Patent JPS526666B2 successfully refreshed from Google Patents.
US4837101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negatively charged colored toner compositions
Assignee: Xerox Corp
•
Filing: 1988-02-01
•
Granted: 1989-06-06
•
Expires: 2008-02-01
Abstract
Abstract A negatively charged developer composition comprised of a toner composition with an average particle diameter of from about 4 to about 9 microns containing a mixture of styrene butadiene copolymers, and styrene methacrylate copolymers; pigment particles selected from the group consisting of cyan, magenta, yellow, red, blue, green, brown, and mixtures thereof; first external additive particles of colloidal silica; second external additive particles of fatty acid metal salts; and carrier particles comprised of a ferrite core with a polymeric coating thereover, which coating has dispersed therein conductive particles.
Inventors
- 👤 Robert J. Gruber
- 👤 John F. Knapp
- 👤 Ronald J. Koch
- 👤 Lawrence Floyd, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:29
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0819; G03G9/09; G03G9/097; G03G9/10; G03G9/113; G03G9/1139
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
87 words
A negatively charged developer composition comprised of a toner composition with an average particle diameter of from 4 to 9 microns consisting essentially of a mixture of styrene butadienes, and styrene methacrylates; pigment particles selected from the group consisting of cyan, magenta, yellow, red, blue, green, brown, and mixtures thereof; first external additive particles of colloidal silica; second external additive particles of fatty acid metal salts; and carrier particles consisting essentially of a ferrite core with a polymeric coating thereover, which coating has dispersed therein conductive particles.
Claim 2
Dependent Claim
87 words
A negatively charged developer composition comprised of a toner composition with an average particle diameter of from 4 to 9 microns consisting essentially of a mixture of styrene butadienes, and styrene methacrylates; pigment particles selected from the group consisting of cyan, magenta, yellow, red, blue, green, brown, and mixtures thereof; first external additive particles of colloidal silica; second external additive particles of fatty acid metal salts; and carrier particles consisting essentially of a ferrite core with a polymeric coating thereover, which coating has dispersed therein conductive particles.
Claim 3
Dependent Claim
25 words
A composition in accordance with claim 1 wherein the mixture contains from about 10 to about 90 percent by weight of the styrene butadiene copolymer.
Claim 4
Dependent Claim
17 words
A composition in accordance with claim 1 wherein the second additive particles are comprised of zinc stearate.
Claim 5
Dependent Claim
13 words
A composition in accordance with claim 1 wherein the colloidal silica is Aerosil.
Claim 6
Dependent Claim
27 words
A composition in accordance with claim 1 wherein the first additive particles are present in an amount of from about 0.1 to about 2 percent by weight.
Claim 7
Dependent Claim
27 words
A composition in accordance with claim 1 wherein the second additive particles are present in an amount of from about 0.1 to about 2 percent by weight.
Claim 8
Dependent Claim
17 words
A composition in accordance with claim 1 wherein the carrier core consists of zinc, iron, and copper.
Claim 9
Dependent Claim
32 words
A composition in accordance with claim 1 wherein the carrier coating polymer is selected from the group consisting of polymethacrylates, and terpolymers of styrene, methacrylate, and an organo triethoxy silane; and fluoropolymers.
Claim 10
Dependent Claim
16 words
A composition in accordance with claim 1 wherein the conductive particles are comprised of carbon black.
Claim 11
Dependent Claim
24 words
A composition in accordance with claim 1 wherein the triboelectric charge on the torner is from about -20 to about -35 microcoulombs per gram.
Claim 12
Dependent Claim
28 words
A composition in accordance with claim 1 wherein the triboelectric charge on the toner is from about -20 to about -25 microcoulombs per gram for 200,000 imaging cycles.
Claim 13
Dependent Claim
20 words
A composition in accordance with claim 1 wherein the admix charging time is from about 5 to about 60 seconds.
Claim 14
Dependent Claim
26 words
A composition in accordance with claim 1 wherein the pigment particles are present in an amount of from about 1 to about 15 percent by weight.
Claim 15
Dependent Claim
44 words
A method for developing images which comprises the generation of an electrostatic latent image on an imaging member, contacting the image formed with the developer composition of claim 1, thereafter transferring the developed image to a suitable substrate, and subsequently affixing the image thereto.
Claim 16
Dependent Claim
22 words
A method of imaging in accordance with claim 14 wherein the developer composition selected retains its electrical characteristics for 200,000 imaging cycles.
Claim 17
Dependent Claim
30 words
A method of imaging in accordance with claim 14 wherein the triboelectric charge on the toner is from about -20 to about -30 microcoulombs per gram for 200,000 imaging cycles.
Claim 18
Dependent Claim
101 words
A negatively charged developer composition comprised of a toner composition with an average particle diameter of from 4 to 9 microns consisting essentially of a mixture of styrene butadienes, and styrene methacrylates; pigment particles selected form the group consisting of cyan, magenta, yellow, red, blue, green, brown, and mixtures thereof; first external additive particles of colloidal silica; second external additive particles of fatty acid metal salts; and carrier particles consisting essentially of a ferrite core with a polymeric coating thereover, which coating has dispersed therein conductive particles; subject to the provision that the resin particles comprise at least one styrene polymer.
Claim 19
Dependent Claim
101 words
A negatively charged developer composition comprised of a toner composition with an average particle diameter of from 4 to 9 microns consisting essentially of a mixture of styrene butadienes, and styrene methacrylates; pigment particles selected form the group consisting of cyan, magenta, yellow, red, blue, green, brown, and mixtures thereof; first external additive particles of colloidal silica; second external additive particles of fatty acid metal salts; and carrier particles consisting essentially of a ferrite core with a polymeric coating thereover, which coating has dispersed therein conductive particles; subject to the provision that the resin particles comprise at least one styrene polymer.
Claim 20
Dependent Claim
14 words
A composition in accordance with claim 17 wherein the styrene polymer is styrene butadiene.
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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |