US5409794A
Expired / Lapsed
US
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Toner compositions with metal chelate charge enhancing additives
Assignee: Xerox Corp
•
Filing: 1992-10-21
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Granted: 1995-04-25
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Expires: 2012-10-21
Abstract
Abstract A toner composition comprised of polymers, pigment particles and/or dyes, optional surface additives, and a charge enhancing additive derived from the reaction of a metal, a metal carbonyl, a metal salt, or a metal oxide, with a β-diketone, a β-keto ester, or a malonic ester in an aqueous medium or organic medium.
Inventors
- 👤 Beng S. Ong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:30
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09783
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
27 words
A toner composition consisting of a polymer or polymers, a pigment, and a charge enhancing additive of the following formula ##STR3## wherein Ph represents a phenyl group.
Claim 2
Dependent Claim
27 words
A toner composition consisting of a polymer or polymers, a pigment, and a charge enhancing additive of the following formula ##STR3## wherein Ph represents a phenyl group.
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 0.5 to about 5 weight percent.
Claim 4
Dependent Claim
28 words
A toner composition in accordance with claim 1 wherein the toner's rate of charging is less than about 120 seconds as measured by the standard charge spectrograph method.
Claim 5
Dependent Claim
24 words
A toner composition in accordance with claim 1 with a negative triboelectric charge of from between about -10 to about -40 microcoulombs per gram.
Claim 6
Dependent Claim
18 words
A toner composition in accordance with claim 1 wherein the polymer or polymers are comprised of styrene polymers.
Claim 7
Dependent Claim
31 words
A toner composition in accordance with claim 1 wherein the pigment is carbon black, magnetites, or mixtures thereof, cyan, magenta, yellow, red, blue, green, brown dye or pigment, or mixtures thereof.
Claim 8
Dependent Claim
26 words
A toner composition in accordance with claim 6 wherein the charge additive is present in an amount of from about 0.5 to about 5 weight percent.
Claim 9
Dependent Claim
15 words
A developer dry composition comprised of the toner composition of claim 1 and carrier particles.
References Cited (Backward Citations)
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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) | 1998-04-24 | 1998-10-24 | 1999-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-24 | 2002-10-24 | 2003-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-24 | 2006-10-24 | 2007-04-25 | $7700.00 | Window Closed / Lapsed |