US7005461B2
Expired / Lapsed
US
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Aqueous ink, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus
Assignee: Cabot Corp
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Filing: 2003-02-03
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Granted: 2006-02-28
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Expires: 2023-02-03
Abstract
Abstract The present invention relates to an aqueous ink, particularly an aqueous ink suitable for ink jet recording. The ink is an aqueous ink comprising a modified pigment having organic groups chemically attached to the surface of a particle of the pigment and an aqueous medium which is a dispersant of the pigment, wherein the above-described organic group includes a reaction product of a functional group chemically attached to the surface of the pigment directly or via another atomic group with a copolymer of an ionic monomer and a hydrophobic monomer.
Inventors
- 👤 Mikio Sanada
- 👤 Yoshihisa Takizawa
- 👤 Katsuhiko Takahashi
- 👤 Masashi Ogasawara
- 👤 Yoichi Takada
- 👤 Tomonari Watanabe
- 👤 Yui Tokuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/324; C09D11/322
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
113 words
An aqueous ink comprising a modified pigment having an organic group chemically attached to the surface of the pigment, and an aqueous medium as a dispersant of the pigment, wherein said organic group comprises a reaction product of a functional group chemically attached to the surface of the pigment directly or via another atomic group with a copolymer of an ionic monomer and a hydrophobic monomer, wherein a proportion of the organic group contained in said modified pigment to the total amount of said modified pigment is 5 to 40 wt %; wherein a polydispersity Mw/Mn (Mw: weight average molecular weight, Mn: number average molecular weight) of said copolymer is 3 or less.
Claim 2
Dependent Claim
113 words
An aqueous ink comprising a modified pigment having an organic group chemically attached to the surface of the pigment, and an aqueous medium as a dispersant of the pigment, wherein said organic group comprises a reaction product of a functional group chemically attached to the surface of the pigment directly or via another atomic group with a copolymer of an ionic monomer and a hydrophobic monomer, wherein a proportion of the organic group contained in said modified pigment to the total amount of said modified pigment is 5 to 40 wt %; wherein a polydispersity Mw/Mn (Mw: weight average molecular weight, Mn: number average molecular weight) of said copolymer is 3 or less.
Claim 3
Dependent Claim
52 words
The aqueous ink according to claim 1 , wherein, when a segment including said copolymer which is not chemically attached to the surface of the pigment exists in said ink, a proportion of said segment to the total amount of said segment and said reaction product is less than 50 wt %.
Claim 4
Dependent Claim
31 words
The aqueous ink according to claim 2 , wherein a proportion of said segment to the total amount of said segment and said reaction product is less than 35 wt %.
Claim 5
Dependent Claim
31 words
The aqueous ink according to claim 3 , wherein a proportion of said segment to the total amount of said segment and said reaction product is less than 20 wt %.
Claim 6
Dependent Claim
18 words
The aqueous ink according to claim 1 , wherein said other atomic group is a phenyl (2-sulfoethyl) group.
Claim 7
Dependent Claim
14 words
The aqueous ink according to claim 1 , wherein said pigment is carbon black.
Claim 8
Dependent Claim
32 words
The aqueous ink according to claim 1 , wherein Mw (weight average molecular weight) of said copolymer is 1,000 to 20,000, and acid value or amine value thereof is 100 to 500.
Claim 9
Dependent Claim
28 words
The aqueous ink according to claim 1 , wherein the Ka value of said ink determined by Bristow method is less than 1.5 (ml/m 2 /msec 1/2 ).
Claim 10
Dependent Claim
28 words
The aqueous ink according to claim 8 , wherein the Ka value is 0.2 (ml/m 2 /msec 1/2 ) to less than 1.5 (ml/m 2 /msec 1/2 ).
Claim 11
Dependent Claim
34 words
The aqueous ink according to claim 1 , wherein a proportion of the organic groups contained in said modified pigment to the total amount of said modified pigment is 10 to 25 wt %.
Claim 12
Dependent Claim
29 words
The aqueous ink according to claim 1 , wherein a proportion of said modified pigment to the total amount of said aqueous ink is 0.1 to 15 wt %.
Claim 13
Dependent Claim
29 words
The aqueous ink according to claim 11 , wherein a proportion of said modified pigment to the total amount of said aqueous ink is 1 to 10 wt %.
Claim 14
Dependent Claim
22 words
The aqueous ink according to claim 1 , further comprising a surfactant which has an alkylene oxide chain in a molecule thereof.
Claim 15
Dependent Claim
21 words
The aqueous ink according to claim 13 , wherein said surfactant is a surfactant whose HLB value is 15 or more.
Claim 16
Dependent Claim
99 words
The aqueous ink according to claim 13 , wherein said surfactant is at least one selected from the group consisting of compounds having Formulae (1) to (5) as described below; R—O—(CH 2 CH 2 O) n —H Formula (1) wherein R represents an alkyl group and n represents a positive integer; wherein R represents an alkyl group and n represents a positive integer; wherein R represents a hydrogen atom or an alkyl group, and m and n represent positive integers independently; wherein m and n represent positive integers independently; and wherein a, b, and c represent positive integers independently.
Claim 17
Dependent Claim
40 words
The aqueous ink according to claim 1 , wherein there is no change or substantially no change between the weight loss rate in the thermogravimetric analysis of said modified pigment before and after washing with a solvent for said copolymer.
Claim 18
Dependent Claim
18 words
The aqueous ink according to claim 1 , wherein said aqueous ink is used for ink jet printing.
Claim 19
Dependent Claim
24 words
A method for ink jet recording comprising a step for discharging the aqueous ink according to claim 17 by means of ink jet process.
Claim 20
Dependent Claim
25 words
A recording unit comprising an ink reservoir which contains the aqueous ink according to claim 17 and an ink jet head for discharging said ink.
Claim 21
Dependent Claim
27 words
An ink jet recording apparatus comprising an ink reservoir which contains the aqueous ink according to claim 17 and an ink jet head for discharging said ink.
Claim 22
Dependent Claim
19 words
The aqueous ink according to claim 17 , wherein said copolymer has an acid value of 140 to 200.
Claim 23
Dependent Claim
12 words
An ink cartridge containing the aqueous ink according to claim 1 .
Claim 24
Dependent Claim
19 words
The aqueous ink according to claim 1 , wherein said copolymer has an acid value of 140 to 200.
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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) | 2009-02-27 | 2009-08-29 | 2010-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-02-27 | 2013-08-29 | 2014-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-02-27 | 2017-08-29 | 2018-02-28 | $7700.00 | Window Closed / Lapsed |