sulfonated organic pigment compound
obtained by incorporating at least one sulfo group into the
organic pigment compound or a sulfonated organic pigment
derivative obtained by incorporating at least one sulfonic
group into a derivative of the organic pigment compound, (3) univalent inorganic counter ions bonded to
sulfonic groups of component (2), and (4) bivalent or higher inorganic counter ions which
are bonded to sulfonic groups of component (2) and each has
an at least univalent positive charge, the surface of said agglomerated organic pigment as a whole
being positively charged.
Claim 2
Dependent Claim
28 words
The agglomerated pigment of claim 1, wherein the
organic pigment compound is a quinacridone pigment, a
phthalocyanine pigment, an azo pigment, a quinophthalone
pigment, or an isoindolinone pigment.
Claim 3
Dependent Claim
23 words
The agglomerated pigment of claim 2, wherein the
quinacridone pigment is C.I. Pigment Red 122, 202, or 209 or
C.I. Pigment Violet 19.
Claim 4
Dependent Claim
22 words
The agglomerated pigment of claim 2, wherein the
phthalocyanine pigment is C.I. Pigment Blue 15, 15:1, 15:2,
15:3, 15:4, 15:6, or 16.
Claim 5
Dependent Claim
20 words
The agglomerated pigment of claim 2, wherein the
isoindolinone pigment is C.I. Pigment Yellow 109 or C.I.
Pigment Yellow 110.
Claim 6
Dependent Claim
45 words
The agglomerated pigment of any one of claims 1
to 5, wherein the content of the sulfonated organic pigment
compound or sulfonated organic pigment derivative is at least
10x10 -6 equivalents in terms of the amount of sulfonic groups
per g of the agglomerated pigment.
Claim 7
Dependent Claim
165 words
A process for producing the agglomerated organic
pigment of claim 1 which comprises the step of: (1) bringing an organic pigment compound into contact
with either a sulfonated organic pigment compound obtained by
incorporating at least one sulfonic group into the organic
pigment compound or a sulfonated organic pigment derivative
obtained by incorporating at least one sulfonic group into a
derivative of the organic pigment compound to thereby yield
sulfonated agglomerates of the organic pigment compound; (2) treating the sulfonated agglomerates with a
compound containing a univalent inorganic ion to replace at
least one of the ionic bonds of each of bivalent or higher
inorganic counter ions which have been bonded to the sulfonic
groups with the univalent inorganic ion to thereby convert
the bivalent or higher inorganic counter ions into bivalent
or higher inorganic counter ions having an at least univalent
positive charge, thereby yielding counter-ion-replaced
agglomerates; and (3) washing the counter-ion-replaced agglomerates to
remove the inorganic ions not bonded to the sulfonic groups.
Claim 8
Dependent Claim
42 words
The process of claim 7, wherein the sulfonated
agglomerates are yielded by dissolving the organic pigment
compound and the sulfonated organic pigment compound or
sulfonated organic pigment derivative in a solvent for both
and then removing the solvent from the resultant solution.
Claim 9
Dependent Claim
46 words
The process of claim 7, wherein the sulfonated
agglomerates are yielded by preparing an aqueous suspension
of the organic pigment compound, adding thereto an aqueous
solution of the sulfonated organic pigment compound or
sulfonated organic pigment derivative, and then removing the
suspension medium and the water.
Claim 10
Dependent Claim
23 words
The process of any one of claims 7 to 9, wherein
the compound containing a univalent inorganic ion is an
alkali metal hydroxide.
Claim 11
Dependent Claim
19 words
The process of any one of claims 7 to 10, wherein
the counter-ion-replaced agglomerates are washed with ion-exchanged
water.
Claim 12
Dependent Claim
19 words
A dispersion comprising fine particles obtained
by pulverizing the agglomerated organic pigment of claim 1, a
dispersant, and water.
Claim 13
Dependent Claim
39 words
The dispersion of claim 12, wherein the total
amount by equivalent of all metal ions contained per g of the
dispersion is up to 80 times the neutralization equivalent of
the sulfonic groups contained per g of the dispersion.
Claim 14
Dependent Claim
20 words
A water-based ink composition comprising fine
particles obtained from the agglomerated organic pigment of
claim 1, a dispersant, and water.
References Cited (Backward Citations)
No citation records indexed.
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