US4609603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for achieving consistent high quality images with magnetic developer composition
Assignee: Xerox Corp
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Filing: 1984-12-14
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Granted: 1986-09-02
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Expires: 2004-12-14
Abstract
Abstract A process for generating consistent high quality images for extended periods, consisting essentially of (1) providing a xerographic imaging, or printing apparatus; (2) adding thereto a stable two component developer composition comprised of resin particles, first pigment particles, second magnetite pigment particles, which are present in a greater amount than the first pigment particles, and blended flow additive particles; and carrier particles consisting of a ferrite core, or a steel core and a coating thereover selected from the group consisting of terpolymers of styrene, methacrylate, and triethoxysilane; and polymethacrylate, which coating has incorporated therein conductive particles; (3) forming electrostatic latent images, or magnetic images in the apparatus; and (4) developing the images formed, wherein the developer composition retains its electrical properties for over 2.5 million imaging cycles.
Inventors
- 👤 John F. Knapp
- 👤 Robert J. Gruber
- 👤 Lawrence Floyd, Jr.
- 👤 Steven B. Bolte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:31
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1139; G03G13/00; G03G13/06; G03G13/08; G03G13/09; G03G9/1132; G03G9/1133; G03G9/1135; G03G9/1136
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
127 words
A process for generating consistent high quality images for extended periods, consisting essentially of (1) providing a xerographic imaging, or printing apparatus; (2) adding thereto a stable two component developer composition comprised of resin particles, first pigment particles, second magnetite pigment particles, which are present in a greater amount than the first pigment particles, and blended flow additive particles; and carrier particles consisting of a ferrite core, or a steel core, and a coating thereover selected from the group consisting of terpolymers of styrene, methacrylate, and triethoxysilane; and polymethacrylate, which coating has incorporated therein conductive particles; (3) forming electrostatic latent images, or magnetic images in the apparatus; and (4) developing the images formed, wherein the developer composition retains its electrical properties for over 2.5 million imaging cycles.
Claim 2
Dependent Claim
127 words
A process for generating consistent high quality images for extended periods, consisting essentially of (1) providing a xerographic imaging, or printing apparatus; (2) adding thereto a stable two component developer composition comprised of resin particles, first pigment particles, second magnetite pigment particles, which are present in a greater amount than the first pigment particles, and blended flow additive particles; and carrier particles consisting of a ferrite core, or a steel core, and a coating thereover selected from the group consisting of terpolymers of styrene, methacrylate, and triethoxysilane; and polymethacrylate, which coating has incorporated therein conductive particles; (3) forming electrostatic latent images, or magnetic images in the apparatus; and (4) developing the images formed, wherein the developer composition retains its electrical properties for over 2.5 million imaging cycles.
Claim 3
Dependent Claim
19 words
A process in accordance with claim 1 wherein the toner resin particles are comprised of a styrene butadiene polymer.
Claim 4
Dependent Claim
27 words
A process in accordance with claim 1 wherein the first pigment particles are present in an amount of from about 1 to about 5 percent by weight.
Claim 5
Dependent Claim
27 words
A process in accordance with claim 1 wherein the second pigment particles are present in an amount of from about 15 to about 25 percent by weight.
Claim 6
Dependent Claim
17 words
A process in accordance with claim 1 wherein the first pigment particles are comprised of carbon black.
Claim 7
Dependent Claim
16 words
A process in accordance with claim 1 wherein the second pigment particles are comprised of magnetites.
Claim 8
Dependent Claim
16 words
A process in accordance with claim 1 wherein the additive particles are comprised of colloidal silicas.
Claim 9
Dependent Claim
40 words
A process in accordance with claim 1 wherein the carrier coating is comprised of a terpolymer of styrene, methacrylate and vinyltriethoxysilane, at a coating weight of from about 0.1 percent to about 3 percent, and conductive carbon black particles therein.
Claim 10
Dependent Claim
32 words
A process in accordance with claim 1 wherein the triboelectric charge on the toner composition remains substantially constant at 20 to 25 microcoulombs per gram, for 2.5 million imaging or printing cycles.
Claim 11
Dependent Claim
40 words
A printing or imaging method which comprises forming an image on a photoconductive member, contacting the image with the developer composition of claim 1, followed by transfering the image to a suitable substrate, and optionally permanently affixing the image thereto.
Claim 12
Dependent Claim
32 words
A method in accordance with claim 10 wherein the first pigment particles are carbon black present in an amount of from about 1 percent by weight to about 5 percent by weight.
Claim 13
Dependent Claim
29 words
A method in accordance with claim 10 wherein the second pigment particles are present in an amount from about 15 percent by weight to about 25 percent by weight.
Claim 14
Dependent Claim
18 words
A method in accordance with claim 10 wherein the resin particles are comprised of a styrene butadiene copolymer.
Claim 15
Dependent Claim
43 words
A method for developing images which comprises forming a magnetic latent image in a xerographic printing apparatus, contacting this image with the developer composition of claim 1 followed by transferring the image to a suitable substrate, and optionally permanently affixing the image thereto.
Claim 16
Dependent Claim
34 words
A method of imaging in accordance with claim 14 wherein the first pigment particles are carbon black present in an amount of from about 1 percent by weight to about 5 percent by weight.
Claim 17
Dependent Claim
30 words
A method in accordance with claim 14 wherein the second pigment particles are present in an amount of from about 15 percent by weight to about 25 percent by weight.
Claim 18
Dependent Claim
18 words
A method in accordance with claim 14 wherein the resin particles are comprised of a styrene butadiene copolymer.
Claim 19
Dependent Claim
16 words
A method in accordance with claim 10 wherein the additive particles are comprised of colloidal silicas.
Claim 20
Dependent Claim
16 words
A method in accordance with claim 14 wherein the additive particles are comprised of colloidal silicas.
Claim 21
Dependent Claim
14 words
A process in accordance with claim 1 wherein the conductive particles are carbon black.
Claim 22
Dependent Claim
29 words
A process in accordance with claim 20 wherein the carbon black is present in an amount of from about 15 percent by weight to about 30 percent by weight.
Claim 23
Dependent Claim
23 words
A process in accordance with claim 21 wherein the carbon black particles are present in an amount of about 20 percent by weight.
Claim 24
Dependent Claim
26 words
A process in accordance with claim 7 wherein the colloidal silica is present in an amount of from about 0.1 to about 1 percent by weight.
Claim 25
Dependent Claim
31 words
A process in accordance with claim 1 wherein the second magnetite pigment particles are present in an amount of from about 15 percent by weight to about 20 percent by weight.
Claim 26
Dependent Claim
157 words
A process for generating consistent high quality images for extended periods consisting essentially of (1) providing a xerographic imaging or printing apparatus; (2) adding thereto a stable two component developer composition comprised of styrene butadiene resin particles, first pigment particles present in an amount of from about 1 to about 5 percent by weight, second magnetite pigment particles present in an amount of from about 15 to about 25 percent by weight, and blended flow additive particles; and carrier particles consisting of a ferrite core or a steel core with a coating thereover selected from the group consisting of terpolymers of styrene, methacrylate, and triethoxy silane, and polymethacrylate, which coating has incorporated therein conductive particles; (3) forming electrostatic latent images, or magnetic images in the xerographic printing or xerographic imaging apparatus; and (4) developing the images formed by contact thereof with the aforementioned developer composition, which composition retains its electrical property for over 2.5 million imaging cycles.
Claim 27
Dependent Claim
157 words
A process for generating consistent high quality images for extended periods consisting essentially of (1) providing a xerographic imaging or printing apparatus; (2) adding thereto a stable two component developer composition comprised of styrene butadiene resin particles, first pigment particles present in an amount of from about 1 to about 5 percent by weight, second magnetite pigment particles present in an amount of from about 15 to about 25 percent by weight, and blended flow additive particles; and carrier particles consisting of a ferrite core or a steel core with a coating thereover selected from the group consisting of terpolymers of styrene, methacrylate, and triethoxy silane, and polymethacrylate, which coating has incorporated therein conductive particles; (3) forming electrostatic latent images, or magnetic images in the xerographic printing or xerographic imaging apparatus; and (4) developing the images formed by contact thereof with the aforementioned developer composition, which composition retains its electrical property for over 2.5 million imaging cycles.
Claim 28
Dependent Claim
31 words
A process in accordance with claim 25 wherein the second magnetite pigment particles are present in an amount of from about 15 percent by weight to about 20 percent by weight.
Claim 29
Dependent Claim
16 words
A process in accordance with claim 25 wherein the additive particles are comprised of colloidal silicas.
Claim 30
Dependent Claim
14 words
A process in accordance with claim 25 wherein the conductive particles are carbon black.
Claim 31
Dependent Claim
26 words
A process in accordance with claim 25 wherein the colloidal silicas are present in an amount of from about 0.1 to about 1 percent by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |