US5166029A
Expired / Lapsed
US
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Toner and developer compositions with charge enhancing additives
Assignee: Xerox Corp
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Filing: 1991-10-15
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Granted: 1992-11-24
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Expires: 2011-10-15
Abstract
Abstract A toner composition comprised of resin particles, pigment particles, and a charge enhancing additive as represented by the following formula ##STR1## wherein R 1 and R 2 are independently selected from the group consisting of alkyl, and R 3 is an aromatic group, and m represents the number of repeating segments.
Inventors
- 👤 Robert D. Bayley
- 👤 Thomas R. Hoffend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:36
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09741; G03G9/0975
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
31 words
A positively charged toner composition comprised of resin particles, pigment particles, and a charge enhancing additive as represented by the following formula ##STR4## wherein m is zero, 1, 2 or 3.
Claim 2
Dependent Claim
31 words
A positively charged toner composition comprised of resin particles, pigment particles, and a charge enhancing additive as represented by the following formula ##STR4## wherein m is zero, 1, 2 or 3.
Claim 3
Dependent Claim
26 words
A toner composition in accordance with claim 1 wherein the charge additive is present in an amount of from about 0.05 to about 5 weight percent.
Claim 4
Dependent Claim
26 words
A toner composition in accordance with claim 1 wherein the charge additive is present in an amount of from about 0.1 to about 3 weight percent.
Claim 5
Dependent Claim
17 words
A toner composition in accordance with claim 1 wherein the charge additive is incorporated into the toner.
Claim 6
Dependent Claim
21 words
A toner composition in accordance with claim 1 wherein the charge additive is present on the surface of the toner composition.
Claim 7
Dependent Claim
18 words
A toner composition in accordance with claim 5 wherein the charge additive is contained on colloidal silica particles.
Claim 8
Dependent Claim
20 words
A toner composition in accordance with claim 1 with an admix time of from between about 15 and 30 seconds.
Claim 9
Dependent Claim
20 words
A toner composition in accordance with claim 1 with an admix time of from about 1 to about 14 seconds.
Claim 10
Dependent Claim
22 words
A toner composition in accordance with claim 1 with a triboelectric charge of from about 10 to about 40 microcoulombs per gram.
Claim 11
Dependent Claim
31 words
A toner composition in accordance with claim 1 wherein a colloidal silica is treated with the charge enhancing additive, and the resulting composition is present on the surface of the toner.
Claim 12
Dependent Claim
25 words
A toner composition in accordance with claim 1 wherein the resin particles are selected from the group consisting of styrene polymers, polyesters, and mixtures thereof.
Claim 13
Dependent Claim
27 words
A toner composition in accordance with claim 1 wherein the resin particles are selected from the group consisting of styrene acrylates, styrene methacrylates, polyesters, and styrene butadienes.
Claim 14
Dependent Claim
25 words
A toner composition in accordance with claim 1 containing a wax component with a weight average molecular weight of from about 500 to about 7,000.
Claim 15
Dependent Claim
24 words
A toner composition in accordance with claim 13 wherein the wax component is selected from the group consisting of polyethylene, polypropylene and mixtures thereof.
Claim 16
Dependent Claim
28 words
A toner composition in accordance with claim 1 containing external additives selected from the group consisting of metal salts of a fatty acid, colloidal silicas, and mixtures thereof.
Claim 17
Dependent Claim
29 words
A toner composition in accordance with claim 1 wherein the pigment particles are carbon black, magnetites, or mixtures thereof, cyan, magenta, yellow, red, blue, green, brown, and mixtures thereof.
Claim 18
Dependent Claim
14 words
A developer composition comprised of the toner composition of claim 1 and carrier particles.
Claim 19
Dependent Claim
19 words
A developer composition in accordance with claim 17 wherein the carrier particles are ferrites, steel, or an iron powder.
Claim 20
Dependent Claim
22 words
A developer composition in accordance with claim 17 wherein the carrier particles are comprised of a core with a polymer coating thereover.
Claim 21
Dependent Claim
40 words
A developer composition in accordance with claim 19 wherein the coating is selected from the group consisting of a methyl terpolymer, a polyvinylidine fluoride, a polymethyl methacrylate, and a mixture of polymers not in close proximity in the triboelectric series.
Claim 22
Dependent Claim
38 words
A method of imaging which comprises formulating an electrostatic latent image on a negatively charged photoconductive imaging member, affecting development thereof with the toner composition of claim 1, and thereafter transferring the developed image to a suitable substrate.
Claim 23
Dependent Claim
19 words
A method of imaging in accordance with claim 21 wherein the transferred image is permanently fixed to the substrate.
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) | 1995-11-24 | 1996-05-25 | 1996-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-24 | 2000-05-25 | 2000-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-24 | 2004-05-25 | 2004-11-24 | $7700.00 | Window Closed / Lapsed |