US6004388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-aqueous ink for ball point pen, and ball point pen
Assignee: Mitsubishi Pencil Co Ltd
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Filing: 1998-11-19
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Granted: 1999-12-21
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Expires: 2018-11-19
Abstract
Abstract A non-aqueous ink for a ball point pen is disclosed herein which is accompanied by the feature of the non-aqueous ink excellent in the so-called cap-off performance that a writing performance does not deteriorate even when the pen is allowed to stand, with a cap being removed, and the feature of an aqueous ink that a low writing pressure can be used and blobbing does not occur. This ink comprises an organic solvent having a vapor pressure of 0.2 mmHg (20 DEG C.) or less, a colorant and a coagulant and has a non-Newtonian viscosity index of 0.2 to 0.5 and a viscosity of 200 mPa.s (25 DEG C., 50 rpm) or less. Furthermore, the ink is characterized by containing a autolyophobic vehicle in which a contact angle to the surface of a material such as stainless steel or bronze having a high surface free energy is in the range of 5 to 40 DEG .
Inventors
- 👤 Takahiro Osada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:38
CPC Classifications
B; B43; B43K; B43K7/00; C; C09; C09D; C09D11/00; C09D11/16; C09D11/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
A non-aqueous ink for a ball point pen having a non-Newtonian viscosity index of 0.2 to 0.5 and a viscosity of 200 mPa•s (25° C., 50 rpm) or less which comprises 50 to 95% by weight of organic solvent having a vapor pressure of 0.2 mmHg (20° C.) or less based upon 100% weight of total ink, a colorant and a coagulant.
Claim 2
Dependent Claim
62 words
A non-aqueous ink for a ball point pen having a non-Newtonian viscosity index of 0.2 to 0.5 and a viscosity of 200 mPa•s (25° C., 50 rpm) or less which comprises 50 to 95% by weight of organic solvent having a vapor pressure of 0.2 mmHg (20° C.) or less based upon 100% weight of total ink, a colorant and a coagulant.
Claim 3
Dependent Claim
89 words
A non-aqueous ink for a ball point pen having a tip holder, said ink having a non-Newtonian viscosity index of 0.2 to 0.5 and a viscosity of 200 mPa•s (25° C., 50 rpm) or less which comprises (a) an autolyophobic vehicle which comprises an organic solvent having a vapor pressure of 0.2 mmHg (20° C.) or less and a pigment dispersant, (b) a coagulant and (c) a pigment, wherein said vehicle has a contact angle to the surface of said tip holder in the range of 5 to 40°.
Claim 4
Dependent Claim
89 words
A non-aqueous ink for a ball point pen having a tip holder, said ink having a non-Newtonian viscosity index of 0.2 to 0.5 and a viscosity of 200 mPa•s (25° C., 50 rpm) or less which comprises (a) an autolyophobic vehicle which comprises an organic solvent having a vapor pressure of 0.2 mmHg (20° C.) or less and a pigment dispersant, (b) a coagulant and (c) a pigment, wherein said vehicle has a contact angle to the surface of said tip holder in the range of 5 to 40°.
Claim 5
Dependent Claim
85 words
A non-aqueous ink for a ball point pen having a tip holder, said ink having a non-Newtonian viscosity index of 0.2 to 0.5 and a viscosity of 200 mPa•s (25° C., 50 rpm) or less which comprises (a) an autolyophobic vehicle which comprises an organic solvent having a vapor pressure of 0.2 mmHg (20° C.) or less and a dye, and (b) a coagulant, wherein said vehicle has a contact angle to the surface of said tip holder in the range of 5 to 40°.
Claim 6
Dependent Claim
85 words
A non-aqueous ink for a ball point pen having a tip holder, said ink having a non-Newtonian viscosity index of 0.2 to 0.5 and a viscosity of 200 mPa•s (25° C., 50 rpm) or less which comprises (a) an autolyophobic vehicle which comprises an organic solvent having a vapor pressure of 0.2 mmHg (20° C.) or less and a dye, and (b) a coagulant, wherein said vehicle has a contact angle to the surface of said tip holder in the range of 5 to 40°.
Claim 7
Dependent Claim
66 words
A non-aqueous ink for a ball point pen having a tip holder, said ink having a viscosity of 1000 mPa•s or less and comprising an autolyophobic vehicle which comprises 50 to 95% by weight of an organic solvent based upon 100% weight of total ink, wherein said vehicle has a contact angle to the surface of said tip holder in the range of 5 to 40°.
Claim 8
Dependent Claim
66 words
A non-aqueous ink for a ball point pen having a tip holder, said ink having a viscosity of 1000 mPa•s or less and comprising an autolyophobic vehicle which comprises 50 to 95% by weight of an organic solvent based upon 100% weight of total ink, wherein said vehicle has a contact angle to the surface of said tip holder in the range of 5 to 40°.
Claim 9
Dependent Claim
19 words
The non-aqueous ink for a ball point pen according to claim 4 which contains a solvent having autolyophobic properties.
Claim 10
Dependent Claim
24 words
The non-aqueous ink for a ball point pen according to claim 4 which contains a solvent having no autolyophobic properties and an oleophobic additive.
Claim 11
Dependent Claim
15 words
The non-aqueous ink of claim 2, wherein said autolyophobic vehicle further comprises an oleophobic additive.
Claim 12
Dependent Claim
15 words
The non-aqueous ink of claim 3, wherein said autolyophobic vehicle further comprises an oleophobic additive.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-20 | 2003-06-21 | 2003-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-20 | 2007-06-21 | 2007-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-20 | 2011-06-21 | 2011-12-21 | $7700.00 | Window Closed / Lapsed |