US4804601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic and electrographic imaging processes
Assignee: Xerox Corp
•
Filing: 1987-06-29
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Granted: 1989-02-14
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Expires: 2007-06-29
Abstract
Abstract An imaging process which comprises the formation of an image on an imaging member; subsequently developing the aforementioned image with an electrophoretic liquid developer composition comprised of an insulating suspending fluid with a resistivity of from about 10 12 ohm-cm to about 10 16 ohm-cm, pigment particles, a stabilizer component, and a charge control additive; and wherein the resulting ink has a resistivity of from about 10 9 to about 10 12 ohm-cm; applying the ink composition from an applicator roll, which roll transports the ink to the imaging member surface; and wherein the ink is attracted to the charged areas of the imaging member.
Inventors
- 👤 P. Keith Watson
- 👤 Henry R. Till
- 👤 Melvin D. Croucher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:32
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/10; G03G9/00; G03G9/08; G03G9/12
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
106 words
An imaging process which comprises the formation of an image on an imaging member; subsquently developing the aforementioned image with an electrophoretic liquid developer composition comprised of an insulating suspending fluid with a resistivity of from about 10 12 ohm-cm to about 10 16 ohm-cm, pigment particles, a stabilizer component, and a charge control additive; and wherein the resulting ink has a resistivity of from about 10 9 to about 10 12 ohm-cm; applying the ink composition from an applicator roll, which roll transports the ink to the imaging member surface; and wherein the ink is selectively attracted to the charged areas of the imaging member.
Claim 2
Dependent Claim
106 words
An imaging process which comprises the formation of an image on an imaging member; subsquently developing the aforementioned image with an electrophoretic liquid developer composition comprised of an insulating suspending fluid with a resistivity of from about 10 12 ohm-cm to about 10 16 ohm-cm, pigment particles, a stabilizer component, and a charge control additive; and wherein the resulting ink has a resistivity of from about 10 9 to about 10 12 ohm-cm; applying the ink composition from an applicator roll, which roll transports the ink to the imaging member surface; and wherein the ink is selectively attracted to the charged areas of the imaging member.
Claim 3
Dependent Claim
22 words
A process in accordance with claim 1 wherein the electrophoretic ink has a dielectric relaxation time less than the development process time.
Claim 4
Dependent Claim
28 words
A process in accordance with claim 1 wherein the electrophoretic suspending fluid, in the absence of pigment particles, has a dielectric relaxation time greater than the exposure-to-development time.
Claim 5
Dependent Claim
14 words
A process in accordance with claim 1 wherein the applicator is a gravure roll.
Claim 6
Dependent Claim
20 words
A process in accordance with claim 1 wherein the applicator rotates in synchronism with the surface of the imaging member.
Claim 7
Dependent Claim
26 words
A process in accordance with claim 1 wherein the insulating fluid is a nonvolatile fluid which dries by absorption into the paper thereby minimizing fluid odor.
Claim 8
Dependent Claim
16 words
A process in accordance with claim 1 wherein the insulating fluid is comprised of Magiesol 60.
Claim 9
Dependent Claim
25 words
A process in accordance with claim 1 wherein the insulating fluid has a vapor pressure of from about 0.0002 to about 0.02 millimeters of mercury.
Claim 10
Dependent Claim
14 words
A process in accordance with claim 1 wherein the pigment particles are carbon black.
Claim 11
Dependent Claim
18 words
A process in accordance with claim 1 wherein the pigment particles are cyan, magenta, yellow, or mixtures thereof.
Claim 12
Dependent Claim
17 words
A process in accordance with claim 1 wherein the stabilizer is a poly(styrene hydrogenated butadiene) block copolymer.
Claim 13
Dependent Claim
13 words
A process in accordance with claim 1 wherein the stabilizer is poly(isobutylene-co-isoprene) copolymer.
Claim 14
Dependent Claim
12 words
A process in accordance with claim 1 wherein the stabilizer is polyisobutylene.
Claim 15
Dependent Claim
25 words
A process in accordance with claim 1 wherein the insulating vehicle has a vapor pressure of not more than 0.1 millimeter mercury at 25° C.
Claim 16
Dependent Claim
27 words
A process in accordance with claim 1 wherein the charge control agents are present in an amount of from about 0.5 to about 5 percent by weight.
Claim 17
Dependent Claim
27 words
A process in accordance with claim 1 wherein the charge control additive is selected from the group consisting of zirconium octoate, iron naphthenate, lecithin, and polyisobutylene succinimide.
Claim 18
Dependent Claim
15 words
A process in accordance with claim 1 wherein the imaging member is a photoconductive material.
Claim 19
Dependent Claim
15 words
A process in accordance with claim 1 wherein there is selected an insulating imaging member.
Claim 20
Dependent Claim
18 words
A process in accordance with claim 1 wherein an electrostatic latent image is formed on the imaging member.
Claim 21
Dependent Claim
24 words
A process in accordance with claim 1 wherein the resistivity of the ink composition is from about 10 10 to about 10 11 ohm-cm.
Claim 22
Dependent Claim
39 words
A process in accordance with claim 1 wherein the electrophoretic suspending fluid has a dielectric relaxation time greater than the exposure-to-development time after removal of the pigment particles, and subsequent to transfer of the ink and the cleaning thereof.
Claim 23
Dependent Claim
30 words
A process in accordance with claim 1 wherein the insulating suspending fluid is present in an amount of from about 80 percent by weight to about 98 percent by weight.
Claim 24
Dependent Claim
29 words
A process in accordance with claim 1 wherein the pigment particles are present in an amount of from about 0.5 percent by weight to about 5 percent by weight.
Claim 25
Dependent Claim
28 words
A process in accordance with claim 1 wherein the stabilizer is present in an amount of from about 1 percent by weight to about 8 percent by weight.
Claim 26
Dependent Claim
26 words
A process in accordance with claim 1 wherein the transfer efficiency of the ink from the imaging member to the developed image exceeds about 75 percent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |