US3985663A
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Conductive inks containing quaternary ammonium compounds
Assignee: Xerox Corp
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Filing: 1974-03-14
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Granted: 1976-10-12
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Expires: 1994-03-14
Abstract
Abstract A method and ink composition for development of an electrostatic latent image with liquid developer is disclosed. The liquid developer has a viscosity suitable for convenient application to an imaged surface in the development of latent electrostatic images and has improved conductivity resulting from incorporating conductivity control agents in the form of quaternary ammonium compounds which are soluble in the carrier of the ink composition. The conductive ink composition comprises a coloring agent, optionally a binder and a dispersing agent, a carrier and a quaternary ammonium compound soluble in the liquid carrier.
Inventors
- 👤 Chin H. Lu
- 👤 Richard A. Parent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:40
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; G03G9/1355
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
68 words
A conductive ink comprising a coloring agent, a liquid carrier and a quaternary ammonium compound soluble in said carrier, said quaternary ammonium compound having the formula: ##EQU1## in which at least one R is a hydrocarbon having from about 1 to about 18 carbon atoms and each other R is a hydrogen or a hydrocarbon having from 1 to about 18 carbon atoms and A is an anion.
Claim 2
Dependent Claim
68 words
A conductive ink comprising a coloring agent, a liquid carrier and a quaternary ammonium compound soluble in said carrier, said quaternary ammonium compound having the formula: ##EQU1## in which at least one R is a hydrocarbon having from about 1 to about 18 carbon atoms and each other R is a hydrogen or a hydrocarbon having from 1 to about 18 carbon atoms and A is an anion.
Claim 3
Dependent Claim
17 words
The ink of claim 1 wherein less than about 1.0 weight percent thereof is quaternary ammonium compound.
Claim 4
Dependent Claim
18 words
The ink of claim 1 wherein about 0.05 to about 0.5 weight percent thereof is quaternary ammonium compound.
Claim 5
Dependent Claim
13 words
The ink of claim 1 further comprising a dispersing agent and a binder.
Claim 6
Dependent Claim
27 words
The ink of claim 1 wherein the quaternary ammonium compound is selected from the group consisting of tetraheptyl ammonium bromide, tetrabutyl ammonium iodide, and tetrabutyl ammonium bromide.
Claim 7
Dependent Claim
30 words
The ink of claim 1 wherein the resistivity is less than about 10 9 ohm-centimeters at 25° C and the viscosity is less than about 1,000 centipoises at 25° C.
Claim 8
Dependent Claim
18 words
The ink of claim 1 wherein the coloring agent is about 0.1 to about 30 weight percent thereof.
Claim 9
Dependent Claim
17 words
The ink of claim 4 wherein the binder is about 5 to about 25 weight percent thereof.
Claim 10
Dependent Claim
18 words
The ink of claim 4 wherein the dispersing agent is about 1 to about 10 weight percent thereof.
Claim 11
Dependent Claim
14 words
The ink of claim 4 further comprising up to about 40 weight percent plasticizer.
Claim 12
Dependent Claim
167 words
A conductive ink for visual development of a latent electrostatic image on a surface, said ink having a resistivity at 25° C of less than about 10 9 ohm-centimeters and a viscosity of about 50 to about 1,000 centipoises at 25° C and comprising about 0.1 to about 30 weight percent of a coloring agent capable of yielding color copies when attracted to a latent image; about 0.05 to less than about 1.0 weight percent of a quaternary ammonium compound; about 5 to about 25 weight percent of a binder; about 1 to about 10 weight percent of a dispersing agent for said coloring agent; and the balance carrier, said quaternary ammonium compound being soluble in said carrier, said quaternary ammonium compound having the formula: ##STR2## in which at least one R is a hydrocarbon having from about 1 to about 18 carbon atoms and each other R is a hydrogen or a hydrocarbon having from 1 to about 18 carbon atoms and A is an anion.
Claim 13
Dependent Claim
167 words
A conductive ink for visual development of a latent electrostatic image on a surface, said ink having a resistivity at 25° C of less than about 10 9 ohm-centimeters and a viscosity of about 50 to about 1,000 centipoises at 25° C and comprising about 0.1 to about 30 weight percent of a coloring agent capable of yielding color copies when attracted to a latent image; about 0.05 to less than about 1.0 weight percent of a quaternary ammonium compound; about 5 to about 25 weight percent of a binder; about 1 to about 10 weight percent of a dispersing agent for said coloring agent; and the balance carrier, said quaternary ammonium compound being soluble in said carrier, said quaternary ammonium compound having the formula: ##STR2## in which at least one R is a hydrocarbon having from about 1 to about 18 carbon atoms and each other R is a hydrogen or a hydrocarbon having from 1 to about 18 carbon atoms and A is an anion.
Claim 14
Dependent Claim
17 words
The ink of claim 11 wherein the carrier is about 25 to about 94.0 weight percent thereof.
Claim 15
Dependent Claim
10 words
The ink of claim 11 wherein the carrier is butoxytriglycol.
Claim 16
Dependent Claim
11 words
The ink of claim 11 wherein the carrier is dibutyl phthalate.
Claim 17
Dependent Claim
31 words
The ink of claim 11 wherein the quaternary ammonium compound soluble in said carrier is selected from the group consisting of tetraheptyl ammonium bromide, tetrabutyl ammonium iodide and tetrabutyl ammonium bromide.
Claim 18
Independent Claim
88 words
A method of increasing the conductivity of an ink having a coloring agent, a carrier and optionally a binder and a dispersing agent, comprising incorporating therein less than about 1.0 weight percent quaternary ammonium compound soluble in said carrier, said quaternary ammonium compound having the formula: ##STR3## in which at least one R is a hydrocarbon having from about 1 to about 18 carbon atoms and each other R is a hydrogen or a hydrocarbon having from 1 to about 18 carbon atoms and A is an anion.
Claim 19
Independent Claim
88 words
A method of increasing the conductivity of an ink having a coloring agent, a carrier and optionally a binder and a dispersing agent, comprising incorporating therein less than about 1.0 weight percent quaternary ammonium compound soluble in said carrier, said quaternary ammonium compound having the formula: ##STR3## in which at least one R is a hydrocarbon having from about 1 to about 18 carbon atoms and each other R is a hydrogen or a hydrocarbon having from 1 to about 18 carbon atoms and A is an anion.
Claim 20
Dependent Claim
25 words
The method of claim 16 wherein about 0.05 to about 0.5 weight percent of quaternary ammonium compound is added to the ink of claim 16.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |