US4163675A
Expired / Lapsed
US
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Aqueous ink composition for writing instruments
Assignee: Pilot Ink Co Ltd
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Filing: 1978-06-30
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Granted: 1979-08-07
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Expires: 1998-06-30
Abstract
Abstract An aqueous ink composition, suitable for use in writing instruments including an ink passage made of a plastic material, consisting essentially of water, a water-soluble dye and a naphthalene derivative as essential ingredients and a glycol or a polyglycol as a moisture-retaining agent, a very small amount of a surface active agent as a penetrant, an anti-mold agent and other additives as optional ingredients. The naphthalene derivative imparts affinity for the plastic material.
Inventors
- 👤 Katsumi Hirano
- 👤 Takeshi Teranishi
- 👤 Kunio Kosaki
- 👤 Kazuhiko Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:07
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; C09D11/03; C09D11/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
An aqueous ink composition for writing instruments consisting essentially of about 1 to about 15% by weight of a water-soluble dye, about 75 to about 99% by weight of an aqueous solvent of which at least about 50% by weight is water, and about 0.1 to about 10% by weight of a naphthalene derivative of the general formula (I): ##STR7## wherein S represents --SO 3 M or --COOM in which M represents H, an alkali metal atom or NH 4 ; m is 1, 2, 3, or 4; and A, B and C, which may be the same or different, each represents --H, --OR 1 , ##STR8## --NO, --NO 2 or --N.tbd.N + in which R 1 and R 2 , which may be the same or different, each represents --H, --C n H 2n+1 , ##STR9## in which R 3 represents --H, --C n H 2n+1 , --NO 2 , --NH 2 , --OH or --COOH, and n is a number of 1 to 9.
Claim 2
Dependent Claim
166 words
An aqueous ink composition for writing instruments consisting essentially of about 1 to about 15% by weight of a water-soluble dye, about 75 to about 99% by weight of an aqueous solvent of which at least about 50% by weight is water, and about 0.1 to about 10% by weight of a naphthalene derivative of the general formula (I): ##STR7## wherein S represents --SO 3 M or --COOM in which M represents H, an alkali metal atom or NH 4 ; m is 1, 2, 3, or 4; and A, B and C, which may be the same or different, each represents --H, --OR 1 , ##STR8## --NO, --NO 2 or --N.tbd.N + in which R 1 and R 2 , which may be the same or different, each represents --H, --C n H 2n+1 , ##STR9## in which R 3 represents --H, --C n H 2n+1 , --NO 2 , --NH 2 , --OH or --COOH, and n is a number of 1 to 9.
Claim 3
Dependent Claim
109 words
The aqueous ink composition of claim 1, wherein the naphthalene derivative is a compound of the general formula (II): ##STR10## wherein S represents --SO 3 M' or --COOM' in which M' represents H, Na or K; m' is 1 or 2; and D and E, which may be the same or different, each represents --H, --OH or ##STR11## in which R 4 and R 5 , which may be the same or different, each represents --H, --C n H 2n+1 , --COC n H 2n+1 , ##STR12## and n is a number of 1 to 9; and with the proviso that D and E both are not --H simultaneously.
Claim 4
Dependent Claim
48 words
The aqueous ink composition of claim 2, wherein said naphthalene derivative is 5-amino-1-naphthalene sulfonic acid 8-N-phenylamino-1-naphthalenesulfonic acid 5-amino-2-naphthalenesulfonic acid 6-amino-2-naphthalenesulfonic acid 3-amino-2,7-naphthalenedisulfonic acid 6,8-N,N'-Di(phenylamino)-1-naphthalenesulfonic acid 8-hydroxy-1,6-naphthalenedisulfonic acid 4,5-dihydroxy-2,7-naphthalenedisulfonic acid 7-amino-4-hydroxy-2-naphthalenesulfonic acid 7-N-acetylamino-4-hydroxy-2-naphthalenesulfonic acid 7-N-methylamino-4-hydroxy-2-naphthalenesulfonic acid 5-amino-1-hydroxy-2-naphthalenesulfonic acid 6-amino-4-hydroxy-2-naphthalenesulfonic acid 6-N-benzoylamino-4-hydroxy-2-naphthalenesulfonic acid 6-N-(p-carboxyphenyl)amino-4-hydroxy-2-naphthalenesulfonic acid 4-amino-5-hydroxy-1,7-naphthalenedisulfonic acid or 4-N-benzoylamino-5-hydroxy-1,7-naphthalenedisulfonic acid.
Claim 5
Dependent Claim
33 words
The aqueous ink composition of claim 1, wherein the amount of the water-soluble dye is 3 to 10% by weight and the amount of the naphthalene derivative is 0.3 to 7% by weight.
Claim 6
Dependent Claim
19 words
The ink composition of claim 4, wherein the amount of the naphthalene derivative is 0.5 to 3% by weight.
Claim 7
Dependent Claim
26 words
The aqueous ink composition of claim 1, wherein said aqueous ink composition additionally contains a basic substance acting as a dissolving aid for the naphthalene derivative.
Claim 8
Dependent Claim
24 words
The aqueous ink composition of claim 1, additionally containing at least one of a moisture-retaining agent, a surface active agent and an anti-mold agent.
Claim 9
Dependent Claim
14 words
The aqueous ink composition of claim 7, additionally containing at least one ink thickener.
References Cited (Backward Citations)
USRE28605E
Cited
US3519443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |