US4581071A
Expired / Lapsed
US
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Aqueous ink for ink jet printing
Assignee: Ricoh Co Ltd
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Filing: 1985-03-06
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Granted: 1986-04-08
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Expires: 2005-03-06
Abstract
Abstract An aqueous ink is disclosed, which comprises a first magenta dye having the formula (I), a second magenta dye having the formula (II), a water-soluble organic solvent having a boiling point of 100° C. or higher, water and a preservative and anti-mold agent: ##STR1## wherein R 1 and R 2 each represent ##STR2## (in which R 5 , R 6 , R 7 and R 8 each represent a lower alkyl group, an amino group, a sulfonic acid group in the form of an alkali metal salt, or a carboxyl group in the form of an alkali metal salt); R 3 and R 4 each represent a lower alkyl group, an amino group, a sulfonic acid group in the form of an alkali metal salt, or a carboxyl group in the form of an alkali metal salt; and k, l, m and n each represent an integer of 0, 1 or 2.
Inventors
- 👤 Eiichi Akutsu
- 👤 Kakuji Murakami
- 👤 Tamotsu Aruga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:08
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/17; C09D11/30; C09D11/32; C09D11/328
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
In an aqueous ink comprising a water-soluble organic solvent having a boiling point of 100° C. or higher, water and a preservative and an anti-mold agent, the improvement comprising a first magenta dye having the formula (I) and a second magenta dye having the formula (II): ##STR9## wherein R 1 and R 2 each represent ##STR10## (in which R 5 , R 6 , R 7 and R 8 each represent a lower alkyl group, an amino group, a sulfonic acid group in the form of an alkali metal salt, or a carboxyl group in the form of an alkali metal salt); R 3 and R 4 each represent a lower alkyl group, an amino group, a sulfonic acid group in the form of an alkali metal salt, or a carboxyl group in the form of an alkali metal salt; and k, l, m and n each represent an integer of 0, 1 or 2.
Claim 2
Dependent Claim
155 words
In an aqueous ink comprising a water-soluble organic solvent having a boiling point of 100° C. or higher, water and a preservative and an anti-mold agent, the improvement comprising a first magenta dye having the formula (I) and a second magenta dye having the formula (II): ##STR9## wherein R 1 and R 2 each represent ##STR10## (in which R 5 , R 6 , R 7 and R 8 each represent a lower alkyl group, an amino group, a sulfonic acid group in the form of an alkali metal salt, or a carboxyl group in the form of an alkali metal salt); R 3 and R 4 each represent a lower alkyl group, an amino group, a sulfonic acid group in the form of an alkali metal salt, or a carboxyl group in the form of an alkali metal salt; and k, l, m and n each represent an integer of 0, 1 or 2.
Claim 3
Dependent Claim
30 words
An aqueous ink as claimed in claim 1, wherein the mixing ratio of said first magenta dye to the second magenta dye is in the range of (1:3) to (3:1).
Claim 4
Dependent Claim
40 words
An aqueous ink as claimed in claim 1, wherein the total amount of said first magenta dye and said second magenta dye is in the range of 2.0 wt.% to 5.0 wt.% of the entire weight of said aqueous ink.
Claim 5
Dependent Claim
21 words
An aqueous ink as claimed in claim 1, wherein said second magenta dye is selected from the group consisting of ##STR11##
Claim 6
Dependent Claim
35 words
An aqueous ink as claimed in claim 1, wherein said water-soluble organic solvent is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycols and glycerol and mixtures thereof.
Claim 7
Dependent Claim
38 words
An aqueous ink as claimed in claim 1, wherein said preservative and anti-mold agent is selected from the group consisting of 2,2-dimethyl-6-acetoxy-dioxane-1,3-dehydrosodium acetate, p-hydroxy benzoic acid butyl ester, potassium sorbate, 2-pyridine thiol-1-oxidesodium salt and anionic surface active agents.
References Cited (Backward Citations)
DE3344648A1
Cited
DE3401982A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |