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US5972082A
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Aqueous ink composition and ink-jet printing method using the same
Assignee: Ricoh Co Ltd
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Filing: 1997-04-29
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Granted: 1999-10-26
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Expires: 2017-04-29
Abstract
Abstract An aqueous ink composition contains a colorant and a humectant, and has a surface tension γ of less than 50 mN/m when measured by a maximum bubble pressure method at 25° C., with a bubble frequency ν of the aqueous ink composition being set at less than 1 Hz, and a surface tension γ of more than 40 mN/m when measured by the maximum bubble pressure method at 25° C., with the bubble frequency ν of the aqueous ink composition being set at more than 5 Hz. In addition, an ink-jet printing method for forming ink images on an image-receiving medium has the step of ejecting the above-mentioned aqueous ink composition in the form of droplets according to the recording signals at a recording frequency of 8 kHz or more.
Inventors
- 👤 Masayuki Koyano
- 👤 Ikuko Yamada
- 👤 Akio Kojima
- 👤 Kiyofumi Nagai
- 👤 Masato Igarashi
- 👤 Akiko Konishi
- 👤 Hiroyuki Mochizuki
- 👤 Takanori Tsuyuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:50
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/38
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
An aqueous ink composition comprising a colorant, a humectant, surfactant A having a surface tension γA (mN/m) of less than 50 mN/m when a 0.1 wt % aqueous solution of said surfactant A is measured by a maximum bubble pressure method at 25° C. and the bubble frequency νA (Hz) is set at less than 1 Hz, and surfactant B having a surface tension γB (mN/m) of more than 40 mN/m when a 0.1 wt % aqueous solution of said surfactant B is measured by a maximum bubble pressure method at 25° C., and the bubble frequency νB (Hz) is set at less than 1 Hz, wherein said aqueous ink composition has a surface tension γ of less than 50 mN/m when measured by a maximum bubble pressure method at 25° C. with a bubble frequency ν of said aqueous ink composition being set at less than 1 Hz, and a surface tension γ of more than 40 mN/m when measured by said maximum bubble pressure method at 25° C., with said bubble frequency ν of said aqueous ink composition being set at more than 5 Hz.
Claim 2
Dependent Claim
187 words
An aqueous ink composition comprising a colorant, a humectant, surfactant A having a surface tension γA (mN/m) of less than 50 mN/m when a 0.1 wt % aqueous solution of said surfactant A is measured by a maximum bubble pressure method at 25° C. and the bubble frequency νA (Hz) is set at less than 1 Hz, and surfactant B having a surface tension γB (mN/m) of more than 40 mN/m when a 0.1 wt % aqueous solution of said surfactant B is measured by a maximum bubble pressure method at 25° C., and the bubble frequency νB (Hz) is set at less than 1 Hz, wherein said aqueous ink composition has a surface tension γ of less than 50 mN/m when measured by a maximum bubble pressure method at 25° C. with a bubble frequency ν of said aqueous ink composition being set at less than 1 Hz, and a surface tension γ of more than 40 mN/m when measured by said maximum bubble pressure method at 25° C., with said bubble frequency ν of said aqueous ink composition being set at more than 5 Hz.
Claim 3
Dependent Claim
133 words
The aqueous ink composition as claimed in claim 1, wherein said surfactant A is selected from the group consisting of a polyoxyethylene alkyl ether acetate of formula (I): R.sup.1 --O--(CH.sub.2 CH.sub.2 O).sub.m --CH.sub.2 COOM (I) wherein R 1 is an alkyl group having 6 to 14 carbon atoms, which may be branched; m is an integer of 3 to 12, and M is a cation selected from the group consisting of alkali metal ion, quaternary ammonium cation, quaternary phosphonium cation and alkanol amine cation; and a dialkyl sulfosuccinate of formula (II): ##STR10## wherein R 2 is an alkyl group having 5 to 7 carbon atoms, which may be branched, and M is a cation selected from the group consisting of alkali metal ion, quaternary ammonium cation, quaternary phosphonium cation and alkanol amine cation.
Claim 4
Dependent Claim
32 words
The aqueous ink composition as claimed in claim 2, wherein said surfactant A is in an amount of 0.05 to 1.0 wt. % of the total weight of said aqueous ink composition.
Claim 5
Dependent Claim
17 words
The aqueous ink composition as claimed in claim 1, wherein said surfactant B is a nonionic surfactant.
Claim 6
Dependent Claim
32 words
The aqueous ink composition as claimed in claim 4, wherein said surfactant B is in an amount of 0.05 to 5.0 wt. % of the total weight of said aqueous ink composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2002-10-25 | 2003-04-26 | 2003-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-25 | 2007-04-26 | 2007-10-26 | $3760.00 | Window Closed / Lapsed |
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